The endomembrane system did not start
developing until the atmosphere was
a. high oxygen, high carbon dioxide.
b. high hydrogen, low oxygen.
c. changing from low oxygen to high oxygen.
d. firmly in the age of aerobes.
e. all of these
C
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The oxygen production measured in the experiments of this exercise
(a) is a consequence of the breakdown of hydrogen peroxide. (b) is an index of enzyme activity. (c) may depend on pH, temperature, or enzyme concentration. (d) is all of the above.
________ is the second messenger associated with the regulation of blood pressure.
Fill in the blank(s) with the appropriate word(s).
What is the action of the hormone glucagon?
a. stimulates the storage of glucose as glycogen in the liver and skeletal muscles b. inhibits growth at the end of puberty c. stimulates the breakdown of glycogen to glucose to raise blood glucose levels d. inhibits the release of insulin and glycogen when blood sugar levels are uncertain
If red flowers (R) is dominant over white flowers (r), plants with RR ____
a. are heterozygous b. are homozygous dominant c. have red flowers d. have white flowers e. have pink flowers