Which of the following must exist in a population before natural selection can act upon that population?
A. variation among individuals in reproductive success
B. genetic variation among individuals
C. sexual reproduction
D. Three of the responses are correct.
E. Two of the responses are correct.
E. Two of the responses are correct.
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You are analyzing bird excrement, the product of excretion, in the biology lab. You expect the test to show an abundance of
A. ammonia. B. urea. C. nucleotides. D. uric acid. E. allatonin.
Which of the following arise from lateral meristem activity?
a) trichomes b) tubers c) leaves d) secondary xylem e) all of the above
The most common energy carrier molecule in living organisms is
A) glucose. B) NADPH. C) ATP. D) ADP. E) DNA.
Which of the following is incorrect about eukaryotes?
A. They have chromosomes. B. They have internal compartmentalization. C. They may have flagella. D. They divide by binary fission.