A woman is having trouble becoming pregnant. Examination of her partner's sperm indicates that dynein feet are missing from the flagella in his sperm cells. A physician explains that this could interfere with fertility by
A) preventing the sperm from attaching to the egg cell.
B) preventing the sperm from swimming to the egg cell.
C) preventing the sperm from producing enough energy to power swimming.
D) interfering with the attachment of the flagella to the sperm.
Answer: B
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In a long term study by the evolutionary biologists Endler and Reznick, they illustrated the effect of predation on life history traits by studying guppies with different predators: cichlids and killifish. The killifish preys mostly on immature, smaller guppies and cichlids pursue mature, larger guppies. They noticed that in river portions with only killifish, the guppies were larger than in
river portions with only cichlids. How did Endler and Reznick test whether these differences in life history traits were genetic? What will be an ideal response?
Epigenetics is most closely associated with _____
a. base-pair substitution b. methylation c. Barr bodies d. hydrolysis e. phosphorylation
nonpolar covalent bond
What will be an ideal response?
If a cell's p53 genes are inactivated, the cell
a. loses control over cell division. b. no longer makes proto-oncogenes. c. stops dividing. d. activates tumor suppressors.