Cell Transport / Homeostatsis

This diagram shows a red blood cell in a beaker that contains a solution with a higher salt concentration than that inside the red blood cell.

What will happen to the red blood cell in this environment?

• The size of the red blood cell will remain constant.

• The red blood cell will swell at first and then shrink.

• The red blood cell will swell from absorbing salt molecules.

• The red blood cell will shrink from losing water molecules.

Answer explanation

The red blood cell will shrink from losing water molecules.

Tags

NGSS.MS-LS1-2

A student noticed that the freshwater plant, Elodea, produced bubbles when placed in direct light. What could the student most likely conclude?

• Bubbles of carbon dioxide were produced as a result of photosynthesis.

• Bubbles of oxygen were produced as a result of photosynthesis.

• Bubbles of carbon dioxide were produced as a result of cellular respiration.

• Bubbles of oxygen were produced as a result of cellular respiration.

Answer explanation

Bubbles of oxygen were produced as a result of photosynthesis.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

A freshwater plant is placed in a container of saltwater. What will most likely happen to the cells of the plant?

• They will swell because water will move into them.

• They will swell because salt will move into them.

• They will shrink because water will move out of them.

• They will shrink because salt will move out of them.

Answer explanation

The cells of the freshwater plant will shrink because water will move out of them due to the higher salt concentration in the saltwater.

Tags

NGSS.MS-LS1-2

NGSS.MS-LS2-4

If energy is needed to move materials into or out of a cell, what is most likely occurring?

• active transport

• passive transport

• osmosis

• diffusion

Answer explanation

Active transport is the process that requires energy to move materials into or out of a cell, making it the most likely occurrence in this scenario.

Unit 2

Which statement describes the process of osmosis in an animal cell?

• sugar molecules move across the plasma membrane until the cell has enough energy to grow in size and divide.

• water molecules move across the plasma membrane until solute concentrations are equal on both sides of the membrane.

• ions move across the plasma membrane until the inside of the cell has a higher concentration of positive charges.

• enzymes move across the plasma membrane until the cell has completed metabolism.

Answer explanation

Osmosis in an animal cell involves water molecules moving across the plasma membrane until solute concentrations are equal on both sides of the membrane.

The structure of a Plasma Membrane has what 2 parts

• Made of Phospholipid Bilayer

• Glycerol

• 2 Layers of lipids + proteins + carbohydrates

• Fatty Acids

Answer explanation

The Plasma Membrane is made of a Phospholipid Bilayer and consists of 2 layers of lipids, proteins, and carbohydrates.

Match the following

• No energy required from the cell

• Passive Transport

• Net movement of particles from an area of high concentration to low

• Osmosis

• Continuous movement of molecules, BUT, no overall change

• Facilitated Diffusion

• Diffusion of water across a semipermeable membrane

• Diffusion

• Diffusion through transport proteins

• Dynamic Equilibrium

Match the following

• Soln w/ lower concentration of solutes than cytoplasm

• Hypotonic

• Soln w/ higher concentration of solutes than cytoplams

• Isotonic

• Soln. w/ same concentration of solutes as cytoplasm

• Hypertonic

Active Transport Requires: (3)

• Energy

• Against concentration gradient

• Exocytosis

• Molecular Transport - through transport proteins or pumps

Answer explanation

Active transport requires energy to move molecules against the concentration gradient through transport proteins or pumps.

2 parts of Active Transport

• Osmosis

• Endocytosis

• Exocytosis

• Isotonic

Answer explanation

Active transport involves the movement of molecules against the concentration gradient, requiring energy. Endocytosis and exocytosis are two forms of active transport where cells take in and release substances by engulfing or expelling them through vesicles.