What is a cloning vector? a. the laboratory apparatus used to clone genes b. the sticky end of a dna fragment c. an enzyme that cuts dna into restriction fragments d. a dna probe used to locate a particular gene in the genome e. an agent, such as a plasmid, used to transfer dna from an in vitro solution into a living cell

e) An agent, such as a plasmid, used to transfer DNA from an in vitro solution into a living cell.

Explanation:

A cloning vector is a naked DNA that can be maintained and into which a foreign DNA can be inserted. A vector needs to be small in size, have restriction sites for endonuclease enzymes and the ability to multiply and express itself at a high rate, without disrupting the host cells machinery. Perfect cloning vectors are DNA molecules from viruses, plasmids and bacterial species such as E.Coli.

the concept of nucleosome occupancy, which reflects the fraction of cells from the population in which a given region of dna is occupied by a histone octamer