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(kāi)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(jiàn)問(wèn)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...
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...
Biochemical Tests: Lipids The?emulsion test?can be carried out quickly and easily in a lab to determine if a sample contains lipids Lipids are?nonpolar?molecules that do not dissolve in water but w...
CIE IGCSE Biology: 復(fù)習(xí)筆記：4.1.1 Chemicals & Life Chemical Elements Most of the molecules in living organisms fall into three categories:?carbohydrates, proteins and lipids These?all contain ...
Lipids: Structure & Function Triglycerides Triglycerides are?fats and oils Fatty acid and glycerol molecules?are the components that make up triglycerides Fats and oils have a number of importa...
