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
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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.
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.
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
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