A set of regulator genes is known to be very similar in both humans and flies. This fact is used to indicate what about the two species?

What will be an ideal response?


It is evidence of common ancestry.

Biology & Microbiology

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Estradiol is a potent stimulator of vitellogenesis (yolk production) in egg-laying vertebrates. Increasing evidence suggests that many pollutants, for instance those derived from pulp mills, may mimic the actions of estradiol. If one were to place a sexually immature fish in water containing pulp mill effluents, what might you expect would occur?

A. The rate of vitellogenesis would decline. B. The rate of vitellogenesis would increase. C. The fish might reach sexual maturity sooner. D. The rate of vitellogenesis would decline and the fish might reach sexual maturity sooner. E. The rate of vitellogenesis would increase and the fish might reach sexual maturity sooner.

Biology & Microbiology

An increase in root pressure will result in the rapid release of abscisic acid (ABA) and the subsequent opening of the stomata.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Junctions between adjacent epithelial cells that allow for some movement between cells so that tissues can stretch and bend are called gap junctions.

a. true b. false

Biology & Microbiology

Countercurrent exchange is used primarily in the hairpin arrangement of the ________ portion of the nephron

Fill in the blank(s) with correct word

Biology & Microbiology