Scenario 3: A lab technician is conducting an experiment to observe the effects of different solutions on red blood cells. The technician prepares three slides, each with a drop of blood mixed with a different solution. The observations are as follows: Imagine the scientist now needs to transport a very large protein molecule into the cell from an area of low concentration to an area of high concentration. What type of transport would be required for this process?

Active transport, because it requires energy to move the substance against its concentration gradient

Simple diffusion, because the protein is moving from a low concentration

Osmosis, because it is a passive process that doesn't require energy

Facilitated diffusion, because it uses a protein to help move the molecule.

Scenario 4: A student is conducting a lab experiment to study the enzyme catalase, which is found in living tissues like potatoes and breaks down hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). The student places a small piece of potato (containing the enzyme) into a beaker of hydrogen peroxide. She observes that the mixture begins to bubble vigorously as oxygen gas is released. After the reaction is complete, she finds that the potato piece is unchanged. In this experiment, what is the role of the enzyme catalase?

It is a biological catalyst, which speeds up the reaction without being used up

It is the substrate, which is a molecule that is changed by the reaction

It is a product, which is formed at the end of the reaction

It is an inhibitor, which slows down the reaction

Scenario 4: A student is conducting a lab experiment to study the enzyme catalase, which is found in living tissues like potatoes and breaks down hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). The student places a small piece of potato (containing the enzyme) into a beaker of hydrogen peroxide. She observes that the mixture begins to bubble vigorously as oxygen gas is released. After the reaction is complete, she finds that the potato piece is unchanged. How does the enzyme affect the reaction?

It lowers the activation energy and speeds up the reaction rate

It raises the activation energy and speeds up the reaction rate.

It lowers the activation energy and slows down the reaction rate.

It raises the activation energy and speeds up the reaction rate.

Scenario 4: A student is conducting a lab experiment to study the enzyme catalase, which is found in living tissues like potatoes and breaks down hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). The student places a small piece of potato (containing the enzyme) into a beaker of hydrogen peroxide. She observes that the mixture begins to bubble vigorously as oxygen gas is released. After the reaction is complete, she finds that the potato piece is unchanged. The active site of the catalase enzyme is a specific area where the reaction takes place. What will happen if the shape of this active site is changed?

The substrate will no longer be able to fit the enzyme active site, and the reaction will not happen or will be very slow

The enzyme will still be able to attach to the substrate active site and function normally

The enzyme will change into the product of the reaction

The enzyme will now be able to speed up many different reactions

Scenario 4: A student is conducting a lab experiment to study the enzyme catalase, which is found in living tissues like potatoes and breaks down hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). The student places a small piece of potato (containing the enzyme) into a beaker of hydrogen peroxide. She observes that the mixture begins to bubble vigorously as oxygen gas is released. After the reaction is complete, she finds that the potato piece is unchanged. The active site of the catalase enzyme is a specific area where the reaction takes place. In this reaction, the hydrogen peroxide (H2O2) is the substrate. What are the products of this reaction? (HINT: Read the Scenario!)

A new, larger molecule formed by joining the reactants

Scenario 2: The Peanut Butter and Jelly Sandwich: You are preparing a classic peanut butter and jelly sandwich for lunch and decide to examine its nutritional information to understand how its components will fuel your body's cells. You know that all food is made up of four major macromolecules: carbohydrates, lipids, proteins, and nucleic acids. You look at a generic nutrition label for a serving of the sandwich's main ingredients: whole wheat bread, peanut butter, and strawberry jelly. Based on the nutrition facts, which macromolecules are the most abundant in your sandwich, and what are their primary functions in your body?

