"Engaging in aerobic activity three times each week will reduce cholesterol levels" is a:
A) substantiated explanation.
B) testable hypothesis.
C) scientific control.
D) critical experiment.
E) null hypothesis.
B) testable hypothesis.
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DNA replication of a single DNA molecule is referred to as semiconservative because
a. it results in two nonidentical DNA molecules. b. one DNA strand is replicated continuously, while the other must be replicated discontinuously. c. of the two DNA molecules, one is made up totally of parental DNA, while the other is entirely newly synthesized DNA. d. all the DNA strands in the two DNA molecules will have both parental and newly synthesized DNA. e. each of the two DNA molecules will consist of one parental strand and one newly synthesized strand.
Do arteries always carry highly oxygenated blood? What will be an ideal response?
What is the maximum number of electrons in a shell?
a. 0 b. 2 c. 6 d. 8 e. 12
The evolution of eukaryotes from prokaryotes probably
A) occurred many times. B) allowed for the formation of both complexity and multicellularity. C) involved endosymbiosis on multiple occasions. D) B and C only E) A, B, and C