Which of the following statements about the Watson-Crick DNA double helix structure model is wrong（）
A. The direction of the two single chains is anti-parallel
Base A and G pair
Covalent bonding between bases
D. The pentose phosphate backbone is located inside the double helix
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The factors that affect the Tm value are（）
A. The longer the nucleic acid molecule under certain conditions, the larger the Tm value
B. The content of G and C in DNA is high, the Tm value is high
C. Solution has high ionic strength, Tm value is high
D. High content of A and T in DNA, high Tm value
After double-stranded DNA thermal denaturation（）
A. Decrease in viscosity
B. Decrease in sedimentation coefficient
C. Decrease in buoyancy density
Decrease in UV absorption
The key parts of storing and transmitting genetic information in nucleic acid molecules are（）
A. Nucleoside
B. Pentose
C. Phosphate
D. Base sequence
The main contents of the biochemistry course include（）
A. Chemical composition of organisms
B. Metabolism of substance and energy
C. Information metabolism
D. Laws of genetics
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