Carbohydrates (quick energy) and Lipids (long-term energy storage)

Lipids (energy storage) and Proteins (tissue repair)

Proteins (tissue repair) and Nucleic Acids (genetic information)

Carbohydrates (quick energy) and Proteins (tissue repair)

Scenario 2: The Peanut Butter and Jelly Sandwich: You are preparing a classic peanut butter and jelly sandwich for lunch and decide to examine its nutritional information to understand how its components will fuel your body's cells. You know that all food is made up of four major macromolecules: carbohydrates, lipids, proteins, and nucleic acids. You look at a generic nutrition label for a serving of the sandwich's main ingredients: whole wheat bread, peanut butter, and strawberry jelly. The bread contains starch, which is a long chain of glucose molecules. This starch will be broken down by your body to be used for energy. Which of the following correctly identifies the monomer and polymer described in this example?

Monomer: Monosaccharide, Polymer: Polysaccharide

Monomer: Amino acid, Polymer: Polypeptide

Monomer: Fatty acid, Polymer: Lipid

Monomer: Nucleotide, Polymer: Nucleic Acid

Scenario 2: The Peanut Butter and Jelly Sandwich: You are preparing a classic peanut butter and jelly sandwich for lunch and decide to examine its nutritional information to understand how its components will fuel your body's cells. You know that all food is made up of four major macromolecules: carbohydrates, lipids, proteins, and nucleic acids. You look at a generic nutrition label for a serving of the sandwich's main ingredients: whole wheat bread, peanut butter, and strawberry jelly. In addition to their role in energy storage, lipids also play a crucial role in cellular processes. Which of the following best describes a key cellular function of lipids

They form the primary component of the cell membrane, controlling what enters and leaves the cell

They act as enzymes to speed up chemical reactions in the cell

They carry the genetic instructions for building the cell

They provide the immediate energy required for cellular respiration

Scenario 1: Adapting to the Cold - The Cell Membrane of a Georgia Pine Tree: A group of plant biologists is studying the cell membranes of Georgia pine trees to understand how these organisms survive the changing temperatures of the state's climate, from hot, humid summers to cold winters. They know that the cell membrane is a dynamic, fluid structure, often described by the fluid-mosaic model. This model explains how the membrane is composed of a phospholipid bilayer, with various proteins embedded within it and carbohydrates attached to its surface. The scientists are particularly interested in the role of cholesterol, a lipid that is crucial for maintaining the membrane's fluidity and stability at different temperatures. They hypothesize that the amount of cholesterol in the membrane changes seasonally, helping the cells adapt to the cold. Based on the scenario and the fluid-mosaic model, which of the following best describes the primary structural components of the cell membrane and their arrangement? Responses

A phospholipid bilayer with various proteins, carbohydrates, and cholesterol molecules embedded within or attached to it

A single layer of proteins with a carbohydrate coating on one side

A double layer of carbohydrates with integral proteins on the surface

A single layer of cholesterol molecules with phospholipids scattered throughout

Scenario 1: Adapting to the Cold - The Cell Membrane of a Georgia Pine Tree: A group of plant biologists is studying the cell membranes of Georgia pine trees to understand how these organisms survive the changing temperatures of the state's climate, from hot, humid summers to cold winters. They know that the cell membrane is a dynamic, fluid structure, often described by the fluid-mosaic model. This model explains how the membrane is composed of a phospholipid bilayer, with various proteins embedded within it and carbohydrates attached to its surface. The scientists are particularly interested in the role of cholesterol, a lipid that is crucial for maintaining the membrane's fluidity and stability at different temperatures. They hypothesize that the amount of cholesterol in the membrane changes seasonally, helping the cells adapt to the cold. The phospholipids in the cell membrane have a unique structure that makes the membrane selectively permeable. Which statement accurately describes the regions of a phospholipid and how they contribute to this property?

