2023AP考試報名，香港今日截止，韓國倒計時，新加坡第二輪開啟！
重要消息！重要消息！ 香港AP考試報名今日截止 韓國即將于11月8日截止 新加坡第二輪AP報名已開啟 香港考區新增考位，今日截止報名 香港考場于10月31日新增7門科目報考名額，還沒有搶到考位的同學和家長抓緊最后的...
Edexcel A (SNAB) A Level Biology:復習筆記2.3.5 Levels of Protein Structure
Levels of Protein Structure There are?four?levels of structure in proteins Three are related to a single polypeptide chain The fourth level relates to a protein that has two or more polypeptide cha...
Edexcel A (SNAB) A Level Biology:復習筆記2.3.4 Amino Acids & Peptide Bonds
Amino Acid: Structure Proteins Proteins are polymers (and macromolecules) made of monomers called?amino acids The sequence, type and number of the amino acids within a protein determines its shape ...
Edexcel A (SNAB) A Level Biology:復習筆記2.3.3 Nature of the Genetic Code
Nature of the Genetic Code The triplet code The sequence of DNA nucleotide bases found within a gene is determined by a?triplet?(three-letter)?code Each sequence of?three bases?(i.e. each triplet o...
Edexcel A (SNAB) A Level Biology:復習筆記2.3.2 Translation
Translation Translation occurs?in the cytoplasm?of the cell After leaving the nucleus via a nuclear pore, the?mRNA molecule attaches to a ribosome In the cytoplasm there are?free molecules of tRNA?...
Edexcel A (SNAB) A Level Biology:復習筆記2.3.1 Transcription
Transcription A?gene?is a?sequence of nucleotide bases?in a DNA molecule that?codes for the production of a specific sequence of amino acids, that in turn make up a?specific polypeptide?(protein) T...
Edexcel A (SNAB) A Level Biology:復習筆記2.2.3 RNA: Structure
RNA: Structure Like DNA, the nucleic acid RNA (ribonucleic acid) is a?polynucleotide?– it is made up of?many nucleotides?linked together in a chain Like DNA, RNA nucleotides contain the nitrogenous...
Edexcel A (SNAB) A Level Biology:復習筆記2.2.2 DNA: Structure
DNA: Structure The nucleic acid DNA is a?polynucleotide?– it is made up of?many nucleotides?bonded together in a?long chain DNA nucleotide DNA molecules are made up of?two polynucleotide str...
Edexcel A (SNAB) A Level Biology:復習筆記2.2.1 Nucleotides & Phosphodiester Bonds
Mononucleotides: Structure Both DNA and RNA are?polymers?that are made up of?many repeating units?called?nucleotides Each nucleotide is formed from: A?pentose sugar?(a sugar with 5 carbon atoms) A ...
