A DNA library is:
1.A general collection of all genes sequenced so far
2.A collection of DNA fragments that make up the entire genome of an organism
3.All DNA Fragments identified with a probe
4.All DNA fragments inserted into a probe
sol:
A collection of DNA fragments that make up the entire genome of an organism
a. A DNA library is a collection of DNA fragments that have been cloned into vectors like plasmids and bacteriophages so that researchers can identify and isolate the DNA fragments that interest them for further study.
b. There are basically two kinds of libraries: genomic DNA and cDNA libraries.
c. A genomic library contains all of the sequences present in the chromosome(s), including DNA sequences that are not transcribed. Because a cDNA library is made as a DNA copy of mRNA, it contains only those DNA sequences that are expressed in the cell.