OCR A Level Biology:复习笔记2.2.17 Chromatography
Chromatography Chromatography is a technique that can be used to separate a mixture into its individual components Chromatography relies on differences in the solubility of the different chemicals ...
CIE IGCSE Biology: 复习笔记：5.1.1 Enzymes
CIE IGCSE Biology: 复习笔记：5.1.1 Enzymes What Are Enzymes? Enzymes are: Catalysts that speed up the rate of a chemical reaction without being changed or used up in the reaction Proteins Biologica...
OCR A Level Biology:复习笔记2.2.16 Finding the Concentration of a Substance
Finding the Concentration of a Substance Benedict’s solution can be used to carry out a semi-quantitative test on a reducing sugar solution to determine the concentration of reducing sugar present ...
CIE IGCSE Biology: 复习笔记：4.1.3 DNA Structure: Extended
CIE IGCSE Biology: 复习笔记：4.1.3 DNA Structure: Extended Structure of a DNA Molecule: Extended DNA, or deoxyribonucleic acid, is the molecule that contains the instructions for growth and develop...
OCR A Level Biology:复习笔记2.2.15 Biochemical Tests: Proteins
Biochemical Tests: Proteins The Biuret test can be carried out quickly and easily in a lab to determine if a sample contains proteins Biuret ‘reagent’ contains an alkali and copper (II) sulfate whi...
CIE IGCSE Biology: 复习笔记：4.1.2 Food Tests
CIE IGCSE Biology: 复习笔记：4.1.2 Food Tests Food Tests Test for glucose (a reducing sugar) Add Benedict's solution into sample solution in test tube Heat at 60 - 70 °c in water bath for 5 minutes...
OCR A Level Biology:复习笔记2.2.14 Inorganic Ions
Inorganic Ions An ion is an atom (or sometimes a group of atoms) that has an electrical charge An ion that has a +ve charge is known as a cation An ion that has a -ve charge is known as an anion &n...
OCR A Level Biology:复习笔记2.2.13 Fibrous Proteins
Fibrous Proteins Fibrous proteins are long strands of polypeptide chains that have cross-linkages due to hydrogen bonds These proteins have little or no tertiary structure Due to a large number of ...
2022 AMC10/12B卷即将开考，考前注意事项和答题策略了解一下！
AMC10/12 A卷考试已结束，距离B卷考试开始仅有1天的时间，相信不少考生已经进入考前冲刺阶段了。我们为同学们整理了一些AMC考前的常见问题及注意事项，希望能够帮助大家，考前冲刺之余也不要忘记做好各种准备工作...
OCR A Level Biology:复习笔记2.2.12 Globular Proteins
Globular Proteins Globular Globular proteins are compact, roughly spherical (circular) in shape and soluble in water Globular proteins form a spherical shape when folding into their tertiary struct...
OCR A Level Biology:复习笔记2.2.11 Protein: Structure
Levels of Protein Structure There are four levels of structure in proteins, three are related to a single polypeptide chain and the fourth level relates to a protein that has two or more polypeptid...
OCR A Level Biology:复习笔记2.2.10 Amino Acids & Peptide Bonds
Amino Acids Proteins Proteins are polypeptides (and macromolecules) made up of monomers called amino acids The sequence, type and number of the amino acids within a protein determines its shape and...
