Steroid hormones are derived from
a. free fatty acids.
b. cortisol.
c. tyrosine.
d. cholesterol.
e. alanine.
D
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Which one of the following animals would most likely be defined as a keystone species?
A) sea otter B) housefly C) fathead minnow D) nauplii (a species of zooplankton)
If scientists were able to identify a specific gene mutation that was strongly correlated with
bladder cancer in dogs, this might be considered a __________.
a. plaque b. genetic marker c. loci d. germ cell
Which statement does not represent one of Darwin's observations?
A. All individuals have an equal chance to survive and reproduce. B. Changes in populations are gradual and take place over long periods of time. C. Members of the same species may exhibit considerable variation. D. Some characteristics are heritable and passed on to offspring. E. Some characteristics afford their possessor a better chance of survival.
Which of these gases was absent in the early Earth atmosphere at the time life first appeared?
A) nitrogen B) oxygen C) carbon dioxide D) water vapor