When lactose is present in the medium, RNA polymerase will bind to the ____ of the E. coli lac operon
a. lacI gene
b. operator
c. promoter
d. transcription initiation site
e. first codon of the lacZ gene
ANSWER: c
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The process of evolutionary changes that result in formation of new species and groups of species is called
A. temporal evolution. B. artificial selection. C. macroevolution. D. serial evolution. E. a combination of temporal and serial evolution.
Most chytrids are ____
a. saprobes in soil b. parasites of plants c. symbiotic partners of cattle d. parasites of animals e. aquatic
In December of 1998, Nkem Chukwu of Houston,
Texas, gave birth to a. pentuplets. b. sextuplets. c. octuplets. d. the first human clone. e. none of these.
What is a typical feature of K-selected organisms?
a. early reproduction b. fast development c. a low reproductive rate d. small body size
e. little parental care of offspring