In the spiral staircase model of DNA, the rungs are
a. deoxyribose sugars.
b. hydrogen bonds.
c. nucleotide base pairs.
d. phosphate groups.
e. composed of all of these.
Answer: c
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All the members of a single species that occupy a particular area at the same time are known as a
A. sub-population. B. gene pool. C. group. D. subspecies. E. population.
All of the following are animal mechanisms to cope with the problem of water balance EXCEPT
A. secretion of regulatory hormones into the tubule. B. coupling of water/salt removal with metabolic waste removal. C. kidneys used as filtering organs. D. contractile vacuoles. E. passage of water and waste of the body across a layer of cells into a tubular structure.
The functional group that characterizes an alcohol is
A. ?NH2 B. ?SH C. ?OH D. ?PO4 E. ?COOH
Horizontal gene transfer is the transfer of genes between
A. cells within a multicellular organism. B. two chromosomes in a nucleus. C. organelles within a cell. D. different species, either prokaryotic or eukaryotic. E. one prokaryotic species to a different prokaryotic species.