The hydrophilic "heads" are attracted to water and face both the internal and external environments of the cell, while the hydrophobic "tails" are repelled by water and form the nonpolar interior of the membrane

The hydrophilic "head" is repelled by water and faces the inside of the membrane, while the hydrophobic "tails" are attracted to water and face the cell's exterior

Both the "heads" and "tails" are hydrophilic and allow all substances to pass freely through the membrane

The hydrophobic "heads" form a barrier to water, while the hydrophilic "tails" allow water-soluble substances to pass through

Scenario 1: Adapting to the Cold - The Cell Membrane of a Georgia Pine Tree: A group of plant biologists is studying the cell membranes of Georgia pine trees to understand how these organisms survive the changing temperatures of the state's climate, from hot, humid summers to cold winters. They know that the cell membrane is a dynamic, fluid structure, often described by the fluid-mosaic model. This model explains how the membrane is composed of a phospholipid bilayer, with various proteins embedded within it and carbohydrates attached to its surface. The scientists are particularly interested in the role of cholesterol, a lipid that is crucial for maintaining the membrane's fluidity and stability at different temperatures. They hypothesize that the amount of cholesterol in the membrane changes seasonally, helping the cells adapt to the cold. The scenario mentions that proteins are a key component of the cell membrane. What is the most likely function of these proteins in the pine tree's cells?

To act as channels, pumps, and receptors that transport substances across the membrane and transmit signals

To store genetic information for the cell

To provide long-term energy storage for the cell

To give the cell its rigid structure and shape

Scenario 1: Adapting to the Cold - The Cell Membrane of a Georgia Pine Tree: A group of plant biologists is studying the cell membranes of Georgia pine trees to understand how these organisms survive the changing temperatures of the state's climate, from hot, humid summers to cold winters. They know that the cell membrane is a dynamic, fluid structure, often described by the fluid-mosaic model. This model explains how the membrane is composed of a phospholipid bilayer, with various proteins embedded within it and carbohydrates attached to its surface. The scientists are particularly interested in the role of cholesterol, a lipid that is crucial for maintaining the membrane's fluidity and stability at different temperatures. They hypothesize that the amount of cholesterol in the membrane changes seasonally, helping the cells adapt to the cold. Based on the scenario, a plant biologist hypothesizes that pine trees increase the amount of cholesterol in their cell membranes during the winter. What is the most likely reason for this change?

To prevent the membrane from becoming too rigid and brittle in the cold, maintaining its flexibility

To make the membrane more rigid and less fluid in the hot temperatures

To provide an energy source for the cell during the cold months

To help the membrane dissolve more substances in the colder water

Scenario 7: A Plant Cell's Journey A plant biologist is studying a single plant cell under a microscope. To understand how the cell membrane helps maintain homeostasis, the biologist places the cell in three different beakers, each containing a solution with a different concentration of solutes. The cell's membrane, which is selectively permeable, must regulate the movement of substances in and out of the cell to keep it in a healthy, stable state. Based on the fluid-mosaic model, how does the cell membrane use both passive and active transport to move substances, and what is the key difference between these two processes?

Passive transport moves substances across the membrane without energy, while active transport moves substances against a concentration gradient by using energy

Passive transport requires energy to move substances against a concentration gradient, while active transport does not require energy

Both passive and active transport require energy, but active transport moves substances down a concentration gradient

Passive transport is used for large molecules, while active transport is used for small ions

Scenario 7: A Plant Cell's Journey A plant biologist is studying a single plant cell under a microscope. To understand how the cell membrane helps maintain homeostasis, the biologist places the cell in three different beakers, each containing a solution with a different concentration of solutes. The cell's membrane, which is selectively permeable, must regulate the movement of substances in and out of the cell to keep it in a healthy, stable state. The plant cell is placed in a solution, and the biologist observes that the cell swells and becomes turgid. What type of solution was the cell placed in, and why did this occur?

A hypotonic solution; the concentration of solutes outside the cell was lower, causing water to move in

A hypertonic solution; the concentration of solutes outside the cell was higher, causing water to move out

A hypertonic solution; the concentration of water was higher inside the cell, causing it to swell

An isotonic solution; the concentration of solutes was equal, causing water to move in and out at the same rate

Scenario 7: A Plant Cell's Journey A plant biologist is studying a single plant cell under a microscope. To understand how the cell membrane helps maintain homeostasis, the biologist places the cell in three different beakers, each containing a solution with a different concentration of solutes. The cell's membrane, which is selectively permeable, must regulate the movement of substances in and out of the cell to keep it in a healthy, stable state. The plant cell needs to bring in a large protein molecule to repair a damaged enzyme. Which type of cellular transport would be best suited for moving this large molecule across the cell membrane?

