Engineering Questions with Answers - Multiple Choice Questions

MCQs on The Cytoskeleton

1 - Question

. How many filamentous structures together comprise the cytoskeleton?
a) 1
b) 2
c) 3
d) 4

View Answer

Answer: c
Explanation: Three filamentous structures: microtubules, microfilaments and intermediate filaments together comprise the cytoskeleton.

2 - Question

Cytoskeletal filaments are polymers of ________________
a) proteins
b) ribonucleic acids
c) deoxyribonucleic acids
d) carbohydrates

View Answer

Answer: a
Explanation: The three cytoskeletal elements are polymers of proteins subunits held together by weak, non-covalent bonds. This characteristic construction leads to rapid assembly and disassembly.

3 - Question

Microtubules are formed of the protein ____________
a) clathrin
b) keratin
c) tubulin
d) actin

View Answer

Answer: c
Explanation: The cytoskeleton element, microtubules are long, hollow and unbranched polymer tubes composed of the protein tubulin.

4 - Question

Microfilaments are composed of the protein ____________
a) actin
b) myosin
c) tubulin
d) niacin

View Answer

Answer: a
Explanation: Microfilaments are solid, and thin structures organized into branching networks, composed of the protein actin. These play a role in cell motility and contractility.

5 - Question

Microtubules of a dividing cell form the mitotic spindle.
a) True
b) False

View Answer

Answer: a
Explanation: Microtubules of a dividing cell form the mitotic spindle required for chromosome segregation. Microtubules in the nerve and epithelial cells play a role in organelle transport.

6 - Question

. The cytoskeleton framework plays a role in positioning of the cell organelles.
a) True
b) False

View Answer

Answer: a
Explanation: The internal framework of a cell (the cytoskeleton) is responsible for positioning the various organelles. This is particularly evident in polarized epithelial cells where organelles are specifically ordered from apical to the basal end of the cell.

7 - Question

Cilia and flagella are ________________
a) intermediate filaments
b) microfilaments
c) microtubules
d) phospholipids

View Answer

Answer: b
Explanation: Cilia and flagella are microtubule-containing locomotor organelles that protrude from the cell surface of prokaryotic organisms.

8 - Question

Which of the following are found only in animal cells?
a) intermediate filaments
b) microtubules
c) nucleus
d) microfilaments

View Answer

Answer: a
Explanation: Nucleus is found in all living matter, although in contrasting morphology. Of the three cytoskeletal elements, intermediate filaments are only found in the animals.

9 - Question

Which of the following is found in the nucleus of animal cells?
a) microtubules
b) actin filaments
c) microfilaments
d) intermediate filaments

View Answer

Answer: d
Explanation: Intermediate filaments provide structural support to the organelle. They are found in the cytoplasm as well as the nucleus of the animal cells.

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