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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 25, Problem 10SQ
Textbook Problem
18 views

Feathers and hair consist mainly of ___ .

  1. a. chitin
  2. b. cartilage
  3. c. keratin
  4. d. collagen

Summary Introduction

Concept introduction: The birds in order to avoid completion on land, they evolved the volant adaptation. To suit the volant adaptation they developed wings which are made of feathers and this helps the birds to fly. The hair and fur of mammals cover the epidermis and insulate the internal anatomy from harsh outside cold environment. Both the hair and feather are made of a protein called as keratin.

Explanation of Solution

Reason for the correct answer:

Keratin is a waterproof and study protein that constitutes the feathers of birds and the hairs of mammals. Feathers are the structures derived from scales and are made of keratin. The hairs are derived from the epidermis and are made of keratin.

Option c. is given as “keratin” and since the feather of birds and hairs of mammals are made of keratin, the correct answer is option c.

Reason for the incorrect answer:

Option a. is given as, “chitin”.  The cell wall of fungi and exoskeleton of arthropods are made of chitin...

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