BIO Exam 2 Practice Questions

Which of the following is true of lysosomes?

A. They are released from the cis face of the Golgi.

B. Lysosomes may be used to break down “worn out” organelles.

C. Lysosomes contain enzymes that hydrolyze polymers.

D. All of the above are true of lysosomes.

E. Only B and C above are true of lysosomes.

E

Which of the following is not a function of the extracellular matrix (ECM)?

A. providing structural support between cells.

B. reinforcing structures within cells that allow mobile cells to move

C. It provides the "glue" that allows cells to adhere to one another and form higher order structures such as

organs.

D. All of the above are functions of the ECM.

E. None of the above are functions of the ECM.

B

Evert Gorter’s experiment with red blood cells demonstrated

A. that cell membranes were made of phospholipids.

B. that the nuclear envelope is a double lipid bilayer.

C. the fluid mosaic model of plasma membranes.

D. that plasma membranes are phospholipid bilayers.

E. None of the above.

D

Animal cells are growing in an incubator at 37°C. The cells are then placed into an incubator at 47°C. Which of

the following is most likely to happen?

A. Initially, the plasma membrane of the cells becomes more fluid.

B. Initially, the plasma membrane of the cells becomes less fluid.

C. The fluidity of the membrane will not be affected.

D. More information is needed.

A

Animal cells are growing in an incubator at 37°C. The cells are then placed into an incubator at 47°C. In

response to being heated, how will the cells likely respond?

A. By generating membrane phospholipids with shorter fatty acid chains.

B. By generating membrane phospholipids with longer fatty acid chains.

C. Neither A nor B will occur.

D. More information is needed.

B

Animal cells are growing in an incubator at 37°C. The cells are then placed into an incubator at 47°C. In

response to being heated, how will the cells likely respond?

A. By generating membrane phospholipids with fatty acid chains that have fewer unsaturations.

B. By generating membrane phospholipids with fatty acid chains that have more unsaturations.

C. Neither A nor B will occur.

D. More information is needed.

A

Refer to the figure above. What is likely true of the proteins labeled A (fibronectin) and C (integrin)?

A. Both are integral (transmembrane) proteins.

B. Both are peripheral membrane proteins.

C. Fibronectin is an integral (transmembrane) protein and integrin is a peripheral membrane protein.

D. Fibronectin is a peripheral membrane protein and integrin is an integral (transmembrane) protein.

E. More information is needed.

D

Refer to the figure above. Which labeled structure (A, B, C, or D) best represents a hydrophobic area of the

plasma membrane?

A. A

B. B

C. C

D. D

B

Which structure above (A, B, or C) best represents a secondary lysosome?

A. A

B. B

C. C

D. D

B

Refer to the figure above. If you repeated Dr. Gorter’s experiment, which of the following results would best

represent Dr. Gorter’s results?

A. A

B. B

C. C

D. D

E. E

C

Lipid bilayer membranes (LBMs) are more permeable to some types of molecules than others. Which option

below gives the correct order (from left to right) starting with of the types of molecules that LBMs are the least

permeable to and ending with the types of molecules that LBMs are the most permeable to?

A. ions, small polar molecules, non-polar molecules

B. small polar molecules, ions, non-polar molecules

C. small polar molecules, non-polar molecules, ions

D. non-polar molecules, small polar molecules, ions

A

Refer to the figure above. The results indicated by ‘A’ are an example of

A. Linear kinetics.

B. Saturation kinetics.

C. Neither A or B is true.

D. You cannot make a conclusion based on the data.

B

What do facilitated diffusion and active transport have in common?

A. Both require the use of transmembrane transport proteins and energy input from the cell.

B. Both require the use of transmembrane transport proteins but neither require energy input from the cell.

C. Channel proteins are used in both facilitated diffusion and active transport.

D. Carrier proteins are used in both facilitated diffusion and active transport.

E. A and D are both true.

D

Which of the following are found in all prokaryotic and eukaryotic cells?

A. plasma (cell) membrane

B. ribosomes

C. cell wall

D. All of the above

E. Only A and B are found in all prokaryotes and eukaryotes

E