Describe amplification of hormone action
What will be an ideal response?
ANSWER: Small quantities of hormones can typically produce profound effects in cells and on body
functions (the basic process of amplification). In amplification, binding of the hormone to a
receptor triggers activation of many proteins, each of which then activates an even larger
number of proteins for the next step in the cellular reaction pathway, and so on, increasing
in magnitude for each step in the pathway.
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The CYP26B1 protein is closely related in humans, mice, rats, and zebrafish. What does this likely indicate about its
role in germ cell development?
a. CYP26B1does not regulate germ cell development. b. CYP26B1regulates germ cell development in humans and rats but not in mice and zebrafish. c. CYP26B1's role in regulating germ cell development is conserved. d. CYP26B1's role in regulating germ cell development varies largely among species. e. It is impossible to draw any conclusions from this finding.
Which of the following would be an example of an r-selected species?
a. cheetahs b. elephants c. jellyfish d. primates
Genetic variation in behavior occurs between species and within species. Describe the genetic basis for the difference in mating behaviors in closely related species of voles
What will be an ideal response?
Cells that are terminally differentiated ______________________
(a) will undergo apoptosis within a few days. (b) can no longer undergo cell division. (c) are unable to move. (d) no longer produce RNAs.