The most abundant protein in humans is:

 # The most abundant protein in humans is:

A. Fatty acids

B. Fiber

C. Carbohydrates

D. Collagen

The correct answer is D. Collagen.

Collagen is the most abundant protein in human body, characterized by its high rigidity and tensile strength.

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Which of the following collagen is found in cartilage?

 # Which of the following collagen is found in cartilage?

A. Type 1

B. Type 2

C. Type 3

D. Type 4

The correct answer is B. Type 2.

Several types of Collagen are found in different body tissues.

a. Type I - Skin, tendon, bone, dentin

b. Type II - Cartilage

c. Type III - Aorta, fetal skin

d. Type IV - Basement membrane

e. Type V - Placenta, Skin

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Percentage of proline in collagen

 # Approximately one third of collagen is glycine and about _______ is proline.

A. 14 %

B. 12 %

C. 10 %

D. 5 %

The correct answer is C. 10 %.

Approximately one third of collagen is glycine (every third position) and ten percent is proline.

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Fibrous, insoluble protein derived from epidermis is:

 # ________ is fibrous, insoluble protein derived from epidermis.

A. Collagen

B. Keratin

C. Elastin

D. Myofibril

The correct answer is B. Keratin.

Keratin is fibrous and insoluble protein derived from epidermnis. Elastin is rich in proline and other non polar side chains. Approximately one third of elastin is composed of amino acid glycine.

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