What factor is most likely to have caused the change in the number of bird species that occurred between years 30 and 60?
a. decreasing food supply
b. increasing competition among bird species
c. increasing number of bird habitats
d. evolution of new bird species
Answer: c. increasing number of bird habitats
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Which of the following is a function of reverse transcriptase?
A. It functions as a ribonuclease to degrade the viral RNA once it has been copied into DNA. B. It functions as a DNA-dependent DNA polymerase. C. It functions as a RNA-dependent DNA polymerase. D. All of these are functions of reverse transcriptase.
At what point during development does the embryo form three germ layers?
A. when the nervous system develops B. when it forms the inner cell mass C. when it becomes recognizable as human D. when it begins cleavage E. when it forms the gastrula
The largest U.S. national parks are of sufficient size to maintain populations of all mammal species originally found in these parks.
a. true b. false
Which statement about mitochondria is true?
A) Mitochondria are found in both eukaryotes and prokaryotes. B) There tend to be more mitochondria in fat cells than in liver cells. C) Most plant cells contain mitochondria. D) Mitochondria may have originated evolutionarily as photosynthetic bacteria. E) Red blood cells contain the most mitochondria of any cells in the human body.