Membrane Transport Practice (Overall Review) - Kate Turner | Biblioteka

Instrukcije

Please do not start this until we discuss it in class. This will be graded on correctness and you should work independently (not with anyone else). If you have questions please reach out to me.

0.5

The molecule that is both hydrophobic and hydrophilic and makes up membranes is a ...

Steroid

Carbohydrate

Phospholipid

Starch

0.5

What other biomolecule is found in the membrane of cells that helps with membrane transport?

DNA

Proteins

Nucleotides

0.5

Which of the following requires energy to occur? Select all that apply.

0.5

This image is illustrating ...

0.25

Does this type of transport require energy?

Yes

No

0.5

This image is illustrating ...

0.25

Does this type of transport require energy?

Yes

No

Use the image below to answer the remainder of the questions.

Note:

CO₂ = small and non-polar

Salt = small and charged/polar

Starch = large and polar

Sucrose = large and polar

0.5

The inside of the cell is _______ for carbon dioxide in comparison to the outside.

Hypertonic

Hypotonic

Isotonic

0.5

If carbon dioxide can move through the membrane without a membrane protein, where would the carbon dioxide move?

Inside the cell

Outside the cell

The carbon dioxide would not move

0.5

This type of movement is known as ...

0.25

Would this movement require energy?

Yes

No

The carbon dioxide does not move across the membrane

0.5

Would all of the carbon dioxide move across the membrane?

Yes

No

The carbon dioxide does not move across the membrane

0.5

The outside of the cell is _____ for starch in comparison to the inside.

Hypertonic

Hypotonic

Isotonic

0.5

If starch is too large to move across the membrane without a channel protein, but one is present in the membrane, where would the starch move?

Inside the cell

Outside the cell

The starch would not move

0.25

Would this movement require energy?

Yes

No

The starch would not move

0.5

This type of movement is known as ...

0.5

The outside of the cell is ______ for salt in comparison to the inside.

Hypertonic

Hypotonic

Isotonic

0.5

Assume that salt cannot move across the membrane without a membrane protein and there is no membrane protein for salt present. Where would the salt move?

Inside the cell

Outside the cell

The salt would not move

0.5

Given the previous answer, what might move across the membrane?

Salt

Water

Nothing

0.5

Where would the molecule from the previous question move?

Inside the cell

Outside the cell

Nothing would move

0.5

What might happen to the shape of the cell given the previous answer?

It would swell

It would shrink

Nothing

0.5

Assume the following:
- Sucrose is too large/polar to move through the membrane
- There is no protein channel for sucrose
- There are protein channels for fructose and glucose
- there is sucrase (an enzyme that breaks down sucrose) inside of the cell
What would happen?
Take a minute to think about this answer (don't rush through it) - maybe you can draw this out to help.

The sucrose would not be able to cross the membrane and would not break down so nothing would happen

The sucrose would not be able to cross the membrane and would not break down so the sucrose wouldn't move but the water would move into the cell to dilute the sucrose

The enzyme sucrase would break down the sucrose into glucose and fructose. The high concentration of glucose and fructose inside the cell would then cause the glucose and fructose to move through facilitated diffusion out of the cell until they reach dynamic equilibrium

The enzyme sucrase would break down the sucrose into glucose and fructose. The high concentration of glucose and fructose inside the cell would then cause the glucose and fructose to move through facilitated diffusion inside of the cell until they reach dynamic equilibrium