Which of the following cells has the greatest surface-to-volume ratio?

A) bacterium
B) human red blood cell
C) human muscle cell
D) ostrich egg


Answer: A

Biology & Microbiology

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Which one of the following statements is true regarding antimicrobial therapy and susceptibility testing?

a. Cephalosporins and macrolides are inef-fective against M. catarrhalis. b. Resistance to quinolones is emerging in strains of N. gonorrhoeae. c. Most Neisseria spp. are resistant to peni-cillin. d. Most strains of N. meningitidis are resis-tant to penicillin.

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Covalent modification

A) can activate an enzyme. B) affects the activity of an enzyme by adding or removing a chemical group. C) can involve the addition of phosphate groups. D) produces modifications that can sometimes be reversed. E) All of these are correct.

Biology & Microbiology

In an inflammatory response, the direct effect of histamine is to ____

a. dilate blood vessels causing increased blood flow to the area of infection b. decrease heat accumulation in the area of infection c. directly kill bacteria d. attack cytotoxic T cells e. cause B cells to release antibodies

Biology & Microbiology

DNA microarray analysis is excellent for ________

A) studying all of a sample's genes simultaneously B) studying one gene's expression very closely C) studying all of a sample's expressed genes simultaneously D) studying all of a sample's unexpressed genes simultaneously

Biology & Microbiology