Most available carbon is present as ____
a. CO2
b. CaCO3
c. C
d. HCO3¯
e. N2
ANSWER: d
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The production of second messengers in signal transduction offers at least two advantages, speed and
A. specificity. B. amplification. C. one-to-one stoichiometry. D. reversibility. E. affinity.
Samara is an astronaut in deep space away from gravity. How could her urine move away from the kidneys and to the bladder in such a situation?
A) skeletal muscle movements B) the Valsalva maneuver C) peristalsis D) bladder suction pressure
Disruptive selection favors individuals possessing traits near the mean value of a population
Indicate whether the statement is true or false
One gram of ____ contains more than twice the amount of energy of a gram of glucose
a. starch b. lipids c. ATP d. protein e. amino acids