题目内容

Which of the following is true about the composition of DNA bases ()

A. DNA is mainly composed of four bases: A, G, C and U
B. In DNA, (A+T)/(C+G) = (A+C)/(G+T).
C. In DNA, (A+G)/(T+C) =1
D. The base composition of DNA is species-specific and organ-specific
E. none of the above

查看答案

搜索结果不匹配？点我反馈

更多问题

The secondary structure of DNA is ( )

A. α-helix
B. Β-pleated sheet
C. Β-turn
D. supercoil
E. double helix

查看答案

the analogue of sulfonamides is ( )

A. FH4
B. FH2
C. para-amino –benzoic acid
D. folic acid
E. pyrimidine

查看答案

Lactate dehydrogenase isoenzymes are composed of H and M subunits( )

A. dimer
B. trimer
C. tetramer
D. pentamer
E. hexamer

查看答案

The most common type of chemical modification is ( )

A. Phosphorylation and dephosphorylation,
B. acetylation and deacetylation
C. methylation and demethylation
D. adenylation and deadenylation
E. -SH and –S-S interconversion

查看答案

Which of the following is true about the composition of DNA bases ()

A. DNA is mainly composed of four bases: A, G, C and U B. In DNA, (A+T)/(C+G) = (A+C)/(G+T). C. In DNA, (A+G)/(T+C) =1 D. The base composition of DNA is species-specific and organ-specific E. none of the above

The secondary structure of DNA is ( )

the analogue of sulfonamides is ( )

Lactate dehydrogenase isoenzymes are composed of H and M subunits( )

The most common type of chemical modification is ( )

A. DNA is mainly composed of four bases: A, G, C and U
B. In DNA, (A+T)/(C+G) = (A+C)/(G+T).
C. In DNA, (A+G)/(T+C) =1
D. The base composition of DNA is species-specific and organ-specific
E. none of the above