Of the two polypeptide chains found in insulin, which chain is the longest?

a. chain A
b. chain B


b

Biology & Microbiology

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Variation among individuals in a species is usually caused by:

A. environmental variation. B. genetic variation. C. infectious variation. D. both environmental variation and genetic variation. E. environmental variation, genetic variation, and infectious variation.

Biology & Microbiology

Purines and pyrimidines refer to the ________ of the DNA molecules.

A) nitrogenous bases B) sugar-phosphate backbone C) hydrogen bonds D) nucleus E) histones

Biology & Microbiology

The influenza virus can infect:a

humans b. pigs c. birds d. humans and pigs e. humans, pigs and birds

Biology & Microbiology

In a process called __________ , the cell pinches in half, with one complete set of chromosomes in each half.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology