What enzyme is responsible for proofreading activities during DNA replication?

a. DNA polymerase
b. RNA polymerase
c. primase
d. telomerase


a. DNA polymerase

Biology & Microbiology

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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

Biology & Microbiology

The body’s main regulator of the internal

environment is the

a. anterior pituitary gland. b. hypothalamus. c. medulla oblongata. d. cerebellum. e. pons

Biology & Microbiology

An interaction between two species in which both species benefit is known as ____

a. mutualism b. parasitism c. commensalism d. competition e. predation

Biology & Microbiology

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

Biology & Microbiology