Some highly specialized cells do not undergo a cell cycle.
a. true
b. false
Ans: a. true
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Cytophaga columnaris causes columnaris (or "cottonmouth") disease in fish such as salmon. Based on the taxonomic group this species is a part of, predict some of the activities this bacterium has during infection of fish
Also mention a related taxon that likely has some of the same functions and another taxon that does not. What will be an ideal response?
If you were given the task of choosing a biological control agent for a reed from eastern China that has become invasive in the southeastern U.S., what do you think would be the best choice? Consider both the effectiveness and the safety of the agent you be releasing.
A. A generalist beetle, native to the U.S., that can consume massive quantities of the reed in a few weeks. B. A nematode, native to eastern China, that specializes on the reed but can take up to two years to kill a plant. C. A caterpillar, native to the U.S., that normally eats close relatives of the weed, but has been found in lab trials to perform better on the Chinese reed. D. A fungal pathogen from eastern China that specializes on the reed and can kill a plant in a few months.
If you wished to study the SOS response in Escherichia coli, which of the following experimental procedures could be used?
A. Transfer log phase cells from complete medium to thymine minimal medium. B. Inactivate genes that encode DNA polymerases. C. Expose cells to nonionizing radiation for 20 minutes. D. Expose cells to ionizing radiation for 10 minutes. E. All of the choices are correct.
Taste cells and the carotid bodies are alike in that both
A. respond to changes in pH. B. are chemoreceptors. C. utilize pressure to activate sensory receptors. D. are found in the mouth. E. respond to distant stimuli.