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: 复习笔记：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...
CIE IGCSE Biology: 复习笔记：3.1.8 Proteins & Active Transport Importance of Active Transport: Extended Energy is needed because particles are being moved?against a concentration gradient, in t...
CIE IGCSE Biology: 复习笔记：3.1.7 Active Transport Active Transport Active transport is the movement of particles through a cell membrane from a region of?lower concentration?to a region of?higher...
CIE IGCSE Biology: 复习笔记：3.1.5 Osmosis Experiments Osmosis in Plant Tissues When water moves into a plant cell, the vacuole gets bigger,?pushing the cell membrane against the cell wall Water en...
Lipids Lipids Lipids are macromolecules that contain carbon, hydrogen and oxygen atoms. Unlike carbohydrates, lipids contain a lower proportion of oxygen Lipids are?non-polar?and?hydrophobic?(insol...
