Most antimicrobial drugs are derived from which two bacterial and which two fungal genera?
> Bacillus
> Streptomyces
> Penicillium
> Cephalosporium
> Clostridium
> Saccharomyces
> Bacillus
> Streptomyces
> Penicillium
> Cephalosporium
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Describe the pathogenesis of HIV to explain how the number of CD4 lymphocytes decline in an ongoing HIV infection
What will be an ideal response?
Blood for transfusion is frequently tested for HIV by using the
A. complement fixation test. B. agglutination test. C. ELISA method. D. Ouchterlony test.
Unlike fish, lancelets as a adults do not have
a. a dorsal, hollow nerve cord. b. gill slits. c. a brain. d. a tail extending beyond the anus. e. more than one of these.
Rickettsias and chlamydias are classified as
A) Gram-positive bacteria. B) extracellular parasites. C) obligate intracellular parasites. D) hyperthermophiles.