Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account


chemical that (1) increases the rate of a reaction, (2) is not itself changed at the end of the reaction, and )3) does not change the nature of the reaction or its final result.


Protein Catalysts (exception RNA). They lower the activation energy.

Activation Energy

energy required to break chemical bonds

Lock-and-key model

The reactant molecules have specific shapes that allow them to fit into the active site.


The molecule that participates in the reaction

Enzyme's Basic Rules

* Enzymes are specific
* Enzymes are required for reactions to happen
* Enzymes are proteins
* Enzymes can be turned on or off

Almost all enymes end with what letters?



A measure of Kinetic Energy. Energy of motion.

What are the effects of Temperature on a reaction?

An increase in temperature will increase the rate and chance of a reaction.

pH optimum

peak range where activity is most likely to occer


extra "helper" molecule that include metal ions such as Ca2+, Mg2+ and Cu2+


extra "helper" moleceule. Organic molecules that offen times are transporters.


Inactive form of an enzyme


Process of activation of an enzyme


Process of deactivation of an enzyme

Enzymes Turnover

Breakdown and resynthesis of enzymes

Substrate Concentration

The rate of product formation will increase as the substrate concentration increases until the point of saturation


When the relationship between substrate concentration and reaction rate reaches a plateau of maximum velocity. "All enzymes are busy"

Reversible Reaction

Both the forward and backward reactions can be catalzed by the same enzymes.

Metabolic Pathways

The sequence of chemical reactions. Begins with initial substrate, than through a number of intermediates, and ends with the final product.

1st law of Thermodynamics (conservation of energy)

Energy is not created or destroyed - it is transformed

2nd law of Themodynamics

The amount of entropy increase every time enery is transformed. Energy transformations are not perfect, some "lost" as heat.

Endergonic reactions

chemical reactions that require an input of energy

Exergonic reactions

Reactions that convert milescules with more free energy to molecule with less - release energy as they proceed

Coupled Reactions

Use energy from energy releasing reactions (exergonic) to power energy requiring reactions (endergonic)

Oxidation-Reduction Reactions

*Couple reactions where electrons are transfered from one molecule to another
* 1 molecule loses e-
* 1 molecule gains e-
some energy moves with the transfer and some is lost during the transfer.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording