The adrenal hormone, aldosterone, regulates kidney function by
A. stimulating active reabsorption of sodium, decreasing its excretion.
B. increasing the permeability of the collecting duct to salt.
C. increasing the permeability of the collecting duct to urea.
D. triggering a sensation of thirst.
E. reducing the blood flow to the kidney.
Answer: A
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The nitrogenous base that is only found in DNA and not in RNA is:
A. cytosine. B. uracil. C. adenine. D. thymine. E. guanine.
The supercoils in the loops of the nucleoid can be relaxed by introducing nicks
A. true B. false
Martin keeps a worm bin in his basement because they need cooler temperatures to survive. He feeds them about 1 pound of kitchen scraps each week. One summer the temperatures rose above the optimal temperature for the red worms (~ 85°F) and many in his colony died. However, those that survive continued to reproduce and within 6 months his colony was again thriving. The next summer, unusually warm temperatures again cause the basement temperatures to rise above 85°F for 2 days in a row. Surprisingly, Martin noticed that only a small portion of the worm colony died. What is the best explanation for this?
What will be an ideal response?
Explain why a eukaryotic mRNA that has begun to be degraded from the 3' end, but still has its complete coding region intact is not efficiently translated
What will be an ideal response?