Question 1

Present the general structural features of a plasmid and give an example.

Accepted Answer

The answer of Present the general structural features of a...

Question 2

In a bacterial cross in which the donor (Hfr)is a^+b+ and the recipient strain (F^-)is a^+b+,it is expected that recombinant bacteria will all be a^+b+.

Accepted Answer

In a bacterium cross between Hfr and F- strains, the recombinant bacteria will receive genetic material from the Hfr strain and then undergo recombination, resulting in a mix of traits from both the Hfr and F- strains. Therefore, the expected recombinant bacteria in this cross will not be identical to the Hfr strain and will likely have a different combination of traits, including the possible loss of the b allele.

Question 3

What is a bacteriophage?

Accepted Answer

The answer of What is a bacteriophage?...

Question 4

An Hfr cell can initiate chromosome transfer from one E.Coli to another.

Accepted Answer

Hfr cells have the ability to initiate chromosome transfer from one E. coli cell to another through conjugation. During conjugation, the F factor on the Hfr chromosome is transferred into the recipient cell, along with some of the donor cell's chromosome, allowing for the transfer of genetic material.

Question 5

What experimental observation demonstrated that genes are involved in the integration of foreign DNA into the bacterial chromosome?

Accepted Answer

The answer of What experimental observation demonstrated that genes are...

Question 6

Lysogeny is an important phenomenon in bacteria and phages.Briefly describe lysogeny.

Accepted Answer

The answer of Lysogeny is an important phenomenon in bacteria...

Question 7

Assume that one counted 67 plaques on a bacterial plate where 0.1 ml of a 10^-5 dilution of phage was added to bacterial culture.What is the initial concentration of the undiluted phage?

Accepted Answer

The answer of Assume that one counted 67 plaques on...

Question 8

Bacteriophages that cannot undergo lysogeny but can infect bacteria are called ________.

Accepted Answer

The answer of Bacteriophages that cannot undergo lysogeny but can...

Question 9

When a bacteriophage genome incorporates itself into the chromosome of the host,that phage genome is referred to as a(an)________.

Accepted Answer

The answer of When a bacteriophage genome incorporates itself into...

Question 10

A form of bacterial recombination that involves a viral intermediate is called ________.

Accepted Answer

The answer of A form of bacterial recombination that involves...

Question 11

Bacteria that are in a particular physiological state to become transformed are called ________.

Accepted Answer

The answer of Bacteria that are in a particular physiological...

Question 12

What is a significant difference between a lytic and a lysogenic cycle?

Accepted Answer

The answer of What is a significant difference between a...

Question 13

If two different auxotrophic strains are placed in a liquid medium culture tube,prototrophic strains can sometimes be subsequently recovered.Name several mechanisms by which this is possible.

Accepted Answer

The answer of If two different auxotrophic strains are placed...

Question 14

What are the roles of the recBCD genes?

Accepted Answer

The answer of What are the roles of the recBCD...

Question 15

What is the consequence of a mutation in the recA gene in bacteria?

Accepted Answer

The answer of What is the consequence of a mutation...

Question 16

What is meant by the term cotransformation?

Accepted Answer

The answer of What is meant by the term cotransformation?...

Question 17

Explain what is meant by the term heteroduplex in the context of bacterial transformation.

Accepted Answer

The answer of Explain what is meant by the term...

Question 18

Compare and contrast bacteriophage lysis and lysogeny.

Accepted Answer

The answer of Compare and contrast bacteriophage lysis and lysogeny....

Question 19

What term is used to describe the phenomenon in which a bacteriophage genome incorporates its genome into the chromosome of the host?

Accepted Answer

The answer of What term is used to describe the...

Question 20

The "interrupted mating technique" provides a genetic map in Drosophila.

Accepted Answer

The "interrupted mating technique" was used to map genes in bacteria, specifically in experiments with E. coli, not in Drosophila.

Quiz 8: Genetic Analysis and Mapping in Bacteria and Bacteriophages