Provide an alternate pathway with a lower activation energy for a reaction
coenzymes
enzymes do this, or the great aid of enzymes is how they are joined. the "unit" would be the enzymes, who created the unit? dont know, mother nature? rRNA
During digestion the enzyme in saliva works on cooked food
A substrate
Both. Salivary amylase works in your mouth, and the others in your stomach and duodenum.
It works with faeces and urine like you do!
Enzymes. The name of an enzyme usually ends with an -ase, and start with the substrate it works with.
The substrate on which a catalyst works is called its substrate
By enzymes, The way in which enzymes actually work is extremely complicated so we use the models to think about them. A good model tries to represent the known facts about something. A model about digestive enzymes needs to try to represent these facts: · Enzymes turn large molecules into smaller ones. · Enzymes do not get used up as they carry out their tasks. · Enzymes change shape as they work. · Each enzyme only works on one particular type of molecule.
Pepsin is an enzyme that works best in acidic conditions, specifically in the stomach where the pH is around 1.5-2. Other examples include gastric lipase and gastricsin. These enzymes are specialized to function optimally in acidic environments for the digestion of proteins, lipids, and other nutrients.
This is not true. Different enzymes thrive in completely different pH conditions. Consider the protease pepsin, which works in the stomach. It breaks down proteins in acidities as low as pH 2. In the duodenum, lipase works best in slightly alkaline conditions.
if you mean what do you call the substance that an enzyme works on then that's called a substrate