Exam 14: Microbial Genetics Mechanisms of Genetic Variation

Which of the following is a possible fate for an exogenote?

The transformation frequency of very competent cells is about 10^-6, or about 1 in 1,000,000 when an excess of DNA is used.

Plasmids that have genes that decrease bacterial susceptibility to antibiotics are called __________ factors.

Which of the following is the most error-prone of the repair mechanisms?

__________ mutations occur in the promoter or operator region of a gene or set of genes and affects the expression of the downstream genes without affecting the amino acid sequences of the gene products.

Conjugative transposons

Which of the following can lead to transition mutations?

Lethal mutations can be maintained in diploid organisms if they are

Which of the following is not true of specialized transduction?

A mutation from the most prevalent form of a gene to a mutant form is called a __________ mutation.

A __________ is a latent form of a virus genome that remains within the host without destroying it.

Specialized transduction can be carried out by

Transposable elements have been found only in prokaryotes and do not appear to play a major role in eukaryotes.

When an F plasmid integrates into the host chromosome, the strain is referred to as

Transposons that transpose by inserting a copy at a new location while a copy remains at the original location are said to transpose by _______________ transposition.

_______ are strains that are unable to grow on a minimal medium that supports growth of the wild type strain but are able to grow on the minimal medium if one or more nutritional supplements are added.

Repair of thymine dimers using light to split the dimers apart into separate monomers is called

A __________ is a piece of extrachromosomal DNA that has its own replication origin.

The __________ __________ is the most prevalent form of a gene in a population.

Mutations resulting from exposure to physical or chemical agents are called __________ mutations.