Which the following is false about the tertiary structure of DNA:____
A. Kink of the chain
B. Supercoil
C. Loops formed within a single strand of DNA
D. Concatenated circle in circular DNA
E. Double helix of DNA
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Which of the following is correct about the nitrogen bases in DNA: ____
A=G, C=T
B. The composing and ratio of bases in DNA is different in different organisms.
C. The composing and ratio of bases in DNA is different in different organs of one organism.
D. The composing of bases in DNA is constant with the age increase.
E. Uracil is included in DNA.
Which of the following is right about the double helix structure of DNA: ____
A=T
B. Nitrogen bases face the inside of double helix in DNA.
C. 10bp per turn, the pitch is 3.4nm in double helix.
D. Horizontally, DNA stability is maintained by hydrogen bond between base pairs.
E. Vertically, DNA stability is maintained by base stacking force.
The force contributing to DNA stability mainly include: ____
A. phosphodiester
B. hydrogen bond between base pairs
C. base stacking force
D. the support of phosphate backbone
E. the repulsive force of negatively charged phosphate backbone
Which of the following is false about the structure of nucleic acid: ____
A. There are major and minor grooves in the surface of double helix.
Base stacking force exists between neighboring base pairs in double helix DNA.
C. Double helix structure only exist in DNA.
Double helix structure can also exist in RNA.
E. Complementary base pairing exist in double helix.
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