The state of California has several large cities and very productive croplands that divert and use large amounts of water from rivers. What is one damaging effect of this use of water from the rivers?
A. increased amounts of solid waste pollution in the oceans
B. decreased amounts of fresh water in marshes and estuaries
C. changes in local rainfall amounts
D. changes in upstream water tables
Answer: B. decreased amounts of fresh water in marshes and estuaries
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You are studying a protein in Salmonella typhimurium that you believe is a toxin. Whenever you attempt to purify the protein from lysed cell cultures, you get two forms of the protein
One form is smaller than the other and is missing 15 amino acids from the N-terminus compared to the larger form. This leads you to hypothesize that A) there are two termination sites in the mRNA. B) the protein requires chaperonins to fold properly. C) the protein is secreted and folds outside of the cell. D) you need to re-do the experiment because there should only be one form.
Darwin's ideas on evolution were advanced for his time. His approach to science and natural selection were supported by what main tenet?
A. Species were unchangeable over the course of time. B. Operation of natural laws produces constant change and improvement. C. Various organisms and their structures resulted from a spontaneous action. D. The world is fixed and constant.
The most important evidence that Darwin used
to develop his theory of natural selection came from a. the Argentine pampas. b. his boyhood neighborhood in England. c. the Galápagos Islands. d. Australia and New Zealand. e. South America.
Population sizes begin to stabilize near the carrying capacity when
A) zero population is achieved. B) the number of species in the environment begins to decrease. C) environmental resistance begins to limit the population's biotic potential. D) the replacement fertility rate reaches 2.1. E) a population's biotic potential becomes unlimited.