You are studying the synthesis of Molecule X in prokaryotes when you make the following observations: • When Molecule X is present in the prokaryotes’ environment, synthesis does not occur. • Molecule X synthesis increases when Molecule Z is present in the cell. • Molecule Z is never found outside of prokaryotic cells. Which statement can be supported by your observations?
a. Molecule Z is a repressor
b. Molecule Z is an inducer
c. Molecule Z is an activator
d. Molecule Z is an operon
c. Molecule Z is an activator
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All of the following are animal mechanisms to cope with the problem of water balance EXCEPT
A. coupling of water/salt removal with metabolic waste removal. B. secretion of regulatory hormones into the tubule. C. kidneys used as filtering organs. D. passage of water and waste of the body across a layer of cells into a tubular structure. E. contractile vacuoles.
Aristotle’s ideas on the natural world were
most consistent with
a. evolution. b. biogeography. c. comparative morphology. d. creationism. e. geology
Which of the following will eventually
produce a mature pollen?
a. megaspore b. microsporangium c. microspore d. female gametophyte e. megasporangium
Crosses between a yellow rat with a yellow rat
always produce yellow. Crosses between a white rat with a white rat always produce white. The alleles affect the same aspect of coat color. The crosses of a white with a yellow produce a cream. What happens if you cross two creams? What will be an ideal response?