A human population with a large percentage of post-reproductive individuals
A. is common in less-developed countries and will most likely increase in size.
B. is common in more-developed countries and will most likely increase in size.
C. is common in more-developed countries and will most likely decrease in size.
D. is common in less-developed countries and will most likely decrease in size.
Answer: C. is common in more-developed countries and will most likely decrease in size.
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Several chemical properties make water uniquely suited for its role as a central "molecule of life." Which of the following is FALSE?
A. Hydrogen bonding leads to high cohesiveness between water molecules. B. Water resists temperature changes. C. Water is always polar. D. The structure of a water molecule is stabilized by hydrogen bonds. E. Water is a good solvent of polar molecules and ions.
The adrenal medulla produces:
a. aldosterone b. epinephrine c. cortisol d. testosterone e. both aldosterone and cortisol
The protostomes are animals whose
a. stomach is in front of the crop. b. mouth is covered by a fleshy lip. c. blastopore becomes a mouth. d. digestive tract is lined by mesoderm.
For a repressible operon to be transcribed, which of the following must occur?
A) A corepressor must be present. B) RNA polymerase and the active repressor must be present. C) RNA polymerase must bind to the promoter, and the repressor must be inactive. D) RNA polymerase must not occupy the promoter, and the repressor must be inactive.