Login

Join for Free!
118898 members


Activation energy

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

Moderator: BioTeam

Re: Activation energy

Postby Edher » Sun Feb 13, 2005 8:17 pm

thank.darwin wrote:I know what activation energy is and what it does but my question is - can activation energy be anything? (I know it can't be anything but what are the different kinds of activation energy?)


Saludos,

I just finished reading the section about activation energy and my textbook highlights that usually activation energy is thermal energy.

"Activation energy is often supplied in the form of heat that the reactant molecules absorb from the surroundings. The bonds of the reactants break only when the molecules have absorbed enough energy to become unstable and are therefore more reactive. The absorption of thermal energy increases the speed of the reactant molecules, so they collide more often and more forcefully. Also, thermal agitation of the atoms in the molecules makes the bonds more likely to break."

Biology 7th edition - Campbell and Reece

Edher
Edher
Garter
Garter
 
Posts: 37
Joined: Sat Jan 29, 2005 6:19 pm

Postby Edher » Sun Feb 13, 2005 8:47 pm

Furthermore, in biological systems high temperatures would harm the cell more than it would aid it. High temperatures kill cells and denatures proteins. That's why enzymes exist. They lower the amount of Activation Energy needed. This means that it lowers the amount of heat needed to activate a reaction. Therefore, reactions can still be executed within the cell at moderate temperatures.

Edher
Edher
Garter
Garter
 
Posts: 37
Joined: Sat Jan 29, 2005 6:19 pm

Postby thank.darwin » Mon Feb 14, 2005 5:04 pm

Thank-you Edher - I'm also in a high school biology class - we just finished a unit on enzymes and energy carriers; I just didn't know what the different types of activation energy were... thank-you
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
-Albert Einstein
User avatar
thank.darwin
Inland Taipan
Inland Taipan
 
Posts: 347
Joined: Thu Jan 27, 2005 7:39 pm
Location: Vancouver, Canada


Previous

Return to Molecular Biology

Who is online

Users browsing this forum: No registered users and 1 guest