The work of scientists usually begins with
A) drawing conclusions.
B) careful observations.
C) testing a hypothesis.
D) creating experiments.
Ans: B) careful observations.
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A cross of two Kerry horses always produces Kerry. A cross of a Kerry with a Dexter horse produces
1/2 and 1/2. Crosses of two Dexters produce two Dexters for every Kerry. Explain. What will be an ideal response?
Predict what might happen to telomeres in Tetrahymena cells if the Tetrahymena template RNA were mutated from 3'-ACCCCAAC-5' to 3'-AGCCCAAC-5'.
A. Telomere sequence would be altered to 5'-CTTGGG-3'. B. There would be no changes in telomeres compared to normal cells. C. Telomere sequence would be altered to 5'-GGGTTC-3'. D. Telomeres would become shorter in every generation compared to normal cells.
In a 28-day cycle, the follicular phase of the ovarian cycle occurs at about ________ and the luteal phase occurs at about ________.
A. day 14; days 6-15 B. days 1-13; days 15-28 C. days 1-5; days 20-28 D. days 6-13; days 1-5
At sea level, what percentage of the air we breathe is oxygen?
a. 21% b. 30% c. 50% d. 79% e. 100%