Tom recently started going to the gym, where he has taken up weight lifting. Increases in his
muscle mass are due to __________.
a. cell enlargement
b. cell division
c. an increase in the number of cells
d. all of these
A
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Which of the following statements explains why animals are less likely than plants to speciate by polyploidy?
A) Animals self-fertilize less often than plants, so diploid gametes are less likely to fuse. B) Animals have better mechanisms for repairing chromosomes than plants have. C) Animals are more mobile, so they have more effective prezygotic isolating mechanisms. D) Animals are more mobile, so populations get separated far less often. E) Animals use a more rigorous form of meiosis than plants, making diploid gametes much more difficult to form.
A microspore develops into a(n)
A. ovule. B. seed. C. sporophyte. D. male gametophyte. E. female gametophyte.
Which method may effectively prevent the spread of botulism?
A) Do not eat food that has been sitting at room temperature for hours. B) Avoid contact with infected individuals who are regularly sneezing. C) Thoroughly boil or cook all food products. D) Thoroughly wash hands before eating any food.
Phosphorous is usually assimilated by microorganisms as ________.
A. phosphate B. polyphosphate (volutin) C. elemental phosphate (Po) D. phosphene