EMQ 13. Theme: The cytoskeleton in interphase and dividing cells
From the list below, identify the cytoskeletal element described in each of the lines listed.
A Actin, microfilaments
B Intermediate filaments
C Myosin
D Tubulin, microtubules
1. Are composed of equal amounts of an α and a β isoform.
Your Answer:
Your Answer:
Answer: D, microtubules. See book page 283.
2. Because the monomers remain connected as strong filaments after cell death, these are used to create extracellular structures such as hair and fingernails.
Your Answer:
Your Answer:
Answer: B, Intermediate filaments. See book page 291.
3. Connects with adherens junctions.
Your Answer:
Your Answer:
Answer: A, microfilaments. See book page 292.
4. Connects with desmosomes.
Your Answer:
Your Answer:
Answer B, intermediate filaments. See book page 292.
5. Forms the nuclear lamina.
Your Answer:
Your Answer:
Answer: B, intermediate filaments. See book page 291.
6. Forms the spindle apparatus in dividing cells.
Your Answer:
Your Answer:
Answer: D, microtubules. See book page 298.
7. Forms the thick filament in skeletal and cardiac muscle.
Your Answer:
Your Answer:
Answer: C, myosin. See book page 289.
8. Is held in a monomeric form by profilin.
Your Answer:
Your Answer:
Answer: A, Actin. See book page 288.
9. Polymerizes on initiation sites provided by the Arp 2/3 complex.
Your Answer:
Your Answer:
Answer: A, actin. See book page 288.
10. Supports the thin extensions of the cell edge called cilia.
Your Answer:
Your Answer:
Answer D, microtubules. See book page 286.
11. Supports the thin extensions of the cell edge called microvilli.
Your Answer:
Your Answer:
Answer A, microfilaments. See book page 288.
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