A bacterial gene regulatory system is likely to have (check all that apply)
A. a motor.
B. a coding sequence.
C. an operator.
D. a ribosome recognition site.
E. one or more introns.
Answer: D
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Viruses that infect bacteria are referred to as
A. viralcidens. B. bacteriocidins. C. bacterialogens. D. bacteriophages.
What is the main function of the ozone layer?
a. to provide cloud cover for protection of polar regions b. to provide a source of oxygen for photosynthesis c. to filter toxins from acid rain d. to block most of the sun's damaging rays from reaching Earth e. to trap carbon dioxide and warm the planet
The 3 parts of a DNA nucleotide are the phosphate group, deoxyribose, and the base
a. true b. false
English ivy (Hedera helix) and wintercreeper (Euonymus fortunei) are not closely related, yet both have aerial rootlets that allow them to climb up and stick to bark on trees. What type of evolution is this?
A. Convergent. B. Radial. C. Analogous. D. Bivalent. E. Both analogous and convergent.