Who proposed that the structure of DNA is a double helix with two polynucleotide chains running in opposite directions and held together by hydrogen bonding between pairs of nitrogenous bases?
A. Meselson and Stahl
B. Chargaff
C. Franklin
D. Watson and Crick
E. Hershey and Chase
Answer: D
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The bulk of a jellyfish consists of
a. mesoderm. b. mesohyl. c. mesophyll. d. mesoglea. e. mesogel.
A behavioral pattern is triggered by:
a. a circadian rhythm. b. an environmental stimulus. c. a positive reinforcement. d. a psychological stimulus. e. a sign stimulus
Chemical messengers produced in one part of the body that control the activity of other parts are called _________
Fill in the blank(s) with the appropriate word(s)
Figure 19.4
The apparatus in the accompanying figure was used in the primitive Earth atmosphere simulation experiments performed by
A. Stanley Miller and Harold Urey. B. Günter Wächtershäuser. C. Australian researchers. D. Kwang Jeon. E. Francis Crick and James Watson.