V

V-Gene:

It is the sequence coding for the major part of the variable(N-Terminal) region of an immunoglobin chain.

Variegation:

This change in the phenotype is produced by the change in the genotype during somatic development.

Vector:

Vectors are vehicles for cloning DNA. A vector provides essential sequences for replicating DNA in a host and selection antibiotic markers. Non-essential sequences are deleted to allow room for the cloning of foreign DNA.

Vesicles:

These are the small bodies bounded by membrane, derived by budding from one membrane, often able to fuse with another membrane.

Virion:

It is the physical virus particle (irrespective of its ability to infect cells and reproduce).

Virulence:

Ability to infect or cause disease.

Virulent Phages:

Phage mutants that are unable to establish lysogeny.

VLSI:

Very large- scale integration allowing over 100,000 transistors on a chip.