The Gram-positive rod that is also acid-fast and is a human pathogen is
A. Corynebacterium diptheria.
B. Mycobacterium tuberculosis.
C. Streptococcus pyogenes.
D. Listeria monocytogenes.
B
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Naegleria fowleri is a free-living ________ that causes infection by ________
A) amoeba / entering through the nose and burrowing into the brain B) fungus / entering the lungs when contaminated soil is disturbed C) flagellated protist / crossing the intestinal mucosa into the blood D) protist / entering the vagina in women, the prostate and seminal vesicles of men, or the urethra of both males and females
All of the following participate in apoptosis except
A) caspases. B) death-promoting proteins. C) mitochondria. D) Bcl-2. E) calcium ions
Which of the following groups contain diarrhea-causing E. coli?
A. enterotoxigenic B. enteroinvasive C. enteropathogenic D. enterohemorrhagic E. All of the choices are correct
Usually, bacteria only make tryptophan when tryptophan is absent or available in low concentration. However, a particular bacterial mutation makes tryptophan all the time whether or not tryptophan is present. What could explain this phenotype?
A) trpA is mutated B) trpE is mutated C) trpD is mutated D) the antiterminator hairpin is unable to form E) the terminator hairpin is unable to form