Enzyme video reveiwed

While cramming for subjects, i usually use a couple youtube channels that has concise information about topics. One of my favourite channel is BrightStorm2 which has a range of topics in biology,chemistry,physics and math. The following is a video from their channel on Enzymes:

http://www.youtube.com/watch?v=870MWm0peRI

Summary of the video:

The lecturer talked about enzymes being a protein catalyst, having a substrate specific active site, induced fit theory, and the effect of pH and temperature.

  • Firstly, i thought that the video was concise, but filled with enough information to give you a general idea of Enzymes.
  • His animated voice kept your attention throughout the entire video.
  • The use of a diagram of an Energy vs Time graph on the white board gave you a visual understanding of how enzymes work as a catalyst and lowers activation energy and speeds up the rate of reaction.
  • The use of main points on the white board also gave a visual of the main characteristic of Enzymes that should be known. these main points were also discussed in the video: Protein catalyst, active site, specific to substrate, induced fit theory, pH and temperature.
  • The use of the scissors gave a real life application and therefore better understanding of enzymes being a catalyst and the active site being substrate specific.
  • The use of assistant Laura also gave the video an added touch of familiarity and proved that enzymes act as catalyst and make reactions easier to occur.
  • Diagram of induced fit theory gave a visual, hence better understanding of how the theory works.

 

However, the video can be improved in multiple ways:

  • The video could have been edited so that Laura ripped the paper correctly the first time, proving that enzymes make reactions occur easier.
  • Other topics such as Inhibition, Nomenclature, Enzyme classes, Inorganic catalyst vs biological catalyst, M-M equation, Line-weaver Burk plot and Allosteric enzymes could have been covered. This could have given the video a sense of depth instead of a general idea. In this way, students at university level would find the video very useful.
  • Other graphs such as pH and temperature graphs could have been used.
  • pH and temperature effect on enzymes could have been explained more, instead of simply mentioned.

 

In conclusion, i believe the video is best for cramming purposes, because it give a general sense of Enzymes and their characteristics.

goodbye www.maurilioamorim.com

Enzymes!

Enzymes are biological catalysts that speeds up chemical reactions by providing an alternative pathway with a lower activation energy. Allow me to break down that definition by explaining key words. Catalysts are substances that increases the rate of a reaction without itself being changed in the process. Activation energy is the least amount of energy required for a reaction to occur. Now re-read the first sentence…got it now? great!

 

Enzymes are mostly proteins though some are RNA molecules.

ENZYMES ARE HIGHLY SPECIFIC! ..and yes, i had to use shouty-caps, cause that characteristic is very important to know. The relationship between enzymes and substrates is like a love story:

Just as a girl heart is specific for that one guy..”the one”..an enzyme’s active site is also highly specific.

When that girl meets that perfect guy..they have a relationship..just as the enzyme and substrate forms an enzyme-substrate complex.

Eventually,the guy changes,and turns out to be the person you thought he was, and yall break up…just as the substrate shape changes to form products and the complex is broken.

The enzyme remains unchanged,free to bind with more subtrate while the girl may however be changed.

enz5

http://theewanderingkind.tumblr.com/

LOL slight toat, but anyways, you get the point!

Catalytic Power: the number of molecules of substrate converted to product per enzyme molecule per second is called “turnover number”  or “kcat”

Co-Factors: essential for proper functioning of enzymes.

Non-protein component: can be organic (derived from vitamins) or inorganic (metal ions)

‘Cosubstrates’ are not bound, while ‘Prosthetic groups’ are bound.

Apoenzyme + Cofactor –> Holoenzyme

Active site is formed when proteins undergo complex folding of the amino acid chain,pockets formed by such structures containing a functional group responsible for the reaction forms an active site.

Weak forces of attraction exists between the active site and the substrate.

Biological catalyst are more efficient than Inorganic enzymes which include Fe catalyst for Haber Process and Vanadium (V) Oxide catalyst for contact process.

Graph showing reaction with and without  enzyme present:

enz4

academic.pgcc.edu

Graph showing effect of Temperature, pH and substrate concentration on velocity of enzyme catalyzed reactions:

Image

en.wikibooks.org

Please read Part two of this Enzyme Blog…toodles for now.