Which of the following is not an example of a connective tissue?
(a) bone
(b) the layer of photoreceptors in the eye
(c) the jellylike interior of an eye
(d) cartilage
(b) The layer of photoreceptors in the eye is considered an epithelial sheet.
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The cellular basis of muscular dystrophy is that some of a child's muscle cells
A) have combined into a structure that cannot contract. B) lack DNA. C) lack a protein that enables them to withstand the force of contraction. D) have too much of a contractile protein and become weak.
Which of the following statements about atherosclerosis is false? a. Both high-fat diets and genetics influence the development of the disease
b. A heart attack occurs when a cardiac artery is completely blocked. c. High HDL levels in blood increase risk of atherosclerosis. d. Buildup of lipids in the arterial wall narrows the lumen.
Which of the following is an abiotic factor?
a. symbiotic relationships b. prey populations c. annual precipitation d. parasites
Evidence from geology suggests that initially the earth's atmosphere did not contain
a. O2. b. CO2. c. H2S. d. H2O. e. CH4.