Small doses of ionizing radiation over a long period of time cause less damage because
a. they are too low to affect cells.
b. they don't hit as many targets.
c. the body has time to repair damaged DNA.
d. the radiation is absorbed by macrophages.
e. the radiation is absorbed by red blood cells.
C
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Which of the following enzymes would you expect to find in the virion of a retrovirus, but NOT in a bacteriophage?
A) lysozyme B) methylase C) restriction enzymes D) reverse transcriptase
The tapetum lucidum is a key adaptation to
A. visual function in the deep sea. B. visual function in fast moving predators. C. visual function in brightly lit shallow marine waters. D. visual function in prey species that require wide fields of vision. E. visual sensitivity in nocturnally active animals.
Pheromones activate what receptor type?
1.chemoreceptors 2.thermoreceptors 3.mechanoreceptors 4.photoreceptors
The prokaryotic chromosome is
A. composed of single-stranded DNA. B. localized to a nucleoid region. C. circular and loosely packed. D. linear and tightly wrapped around histone proteins. E. held within a membrane-bound nucleus.