Endocytosis, as it uses a vesicle to engulf the large molecule and bring it into the cell

Facilitated Diffusion, as it uses a protein channel to move the molecule down its concentration gradient

Osmosis, as it is the movement of a large molecule from a high to a low concentration

Exocytosis, as it would expel the large molecule from the cell

Scenario 7: A Plant Cell's Journey A plant biologist is studying a single plant cell under a microscope. To understand how the cell membrane helps maintain homeostasis, the biologist places the cell in three different beakers, each containing a solution with a different concentration of solutes. The cell's membrane, which is selectively permeable, must regulate the movement of substances in and out of the cell to keep it in a healthy, stable state. A plant cell uses a protein pump and ATP to transport potassium ions (K+) into the cell, even when the concentration of K+ is already higher inside the cell. What type of cell process is this and why is ATP required?

active transport, to go against the concentration gradient from lower concentration to higher concentration.

passive transport, to go with the concentration gradient from higher concentration to lower concentration

passive transport, to go against the concentration gradient from lower concentration to higher concentration

active transport, to go with the concentration gradient from higher concentration to lower concentration

Scenario 6: The Science Fair Enzyme Experiment: A student is conducting a science fair project to investigate how different environmental factors affect the rate of an enzyme-catalyzed reaction. The student chooses to study Amylase, a common enzyme found in human saliva that breaks down starch into simple sugars. The student sets up a series of experiments, measuring the rate at which amylase breaks down starch under varying conditions of temperature, pH, and substrate concentration. The student's data is compiled in the following graphs: Based on the provided graph of temperature and enzyme activity, what is the optimal temperature for amylase to function, and what happens to the enzyme's structure when the temperature rises significantly above this point?

The optimal temperature is the highest point on the curve, and the enzyme begins to denature, losing its specific shape and function

The optimal temperature is 0°C, and the enzyme's structure becomes more rigid

The optimal temperature is the lowest point on the curve, and the enzyme's activity increases indefinitely

The optimal temperature is the peak of the curve, and the enzyme's active site becomes more efficient

Scenario 6: The Science Fair Enzyme Experiment: A student is conducting a science fair project to investigate how different environmental factors affect the rate of an enzyme-catalyzed reaction. The student chooses to study Amylase, a common enzyme found in human saliva that breaks down starch into simple sugars. The student sets up a series of experiments, measuring the rate at which amylase breaks down starch under varying conditions of temperature, pH, and substrate concentration. The student's data is compiled in the following graphs: In a separate experiment, the student changes the pH of the solution. The graph shows that amylase works best at a pH of around 7. What would happen to the enzyme if the student placed it in a solution with a pH of 2 (highly acidic)?

The enzyme would undergo denaturation, losing its functional shape and becoming inactive

The enzyme's activity would increase as it becomes more stable in an acidic environment

The enzyme would begin to break down the starch at an even faster rate

The enzyme would maintain its optimal activity because pH does not affect enzyme function

Scenario 6: The Science Fair Enzyme Experiment: A student is conducting a science fair project to investigate how different environmental factors affect the rate of an enzyme-catalyzed reaction. The student chooses to study Amylase, a common enzyme found in human saliva that breaks down starch into simple sugars. The student sets up a series of experiments, measuring the rate at which amylase breaks down starch under varying conditions of temperature, pH, and substrate concentration. The student's data is compiled in the following graphs: Using the graph that shows substrate concentration, describe how the reaction rate changes as the substrate concentration increases, and explain what is happening at the point where the curve plateaus (levels out).

