A property of T cells, but not B cells, is their __________.
A) development from stem cells in the bone marrow
B) recognition of specific antigens
C) ability to differentiate into memory cells
D) ability to form cells that directly kill virus-infected host cells
E) ability to undergo clonal selection
Ans: D) ability to form cells that directly kill virus-infected host cells
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Each adenine-thymine base pair has ________ hydrogen bonds, while each guanine-cytosine base pair has ________ hydrogen bonds
A) two / one B) two / three C) four / three D) three / two
The cell junctions labeled “A” in the figure
a. prevent movement of materials between cells. b. are found in tissues subjected to stretching. c. allow the free passage of materials between cells. d. are found mostly in heart muscle. e. are found in most tissues except in the stomach.
Amine hormones include
a. estrogens. b. growth hormone. c. melatonin. d. cortisol. e. oxytocin.
Radioactive isotopes are biological tools that are often used to
A) measure the size of fossils. B) build up a store of calcium in a cell. C) detect brain tumors and other important medical technologies. D) increase the pH of blood.