The leukocytes that are central to adaptive immunity are the
a. lymphocytes.
b. macrophages.
c. neutrophils.
d. mast cells.
e. eosinophils.
A
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Each of the following complexes pumps protons out of the matrix to generate the proton gradient except
A) complex I. B) complex II. C) complex III. D) complex IV. E) coenzyme Q.
To reinforce cell identity, vertebrate cells can methylate which nucleotide?
A. cytosine that falls next to guanine in the sequence CG B. any cytosine C. any cytosine or guanine D. guanine that falls next to cytosine in the sequence CG E. any guanine
The chromosome theory of inheritance states that
A) chromosomes that exhibit mutations are the source of genetic variation. B) the behavior of chromosomes during meiosis and fertilization accounts for patterns of inheritance. C) the behavior of chromosomes during mitosis accounts for inheritance patterns. D) humans have 46 chromosomes.