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?...
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...
