13 Jun Which of the following is an advantage of the human microbiota
Question
1. Which of the following is an advantage of the human microbiota?
a. It can aid in food digestion.
b. It can inhibit the growth of pathogenic microbes.
c. It can aid in biosynthesis.
d. It can aid in nutrient absorption.
e. All of these
2. In a prokaryotic operon, genes that code for enzyme proteins are called
a. structural genes.
b. operator genes.
c. repressor genes.
d. inducer genes.
e. regulatory genes.
3. Vibrio cholerae is isolated from a GI sample and testing for cholera toxin is negative. Upon coculture with a bacteriophage, testing for cholera toxin becomes positive. This switch from a nontoxic strain to a toxic strain was mediated by:
a. Horizontal gene transfer by conjugation
b. Vertical gene transfer
c. Horizontal gene transfer by transduction
d. Horizontal gene transfer by transformation
4. A plasmid
a. An extrachromosomal piece of DNA that might confer a selective advantage to a microbe.
b. A chromosomal site to which genetic activity can be traced.
c. A molecule that carries the genetic message of the chromosomal DNA.
d. A cytoplasmic structure that transfers an amino acid to mRNA.
5. Which of the following is present in Gram-positive bacteria but not in Gram-negative bacteria?
a. Peptidoglycan
b. Capsule
c. Flagella
d. Lipoteichoic acid
e. Pili
6. Protein toxins that may interfere with host cell function or damage host cell membranes and are usually secreted by living bacteria are called
a. adhesion factors.
b. antibodies.
c. exotoxins
d. endotoxins.
7 Clostridium tetani and Bacillus cereus are both examples of
a. Gram-negative rods.
b. Normal microflora of the human body.
c. Non-spore forming Gram-positive bacilli.
d. Spore-forming Gram-positive bacilli
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