DNA and Genetics

Genetic exchange takes place between a pair of homologous DNA sequences in general recombination. These are usually located on two copies of the same chromosome, although other types of DNA molecules that share the same nucleotide sequence can also participate.

This is true. Site-specific recombination does not require homologous sequences and is important for the integration of viral genomes into bacterial chromosomes.

The greatest amount of genetic information is transferred during conjugation because actual physical contact occurs in this process. It makes it possible to transfer large DNA sequences.

Transfer of genes from a Hfr into a F-recipient cell (conjugation) requires the recA gene product because the incoming genes need to be inherited by homologous recombination.

An insertion sequence is a small bacterial transposon that carries only the genes needed for its own transposition.

Distributive conjugal transfer takes place in Mycobacterium smegmatis. In Mycobacterium smegmatis, all regions of the chromosome are transferred with comparable efficiency.

This is false. Insertion sequence elements appear to mediate recombination between non-homologous DNA molecules or sequences.

The transfer of genes between bacteria by conjugation is known as horizontal gene transfer. It plays an important role in the evolution of bacteria that can degrade novel compounds.

Relaxase enzyme creates a nick in one of the strands of the conjugative plasmid at the oriT during conjugation. Thus, it is not involved in excision repair in bacteria.

Caesium chloride is an inorganic compound with the formula CsCl. It is widely used in isopycnic centrifugation for separating various types of DNA. It is a reagent in analytical chemistry, where it is used to identify ions by the colour and morphology of the precipitate.

This is the correct answer. AUGUSTUS is a program that predicts genes in eukaryotic genomic sequences. mGene is a computational tool for the genome-wide prediction of protein coding genes from eukaryotic DNA sequences.

Phrap is a widely used program for DNA sequence assembly and finishing tools from the UW Genome Centre.

M13 is a filamentous bacteriophage composed of circular single-stranded DNA (ssDNA) which is 6407 nucleotides long encapsulated in approximately 2700 copies of the major coat protein P8 and capped with 5 copies of two different minor coat proteins (P9, P6, P3) on the ends.

Bacteriophages are composed of proteins that encapsulate a DNA or RNA genome and may have relatively simple or elaborate structures. Their genomes may encode as few as four genes and as many as hundreds of genes.