Which of the following describes the purpose of the polymerase chain reaction?

a. increasing the number of copies of DNA
b. separating charged molecules by size and charge
c. opening cells to extract DNA in a gelatinous mass
d. cutting DNA sequences in a predictable manner


a. increasing the number of copies of DNA

Biology & Microbiology

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Which of the following is the fungus most often isolated from human clinical specimens?

A) Candida albicans B) Cryptococcus neoformans C) Histoplasma capsulatum D) Pneumocystis jiroveci

Biology & Microbiology

In competitive inhibition an inhibitor molecule binds an enzyme at the active site

1.True 2.False

Biology & Microbiology

Vertical gene transfer between one bacterium and another may occur by a process of

A. transformation B. mutation C. transfixation D. transduction E. conjugation

Biology & Microbiology

Which of the following mechanisms is used by gram-negative bacteria to cross the blood-brain barrier?

A) producing fimbriae B) inducing endocytosis C) producing toxins D) inducing TNF E) antigenic variation

Biology & Microbiology