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.
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Both mitochondria and chloroplasts are
thought to have evolved by the process of
a. endosymbiosis. b. sexual selection. c. allopatric speciation. d. sympatric speciation. e. more than one of these.
Thymine dimers are commonly caused by
A) ultraviolet radiation. B) ionizing radiation such as X-rays. C) tautomers. D) alkylating agents. E) intercalating agents.
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
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.