The secondary structure of DNA is: ____
A. α- helix
B. β- sheet
C. β- turn
D. double helix
E. random coli
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Which is the main form of DNA naturally: ____
A-DNA
B-DNA
C. E-DNA
D. Z-DNA
E. None of above.
About the secondary structure of DNA, which one is false: ____
A. Three hydrogen bonds are formed between A and T, two hydrogen bonds are formed between G and
B. Nitrogen base groups face the inside of double helix in DNA.
C. There is base stacking force between base pairs.
D. Two strands are oppositely oriented.
E. There are major and minor grooves in the surface of double helix.
The linkage between five-carbon sugar (shorted as R), bases (shorted as N) and phosphate (shorted as P) in a nucleic acid is: ____
A. N-R-P
B. N-P-R
C. P-N-R
D. R-N-P
E. R-P-N
Which of the following is not included in DNA:____
A. dAMP
B. dGMP
C. dCMP
D. dUMP
E. dTMP
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