Summary
Summary C3 ENZYMES 9700
- Course
- Institution
- Book
SUMMARIZED NOTES BY A-STUDENT
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
More summaries for
-
PHOTOSYNTHESIS
-
Biology AS Best summary notes
-
Cell structure_ A level
Seller
Follow
bhipeshs
Content preview
Chapter 3: EnzymesMonday, 25 April 2022 7:58 PM
ENZYMES AS PROTEINS
Enzymes are biological catalysts - function in living organism and speed up rate of chemical reaction without being used
up
Globular protein
Contain an active site - where the substrate binds
Can be intracellular (produced and function inside the cell) or extracellular (secreted by cell and catalyse reaction outside
the cell)
MODE OF ENZYME ACTION
Substrate binds to the active site forming an enzyme-substrate complex
Active site has a specific shape to the substrate
Extreme temperature / pH can denature the enzyme
Specificity of the enzyme is due to its complementary nature between shape of active site and substrate
Shape of active site is determined by complex tertiary structure of the protein that makes enzyme
Enzyme reactions can either be anabolic / catabolic (Catabolic involves breakdown of complex molecules into simpler
products eg cellular respiration and hydrolysis) (Anabolic involves building of more complex molecules from simpler one
eg protein synthesis and photosynthesis)
ENZYMES WORK BY LOWERING ACTIVATION ENERGY OF REACTION
Activation energy - amount of energy needed by the substrate to just become unstable enough and for products to be
formed
Enzymes speed up chemical reactions because they influence the stability of bonds in the reactants
The destabilisation of bonds in the substrate makes it more reactive
Enzymes work by lowering the activation energy of a reaction and in doing so they provide an alternative energy pathwa
HOW ENZYMES WORK?
LOCK-AND-KEY HYPOTHESIS
It was suggested that enzyme and substrate were rigid structures that locked into each other very precisely, like a lock in a
key. This was known as 'lock-and-key hypothesis'
INDUCED-FIT HYPOTHESIS
AS BIOLOGY NOTES Page 1
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller bhipeshs. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.79. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75759 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now