Which of the following structures of proteins is composed of two or more polypeptide chains?

A) secondary
B) quaternary
C) tertiary
D) primary


Ans: B) quaternary

Biology & Microbiology

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With increasing altitude, air density ________

Fill in the blank(s) with correct word

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The sex-determining chromosomes of a human male are the

A) Z and Z chromosomes. B) Y and Z chromosomes. C) X and Y chromosomes. D) Y and Y chromosomes. E) X and X chromosomes.

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The fimbriae of Neisseria gonorrhea and enteropathogenic E. coli are examples of

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