All of the following are correct in reference to type I interferons except _____
a. Type I interferons inhibit the replication of viruses.
b. In the presence of type I interferons, virus-infected cells undergo cell-surface changes that render them more susceptible to attack by NK cells.
c. Not only can most cells synthesize type I interferons, but they can also respond to them.
d. The receptor for type I interferons is abundant in the cytosol.
e. Type I interferons function in autocrine and paracrine fashions.
f. Type I interferons promote NK-cell proliferation and differentiation into cytotoxic cells.
D
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Myeloablative therapy is carried out in bone marrow transplantation in order to _____. (Select all that apply.)
a. prevent graft-versus-host disease b. prevent host-versus-graft disease c. suppress autoreactive T cells in the graft d. disable the patient's hematopoietic stem cells but not their circulating leukocytes e. provide space for colonization of transplanted stem cells in bone marrow stroma f. destroy tumors of immune-system cells.
Substances in food or supplements that destroy free radicals and slow their formation are
A) antioxidants. B) antibiotics. C) antigens. D) anticoagulants.
During labor, mothers are often given an epidural anesthetic. This would be a(n)
A. intramuscular injection that would block the sensation of pain. B. intrathecal injection that would hasten the mother's delivery time C. intramuscular injection that would sedate the mother. D. intrathecal injection that would block the sensation of pain. E. intrathecal injection that would sedate the mother.
With modern technology, Retinopathy of prematurity is no longer a problem
a. true b. false