What mechanism leads to changes in allele frequencies due to random chance?
A. Sexual selection
B. Neutral variation
C. Genetic drift
D. inbreeding
E. Natural selection
Answer: C
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Where would one expect to find the most telomerase?
A. male germ cells that give rise to gametes B. skin cells from a 60-year-old individual C. skin cells from a 2-year-old individual D. a nerve cell from a 60-year-old individual E. a nerve cell from a 2-year-old individual
We know that carbon dioxide levels were in the atmosphere millions of years ago through ____
a. radioisotope dating b. measuring carbon dioxide levels in fossil fuel samples c. measuring carbon isotope ratios in fossil fuel samples d. measuring carbon dioxide levels in air pockets in ice cores e. measuring carbon isotope ratios in air pockets in ice cores
The rhythmic expansion and recoil of the wall of an artery close to the skin's surface is a(n) ________
Fill in the blank(s) with correct word
Tuberculin skin testing
A) Will be positive in active TB. B) Will be positive if person has had previous exposure. C) All of these choices are correct. D) Injects PPD intradermally. E) Uses a purified protein filtrate of Mycobacterium tuberculosis.