The reaction rate increases and then levels off; the enzyme's active sites have become saturated, and all of them are constantly working

The reaction rate increases indefinitely; the enzyme's active sites are continuously binding with new substrate

The reaction rate decreases; the enzyme's active sites are being blocked by excess substrate

The reaction rate stays the same; the enzyme is only affected by changes in temperature

Scenario 6: The Science Fair Enzyme Experiment: A student is conducting a science fair project to investigate how different environmental factors affect the rate of an enzyme-catalyzed reaction. The student chooses to study Amylase, a common enzyme found in human saliva that breaks down starch into simple sugars. The student sets up a series of experiments, measuring the rate at which amylase breaks down starch under varying conditions of temperature, pH, and substrate concentration. The student's data is compiled in the following graphs: Based on the information, if the student moved the amylase enzyme from a test tube at 37°C to a test tube at 4°C, what would be the short-term effect on the enzyme's activity, and why?

The activity would decrease, because the molecules have less kinetic energy, reducing the frequency of collisions with the substrate

The activity would decrease, because the cold temperature causes the enzyme to denature

The activity would increase, because the molecules have more kinetic energy to react

The activity would stop, because the enzyme's active site has been permanently altered

Scenario 5: Digesting a Georgia Peach: You are enjoying a delicious, ripe Georgia peach. As you chew and swallow, your body's digestive system begins the process of breaking down the large, complex molecules in the peach into smaller, usable nutrients. This breakdown is a chemical reaction that would normally take a very long time, but it happens quickly and efficiently thanks to enzymes. These specialized proteins act as biological catalysts, speeding up the chemical reactions without being used up in the process. Each enzyme has a specific shape with a unique active site, a special region where a specific reactant molecule, called a substrate, can fit. Just like a key fits into a lock, the substrate binds to the active site. Once bound, the enzyme helps transform the substrate into a new molecule called a product, which your body can then absorb and use. Based on the scenario, what is the primary function of an enzyme in the digestive process?

To serve as a biological catalyst that speeds up a chemical reaction without being used up.

To act as a biological reactant that is consumed during a chemical reaction

To provide the necessary energy for a chemical reaction to occur

To bind to an active site and become a new product

Scenario 5: Digesting a Georgia Peach: You are enjoying a delicious, ripe Georgia peach. As you chew and swallow, your body's digestive system begins the process of breaking down the large, complex molecules in the peach into smaller, usable nutrients. This breakdown is a chemical reaction that would normally take a very long time, but it happens quickly and efficiently thanks to enzymes. These specialized proteins act as biological catalysts, speeding up the chemical reactions without being used up in the process. Each enzyme has a specific shape with a unique active site, a special region where a specific reactant molecule, called a substrate, can fit. Just like a key fits into a lock, the substrate binds to the active site. Once bound, the enzyme helps transform the substrate into a new molecule called a product, which your body can then absorb and use. A specific digestive enzyme in your stomach breaks down proteins from a peach pit that was accidentally swallowed. Describe the roles of the substrate and the product in this reaction

The substrate is the protein, and the product is the smaller amino acid chain that results from the reaction

The substrate is the enzyme, and the product is the protein that is broken down

The substrate is the smaller amino acid chain, and the product is the large protein

The substrate is the enzyme's active site, and the product is the enzyme itself

Scenario 5: Digesting a Georgia Peach: You are enjoying a delicious, ripe Georgia peach. As you chew and swallow, your body's digestive system begins the process of breaking down the large, complex molecules in the peach into smaller, usable nutrients. This breakdown is a chemical reaction that would normally take a very long time, but it happens quickly and efficiently thanks to enzymes. These specialized proteins act as biological catalysts, speeding up the chemical reactions without being used up in the process. Each enzyme has a specific shape with a unique active site, a special region where a specific reactant molecule, called a substrate, can fit. Just like a key fits into a lock, the substrate binds to the active site. Once bound, the enzyme helps transform the substrate into a new molecule called a product, which your body can then absorb and use. In the process of digesting the peach, the sugar molecules are the reactants that bind to the digestive enzyme. Using the lock-and-key model, what would you call the sugar molecules in this reaction, and which part of the enzyme would they bind to?

