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

Biology & Microbiology

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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.

Biology & Microbiology

Aristotle’s ideas on the natural world were

most consistent with

a. evolution. b. biogeography. c. comparative morphology. d. creationism. e. geology

Biology & Microbiology

Which of the following will eventually

produce a mature pollen?

a. megaspore b. microsporangium c. microspore d. female gametophyte e. megasporangium

Biology & Microbiology

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?

Biology & Microbiology