RNA can be used as a template for the production of DNA through the action of ____.
A. DNA polymerase
B. RNA polymerase
C. reverse transcriptase
D. ligase
E. restriction endonuclease
Answer: C
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Which sequence of events describes natural selection?
A) A population of a mammal species varies in the length of their legs; water levels rise and the habitat becomes swampy; the individuals with shorter legs are better able to swim to food; the population evolves to become shorter-legged. B) A population of a mammal species lives near the water; water levels rise and the habitat becomes swampy; the animals have trouble moving in the water; the population changes to a shorter-legged type so they can move more easily in the water. C) Water levels rise, and a habitat becomes swampy; a population of a mammal species on high ground observes the change; individuals with shorter legs migrate to the area. D) A population of a mammal species lives near the water; water levels rise and the habitat becomes swampy; the act of swimming shortens the legs of the mammals; the offspring of the mammal species have shorter legs.
The lysosome contains ________ enzymes.
Fill in the blank(s) with the appropriate word(s).
One of the proposed solutions to global warming is to grow a large number of trees. This could be effective because:
A) plants are the base of all ecological food chains. B) trees would move carbon from CO2 in the atmosphere to organic molecules. C) plant carbon is different from atmospheric carbon. D) the gross primary production of trees moves CO2 into soil. E) when decomposed, plant carbon is impossible to convert back to CO2.
Which of the following genes are present in mitochondrial genomes but absent in chloroplast genomes?
a. oxidative phosphorylation genes b. rRNA genes c. tRNA genes d. all of the above