Dikaryotic cells are denoted as:
a. n + n.
b. n ? n.
c. n.
d. 2n.
e. 2n ? n.
A
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Adding helical turns to a closed-circular DNA:
A. will decrease the linking number. B. causes the formation of left-handed supercoils. C. causes the formation of negative supercoils. D. causes the formation of right-handed supercoils. E. does not affect the linking number.
Guard cells
a. surround the stoma. b. control the opening to the interior of the leaf. c. become swollen when it becomes light, if environmental conditions are not too hot or dry. d. absorb water from surrounding epidermal cells. e. do all of these
Chemicals in tobacco smoke can cause
a. DNA to break into pieces. b. mispairing of bases. c. kinking in the DNA molecule. d. the formation of nucleotide dimers. e. covalent bonding between adjacent adenine bases.
A population of wolf spiders exemplifies a
__________ population distribution. a. clumped b. random c. uniform d. constant e. homogeneous