Mutations A?gene mutation?is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide Mutations occur?continuously?and?spontaneously Errors in the DNA ofte...
DNA Replication Before?a (parent) cell?divides, it needs to?copy the DNA?contained within it Doubling the DNA?ensures that the two new (daughter) cells produced will both receive?full copies of the...
Practical: Investigating the Effect of Enzyme and Substrate Concentrations Enzyme concentration Enzyme concentration affects the rate of reaction The?higher?the?enzyme concentration?in a reaction m...
Mode of Enzyme Action Enzymes are?globular proteins This means their?3D?shape?(as well as the shape of the?active site?of an enzyme) is determined by the complex tertiary structure of the protein t...
Enzymes as Catalysts Enzymes are?biological catalysts ‘Biological’ because they function in?living systems ‘Catalysts’ because they?speed up the rate of chemical reactions?without being?used up?or ...
Fibrous Proteins: Structure & Function Structure Fibrous proteins?are long strands of polypeptide chains that have cross-linkages due to hydrogen bonds These proteins have little or no tertiary...
Globular Proteins: Structure & Function Structure Globular proteins?are Compact Roughly?spherical?(circular) in shape Globular proteins form a spherical shape when folding into their tertiary s...
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...
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...
