To treat severe combined immunodeficiency (SCID) by gene therapy, a patient's white blood cells are removed, followed by the delivery of a normal gene into the cells. The altered cells are then returned to the patient's body. This is an example of _____ gene therapy
a. enhancement
b. germ-line
c. viral
d. in vivo
e. ex vivo
e
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At least one aspect of aging has been determined to be the shortening of the ________ with each successive round of cell division.
Fill in the blank(s) with the appropriate word(s).
The image shown above is an example of a(n) ____
a. random coil b. leucine zipper c. ? sheet d. ? helix e. ? polysaccharide
DNA is present in all of the following human cell types except ________
A) skin cells B) erythrocytes (mature red blood cells) C) leukocytes (white blood cells) D) hair E) buccal (cheek) cells
One advantage of using bacteria in recombinant DNA technology is that they have a ring of DNA that is not part of their chromosome called a:
A) bacteriophage. B) restriction fragment. C) virus. D) plasmid.