What happens to lac repressors in E-coli when lactose is present?

This effect takes place when glucose is exhausted and lactose is present: 1. Lactose binds to lac repressors. 2. Bound lac repressors undergo conformational change in shape and detach from the operator (Lac O). 3. The free operator region allows RNA polymerase to bind the promoter region to upregulate (increase) the transcription of Lac Z (Beta-galactosidase) and Lac Y (Lactose permease). 4. The newly synthesised enzymes, Lac Z and Lac Y, metabolise the lactose, providing a negative feedback situation. That’s all!

Ali Rajani

8.2k students helped

Biology Tutor • London

What is Q&A on Scoodle?

At Scoodle we understand that everyone learns in a different way. Some people learn through practice, using essays and notes; others prefer video lessons to watch and learn, some just need help with a specifically hard question, while some learn best 1-on-1 tutoring sessions. At Scoodle we cater for all types of learning styles and needs. From GCSE Maths video lessons to A-level English essays and specialist educators in every subject - we’ve got you covered.

Scoodle has helped over 131,000 students so far

5 Biology tutors available now

Verified

Anshul Raja

ProOnline lessons

Biology tutor, author of two #1 best-selling study guides (40,000 books sold)& BBC Radio Exam Expert

🧬Biology Tutor 📚Author of #1 best-selling books How to ACE Your GCSEs & A-Levels (40,000 copies sold) 🎤 TEDx Speaker 📲 Creator of Yojana - the UK’s first and only personalised study strategy generator (1000+ students use this app each month) 🥇Award Winning Student

£68Per hour

Verified

Cheris Chan

ProOnline lessons

4th year Med student with experience in teaching. Speaks four languages!

Now studying medicine! Has taught as a private tutor and a secondary school teacher. Feel free to ask about university life/ life studying medicine during lessons. I am also an animal lover. GCSE score: 8A* 1A

£25Per hour

Verified

Rachel Dark

ProOnline lessons

A tutor that understands you

Hi, I'm Rachel! I am currently studying Biology as an undergraduate at University College London and have gained a lot of experience tutoring in the subject over the past couple of years. I love the depth and breadth that Biology offers and I would love to share my passion for the subject with others. I believe in tailoring my education to each individual student, as everyone learns slightly differently so it makes sense to have a lesson that is specifically designed for them. I take time in planning my lessons and work with each student to find the harder topics that need a bit more attention. I am more than happy to answer any questions you have!

£18Per hour

275Students helped

Watch video lessons

Verified

Thaddeus Felle

Online lessons

"Fail to prepare, prepare to fail"

I studied at Ampleforth College in North Yorkshire. Here I spent 5 years as a Maths Tutor to my peers and those younger than me. Since then I have privately tutor a variety of subjects from Maths, English, Science, Economics, and much more. This experience has made me adept at interacting with and communicating clearly to those whom I teach. I have experience with AQA, Edexcel, iGCSE and OCR examination boards. I have recently received my MSc in Mental Health & Law from King’s College London (Pass with Merit); and before this a First Class Honours in Philosophy BA. I know exactly what it takes to get a head start in the subjects I tutor. In addition, I have experience teaching children with SEN. GCSE results: -4 a*s -7 a's A-Level results: -Economics-A -Government and Politics-A -Math-A

£22Per hour

397Students helped

Verified

Bayzid Rahman

Chemistry and Biology graduate| GCSE/A level science specialist|Grade booster

I'm currently a science teacher who is exploring private teaching as a viable method for success in our society. Brief history: Bsc Biological Chemistry, Aston University, 2015 (2.1) PGCE Science, Newman University (2018) Now Education, Science teacher (2017- present) Private Tuutor in GCSE science AND A-LEVEL Biology and Chemistry (2017-present)

£25Per hour

697Students helped