The most abundant protein in mammals is collagen. This strong, ropelike molecule is particularly abundant in which tissue?

A. Skeletal muscle
B. Ligaments
C. Spinal cord
D. Heart muscle


Answer: B

Biology & Microbiology

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Most of Earth's water resides in

A) the oceans. B) the polar ice caps and glaciers. C) freshwater lakes, ponds, rivers, and streams. D) groundwater.

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One of the two adrenal medulla hormones that can be thought of as an extension of the sympathetic nervous system is

A. ACTH. B. epinephrine. C. cortisol. D. aldosterone.

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Eukaryotic chromosomes contain two general domains that relate to the degree of condensation. These two regions are ________

A) void of introns B) each void of typical protein-coding sequences of DNA C) separated by large stretches of repetitive DNA D) uniform in the genetic information they contain E) called heterochromatin and euchromatin

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Muscles that encircle tubes and act as circular valves are called

A. sphincters. B. frenula. C. cannula. D. anastomoses. E. buccinators.

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