Which element is most likely to share electrons with other atoms in joint orbitals?
a. chlorine (7 valence electrons)
b. calcium (2 valence electrons)
c. argon (8 valence electrons)
d. carbon (4 valence electrons)
e. potassium (1 valence electron)
ANSWER: d
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In a nucleosome, the DNA is wrapped around _____
A) polymerase molecules B) ribosomes C) histones D) a thymine dimer E) satellite DNA
The SOS regulatory system is activated by
A) the activity of DNA polymerase IV. B) DNA damage. C) transcription of LexA. D) repression of RecA.
Parvoviruses are among the simplest known DNA viruses of animals.
Answer the following statement true (T) or false (F)
In a prokaryotic cell, all of the following are functions of a capsule EXCEPT:
a. attachment to environment surfaces b. attachment to body tissues c. protection from phagocytosis d. movement