The human body has close to ____ muscles
a. 100
b. 206
c. 300
d. 500
e. 700
E
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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.
C5a peptidase
A. is a virulence factor. B. synthesizes C5a. C. is produced by the host cell in response to infection. D. is a molecule promoting chemotaxis. E. is a virulence factor AND is a molecule promoting chemotaxis.
The main center for homeostatic control of the internal environment is the ____
a. pons b. medulla oblongata c. hypothalamus d. thalamus e. cerebellum
Sponges are found ________
A) only in seawater B) mostly in seawater C) only in fresh water D) mostly in fresh water