如题所述
第1个回答 2022-10-11
DNA四大天王－A、G、T、C DNA是很长的分子链，由四种盐基组成，分别是腺嘌呤（A
adenine）、鸟粪嘌呤（G
guanine）、胞嘧啶（C
cytosine）及胸线嘧啶（T
thymine）。每一对盐基不是 A
T就是G
C。在DNA的两条链结合 时，A必定和T结合，G必定和C结合，其他的组合无法衔接这两条锁链。因为A和T是 由两个氢链所连结，G和C之间的结合则须有三个氢键。在RNA中，胸腺嘧啶（T）则由嘧啶（Uracil，U）所取代 purine A double-ringed
crystalline anic base
C5H4N4
not known to occur naturally
from which is derived the nitrogen bases adenine and guanine
as well as uric acid as a metabolic end product. Any of a group of anic pounds structurally related to purine
particularly adenine and guanine
and also caffeine
uric acid
theobromine
and theophylline.A heterocyclic anic pound containing fused pyrimidine and imidazole rings. A number of substituted purine derivatives occur in nature; some
as ponents of nucleic acids and coenzymes
play vital roles in the geic and metabolic processes of all living ani *** s. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE557800SX0010 pyrimidine A single-ringed
crystalline anic base
C4H4N2
that forms uracil
cytosine
or thymine and is the parent pound of many drugs
including the barbiturates. A heterocyclic anic pound containing nitrogen atoms at positions 1 and 3. Naturally occurring derivatives of the parent pound are of considerable biological importance as ponents of nucleic acids and coenzymes and
in addition
synthetic members of this group have found use as pharmaceuticals. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0010 adenine 7H-purin-6-amine A purine base
C5H5N5
that is the constituent involved in base pairing with thymine in DNA and with uracil in RNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE557800SX0020 图片参考：content.wers/main/content/wp/en-mons/thumb/5/51/116px-Adenine_chemical_structure guanine 2-amino-1H-purin-6(9H)-one 2-amino-6-oxo-purine A purine base
C5H5ON5
that is an essential constituent of both RNA and DNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE557800SX0030 图片参考：content.wers/main/content/wp/en-mons/thumb/1/10/200px-Guanine_chemical_structure cytosine 4-amino-3H-pyrimidin-2-one A pyrimidine base
C4H5N3O
that is the constituent of DNA and RNA involved in base pairing with guanine. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0030 图片参考：content.wers/main/content/wp/en-mons/thumb/d/d7/120px-Cytosine_chemical_structure thymine 5-Methylpyrimidine-2
4(1H
3H)-dione A pyrimidine base
C5H6N2O2
that is an essential constituent of DNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0040 图片参考：content.wers/main/content/wp/en/thumb/c/cd/200px-Thymine uracil Pyrimidine-2
4(1H
3H)-dione 2
4-dihydroxypryimidine A pyrimidine base
C4H4N2O2
that is an essential constituent of RNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0020 图片参考：content.wers/main/content/wp/en-mons/thumb/2/2e/102px-Uracil_chemical_structure I hope this can help your understanding. :)
参考: My knowledge
adenine）、鸟粪嘌呤（G
guanine）、胞嘧啶（C
cytosine）及胸线嘧啶（T
thymine）。每一对盐基不是 A
T就是G
C。在DNA的两条链结合 时，A必定和T结合，G必定和C结合，其他的组合无法衔接这两条锁链。因为A和T是 由两个氢链所连结，G和C之间的结合则须有三个氢键。在RNA中，胸腺嘧啶（T）则由嘧啶（Uracil，U）所取代 purine A double-ringed
crystalline anic base
C5H4N4
not known to occur naturally
from which is derived the nitrogen bases adenine and guanine
as well as uric acid as a metabolic end product. Any of a group of anic pounds structurally related to purine
particularly adenine and guanine
and also caffeine
uric acid
theobromine
and theophylline.A heterocyclic anic pound containing fused pyrimidine and imidazole rings. A number of substituted purine derivatives occur in nature; some
as ponents of nucleic acids and coenzymes
play vital roles in the geic and metabolic processes of all living ani *** s. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE557800SX0010 pyrimidine A single-ringed
crystalline anic base
C4H4N2
that forms uracil
cytosine
or thymine and is the parent pound of many drugs
including the barbiturates. A heterocyclic anic pound containing nitrogen atoms at positions 1 and 3. Naturally occurring derivatives of the parent pound are of considerable biological importance as ponents of nucleic acids and coenzymes and
in addition
synthetic members of this group have found use as pharmaceuticals. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0010 adenine 7H-purin-6-amine A purine base
C5H5N5
that is the constituent involved in base pairing with thymine in DNA and with uracil in RNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE557800SX0020 图片参考：content.wers/main/content/wp/en-mons/thumb/5/51/116px-Adenine_chemical_structure guanine 2-amino-1H-purin-6(9H)-one 2-amino-6-oxo-purine A purine base
C5H5ON5
that is an essential constituent of both RNA and DNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE557800SX0030 图片参考：content.wers/main/content/wp/en-mons/thumb/1/10/200px-Guanine_chemical_structure cytosine 4-amino-3H-pyrimidin-2-one A pyrimidine base
C4H5N3O
that is the constituent of DNA and RNA involved in base pairing with guanine. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0030 图片参考：content.wers/main/content/wp/en-mons/thumb/d/d7/120px-Cytosine_chemical_structure thymine 5-Methylpyrimidine-2
4(1H
3H)-dione A pyrimidine base
C5H6N2O2
that is an essential constituent of DNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0040 图片参考：content.wers/main/content/wp/en/thumb/c/cd/200px-Thymine uracil Pyrimidine-2
4(1H
3H)-dione 2
4-dihydroxypryimidine A pyrimidine base
C4H4N2O2
that is an essential constituent of RNA. 图片参考：content.wers/main/content/img/McGrawHill/Encyclopedia/images/CE558900SX0020 图片参考：content.wers/main/content/wp/en-mons/thumb/2/2e/102px-Uracil_chemical_structure I hope this can help your understanding. :)
参考: My knowledge
