The more cells divide, the more chances for a cancer to develop. Which of the following cells is most
likely to give rise to a cancer?
A. Egg cells D. Mature skin cells
B. Muscle cells E. Stem cells
C. Nerve cells
E
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In hydroponic culture, what is the purpose of bubbling air into the solute?
A) to keep dissolved nutrients evenly distributed B) to provide oxygen to the root cells C) to inhibit the growth of aerobic algae D) to inhibit the growth of anaerobic bacteria E) to provide carbon dioxide for photosynthesis
Which of the following are consequences of anaerobic respiration? (Check all that apply.)
A. Some bacteria may cause denitrification. B. Some bacteria are able to perform nitrogen fixation. C. Bacteria are able to reduce the levels of NO3 ¯ in sewage plant effluents. D. Some bacteria are able to readily survive in both well-oxygenated as well as anoxic environments.
Which of the following occurs during prophase?
A) Chromosomes line up on the midline of the cell.
B) The nuclear envelope forms.
C) Sister chromatids separate.
D) The mitotic spindle begins to form.
Which of the following choices is NOT an important consideration when choosing a gene for phylogenetic sequence analysis?
a) Mutations should occur randomly at a rate that reflects the true evolutionary distance between the organisms of interest. b) The marker gene should play a complex role in the cell so that it is unlikely to be subject to lateral transfer. c) The marker gene should have the same function in all the organisms of interest. d) The marker gene should be present in multiple copies due to duplication events in the organisms of interest. e) The marker gene should be large enough to contain a fair amount of phylogenetically useful information.