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.
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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.
Basically, the primary structure of a nucleic acid is: ____
A. the sequence of bases in the polynucleotide chain
B. the way of bases pairing in the polynucleotide chain
C. the ratio of bases in the polynucleotide chain
D. the way of coiling and folding in the polynucleotide chain
E. the linkage between groups in polynucleotide chain
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