The most diverse animal group is the:
a. mollusks
b. arthropods
c. nematodes
d. chordates
e. cnidarians
b
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DNA replaced RNA as the main information
molecule probably because a. DNA contains thymine and RNA does not. b. DNA is double stranded and breaks less easily. c. DNA can store more protein-building instructions in less space. d. RNA is highly unstable. e. two of these are correct
A(n) ________ is a chemical that can be used to sterilize materials.
A. antiseptic B. oxidant C. disinfectant D. sterilant
A pear plant with the genotype Aa can produce gametes containing:a
either A or Aa. b. only the dominant A. c. only the recessive a. d. either A or a. e. either AA, Aa, or aa.
Extensive data from hospitals have shown that infants born with intermediate weights
are the ones most likely to survive. This is a classic example of which type of selection? a. directional selection b. stabilizing selection c. disruptive selection d. natural selection e. no selection