题目内容

which force make DNA double helix stable? ( )

A. hydrogen bond
B. base stacking force
C. peptide bond
D. disulfide bond
E. all above is wrong

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coupling sites for generation of ATP in respiratory chain include ( )

A. NADH→CoQ
B. cyt C→cytaa3
C. cytaa3→O2
D. CoQ→ cyt C
E. FAD→CoQ

Basic rules in replication include ( )

A. semi-conservative
B. semi-discontinuous
C. bidirectional
D. asymmetric
E. all the above

The cofactors of Pyruvate dehydrogenase complex include ( )

A. TPP
B. FAD
C. lipoic acid
D. NAD+
E. CoA

the features of codon include :()

A. directional
B. non-punctuated
C. degenerate
D. wobble
E. universal