The lactose repressor
A. is transcribed with the structural lac genes.
B. is inactivated by binding lactose.
C. requires lactose for its transcription.
D. is activated by binding lactose.
Answer: B
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During meiosis II,
a. cytokinesis results in the formation of a total of two cells. b. sister chromatids of each chromosome are separated from each other. c. homologous chromosomes pair up. d. homologous chromosomes separate. e. sister chromatids exchange parts.
In the lungs, oxygen moves from air into blood by
A) diffusion. B) bulk flow. C) facilitated diffusion. D) active transport. E) osmosis.
Which of the following evolutionary did not occur during the Mesozoic era?
A. Widespread dinosaurs extinction B. Giant reptiles were on land an in water C. First primates were abundant D. Cycads and ferns were abundant E. First dinosaurs roamed the earth
Freshwater flatworms have this type of system for osmoregulation.
A. isonephridial B. eunephridial C. protonephridial D. osmonephridial E. metanephridial