DNA Replication Before?a (parent) cell?divides, it needs to?copy the DNA?contained within it Doubling the DNA?ensures that the two new (daughter) cells produced will both receive?full copies of the...
Practical: Investigating the Effect of Enzyme and Substrate Concentrations Enzyme concentration Enzyme concentration affects the rate of reaction The?higher?the?enzyme concentration?in a reaction m...
Mode of Enzyme Action Enzymes are?globular proteins This means their?3D?shape?(as well as the shape of the?active site?of an enzyme) is determined by the complex tertiary structure of the protein t...
Enzymes as Catalysts 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 ...
Fibrous Proteins: Structure & Function Structure Fibrous proteins?are long strands of polypeptide chains that have cross-linkages due to hydrogen bonds These proteins have little or no tertiary...
Globular Proteins: Structure & Function Structure Globular proteins?are Compact Roughly?spherical?(circular) in shape Globular proteins form a spherical shape when folding into their tertiary s...
Levels of Protein Structure There are?four?levels of structure in proteins Three are related to a single polypeptide chain The fourth level relates to a protein that has two or more polypeptide cha...
Amino Acid: Structure Proteins Proteins are polymers (and macromolecules) made of monomers called?amino acids The sequence, type and number of the amino acids within a protein determines its shape ...
Nature of the Genetic Code The triplet code The sequence of DNA nucleotide bases found within a gene is determined by a?triplet?(three-letter)?code Each sequence of?three bases?(i.e. each triplet o...
