enzymes year 10.notebook
1 September 23, 2016
Okt 1213:42
Enzymes as catalysts that speed up reactions.
We are learning
That an enzyme is a biological catalyst that speeds up reactions.
That enzymes end with ...ase.
The enzyme function of protease, lipase and carbohydrase.
That Amylase is an enzyme in your mouth that cuts up starch at the beginning of the digestion process.
Enzymes are specific. They can only work on one type of molecule.
Enzymes can be denatured.
ppt. lesson 2 enzymes.
Okt 1213:50
Enzymes
There are 5 things that we must remember.
The Active site (light grey) Substrate (green) Enzyme (grey)
Enzyme, substrate complex (grey, orange, blue) Products. (blue ) and (orange)
Okt 1213:55
Now label this diagram.
Okt 1215:21
So we now know that enzymes can break molecules up so that they make smaller, more soluble or manageable molecules. But enzymes can also do the opposite. They can stick molecules together to form bigger ones.
Make notes from the power point to explain
Okt 1215:20
An important point about enzymes is that they are very specific about what they can catalyse. Even small changes in the reactant molecule can stop the enzyme from catalysing its reaction. The reason for this lies in the active site present in the enzyme . . .
Active sites
Active sites are cracks or hollows on the surface of the enzyme caused by the way the protein folds itself up into its tertiary structure. Molecules of just the right shape, and with just the right arrangement of attractive groups (see later) can fit into these active sites. Other molecules won't fit or won't have the right groups to bind to the surface of the active site.
The usual analogy for this is a key fitting into a lock. For the key to work properly it has to fit exactly into the lock.
In chemistry, we would describe the molecule which is actually going to react (the purple one in the diagram) as the reactant . In biology and biochemistry, the reactant in an enzyme reaction is known instead as the substrate .
Fill in the missing words on your sheet.
ppt. no messing human organisms. enzymes.
Okt 1216:11
Now we are going to look a little bit more at enzymes that cut up carbohydrates. The enzyme that cuts up carbohydrate is called carbohydrase. We are looking at the carbohydrase called A________?
enzymes year 10.notebook
2 September 23, 2016
Okt 1217:01
Enzymes that cut up proteins are called proteases. Our examples are t__________ and p_________
Okt 1217:00
Bile breaks the fats down in to smaller fat molecules then an enzyme called l_______ breaks it down further.