The valence number is the

A. atomic weight.
B. number of neutrons.
C. number of electrons in the innermost orbital.
D. number of electrons in the outermost orbital.
E. number of protons.


Answer: D

Biology & Microbiology

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During DNA replication, the enzyme that unwinds and separates the DNA double-helical molecule is

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When macrophages bind antigens, they secrete ____ to attract more phagocytic cells

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Suppose that a researcher exposes a noninfective form of the bacterium Streptococcus pneumoniae to heat-killed cells of an infective strain. Which process of genetic exchange is most likely to occur between the strains?

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