GCSE Biology: Enzymes

GCSE OCR Biology: B1.2 What happens in cells?

All resources for B1.2 What happens in cells? GCSE OCR Biology Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Each PowerPoint is a whole lessons included with student activities and animated answers. * DNA stands for deoxyribonucleic acid. * DNA is found in the nucleus of cells. * DNA is packaged into a thread-like structure called chromosomes. * Humans typically have 46 chromosomes shared from their parents. * Genes are sections of DNA that code for physical characteristics. * The structure of DNA. * DNA is comprised of monomers called nucleotides. * A nucleotide consists of a phosphate group, a sugar (deoxyribose), and an organic base. * There are four organic bases: Adenine, A. Thymine, T. Cytosine, C. Guanine, G. * Hydrogen bonds in DNA. * The role of proteins and AI * Proteins as polymers * Explaining transcription * mRNA and complementary bases * Explaining translation * Enzymes are made of protein. * Enzymes are biological catalysts. * Catalysts speed up the rate of reaction without being used up themselves. * Enzymes and the lock and key hypothesis. * Enzymes breaking down and bonding substrates. * Enzymes-catalysed reactions * Rate of reaction * Denaturing of enzymes and the active site * Optimum temperature and optimum pH for enzymes * Definition of concentration * Increasing concentration of enzymes and substrates * Saturation of substrates