Gene silencing may be accomplished by ________.
A. genetic recombination
B. removal of the gene
C. methylation of cytosine bases in DNA
D. crossing over
Answer: C
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Shafts of hair are composed of
A. dead dermal cells. B. dead epidermal cells. C. living epidermal cells. D. living dermal cells.
Vascular spasms last
A. a few milliseconds when tissue damage is moderate. B. almost a full minute when tissue damage is extensive. C. several minutes when tissue damage is extensive. D. several hours when tissue damage is moderate.
Body cells communicate with immune system cells through direct contact involving the sugary coatings on the cells' surfaces.
Answer the following statement true (T) or false (F)
Atherosclerosis is the
A. hypertrophy of the tunica intima. B. stretching of arterial walls. C. inflammation of veins. D. deposition of plaques in arterial walls.