An element:
a. is a substance that cannot be broken down chemically into any other substance.
b. is an atom that has lost either a proton or an electron.
c. must occur naturally on earth somewhere.
d. is a component of an atom.
e. All of the above are true.
Ans: a. is a substance that cannot be broken down chemically into any other substance.
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The release of the protein insulin from pancreatic cells occurs by rev:
A. endocytosis. B. pinocytosis. C. phagocytosis. D. exocytosis. E. receptor-mediated endocytosis.
Companion cells load most of the carbohydrates into sieve tube members ____
a. through plasmodesmata b. by osmosis c. by antiport
d. through carrier proteins e. by symport
Which of the following countries is not a member of the Economic Monetary Union?
a. England b. Italy c. Spain d. Finland
You might expect to see an example of the founder effect in:
a. the Hawaiian Islands. b. Central Africa. c. states along the Mississippi River. d. a tropical rain forest. e. China.