A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if the DNA is denatured by heat?
A. Lk will increase.
B. Lk will decrease.
C. Lk will stay the same.
D. Lk becomes undefined.
E. None of these choices is correct.
C
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At rest, neurons exhibit a negative membrane potential. This is most DIRECTLY due to
A. movements of negatively charged proteins and nucleic acids across the membrane. B. passive leakage of Na+ions across the membrane. C. passive leakage of K+ions across the membrane. D. movement of Na+ ions through voltage-gated Na+ channels. E. movement of K+ ions through voltage-gated K+ channels.
Which of the following does NOT occur in the first
trimester during human development? a. formation of a heart b. disappearance of the tail c. formation of internal organs d. detection of movement of the fetus e. segmentation and development of somites
Transgenic viruses are
a. highly deadly viruses that cause diseases. b. mutated viruses that evade antibodies. c. harmless genetically engineered viruses. d. variations on original virus forms. e. viruses that do not impart immunity.
How many molecules of water are used to completely hydrolyze a polymer that is 11 monomers long?
A) 12 B) 11 C) 10 D) 9