NEW
Font size
WorksheetsLIFE102 Arthun ERS2 FA'24
Total questions: 24
Worksheet time: 10mins
________ is the movement of water across a membrane as it _________ salt.
Diffusion; moves away from
Diffusion; follows
Osmosis; moves away from
Osmosis; follows
_______, which breaks molecules down and has a -ΔG, and ________, which builds molecules and has a +ΔG, are reverse processes of each other.
Anabolism; catabolism
Catabolism; anabolism
Inhibition; respiration
Endergonic; exergonic
The formula for the exergonic reaction of cellular respiration is-
C6H12O6 + H2O = O2 + CO2
H2O + CO2 = C6H12O6 + O2
C6H12O6 + O2 = CO2 + H2O
O2 + H2O = C6H12O6 + CO2
As the final acceptor of electrons at the end of the ETC, ________ is _______
Oxygen; reduced
Oxygen; oxidized
Glucose; reduced
Glucose; oxidized
Which of the following best describes why “fluid-mosaic model" is used to describe cell membranes?
Phospholipids have hydrophobic tails and hydrophobic heads
Unsaturated fatty acid tails, cholesterol subunits, and embedded proteins prevent the membrane from being tightly packed
Some proteins are embedded inside the membrane (integrals), while other proteins are bound to the surface of the membrane (peripherals)
Non-polar, small molecules can pass through cellular membranes while polar molecules require a protein
Which of the following is false about enzymes?
Enzymes are biological catalysts
Enzymes are not part of the final products in a reaction
One individual enzyme can accelerate several different reactions
Substrates need to bind to the active site of an enzyme for the reaction to occur
In a redox reaction, the reactant that is oxidized _______ electrons, while the reactant that is reduced _______ electrons
Loses; loses
Gains; loses
Gains; gains
Loses; gains
Membranes Contain…
Just proteins
Phospholipids and proteins
Phospholipids, proteins, cholesterol and mitochondria
Phospholipids, proteins, and cholesterol
Which of the following statements are true regarding Cellular Transport
Active transport doesn’t require energy, passive transport requires energy
Active transport requires energy, passive transport doesn’t require energy
Active transport doesn’t require energy, passive transport doesn’t require energy
Active transport requires energy, passive transport requires energy
What is the main function of enzymes
They lower the activation energy of reactions
They increase the activation energy of reactions
They increase the amount of energy required for a reaction to occur
They transport ions around the cell
What is False about the electron transport chain?
Electrons are transferred via NADH or FADH2 to the electron transport chain
Can occur in the Mitochondria
Electrons are passed through a number of proteins to O2
Electron transport chain generates ATP directly
What molecules are produced in the Citric Acid Cycle and then used during electron transport in the mitochondria?
NADPH
NADH
FADH2
Both B & C
Both A & C
What is true about the Clavin cycle?
Forms sugar from CO2 using ATP and NADPH
Forms sugar from CO2 using NADH
Forms sugar from O2 using ATP and NADPH
Forms sugar from CO2 using ATP and NADH
Which molecules can freely diffuse across the membrane?
Large molecules
Ions
Small polar molecules
Nucleotides
An exergonic reaction (1) energy and has a (2) delta G, while endergonic reactions (3) energy and have a (4) delta G.
1. Releases 2. Positive 3. Requires 4. Negative
1. Releases 2. Negative 3. Requires 4. Positive
Requires 2. Negative 3. Releases 4. Positive
Requires 2. Positive 3. Releases 4. Positive
When the production of a molecule inhibits further production of this molecule, it is referred to as ____
Positive feedback
Excess feedback
Negative feedback
Stationary feedback
What is the difference between integral and peripheral proteins?
Integral proteins are located on the outside of the phospholipid bilayer whereas peripheral proteins are located inside the phospholipid bilayer
Integral proteins are only responsible for water molecules to pass through the phospholipid bilayer, peripheral proteins help ions pass through
Peripheral proteins are located on the outside of the phospholipid bilayer whereas integral proteins are located inside the phospholipid bilayer
Peripheral proteins allow for the transport of ions, integral proteins allow for the transport of water
What are the factors that affect enzyme activity?
Amount of electrons present
pH
Temperature
A & C
B & C
What is the role of NADH in Cellular respiration?
To help with the digestion of food
To carry electrons to the Electron Transport Chain
To carry electrons to the Citric Acid Cycle
To help with the body’s metabolism
During which stage of cellular respiration is the majority of ATP produced?
Glycolysis
Citric Acid Cycle
Electron Transport Chain
Chemiosmosis
What happens to the excited electrons after they leave Photosystem II?
They are added to NADP- to form NADPH
They join Oxygen to form H2O
They are used to directly power ATP synthase to form ATP
They power the movement of H+ across the membrane, up their concentration gradient
A human blood cell is placed in a hypertonic solution (high salt concentration compared to the cell). What do you expect to happen to the cell?
Water will rush into the cell, causing it to burst
Water will rush out of the cell, causing it to shrivel
Salt will rush into the cell, causing it to burst
Salt will rush out of the cell, causing it to shrivel.
What occurs when light strikes Chlorophyll?
Light transfers an electron to the pigment particle
Light photoexcites one of the pigment particle’s electrons
Light transfers ATP to the pigment particle
The pigment absorbs all green wavelengths and reflects the other visible light
Inhibitors that bind to the Active site of an enzyme are considered ________ while inhibitors that bind to the Allosteric site of an enzyme are considered _________
Activators; Substrates
Non-competitive; competitive
Substrates; Activators
Competitive; non-competitive
