Contact inhibition means that
A. cells are able to divide without the presence of stimulatory growth factors.
B. when cells come in contact with a neighbor, they stop dividing.
C. cells have gained the ability to invade lymphatic and blood vessels.
D. cells only divide a certain specified number of times and then quit.
E. there are more chromosomes within the nucleus than there should be.
Answer: B
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Fill in the blank(s) with the appropriate word(s).
The mature sporophyte body form of a typical ____ has fronds growing from a rhizome, with sori on the lower surface
or margins of some of the fronds.
a. moss b. whisk fern c. fern d. club moss e. horsetail
Methylation affects protein synthesis by
affecting which of the following proteins?
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People who wash their hands frequently during cold season typically have fewer colds than those who do not. This observation suggests cold viruses can be transmitted by
A) fomites. B) mechanical vectors. C) biologicalvectors. transmission. D) direct contact. E) both direct contact and fomites.