Which is the smallest of all levels of organization?

A. organism
B. cell
C. organ
D. atom
E. population


Answer: D

Biology & Microbiology

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Diet supplements that promote the growth and metabolic activity of beneficial bacteria are known as

____________________. Fill in the blank(s) with the appropriate word(s).

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Why must water that has moved to the interstitial fluid in the medulla be quickly removed from the interstitial fluid?

A) to prevent dilution of urine B) to prevent destruction of the concentration gradient necessary for water reabsorption C) to equilibrate the concentration of solutes in the cortex and medulla D) to maintain an environment for transport of nutrients

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What is altruism?

A. Acts that cost the actor but do not benefit another B. Acts that cost the actor and benefit another C. Acts that do not cost the actor and do not benefit another D. Acts that do not cost the actor and benefit another

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Which of the following are example of biogenic amines?

A. Epinephrine, dopamine, and GABA B. Epinephrine, norepinephrine, dopamine, and serotonin C. Epinephrine, dopamine, and serotonin D. Epinephrine and endorphins E. GABA and serotonin

Biology & Microbiology