These white blood cells kill virus-infected cells exhibiting "non-self" major histocompatibility complex (MHC) proteins
A) Plasma cells
B) Macrophages
C) Dendritic cells
D) Neutrophils
E) Natural killer cells
E
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Viruses may not be cultivated in
A. live organisms. B. embryonated chicken eggs. C. tissue culture. D. blood agar.
The default state for the lac operon is "off" while the default state for the trp operon is "on". Explain this difference in
regulation and the mechanism of control via the repressor proteins
What will be an ideal response?Many bacteria facilitate the uptake of iron by secreting low molecular weight molecules, called ________, to form complexes with the iron that can then be readily transported into the cell.
Fill in the blank(s) with the appropriate word(s).
Amniocentesis is
a. a surgical means of repairing deformities. b. a form of chemotherapy that modifies or inhibits gene expression or the function of gene products. c. used in prenatal diagnosis to detect chromosomal mutations and metabolic disorders in embryos. d. a form of gene replacement therapy. e. all of these.