Ribosomes are:
a. composed mostly of a type of nucleic acid
b. sometimes attached to mitochondria forming “rough” mitochondria
c. important sites for energy release
d. none of the above
a. composed mostly of a type of nucleic acid
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A primary immune response ________, and a secondary immune response ________.
A. produces antibodies within five to ten days of exposure to antigens; produces antibodies within a day or two of a subsequent exposure to the same antigen B. occurs only in children; occurs only in adults C. is very rapid in producing antibodies after exposure to antigens; is very slow in producing antibodies after exposure to antigens D. is very important; is less important to the body's ability to protect itself
When defective erythrocytes are broken down,
A. they are removed from the blood by the lungs. B. bilirubin is formed from the breakdown of hemoglobin. C. their heme groups are converted into amino acids. D. their iron is excreted into the small intestine. E. their components cannot be recycled.
Which one of the following bone cells would have the greatest number of lysosomes?
A) Stem cells B) Osteoblasts C) Osteoclasts D) Osteogenic cells E) Osteocytes
________ are essential for the reproduction of B cells and other types of cells.
A. Memory B cells B. Helper T cells C. Cytotoxic T cells D. Regulatory T cells