Most of the carbon dioxide produced by the
body is transported to the lungs
a. in gaseous form.
b. in blood plasma.
c. as carbaminohemoglobin.
d. as bicarbonate ions.
e. as carbonic acid
D
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In the first step of glycolysis, glucose can be phosphorylated because
A) a phosphoanhydride bond has higher energy of hydrolysis than a phosphoester bond. B) the transfer of a phosphate from ATP to glucose is exergonic. C) both the number 2 and 3 carbons can be spontaneously phosphorylated. D) the ketosugar is rapidly phosphorylated at the carbon 1 hydroxyl group. E) both choices A and B
In biological nitrogen-fixation, ____
a. ammonia is converted to nitrogen gas b. nitrogen gas is converted to ammonia c. ammonia is converted to nitrate d. amino acids are linked into proteins in ribosomes e. nitrate is converted to ammonia
A comet orchid has creamy white-colored flowers and a characteristic "tail" that contains the flower's nectar. This orchid does not emit a scent during daylight hours but is aromatic at night. The comet orchid is most likely pollinated by
A) windy nighttime conditions. B) pollen traveling on animal fur. C) a nocturnal pollinator. D) moisture from cool evenings.
Where along the nephron is glucose reabsorbed from the filtrate back into the blood?
A) distal tubule B) loop of Henle C) proximal tubule D) Bowman's capsule