Steroids differ in structure from other lipids in that they have a backbone of
A. saturated carbon chains.
B. branched chains of carbons.
C. unsaturated carbon chains.
D. four fused carbon rings.
Answer: D
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Pectinate muscles are found on the
A. anterior wall of the right and left atria. B. posterior wall of the right ventricle. C. anterior wall of the right ventricle. D. anterior wall of the right atrium. E. posterior wall of the right and left ventricles.
Organized groups of cells (plus their intercellular substances) that have a common purpose form a(n) ________.
A) organ B) tissue C) organism D) organ system
Color vision has much greater resolution than night vision (vision that is mostly in shades of gray). Which of the following is the best explanation for why this is so?
A) A single cone photoreceptor often connects to a single bipolar cell and a single ganglion cell while as many as 100 rods will converge to a single ganglion cell. B) There are many more cone photoreceptors in the eye than rod photoreceptors. C) There are several types of cone photoreceptors, each of which enrich the clarity and resolution of vision. D) A larger proportion of the brain's visual cortex is active during the day when our cone photo receptors are most active.
The pigment responsible for the reddish brown color of skeletal muscle is
______. Fill in the blank(s) with correct word