A bacillus with single flagella at both ends would be classified as

A) monotrichous.
B) amphitrichous.
C) peritrichous.
D) lophotrichous.


Ans: B) amphitrichous.

Biology & Microbiology

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Extremely high or low doses of an immunogen may suppress a specific immune response by stimulating the development of

A) specificity. B) memory. C) tolerance. D) class switching.

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What vital element missing from the atmosphere affected the type of life cells first formed on Earth?

a. Ammonia b. Carbon dioxide c. Oxygen d. Nitrogen

Biology & Microbiology

Which has been associated with aging in humans?

A) an increase in the number of mitochondria B) no change in the sequence of the mitochondrial genome C) a decrease in mitochondrial function D) an increase in mitochondrial function

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Synaptic integration means

a. all positive or excitatory stimuli are added together. b. the positive and negative ions neutralize each other. c. excitatory and inhibitory signals are combined in a neuron. d. the adjacent neurons interact so that excitatory and inhibitory stimuli cancel each other out. e. that an interneuron is involved.

Biology & Microbiology