Exam Q&A Flashcards
How do you work out the total magnification of an object?
Multiply Objective Lens with Eyepiece Lens
What is a field of view?
The circle you can see under a microscope - it can be measured using a ruler
What is the focusing wheel?
It is a wheel that turns the stage up or down to get an object into focus.
When should the fine focusing wheel be used?
To make an object more clear.
What is the highest magnification for a microscope?
400
What are catalysts?
Chemicals which speed up chemical reactions, it is not used up in the reaction so can be used again and again. They are made of protein and are examples of biological enzymes.
What are enzymes?
Enzymes are proteins and are biological catalysts. They speed up the reaction and are not used up in the process. Each enzyme is specific to its substrate, which are changed into glucose
What is the structure of enzymes?
Enzymes are protein molecules, meaning they are made up of amino acids. Enzymes contain 100-1000 amino acids. The acids join together in a long chain and create a unique 3D structure.
What is the part of the enzyme where the reactant binds called?
The active site
What are enzymes involved in doing?
Building large molecules from small ones, changing one molecule into another and breaking large molecules into small ones.
What happens at the active site/
The substrate fits into the enzymes active site like a lock and key, the enzyme splits the substrate into two parts.
How can an enzyme’s active site become denatured?
It could be too hot, acidic or alkaline
What does amylase do?
Catalyses he breakdown of starch into glucose
What does protease do?
It catalyses the breakdown of protein into amino acids
What does lipease do?
Catalyses the breakdown of lipids into fatty acids and glycerol in the pancreas and small intestine
