Where does RNA polymerase first bind to on the E. coli lac operon?
a. the lac I repressor
b. the promoter
c. the operator
d. the transcription initiation site
e. the first codon of the lacZ gene
B
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Antigens specifically associate with an antibody's
A. hinge region. B. heavy chain constant regions only. C. variable regions of the heavy chains and light chains combined. D. light chain variable regions only. E. tail.
Which situation would be most likely to form a fossil under normal environmental conditions?
A. An elephant that died at the edge of a waterhole. B. A bird that died and fell to the forest floor. C. A slug that died in leaf litter. D. A jellyfish that died in an estuary.
Fertilization in humans occurs in the
a. ovary. b. uterus. c. vagina. d. oviduct. e. follicle
The group of plants that has the most species is the
a. mosses. b. ferns. c. gymnosperms. d. eudicots. e. monocots.