1. How are Hfr strains of bacteria different from F+ strains? Select one: a. Cel

ID: 48660 • Letter: 1

Question

1. How are Hfr strains of bacteria different from F+ strains?

Select one:

a. Cells of Hfr strains cannot initiate conjugation with F- cells.

b. Cells of Hfr strains can initiate conjugation with F+ cells or other Hfr cells.

c. Cells of Hfr strains are able to transfer chromosomal genes, whereas cells of F+ strains cannot.

d. The F factor is integrated into the bacterial chromosome in all or most cells of an Hfr strain but in only a few cells in an F+ strain.

2. Which of the following statements about antibiotic resistance in bacteria is NOT true?

Select one:

a. Antibiotic resistance often originates from the microbes that produce antibiotics for their own survival.

b. The antibiotic resistance gene can be transmitted to bacteria via transformation or transduction.

c. Antibiotic resistance cannot be conferred by conjugation as conjugation only affects the fertility of bacteria.

d. Environments where antibiotics are frequently used such as hospitals are under the higher risk of developing antibiotic resistance.

e. The plasmid containing the antibiotic resistance gene can pass the genes to genetically unrelated bacteria.

1.Correct answer is: c.Cells of Hfr strains are able to transfer chromosomal genes, whereas cells of F+ strains cannot.

Reason:Hfr strains can transfer F factor along with chromosomal genes to recipients (known as F' cells) while F+ strains cannot do so.

2.Correct answer is:c. Antibiotic resistance cannot be conferred by conjugation as conjugation only affects the fertility of bacteria.

Reason:During conjugation, antibiotic resistant genes can also be transferred from one bacterium to the other.

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