Chapter 7 Questions Flashcards

(15 cards)

1
Q

What is the role of plasmids?

A

They carry genes that are not essential to bacterial function but may play an important role in the growth and lifecycle of the bacterial host. Some promote mating and other encode compounds that kill bacteria. They contain an origin of replication.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Which process of DNA transfer in bacteria requires a virus?

A

Transduction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does conjugation depend on?

A

A fertility factor present in the donor cell and absent in the recipient cell. The F+ cell creates sex pili that make contact with the F- cell. Most genes transferred conguation between the 2 cells are on the F factor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What site on the F factor enters the recipient cell first?

A

oriT site. It is always nicked at this site.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What happens in Hfr cells? (High frequency recombination)

A

The F factor is integrated into the bacterial plasmid. The chromosome follows the F factor into the recipient cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are F’ cells?

A

Cells containing an F plasmid with some bacterial genes. When an F factor is removed from the bacterial chromosome, a small amount of bacterial chromosome may be removed with it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

F+

A

Present as a separate circular plasmid, donor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

F-

A

No F factor, recipient.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Hfr

A

F factor integrated into bacterial chromosome, high frequency donor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

F’

A

Present as a separate circular plasmid carrying some bacterial genes, donor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

F+ x F-

A

Two F+ cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Hfr x F-

A

One Hfr cell and one F- cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

F’ x F-

A

Two F’ cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does antibiotic resistance in bacteria result from?

A

The action of genes located on R plasmids, small circular plasmids that can be transferred by conjugation.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does CRISPR stand for?

A

Clusterd regularly interspaced short plaindromic repeats.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly