An organ must contain at least:

A. two different tissue types.
B. two different cell types.
C. all four of the tissue types.
D. connective tissue.
E. two different muscle types.


A. two different tissue types.

Biology & Microbiology

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Thymine dimers are commonly caused by

A) ultraviolet radiation. B) ionizing radiation such as X-rays. C) tautomers. D) alkylating agents. E) intercalating agents.

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Four of the following are members of the bony fishes. Which one is the exception?

A. Teleosts B. Ray-finned fish C. Lungfish D. Stingrays E. Lobe-finned fishes

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All of the following factors would cause potassium to shift into the cell, EXCEPT:

A) alkalosis. B) epinephrine release. C) increased vagal tone. D) insulin administration.

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