The biological macromolecule that is least soluble in water is a(n):
A. lipid.
B. nucleic acid.
C. protein.
D. carbohydrate.
E. enzyme
A
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The fastest way for organisms to adapt to a changing environment involves _____
A) mutation B) asexual reproduction C) sexual reproduction
Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling. B. Purified plasmid DNAs are supercoiled even though all proteins are removed. C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils. D. Linear fragments of double-stranded DNA are not supercoiled. E. None of these choices is correct.
What scientific concept did Charles Darwin and Alfred Wallace independently discover?
a) sexual reproduction b) mutation c) overbreeding d) natural selection
A phage that is part of a bacterial chromosome is said to be
a. self-replicating. b. immune. c. conjugating. d. lysogenic. e. virulent.