Loosely packed regions of DNA associated with histones are called ____

a. euchromatin
b. heterochromatin
c. chromosomes
d. nucleosomes
e. 30-nm chromatin fibers


ANSWER:  a. euchromatin

Biology & Microbiology

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A mutation in the gene that codes for a connective tissue protein called fibrillin causes ____________________.Fill in the blank(s) with the appropriate word(s)

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When in its life cycle does a B cell first exhibit its particular surface antigen receptor?

A) after the memory cell giving rise to it divides B) before it ever encounters an antigen C) after it encounters several antigens D) after it encounters a single antigen

Biology & Microbiology

Current theories hold that hominin species migrated out of Africa

A) once, 10 million years ago. B) once, nearly 800,000 years ago. C) once, about 150,000 years ago. D) once, nearly 2 million years ago. E) multiple times throughout history.

Biology & Microbiology

__________ occurs when two species act as agents of selection upon one another.

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

Biology & Microbiology