Which of the following areas is not known to contain stem cells?
A) the skin
B) bone marrow
C) the umbilical cord
D) muscle
D
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Clostridium tetani in deep puncture wounds can cause the disease ________ in humans.
Fill in the blank(s) with the appropriate word(s).
Beta thalassemia is most often caused by
A. amino acid substitutions. B. extended chains in beta globin. C. lowered or absent synthesis of beta globin. D. excessive synthesis of beta globin. E. altered rates of oxygen transport.
Why is oxygen considered highly electronegative?
A) It pulls electrons toward itself. B) It has a nonpolar structure. C) It repels electrons away from its nucleus. D) It discharges electrons readily out of the atom.
Which of the following statements about natural killer cells is TRUE?
a. NK cells recognize and destroy infected cells using a three-receptor system. b. NK cells exhibit memory after interacting with cells. c. NK cells use granzymes to kill their targets. d. NK cell number does not increase during recognition and destruction of infected cells.