Habitat: Human Colon
What will be an ideal response?
•Different type of environment than mouth, stomach and the small intestine.
•Bacterial concentrations in the colon are extremely high (1012/g, >5000 taxa).
•Some methane-producing archaea are present at low levels
•Colon is designed to be a holding tank for microbes, like rumen in cattle.
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When packaged in the virion, the complete complex of nucleic acid and protein is known as the virus
A) capsid. B) concatemer. C) nucleocapsid. D) envelope.
Deoxyribose is
(a) a five-carbon sugar. (b) present in RNA. (c) a nitrogen-containing base. (d) one type of purine.
The basic unit of contraction in a skeletal muscle is ____
a. the cell b. the myofibril c. a sarcomere d. actin e. myosin
Some drugs modulate the activity of ion channels. For example, Novocain somewhat inhibits the opening of sodium channels. What happens to the threshold of a sensory neuron if this drug is used?
A) It will take less stimulation to reach threshold. B) It will take more stimulation to reach threshold. C) Threshold will not change. D) The nerve will not function and will die off.