Phytoestrogens are steroid-like chemicals that are derived from soy. One of their characteristics is that they are able to
A. paralyze nerve endings.
B. increase the rate of prostate cancer in men.
C. cause estrogen breakdown within human cells.
D. cure malaria.
E. bind to the human estrogen receptor.
Answer: E
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What would happen to a person who was poisoned with a chemical that blocks the production of neurotransmitters at neuromuscular junctions?
A) The muscles would be unable to contract. B) The person's muscles would contract uncontrollably. C) The sarcoplasmic reticulum would release sodium ions instead of calcium ions. D) The muscles would swell.
Which possible use of reproductive cloning is still considered by most to be an unresolved ethical issue?
A) the production of genetically identical animals for experimentation B) cloning mammals for the production of potentially valuable drugs C) the production of organs in cloned pigs for transplant into humans D) the reproductive cloning of humans
What are the functions of the sinuses?
A. to lighten the skull and drain fluid from the brain B. to allow the brain to expand and to lighten the skull C. to give a resonant sound to the voice and to allow the brain to expand D. to drain fluid from the brain and to allow the brain to expand E. to lighten the skull and give a resonant sound to the voice