What enzyme is responsible for proofreading activities during DNA replication?
a. DNA polymerase
b. RNA polymerase
c. primase
d. telomerase
a. DNA polymerase
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The toxin of Staphylococcus aureus that causes blisters and desquamation of skin in staphylococcal scalded skin syndrome is ________.
A. toxic shock syndrome toxin B. enterotoxin C. exfoliative toxin D. erythrogenic toxin E. hemolysin
The body’s main regulator of the internal
environment is the
a. anterior pituitary gland. b. hypothalamus. c. medulla oblongata. d. cerebellum. e. pons
An interaction between two species in which both species benefit is known as ____
a. mutualism b. parasitism c. commensalism d. competition e. predation
Which of the following molecules is most likely to cross the cell membrane directly by passive diffusion?
A) Na+ B) fructose (a sugar) C) a steroid hormone (a hydrocarbon) D) insulin (a polypeptide) E) fructose and insulin