Exam 10: Genetics of Bacteria and Arachaea

Name and describe a test that could be performed to determine if a kitchen chemical cleaner is mutagenic. Also mention the purpose of control(s) for the test and how the results are interpreted.

Explain why point mutations may occasionally revert, while large- scale deletions do not revert.

The mutagens 2- aminopurine and 5- bromouracil are examples of

ISs do not encode for known phenotypic traits and are smaller than either Tn or Mu.

The evolutionary significance of phage conversion likely stems from an effective alteration of host cells.

Genetic recombination involving insertion sequences typically results in what type of mutation?

All Hfr strains possess an F factor integrated into the host chromosome.

The minimal amount of genetic information required for specialized transduction would include

Penicillin selection is a positive selection for the isolation of mutants with growth factor requirements.

The SOS regulatory system is activated by

Frederick Griffith's experiments, which showed that the R strain was able to pick up DNA from a heat- treated S strain of Streptococcus pneumonia, provided the first evidence of

Which process involves the formation of Holliday junctions?

________is a specific type of transformation where bacteriophage DNA is taken up by bacterial cells.

The designations Phe- , Leu- , and Ser+ refer to an organism's _________.

________when a bacterium's phenotype changes as the result of a(n)________ into its genome.

A strain of an organism with an increased mutation rate is known as a(n)

Consider a mutation in which the change is from UAC to UAU. Both codons specify the amino acid tyrosine. Which type of point mutation is this?

Hfr means________ , and these cells are capable of transferring genes from their ________.

Following uptake, transforming DNA becomes attached to a competence- specific protein that prevents it from nuclease attack until it reaches the chromosome.

The F (fertility) plasmid contains a set of genes that encode for the________ proteins that are essential in conjugative transfer of DNA.