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
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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.
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.
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
Muscles that encircle tubes and act as circular valves are called
A. sphincters. B. frenula. C. cannula. D. anastomoses. E. buccinators.