CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.2 Enzyme Investigations Investigating the Effect of Temperature on Amylase Starch solution?is heated to a set temperature Iodine?is added to wells of a spotting til...
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: 復(fù)習(xí)筆記：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...
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: 復(fù)習(xí)筆記：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...
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: 復(fù)習(xí)筆記：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...
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...
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?...
AMC10/12 A卷考試已結(jié)束，距離B卷考試開始僅有1天的時(shí)間，相信不少考生已經(jīng)進(jìn)入考前沖刺階段了。我們?yōu)橥瑢W(xué)們整理了一些AMC考前的常見問題及注意事項(xiàng)，希望能夠幫助大家，考前沖刺之余也不要忘記做好各種準(zhǔn)備工作...
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...
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...
