The antidiuretic hormone
a. promotes processes that lead to an increase
in the volume of urine.
b. promotes processes that lead to a decrease
in the volume of urine.
c. acts on the proximal tubules of nephrons in
the kidney.
d. is produced by the adrenal cortex.
e. fits all of these descriptions
B
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Which observation below provides evidence that differentiated cells retain all the genes of developing cells?
A) Developing cells have many mRNA transcripts that can hybridize with DNA from mature cells. B) Differentiated cells generally synthesize a specific group of proteins. C) Nuclei from mature cells can direct the development of an entire individual. D) Not all mature cells are capable of differentiation.
When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
A. an induced fit B. a great range of possible catalytic activities C. a greater supply of activation energy D. more permanent binding through intimate total contact E. more possible products of the reaction
Which factor is most likely to lead to allopatric speciation within a population of fish in a river? a. The largest males in the population claiming the best nesting sites
b. A new food source becoming available. c. Introduction of a new predator into the river. d. Increase in pesticide use by the surrounding communities. e. A dam being established on the river.
Which of the following will not prevent the further buildup of greenhouse gases?
a. Plant a tree or, better yet, plant many trees. b. Use your automobile less, and ride a bicycle more. c. Produce less waste that goes to landfills. d. Buy an air conditioner that uses chlorofluorocarbons. e. Buy an automobile that is more fuel-efficient.