What is it about carbon-12, carbon-13, and carbon-14 that makes them all carbon?
A) They all have the number of protons plus neutrons that is characteristic of carbon.
B) They all have the number of neutrons that is characteristic of carbon.
C) They all have the number of protons that is characteristic of carbon.
D) They all are radioactive.
E) They all are elements.
Answer: C
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a. Geographic isolation b. Reproductive isolation c. Different species d. A certain number of individuals
Four of the five hormones listed below affect blood
glucose level. Select the exception. a. calcitonin b. glucagon c. glucocorticoid d. insulin e. epinephrine
Which immune cells do not kill other cells directly?
A. B cells B. T cells C. macrophages D. neutrophils
All of the following may be targeted by TC cells, except
A) Viral-infected host cells B) Cancer cells C) Invading bacterial cells D) All of these cells could be targeted by TC cells E) Cells in transplanted tissue from an imperfectly matched donor