What are leukocidins?

A) Molecules that are capable of destroying phagocytes
B) Molecules that can degrade IgA
C) Molecules that destroy the complement proteins


Ans: A) Molecules that are capable of destroying phagocytes

Biology & Microbiology

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How can repositioning nucleosomes affect transcription (select all correct choices)?

A. Moving nucleosomes could expose a promoter resulting in repression of transcription. B. Moving nucleosomes could cover a promoter resulting in repression of transcription. C. Moving nucleosomes could expose a promoter resulting in activation of transcription. D. Transcription is not affected by repositioning of nucleosomes.

Biology & Microbiology

Carbon has four electrons in its valence shell. It will typically form ____ covalent bonds to fill its

valence shell.

a. one b. two c. four d. six e. eight

Biology & Microbiology

Plant seeds being introduced into a population by wind illustrates which of the following?

a. gene flow b. bottleneck effect c. natural selection d. founder effect

Biology & Microbiology

When observed in the lab Mycoplasma stains (acid-fast/Gram-positive/Gram-negative)

What will be an ideal response?

Biology & Microbiology