A) plasmid
B) E.coli
C) nucleic acid
D) cellulose
Correct Answer: A
Solution :
Vector is a DNA molecule that has the ability to replicate in an appropriate host cell and into which the DNA fragment to be cloned (called DNA insert) is integrated for cloning, hence, a vector must have an origin of replication (on). Any extrachromosomal small genome e.g., plasmid phage, or virus may be used as vector. E.coli (in most of earliar work) used in genetic engineering to synthesize the gene product i.e., as a host. DNA and RNA together reffered to as nucleic acid. Nucleotides are the structural units of nucleic acid. Cellulose is polysaccharide. It is polymer of glucose units. It is main component of cell wall of plants and most algae.
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