A bunch of hormone molecules travel by one cell and have no effect but quickly stimulate the next cell. What did the second cell have that the first did not?
A) larger size
B) dendrites
C) a homeostatic response
D) receptors for the hormone
E) greater need for the hormone
Answer: D
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a. salicylic acid b. oligosaccharins c. abscisic acid d. auxins e. brassinosteroids
In the mammalian digestive system, what is the primary site of nutrient absorption?
A. large intestine B. pharynx C. stomach D. pancreas E. small intestine
Genes that are close together on a single chromosome are considered to be
A.) homozygous. B.) linked. C.) independent. D.) alleles.
Which property of antibodies is the basis for complement fixation tests?
A. agglutination B. opsonization C. neutralization D. direct killing E. complement activation