The appearance of these cells indicates that they were placed in a solution that was
1.isotonic
2.hypotonic
3.hypertonic
4.plasmolic
3
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A small population isolated at the edge of a species’ geographic distribution may experience ____ and genetic drift,
which may lead to the evolution of distinctive traits by ____.
a. population bottlenecks; artificial selection b. a founder effect; natural selection c. gene flow; natural selection d. natural selection; population bottlenecks e. population bottlenecks; founder effects
Thinking critically, one flaw with the Olestra experiment is that ________
a. people were offered bags containing different quantities of chips and intake was not measured b. experimental subjects were discouraged from moving about during the experiment c. 89 people who ate Olestra chips got stomach cramps but the researchers did not conclude that Olestra causes cramps d. people were all offered bags containing the same amount of chips but intake was not measured
Which scientist(s) discovered the basis for the base-pair rule, which states that the amounts of thymine and adenine are
always equal in all DNA molecules, as are the amounts of cytosine and guanine?
a. Watson and Crick b. Beadles c. Chargaff d. Franklin e. Pauling
Which of the following is a theory?
A) A boy finds a chipped rock he believes is an arrowhead. B) Many people claim that the Earth is only 6,000 years old. C) There is molecular and biochemical evidence that all organisms are related. D) Many people believe echinacea cures their colds.