CIE A Level Biology复习笔记3.1.2 Enzyme Action
Mode of Enzyme Action Enzymes have an?active site?where?specific substrates bind?forming an?enzyme-substrate complex The?active site?of an enzyme has a?specific shape?to fit a specific substrate Ex...
CIE A Level Biology复习笔记3.1.1 Enzymes
Enzymes as Proteins Enzymes are?biological catalysts ‘Biological’ because they function in?living systems ‘Catalysts’ because they?speed up the rate of chemical reactions?without being used up or c...
CIE A Level Biology复习笔记2.4.2 The Role of Water in Living Organisms
Water Molecules: In Living Organisms Water has many essential roles in living organisms due to its properties: The?polarity?of water molecules The presence and number of?hydrogen bonds?between wate...
CIE A Level Biology复习笔记2.4.1 Water & the Hydrogen Bond
Water Molecules: Hydrogen Bonds Water is of great biological importance. It is the medium in which all metabolic reactions take place in cells. Between 70% to 95% of the mass of a cell is water As ...
CIE A Level Biology复习笔记2.3.6 Collagen
The Molecular Structure of Collagen Collagen?is the most common?structural?protein found in vertebrates In vertebrates it is the component of?connective tissue?which forms: Tendons Cartilage Ligame...
CIE A Level Biology复习笔记2.3.5 Haemoglobin
The Molecular Structure of Haemoglobin Structure Haemoglobin is a?globular?protein which is an oxygen-carrying pigment found in vast quantities in red blood cells It has a?quaternary?structure as t...
CIE A Level Biology复习笔记2.3.4 Globular & Fibrous Proteins
Proteins: Globular & Fibrous Globular Globular proteins?are?compact, roughly?spherical?(circular) in shape and?soluble?in water Globular proteins form a spherical shape when folding into their ...
CIE A Level Biology复习笔记2.3.3 Protein Shape
Proteins: Interactions & Shape A polypeptide chain will fold differently due to the interactions (and hence the bonds that form) between?R groups. The three-dimensional configuration that forms...
CIE A Level Biology复习笔记2.3.2 The Four Levels of Protein Structure
Proteins: Structures 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 polypeptide chain...
