The concept of an ecosystem differs from that of a
community in that, unlike the community, the
ecosystem includes the
a. producers.
b. decomposers.
c. physical environmental factors.
d. animals as well as the plants.
e. parasites.
Answer: c
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About ________ percent of the human genome sequence comes from retroviruses.
A) 4 B) 8 C) 12 D) 21
Discuss the three most important factors for successful reproduction. What will be an ideal response?
Wolves feed on small and large mammals. Because they hunt and feed on other organisms, wolves are called
a) prey b) predators c) hunters d) hosts
The gene for Tay-Sachs disease codes for a nonfunctional form of the enzyme hexosaminidase A (or Hex A). It has been found that a person with only one-third the maximum amount of Hex A can function absolutely normally. Please characterize the heredity of
Tay-Sachs disease. A) multiple allelic B) codominant C) dominant D) recessive