Disadvantages of continuous cell cultures include
A. they only grow for a limited number of generations.
B. the expense of preparation.
C. they may be significantly different genetically from the original source animal.
D. viruses do not reliably infect them.
E. they are both expensive and have a limited number of divisions.
Answer: C
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What would be the outcome if the pump protein shown in Fig. 5.13a instead acted as a carrier that allowed protons to move from the extracellular fluid into the cytoplasm?
A. The proton electrochemical gradient would be reversed. B. ATP could be synthesized from ADP + Pi. C. The number of protons on either side of the membrane would equalize. D. Two answer options are true: ATP could be synthesized from ADP + Pi AND the number of protons on either side of the membrane would equalize.
Incomplete genetic linkage of three genes in a trihybrid produces eight genetically different gamete genotypes. How many different gamete genotypes are produced in a four-gene cross with incomplete genetic linkage?
A) 4 B) 8 C) 16 D) 20 E) 24
The single most preventable cause of disease in the United States is:
a. alcohol use.
b. tobacco use. c. automobile accidents. d. suicide. e. homicide.
Increased temperature, swelling, redness, and pain are the generalized symptoms of
A. anaphylactic shock. B. the release of antigens. C. specific defense mechanism. D. inflammation.