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How many protofilaments are present in a single mammalian microtubule?

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How many protofilaments are present in a single mammalian microtubule?

(a) 5

(b) 13

(c) 20

(d) 26
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Right choice is (b) 13

Explanation: There are about 10-15 protofilaments typically found in an animal cell. Exclusively in mammals there are 13 protofilaments which wound up together to form a 24 nm wide cylindrical tubule.
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