Enzymes


Moderators: Chem_Mod, Chem_Admin

Hector Acosta Discussion 1H
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

Enzymes

Postby Hector Acosta Discussion 1H » Fri Mar 09, 2018 4:08 pm

I know enzymes and catalysis make the activation energy lower, which makes the rate faster. But why and how do they do this? And can someone give an example.

Victoria Draper 1G
Posts: 52
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 1 time

Re: Enzymes

Postby Victoria Draper 1G » Fri Mar 09, 2018 6:39 pm

Enzymes are proteins functioning as catalysts that speed up reactions by lowering the activation energy. A simple and succinct definition of an enzyme is that it is a biological catalyst that accelerates a chemical reaction without altering its equilibrium. Amylase is an example of an enzyme that breaks down starches into sugars.

Phi Phi Do 2E
Posts: 27
Joined: Fri Sep 29, 2017 7:05 am

Re: Enzymes

Postby Phi Phi Do 2E » Sun Mar 11, 2018 1:08 am

enzymes generally lower the activation energy because it would decrease the energy barrier that needs to be overcome in order for the reaction to begin. Thehrefore, because enzymes increase reaction rate, the activation energy is lowered for it to do so.

Cyianna 2F
Posts: 34
Joined: Wed Nov 16, 2016 3:04 am

Re: Enzymes

Postby Cyianna 2F » Sun Mar 11, 2018 9:25 pm

Right, enzymes are a type of catalyst that lower activation energy so the rate is faster.

K Stefanescu 2I
Posts: 68
Joined: Fri Sep 29, 2017 7:04 am

Re: Enzymes

Postby K Stefanescu 2I » Sun Mar 11, 2018 10:11 pm

This is a very basic model of an enzyme in action: https://www.youtube.com/watch?v=V4OPO6JQLOE (It's a short video and has pretty nifty animation.)
This demonstrates one way that enzymes can lower the activation energy, in this case by bringing the substrates together in the correct orientation so they can react more readily.
Other methods of decreasing activation energy include distorting substrate bonds or providing/acting on the substrate(s) using a completely different pathway that happens to have a lower activation energy.

Chris Lamb 1G
Posts: 58
Joined: Fri Jun 23, 2017 11:39 am

Re: Enzymes

Postby Chris Lamb 1G » Mon Mar 12, 2018 10:22 am

We learned about mechanisms earlier. Some enzymes (maybe even all enzymes) lower the energy by creating a different mechanism for the reaction. This new mechanism has a smaller energy barrier.

Rana YT 2L
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

Re: Enzymes

Postby Rana YT 2L » Sun Mar 18, 2018 12:12 am

the most basic understanding is that enzymes make the reaction faster by providing a different pathway in which the activation energy is lower

Jason Ye 2I
Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

Re: Enzymes

Postby Jason Ye 2I » Fri Mar 08, 2019 2:18 pm

Enzymes have activation sites that fit substrates in and make reactions faster.

Carine Tamamian 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am

Re: Enzymes

Postby Carine Tamamian 2B » Fri Mar 08, 2019 7:24 pm

Enzymes lower the activation energy.


Return to “*Enzyme Kinetics”

Who is online

Users browsing this forum: No registered users and 1 guest