Which of the following is a way in which bacteria help the environment?
A) They are used to water in sewage treatment facilities.
B) They break down dead organisms in the soil and recycle nutrients.
C) They remove pollutants from the environment.
D) All of the above are ways in which bacteria help the environment.
D
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The physiologist J. Soum surgically sealed off an air sac of a pigeon and injected carbon monoxide into it. What did he observe and conclude from this experiment?
A. The bird died demonstrating the toxicity of this gas. B. The bird was fine, demonstrating this gas is not actually toxic. C. The bird died, indicating diffusion of gases across the air sac into the blood. D. The bird showed no ill effects, indicating diffusion of gases from the air sac into the blood. E. The bird showed no ill effects, indicating gases do not diffuse from the air sac into the blood.
The function of a ddNTP in DNA sequencing is to methylate guanine
Indicate whether the statement is true or false
IgA is the most abundant immunoglobulin made by the body
Indicate whether this statement is true or false.
Which of the following can grow in a Petri plate on a laboratory table?
a. an anaerobic bacterium b. an aerobic bacterium c. viruses on an agar surface d. all of the above