The sex chromosomal combination for a human male is
A. XX.
B. YY.
C. XY.
D. XO.
E. XXX.
C. XY.
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This animal has paired nerve cords that
connect to a simple brain. This animal is
a. a lobster. b. a jellyfish. c. an earthworm. d. a grasshopper. e. more than one of these
The radioactive decay of 14C produces
a. carbon 12. b. carbon 13. c. more carbon 14. d. nitrogen 14. e. oxygen 14.
Cells are _____
A) only found in pairs, because single cells cannot exist independently B) limited in size to 200 and 500 micrometers in diameter C) characteristic of eukaryotic but not prokaryotic organisms D) characteristic of prokaryotic and eukaryotic organisms
A reaction involving the gain or one or more electrons is a(n) _____ reaction.
a) none of the choices is correct b) oxidation c) reduction d) elimination e) inclusion