The lac operon

- Recap of types of genetic mutation
- Definition of "operon" as "a cluster of genes under the control of a single promoter"
- Definition of promoter as "a region of DNA near the start of a coding sequence where RNA polymerase can bind to begin transcription"

- Introduction of the need for the lac operon in E.coli (usually respires using glucose so it would be wasteful to express necessary genes all the time, genetic switch required to facilitate detection of lactose followed by expression of necessary genes
- Discussion of the role of lactose permease (transport protein) and beta-galactosidase (hydrolyses the disaccharide)

HOMEWORK - get completed PLCs emailed in AND revise this topic for mini test Thursday

Comments

Post a Comment

Popular posts from this blog

Lesson 4 summary - Limiting factors

Image
- Whiteboard recap of key words relating to light dependent stage - Whiteboard recap of light independent stage including the terms "carbon fixation step" - Analysis of graphs showing the relative abundances of GP and TP in light and dark conditions: - GP increases because the conversion of GP to TP requires the products of the light dependent reactions - The carbon fixation step DOES NOT require these products and hence the levels of RuBP drop Photosynthetic pigments - Explanation of the need for additional photosynthetic pigments using the idea of red seaweed as an example Limiting Factors - Identification of temperature, light intensity and carbon dioxide concentration as the main limiting factors of photosynthesis MINI TEST TOPIC - Classification and Evolution
Read more

Lesson 1 summary

Image
Topics covered today: - GCSE photosynthesis recap including key words - Structure of a chloroplast - The light dependent stage of photosynthesis including location and products HOMEWORK - complete the table comparing cyclic and non-cyclic photophosphorylation AND read up on the processes so you are ready to discuss and answer questions. MINI QUIZ TOPIC FOR NEXT LESSON - ENZYMES!
Read more