Question 1

Which of the following cellular components is found in ALL cells, both prokaryotic and eukaryotic?

Accepted Answer

Ribosomes

Question 2

What feature distinguishes a eukaryotic cell from a prokaryotic cell?

Accepted Answer

Presence of a nucleus

Question 3

Which of the following is an advantage of compartmentalization in eukaryotic cells?

Accepted Answer

All of the above.

Question 4

Which cellular component catalyzes the formation of peptide bonds during protein synthesis?

Accepted Answer

Ribosomes

Question 5

Molecules move into and out of the nucleus through which structure?

Accepted Answer

Nuclear pores

Question 6

A high molecular weight protein is found in the nucleus. What can you infer about this protein?

Accepted Answer

It contains a nuclear localization signal (NLS).

Question 7

Where are most nuclear proteins synthesized before being imported into the nucleus?

Accepted Answer

Cytosol

Question 8

DNA polymerase is a large nuclear protein. Which of the following shows the correct path DNA polymerase will take from synthesis to its final destination?

Accepted Answer

Free ribosome $$\rightarrow$$ nucleus

Question 9

What differs in the synthesis of a secreted protein compared to that of a cytosolic protein?

Accepted Answer

All of the above

Question 10

Which statement most accurately describes what happens to proteins that lack an ER signal sequence?

Accepted Answer

They are released into the cytosol.

Question 11

Which of the following choices reflects the appropriate order of locations through which a protein destined for the plasma membrane travels?

Accepted Answer

ER $$\rightarrow$$ Golgi $$\rightarrow$$ plasma membrane

Question 12

Where would a protein that was tagged with mannose-6-phosphate localize in the cell?

Accepted Answer

Lysosome

Question 13

The protein fibronectin contains an ER signal sequence and no other sorting signal or tag. Where would you expect to find fibronectin?

Accepted Answer

Outside the cell

Question 14

Which of the following statements about lysosomes is NOT true?

Accepted Answer

They have proton pumps in their membranes that move protons out into the cytosol.

Question 15

Eukaryotic cells manufacture cytoskeletal proteins which help to maintain cell shapes and functions. What would you predict about these proteins?

Accepted Answer

They are manufactured on free ribosomes in the cytoplasm.

Question 16

Which of the following would enable you to identify the plus end of actin filaments?

Accepted Answer

Adding radiolabeled actin subunits to a mixture of actin filaments in which conditions are favorable for polymerization

Question 17

Which of the following molecular motors are associated with actin?

Accepted Answer

Myosins

Question 18

Which of the following would be affected if actin function were disrupted?

Accepted Answer

A, B, and C

Question 19

Would you expect to find motor proteins that move along intermediate filaments? Why or why not?

Accepted Answer

No, because intermediate filaments lack polarity.

Question 20

Which of the following is a characteristic common to cell walls of bacteria, fungi, and plant cells and the extracellular matrix (ECM) of animal cells?

Accepted Answer

They consist of a cross-linked network of long filaments embedded in a stiff surrounding material.

Question 21

Which statement is most accurate concerning how the molecular composition of a plant cell wall compares with the ECM of animal cells?

Accepted Answer

Plant cell wall fibers consist primarily of carbohydrates; ECM fibers are dominated by proteins.

The Cell: Structure, Function, and Diversity (Chapter 7 Study Notes)

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