What are specialized structures composed of DNA and proteins that are the sites at which chromosomes attach to the spindle fibers?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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What are specialized structures composed of DNA and proteins that are the sites at which chromosomes attach to the spindle fibers?

Expert Solution
Step 1

DNA and chromosome

 

DNA stands for deoxyribonucleic acid. DNA is the genetic material of cells made up of deoxidized ribose sugar, phosphate, and a nitrogenous base. DNA contains genetic code that transcribes to RNA then eventually translates to a specific amino acid.

 

Condensed DNA molecule with histone proteins made a thread-like structure during cell division known as a chromosome.

 

During normal cell division, chromosomes get segregated and equally distributed to daughter cells.

Step 2

Kinetochore

 

A specialized structure composed of DNA and proteins that are the sites at which chromosomes attach to the spindle fibers is known as kinetochore.

 

The kinetochore is a disc-shaped structure made up of various proteins (around 19-20).

 

Kinetochore present in the centromere region of the chromosome, where two chromatids are attached.

 

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