Plants make ____, which are similar to female sex hormones in mammals but have nothing to do with sexual
reproduction in plants.
a. estrogens
b. phytoestrogens
c. auxins
d. cytokinins
e. gibberellins
ANSWER: b
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The drug RU486, or Mifepristone, functions by _____
A) inhibiting release of gonadotropins from the pituitary B) blocking progesterone receptors in the uterus C) preventing release of the secondary oocyte from the ovary D) reducing sexual interest E) prolonging the endurance of the corpus luteum
Who demonstrated that DNA is the genetic material of the T2 phage?
A: Watson and Crick B: Meselson and Stahl C: Hershey and Chase D: Franklin E: Darwin and Wallace
Trichloroethylene (TCE) is toxic to humans because it
A. contains heavy metals. B. causes a decrease in the yield of crop plants. C. prevents CO2Â production by plants. D. depletes nitrogen from soils. E. is carcinogenic.
In a replication fork, how do the leading and lagging strands differ?
a. In the lagging strand, new DNA is synthesized 3?–5?. b. Each strand is replicated by a unique type of polymerase. c. The lagging strand is replicated discontinuously. d. DNA polymerase proceeds more slowly on the lagging strand. e. The lagging strand is subject to more error and requires more repair.