The alteration of a cell’s hereditary type by the uptake of DNA released by the breakdown of another cell is called
____.
a. replication
b. transformation
c. crossing-over
d. excision repair
e. ligation
ANSWER: b
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Which statement is true?
a. Retroviruses hijack existing reverse-transcription processes in cell to reproduce. b. Retroviruses activate vestigial genes in host cells to facilitate viral reproduction. c. Retrovirus genomes are encoded in RNA and must be converted to DNA in the cell. d. Retroviruses only become symptomatic within the offspring of infected host organisms.
Which of the following statements about the
electromagnetic spectrum is true? a. Infrared energy is sufficient to produce ionization. b. Infrared radiation has more energy than red radiation. c. Visible light has more energy than ultraviolet radiation. d. Chlorophyll absorbs some visible wavelengths, but not all. e. Chloroplasts absorb all wavelengths of visible light equally.
Which of the following indicators of global
warming has (have) occurred? a. increase in the temperature of the lower atmosphere b. rise in sea level c. global surface temperatures are increasing at a faster rate d. melting of glaciers e. all of these
In a population, which individuals are most likely to survive and reproduce?
A) the individuals who are best adapted to the environment B) the largest individuals in the group C) the individuals who can catch the most prey D) the individuals who grow the most rapidly