If a microbe is said to "ferment sugar", this means that the microbe is breaking down a sugar for energy.
a. True
b. False
a. True
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Which one of the following statements is true of the 32 allele in the CCR5 gene? (Choose all that apply)
A. It codes for a mutant protein that is completely inactive. B. It leads to a deletion which maintains the reading frame. C. It provides some protection against HIV progression to AIDS in both its heterozygous and homozygous forms. D. It is an example of a beneficial mutation. E. It affects the attachment of HIV to an animal cell by altering one of the viral proteins.
Which one of the following choices is of the first lines of defense against infection for humans?
A) White blood cells B) Skin C) Interferon D) Natural killer cells
While of the following techniques or tools has provided information regarding the nature of viruses, which one had to be developed before the genetics, biochemistry, and life cycles of viruses could be thoroughly studied?
A. viral cultivation techniques B. serological techniques C. scanning electron microscopy D. transmission electron microscopy
A test used to detect anti-Rickettsia antibodies in a patient's serum is the
A) direct fluorescent-antibody test. B) indirect fluorescent-antibody test.