The cytoskeleton is a structure maintaining the shape and internal organization of the cell, thereby rendering mechanical support. It is a network of fibres forming the eukaryotic cells, prokaryotic cells and archaeans. These fibres in the eukaryotic cells contain a complex mesh of protein filaments and motor proteins that help in cell movement. A cytoskeleton is made up of the following types of fibres: Microfilaments, Microtubules and Intermediate Filaments. The cytoskeleton is composed of some motor proteins – dyneins, kinesin and myosin.
1. This statement is true
(a) microtubules are composed of tubulin
(b) microfilaments are composed of actin
(c) intermediate filaments are resistant to cytochalasin-B and colchicine
(d) all the above
Answer: (d)
2. What are flagella and cilia of eukaryotic cells made of?
(a) tubulin
(b) desmin
(c) lamin
(d) keratin
Answer: (a)
3. Cell lining of the lumen of the fallopian tube is involved in ciliary action to transport the egg from the ovary to the uterus. The cytoskeleton structure responsible for this movement is
(a) flagella
(b) microfilaments
(c) microtubules
(d) intermediate filaments
Answer: (c)
4. The intermediate filaments found in hairs and nails are a type 1 IF protein, composed of
(a) tubulin
(b) keratin
(c) vimentin
(d) lamin
Answer: (b)
5. Malformation of these cytoskeleton structures can be linked to an inability to contract a muscle
(a) microfilaments
(b) microtubules
(c) centrioles
(d) intermediate filaments
Answer: (a)
6. This is a microfilament inhibitor
(a) cytochalasin-B
(b) colchicine
(c) cinchonine
(d) aspirin
Answer: (a)
7. This is the most heterogeneous type of cytoskeleton filament
(a) intermediate filaments
(b) microfilaments
(c) microtubules
(d) none of the above
Answer: (a)
8. This cell lacks cytoskeleton
(a) prokaryotic bacterial cells
(b) eukaryotic plant cells
(c) prokaryotic and eukaryotic animal cells
(d) None of the above
Answer: (d)
9. Microfilaments are composed of
(a) mosaic protein
(b) tubulin protein
(c) chitin protein
(d) actin protein
Answer: (d)
10. A network of microfilaments and microtubules is classified as
(a) cytoskeleton
(b) active skeleton
(c) vertebral skeleton
(d) endoplasmic skeleton
Answer: (a)
These were some objective type questions on the cytoskeleton. BYJU’S presents students with MCQs on other important topics for NEET. Explore them.
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