Cell membrane exam

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The maintenance of a constant internal environment within the organism is known as

Homeostasis

How does bulk transport across the plasma membrane occur?

occurs by phagocytosis and pinocytosis.

What happens when a cell loses water?

It shrinks

Which diagram best represents the fluid mosaic model of a cell membrane

^^

The membrane is permeable to

glucose, K+, Na+, water, iodine

One primary function of the cell membrane is

regulating the flow of materials into or out of the cell

The membrane is impermeable to

starch

Active transport

the movement of materials through a cell membrane using energy

Which molecule will most likely diffuse through a cell membrane?

water

What large molecules can not move throughout the cell?

1) starch 2) DNA 3) proteins 4) lipids 5) ions - atoms with a charge, either positive or negative.

What small molecules can move through the cell membrane?

1) water (H2O) 2) oxygen (O2) 3) carbon dioxide (CO2) 4) glucose (C6H12O6)

Which letter structure is responsible for the excretion of most cellular wastes? Carbon dioxide is considered a cellular waste. Excretion means "removal"

2nd outer layer on plant cell!

Which structure is responsible for the passage of materials in and out of a cell

A

Which substance may pass through a cell membrane by simple diffusion

Carbon dioxide and water

A selectively permeable lipid bilayer with proteins embedded within the bilayer is the

Cell membrane

Which structure is most directly responsible for maintaining homeostasis in all cells?

Cell membrane

What happens when a cell gains water?

It swells.

Which structure of the cell allows the passage of oxygen?

Second outer layer of plant cell!

If the concentration of water is equal on both sides of the membrane, water molecules are equal on both sides of the membrane

The cell is in homeostasis

Which is not true?

The cell membrane forms a barrier that keeps all substances that might harm the cell from entering.

When does water diffuse into cell?

When cells are surrounded by distilled water, pure water

When does water diffuse out of the cell?

When cells are surrounded by salt water

What colors will be seen?

When iodine and starch mix, a bluish/black color will be seen.

concetration gradient

a difference in the amount of a substance on one side of the membrane

The spontaneous movement of materials across the membrane from regions of higher concentration to regions of lower concentration until equilibrium is reached

diffusion

passive transport

the movement of substances across a cell membrane without the use of energy by the cell


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