Sketch an exponential growth curve with correctly labeled axes. Identify two organisms and the
conditions under which they might demonstrate such growth. What will be an ideal response?
The sketch should resemble Fig. 53-2 on textbook p. 1157.
This curve is exemplified by bacteria and elephants having a constant per capita growth rate under
ideal conditions when resources are abundant and population density is low.
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A human cell and a mouse cell were experimentally fused, and the results demonstrated that ________
a. proteins cannot move laterally in the membrane b. large polar molecules can enter cells only through transport proteins c. proteins can move laterally in the plasma membrane d. human/mouse chimeric embryos are not viable
In gene therapy, what is transferred into an individual’s chromosomes?
a. a new genome b. an unmutated gene c. a mutated gene d. bacterial plasmids e. DNA libraries
The scientific name of the American copperhead is Agkistrodon contortrix and the scientific name of the Australian pygmy copperhead is Austrelaps labialis. Based on this information, which of the following statements is true?
A. The common name "copperhead" must mean the two snakes are closely related. B. Both copperheads are the same species. C. Both copperheads are classified in the same genus. D. None of the above are correct.
APC is a tumor suppressor and acts in the Wnt signaling pathway to prevent the TCF complex from turning on Wnt-responsive genes
Mice that lack the gene encoding TCF4 do not have the ability to maintain the pool of proliferating gut stem cells needed to renew the gut lining. What do you predict will happen in mice that lack the APC gene? (a) Mice lacking the APC gene will be like the mice lacking TCF4 and not be able to renew the gut lining. (b) Mice lacking the APC gene will have inappropriate proliferation of gut stem cells. (c) Mice lacking the APC gene will have a hyperactive Wnt receptor even though there is no Wnt signal. (d) Mice lacking the APC gene will be like normal healthy mice, since APC is a tumor suppressor and thus not needed unless there is a tumor present.