Since 1750, the main cause of increased carbon dioxide being released into the atmosphere is:
a. the burning of fossil fuels such as coal and gasoline.
b. the burning of wood.
c. cattle production.
d. erosion.
e. decompostion
A
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Helix-turn-helix and zinc fingers are secondary structural motifs in DNA and RNA, respectively.
Answer the following statement true (T) or false (F)
To increase the chance of detecting carcinogens in the Ames test, the test substance is treated with
A. penicillin. B. heat. C. ground-up rat liver. D. reverse transcriptase. E. penicillin AND heat.
The megaspore produces a plant with __________
cells. a. 2 b. 7 c. 8 d. 14 e. 16
Which of the following does NOT occur in response to baroreceptors detecting an increase in mean arterial pressure?
A) vasoconstriction B) decreased frequency of sinoatrial node action potentials C) decreased heart rate D) decreased end-diastolic volume E) decreased venous compliance