Blood tests can provide information on blood chemistry in order to determine if the organs of the body are functioning correctly. Which of the following test results would be least likely to cause the suspicion of cancer?
A. negative findings of CA 15.3 (none is present in the blood)
B. a drastic increase in calcium levels in the body
C. presence of specific cancer antibodies
D. elevated levels of CA 125 protein
E. elevated liver enzyme levels
Answer: A
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Recombinant DNA-based products are slow to reach the marketplace because of
A) the adverse effects of gene cloning. B) the lack of technological advances in gene cloning. C) the lack of safety involved in such methods. D) the cost and duration of research.
Which of the following can be developed from secondary plant compounds?
a. Human medications b. Pest-resistant seeds c. Alternative fuels d. Soil additives
Which of the following statements is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine, and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. None of these statements are true
Mosses are restricted to moist environments because they require water for
A. fertilization to occur. B. dispersion of spores. C. the xylem to function. D. photosynthesis.