In the early twentieth century, ____ discovered that genes are carried on chromosomes
a. Thomas Hunt Morgan
b. Francis Crick
c. Gregor Mendel
d. James Watson
e. Thomas Huxley
ANSWER: a
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Construct a conversion table for mass. Construct it so that if you wish to convert a measurement from one unit to another, you multiply it by the number at the intersection of the original unit and the new unit.
A selectively ________ membrane is one that allows some molecules to pass through but not others.
Fill in the blank(s) with the appropriate word(s).
A polysome is
a. one of the units of a ribosome. b. the nuclear organelle that synthesizes RNA. c. an organelle that functions similarly to a ribosome during meiosis. d. the two units of a ribosome considered together. e. an mRNA molecule with several ribosomes attached.
Which of the following is NOT a special property of water?
a. Water converts from a liquid to a gas quickly and over a narrow range of temperatures. b. Water molecules tend to stick together, which can result in surface tension. c. Water can absorb significant amounts of heat energy without changing temperature. d. Water is an excellent solvent.