Changes seen in the onset of puberty are directly controlled by _____________ , and indirectly controlled by _______________.
A. Estrogen; FSH
B. Estrogen; LH
C. Progesterone; FSH
D. Estrogen; GnRH
E. Progesterone; LH
Ans: A. Estrogen; FSH
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An individual's ability to excel in certain types of sports may be due to different muscle fiber types
Certain muscle types allow some people, like marathoners, to have the ability to be involved in sports which require sustained activity of their muscles, while other muscle types, like in sprinters, allow people to excel in sports which require a rapid burst of muscle activity but fatigue quickly. The sustained activity of muscles in marathon runners is due to the higher yield of ATP per glucose. What differences would you predict for marathoners' muscles compared to sprinters'? What will be an ideal response?
In the identification of mycobacterial isolates, the niacin test involves the:
a. accumulation of niacin in the medium in which the organism is growing. b. metabolism of niacin to nicotinic acid by enzymatic action. c. testing of the isolate for susceptibility to niacin. d. utilization of niacin in metabolic pathways to produce nicotinic acid.
A long established population that has had no new individuals entering the population would be
considered to be in: a. genetic stasis. b. genetic equilibrium. c. population stability. d. allelic disequilibrium e. allele balance.
The first land animals likely moved onto land how long ago?
a. 650 million years ago b. 450 million years ago c. 250 million years ago d. 150 million years ago e. 50 million years ago