What is recombinant DNA?

What is recombinant DNA?

• A. RNA that codes for proteins.
• B. DNA that has been formed artificially by combining constituents from different organisms.
• C. A lipid molecule that stores energy.
• D. A gene expressed only in bacteria.

Answer: (B)

Recombinant DNA is DNA formed artificially by joining DNA sequences from different organisms. This means creating a molecule that contains genetic material from more than one source, typically by cutting DNA with restriction enzymes to produce compatible ends and joining them with DNA ligase, often into a vector like a plasmid and introducing it into a host cell for replication or expression. This concept explains why the definition emphasizes combining constituents from different organisms rather than describing RNA, lipids, or gene expression patterns alone. RNA that codes for proteins is messenger RNA, not DNA; a lipid molecule stores energy is a lipid like a triglyceride; and a gene expressed only in bacteria relates to expression patterns rather than the creation of hybrid DNA molecules.

Recombinant DNA is DNA formed artificially by joining DNA sequences from different organisms. This means creating a molecule that contains genetic material from more than one source, typically by cutting DNA with restriction enzymes to produce compatible ends and joining them with DNA ligase, often into a vector like a plasmid and introducing it into a host cell for replication or expression. This concept explains why the definition emphasizes combining constituents from different organisms rather than describing RNA, lipids, or gene expression patterns alone. RNA that codes for proteins is messenger RNA, not DNA; a lipid molecule stores energy is a lipid like a triglyceride; and a gene expressed only in bacteria relates to expression patterns rather than the creation of hybrid DNA molecules.