集美们，你是否还在为A-Level的生物复习而苦恼？今天小编就给大家分享一下复习干活！
Nucleic Acids 和 Protein synthesis 一直是A-Level的重点章节，也是老师我常常被同学们提问的地方。下面是我为我的学生们做的一份文蓝内部复习资料，在考试期间放出来给各位同学，希望能帮助到大家！
Part 1 ：Nucleic Acids
DNA is the genetic material, which carries the genetic information.
Chromosome is a DNA molecule associate with the histone proteins.
Gene is the small section of DNA, which can be used to make the proteins.
■ DNA
- Deoxyribonucleic acids
- Double helix structure with antiparallel strands。
- DNA is the polymer of DNA nucleotides (Polynucleotides)
■ RNA
- Ribonucleic Acids
- Made up by RNA nucleotides.
- Messenger RNA: Copy the genetic information from DNA in the nucleus and bring the information to the ribosome in cytoplasm.
- Transfer RNA: Carry the specific amino acid to the ribosome.
- Ribosomal RNA: Form the subunits of the ribosome.
l Nucleotide contains a pentose sugar, a phosphate group and a nitrogen-containing base:
■ Each nucleotide is linked to the next one by phosphodiester bonds between the phosphates of a nucleotide and pentose of another nucleotide to form the polynucleotide.
■ Commentary base pairing: purine bases pair with pyrimidine bases (A-T, G-C)
- Adenine always pairs with thymine (uracil in RNA) via 2 hydrogen bonds.
- Guanine always pairs with cytosine via 3 hydrogen bonds.
■ Two polynucleotide strands of the DNA is held by the hydrogen bonds between the complementary base pairing.
以上就是新航道重庆小编给大家分享的关于A-Level生物的相关内容。如果大家想要了解更多或者有任何疑问，欢迎联系新航道重庆学校。
新航道重庆学校官网：cq.xhd.cn
新航道重庆学校电话：400-185-9090
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