S 3 Biology Enzymes What are synthesis reactions

S 3 Biology Enzymes What are synthesis reactions?

Recap �Classroom reporter from last lesson select name/number to recap what was learned last lesson

What are we learning today? We are learning to: �Describe what is meant by a synthesis reaction �Recognise a synthesis reaction in diagrammatic form �State the name of an enzyme involved in a synthesis reaction Success criteria: �Synthesis – small molecules joined to make larger molecule �Phosphorylase enzyme synthesises starch from glucose – 1 phosphate

What are synthesis reactions? �In some reactions, enzymes are used to build large molecules out of small molecules. �When enzymes are used to build things up it is called SYNTHESIS

An example of a synthesis reaction �In this SYNTHESIS reaction the enzyme phosphorylase builds up starch from glucose molecules. phosphorylase glucose starch

Experiment You are going to use the enzyme phosphorylase to produce starch from glucose -1 -phosphate 1. Collect a dimple tile, three dropping pipettes and one of each of the vials containing phosphorylase, glucose-1 -phosphate and water 2. Label dimple tile as follows 0 Row 1 Glucose-1 -phosphate and phosphorylase Row 2 Glucose-1 -phosphate and water Row 3 Phosphorylase and water 4 8 12

Conclusions �In row 1 starch was synthesised from glucose-1 phosphate �- in the presence of the enzyme phosphorylase �In row 2 there was no reaction �– starch was not produced because phosphorylase was absent �In row 3 there was no reaction �– starch was not produced because the glucose-1 phosphate was absent

Summary �Stand deliver �All group members have to be able to state the substrate, enzyme and product of the synthesis reaction before they can sit down