They are the substrates that bind to the enzyme's active site

They are the products that bind to the enzyme's active site

They are the catalysts that bind to the enzyme's product

They are the enzymes that bind to the enzyme's substrate

Scenario 5: Digesting a Georgia Peach: You are enjoying a delicious, ripe Georgia peach. As you chew and swallow, your body's digestive system begins the process of breaking down the large, complex molecules in the peach into smaller, usable nutrients. This breakdown is a chemical reaction that would normally take a very long time, but it happens quickly and efficiently thanks to enzymes. These specialized proteins act as biological catalysts, speeding up the chemical reactions without being used up in the process. Each enzyme has a specific shape with a unique active site, a special region where a specific reactant molecule, called a substrate, can fit. Just like a key fits into a lock, the substrate binds to the active site. Once bound, the enzyme helps transform the substrate into a new molecule called a product, which your body can then absorb and use. How does the lock-and-key model explain the specificity of an enzyme-catalyzed reaction?

It illustrates that a specific substrate has a complementary shape that allows it to bind to the unique active site of a specific enzyme, much like a specific key fits a specific lock

It explains that any substrate can fit into any enzyme's active site, speeding up a wide variety of reactions

It shows that enzymes are consumed during a reaction, which makes them very specific

It demonstrates how a single enzyme can be used to catalyze many different reactions at the same time

Which of the following is correct about the given diagram and cell transport?

A, B, & C are passive transport and do not require energy, whereas D is active tranport and does require energy.

A, B, & C are active transport and require energy, whereas D is passive transport and does not require energy.

A, B, & C are passive transport and require energy, whereas D is active transport and does not require energy.

A, B, & C are active transport and do not require energy, whereas D is passive transport and does require energy.

Biology Unit 2A Test Review Fall 25

Authored by PAMELA CRAWFORD

Biology

10th Grade

NGSS covered

Used 11+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Identify the macromolecules

1. lipid 2. carbohydrate 3. protein 4. nucleic acid

1. lipid 2. nucleic acid 3. protein 4. carbohydrate

1. nucleic acid 2. carbohydrate 3. protein 4. lipid

1. lipid 2. protein 3. nucleic acid 4. carbohydrate

Next to each statement, click Active if it refers to active transport or Passive if it refers to passive transport.

Groups:

(a) Active Tranport

(b) Passive Transport

Moves particles from an area of higher concentration to an area of lower concentration

Requires energy

Used to transport water

Moves particles against the concentration gradient

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Type questioWhich form of active transport is being shown?n here including an

pinocytosis

exocytosis

endocytosis

osmosis

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which diagram best shows the end result of diffusion?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which is true about the cell membrane?

The heads are hydrophilic and the tails are hydrophobic.

It is composed of a phospholipid bilayer

It is selectively permeable

All of these are correct about the cell membrane.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Scenario 3:
A lab technician is conducting an experiment to observe the effects of different solutions on red blood cells. The technician prepares three slides, each with a drop of blood mixed with a different solution. The observations are as follows:
Based on the observations, what type of solution was used on Slide 1, and what process caused the cells to swell and burst?

A hypertonic solution; the cells lost water through osmosis

An isotonic solution; water moved in and out of the cells equally

A hypotonic solution; water moved into the cells through osmosis

A hypotonic solution; the cells actively pumped in excess water

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Scenario 3:
A lab technician is conducting an experiment to observe the effects of different solutions on red blood cells. The technician prepares three slides, each with a drop of blood mixed with a different solution. The observations are as follows:
The movement of water across the cell membrane, as described in the scenario, is a type of passive transport. Why is this process considered passive?

It requires the cell to use a protein pump

It moves molecules from an area of low concentration to an area of high concentration, up a concentration gradient, with the use of cellular energy.

It requires the cell to expend energy (ATP)

It moves molecules from an area of high concentration to an area of low concentration, down a concentration gradient, without the use of cellular energy

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