Question

which best describes in vivo gene therapy?
a cells are first removed from the patient and then
the proper gene is inserted.
b the faulty gene is edited directly.
c the gene of interest is introduced directly into
the patient and is taken up by the patient’s cells.
d cells are first removed from the patient and then
the chromosome is altered by the gene.

Explanation:

In vivo gene therapy involves introducing the gene of interest directly into the patient's body, where it is taken up by the patient's cells. Option a describes ex vivo gene therapy (cells removed, gene inserted then returned). Option b is not the core definition of in vivo (it's about direct editing but the key of in vivo is direct introduction into patient). Option d is incorrect as in vivo doesn't involve removing cells first. So option c matches the definition.

Answer:

c. The gene of interest is introduced directly into the patient and is taken up by the patient’s cells.