Which gas has had the greatest impact on life

on earth?



a. carbon dioxide
b. methane
c. nitrogen
d. hydrogen
e. oxygen


E

Biology & Microbiology

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Examination and work-up of a culture and interpretation of results by the microbiologist would pertain to which step in the quality assurance process?

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Which of the following is often called the body's thermostat?

a. the pituitary b. the hypothalamus c. the thalamus d. the corpora quadrigemina e. the medulla oblongata

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In multiple sclerosis, a victim:a

loses coordination due to the replacement of myelin with scar tissue. b. accumulates neurofibrillary tangles in the brain resulting in dementia. c. suffers tremors due to overly rapid and spontaneous firing of neural impulses. d. is unable to transmit neural impulses because poisons interfere with the action of the ion pumps. e. suffers depression due to abnormal secretion of neurotransmitters

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Which component of the following reaction is the enzyme? sucrose + sucrase + water ? sucrase + glucose + fructose

A) sucrose B) sucrase C) glucose D) fructose

Biology & Microbiology