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
查看答案
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
Which of the following is false about the double helix structure of DNA: ____
A. DNA consist of two anti-parallel strands.
B. Nitrogen bases are strictly paired in double helix.
C. The sugar and phosphate groups face outward of double helix.
D. Base plane is perpendicular to the central axis.
E. DNA is found in the right-handed configuration in all organisms.
Which of the following is false about the content of bases in DNA: ____
A+T=C+G
B. A+G=C+T
C. G=C
D. A=T
E. A/T=G/C
微信支付 
支付宝支付