Question 1

Which of the following statements best describes microtubules?

Accepted Answer

They are the cytoskeletal elements with the largest diameter and are organized from microtubule organizing centers (MTOC).

Question 2

A scientist is studying a protein that moves vesicles along cytoskeletal tracks in neurons. Which type of protein is she most likely investigating?

Accepted Answer

Motor proteins

Question 3

Which of the following is a function shared by both microtubules and microfilaments?

Accepted Answer

They both have polarity and the plus end favors addition of building blocks.

Question 4

During cell division, which cytoskeletal element forms the spindle apparatus that separates replicated chromosomes?

Accepted Answer

Microtubules

Question 5

A mutation in the gene encoding for kinesin would most directly affect which cellular process?

Accepted Answer

The transport of vesicles along microtubules

Question 6

Which of the following statements about microfilaments is correct?

Accepted Answer

They contribute to the division of the cytoplasm as components of the contractile ring.

Question 7

Which of the following best describes the synthesis of receptors on the cell membrane?

Accepted Answer

Their synthesis starts in the free ribosome and is completed in the ER-attached ribosome.

Question 8

A patient with a defect in actin polymerization would most likely have problems with which of the following?

Accepted Answer

Muscle contraction

Question 9

Which of the following is true regarding the dynamic instability of microtubules?

Accepted Answer

It refers to the ability of microtubules to grow at the plus end while shrinking at the minus end.

Question 10

Which of the following statements about motor proteins is correct?

Accepted Answer

They work with actin and microtubules to generate movement.

Question 11

A researcher is studying the trafficking of HIV particles inside host cells. Which protein interaction is most relevant to this process?

Accepted Answer

Motor proteins binding to Gag and causing a tug-of-war

Question 12

Which of the following is a property of receptors on the cell membrane?

Accepted Answer

They are integral membrane proteins involved in signal transduction.

Question 13

Which cytoskeletal element is the major component of centrioles?

Accepted Answer

Microtubules

Question 14

A drug that inhibits the function of the γ-tubulin ring complex (γ-TuRC) would most directly affect which process?

Accepted Answer

Initiation of microtubule assembly

Question 15

Which of the following best explains why microfilaments are important in the formation of microvilli?

Accepted Answer

They provide structural support to microvilli.

Question 16

Which of the following statements about the polarity of cytoskeletal elements is correct?

Accepted Answer

Both microtubules and microfilaments have polarity, with the plus end favoring addition of building blocks.

Question 17

A cell is unable to complete cytokinesis due to a defect in the contractile ring. Which cytoskeletal element is most likely affected?

Accepted Answer

Microfilaments

Question 18

Which of the following is a correct statement about the synthesis and trafficking of receptors on the cell membrane?

Accepted Answer

Their synthesis is completed in the ER-attached ribosome and they interact with coat proteins during vesicular transport.

Question 19

Which of the following best describes the role of tropomyosin in muscle contraction?

Accepted Answer

It blocks the binding site of myosin on actin filaments.

Question 20

A cell biologist observes that a certain protein is synthesized in the free ribosome and then completed in the ER-attached ribosome. This protein is most likely:

Accepted Answer

A receptor on the cell membrane

Guided Study: Cytoskeletal Elements, Motor Proteins, and Membrane Receptors

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