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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 11, Problem 6SQ
Textbook Problem
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The spindle attaches to chromosomes at the _______.

  1. a. centriole
  2. b. contractile ring
  3. c. centromere
  4. d. centrosome

Summary Introduction

Introduction:  The centromere is a specific sequence in the DNA that holds two sister chromatids together in a chromosome. During prophase of mitosis, with the help of kinetochore, spindle fibers start to attach with the centromere of the chromosome. Spindle fibers, microtubules are formed of many long strands of protein which are very essential for a chromosome to divide equally among the two new daughter cells produced.

Explanation of Solution

Reason for the correct statement:

Spindle fibers are microtubules made up of long protein sub units that are extended out to pull the chromosomes apart and each side of the cell during prophase of mitotic division. They get attached with the centromere of every condensed chromosome, which helps them to pull away the chromatids easily as the centromere is the center part of every chromosome.

Option c. is given as “centromere”. The spindle attaches to the centromere of the chromosome. Hence, option c. is the correct answer.

Reasons for the incorrect statements:

Option a. is given as “centriole”. It functions as a microtubule organizing center, which helps to produce spindle fibers that attach with the centromere of the chromosome...

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