Membrane Structure and Function Prequiz: Sample Questions



1. Which of these cannot pass directly through the phospholipids of the plasma membrane?

A. lipid soluble molecule
B. water
C. glucose
D. hydrogen ion




2. Structure A is:
3. Structure B is:
4. Structure C is:
5. Structure D is:
6. Structure E is:
7. Structure F is:


Choose from:
Glycoprotein Intracellular cytoskeleton
Cholesterol Polysaccharide
Phospholipid
Extracellular matrix
Membrane Protein



8. What is the function of structure E?
A. Transport across the plasma membrane
B. Stabilization of the phospholipids

C. Structural support of the cell
D. Detection of environmental change


9. What name is given to the process by which water crosses a selectively permeable membrane?
A. diffusion

B. facilitated transport

C. phagocytosis

D. pinocytosis

E. osmosis

10.

You know that this cell is in a(n) _____ solution because the cell _____.



A. hypertonic...lost water

B. hypertonic...gained water

C. isotonic...neither lost nor gained water

D. hypotonic...shrunk

E. hypotonic...swelled



11. You know that this cell is in a(n) _____ solution because it _____.



hypotonic ... is turgid

hypotonic ... lysed

hypertonic ... lysed

hypertonic solution ... lost water

hypertonic ... gained water


12. Structure A is a _____.



water molecule

phospholipid

transport protein

solvent

solute




13. Structure B is a _____.



A. water molecule

B. phospholipid

C. transport protein

D. solvent

E. solute

14


The largest percentage of molecules that make up the cell membrane are

A)

carbohydrates, nucleic acids, and proteins.

B)

carbohydrates, water, and nucleic acids.

C)

phospholipids, cholesterol, and proteins.

D)

nucleic acids, amino acids, and fatty acids.

E)

water, carbohydrates and cholesterol.

15


In the fluid mosaic model, the double layer (bilayer) of molecules found in the cell membrane is made up of

A)

cholesterol.

B)

phospholipids.

C)

carbohydrates.

D)

nucleic acids.

E)

proteins.

16


Although the basic structure of the plasma membrane is determined mainly by its __________ , the functions of the plasma membrane are determined mainly by its __________ .

A)

carbohydrates, lipids

B)

carbohydrates, proteins

C)

lipids, proteins

D)

nucleic acids, lipids

E)

proteins, lipids

17


Which molecules in the cell membrane are mostly glycoproteins?

A)

carrier molecules

B)

channel proteins

C)

marker molecules

D)

receptor molecules

E)

enzymes

18


Which of these conditions decreases the rate of diffusion?

A)

increased concentration gradient

B)

increased viscosity

C)

increased temperature

D)

decreased size of solute particles

E)

all of these

19


Which of these substances diffuse directly through the lipid bilayer of the cell membrane?

A)

glucose and amino acids

B)

Na+ and Cl-

C)

O2 and CO2

D)

whole cells

20


A 10% salt solution is __________ to distilled water.

A)

isosmotic

B)

hyperosmotic

C)

hyposmotic

21


You place blood cells in an unknown solution and observe them with a microscope; you notice that most of the cells have crenated. Therefore, you conclude that the unknown solution is

A)

isosmotic to the cells.

B)

hyperosmotic to the cells.

C)

isotonic to the cells.

D)

hypertonic to the cells.

E)

hypotonic to the cells.

22


Solution A has a greater osmotic pressure that solution B. Therefore, solution A contains __________ solutes and __________ water than solution B.

A)

fewer, less

B)

fewer, more

C)

more, less

D)

more, more

23


In question 22 above, if the containers for solution A and solution B are connected, with a selectively permeable membrane between them, water moves

A)

from solution A to solution B.

B)

from solution B to solution A.

C)

equally in both directions.