Question

41 multiple choice 1 point in a cloning process, a dna fragment is first inserted in a plasmid vector because lone dna fragments introduced into a bacterial cell will be digested by the host. its hard to obtain lone dna fragments. plasmid grows faster than a lone dna fragment. plasmid can kill bacteria to prevent contamination.

Explanation:

In DNA cloning, when a lone DNA fragment is introduced into a bacterial cell, the host's restriction enzymes (defense mechanism) will recognize it as foreign and digest it. Plasmids are used as vectors because they can protect the inserted DNA fragment from being digested and also help in its replication within the host. The other options are incorrect: obtaining lone DNA fragments is possible (e.g., via PCR, restriction digestion), plasmids don't "grow" faster in a way relevant here (they replicate, and the speed of replication is about the plasmid's origin of replication, not a comparison with lone DNA), and plasmids are part of bacterial cells (they don't kill bacteria to prevent contamination).

Answer:

A. Lone DNA fragments introduced into a bacterial cell will be digested by the host.