Both Ehrlichia chaffeensis and Chlamydiae trachomatis reproduce in the (cytosol/nucleus/phagosome) of their hosts.
Fill in the blank(s) with the appropriate word(s).
phagosome
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E. coli has been isolated and cultured from three different individuals. Upon biochemical testing of these three cultures, you find that there are differences in some reactions. What is the best explanation of these differences?
A. These represent three different species of E. coli. B. This is normal genetic variation seen among strains of E. coli. C. The other two cultures are not really E. coli. D. Mistakes have been made in the test interpretation. E. Two of the cultures are mutants of the other.
Which of the following choices is an example of a positive feedback mechanism?
a. ceasing exercise when tired b. sweating when hot c. contractions in childbirth increasing production of oxytocin d. eating when hungry and stopping when full
Which of the following is considered to be a differential staining procedure?
A. Acid-fast stain B. Gram stain C. Both Gram stain and Acid-fast stain D. Leifson's flagella stain
The building blocks of nucleic acids are
a. amino acids. b. nucleotides. c. pentose sugars. d. phosphate groups. e. nitrogenous bases.