3.2

• Enzymes are biological catalysts
• Enzymes speed up biochemical reactions
• Enzyme structure is very specific resulting in each enzyme only facilitating one type of reaction(structure determines functionality)
• • Enzymes can facilitate synthesis or digestion reactions
• All biochem reactions require initial starting energy, called activation energy
• Some reactions result in a release of energy and some reactions result in an absorption of energy
• • Typically reactions that release energy require less activation energy compared to reactions that absorb energy
• Enzymes lower the activation energy of all enzyme-mediated reactions, speeding up the rate of the reactions
• A control group generates data under normal conditions
• Experimental groups generate data under changed/manipulated conditions
• Both experimental and control groups are compared to determine the results of the treatment/manipulation
• There are different types of control groups, negative and positive control group
• The negative control group is not exposed to any experimental treatment
• The positive control group is exposed to the treatment
• A control group is not the same as a controlled variable
• Controlled variables are also known as constants
• Controlled variables are aspects of the experiment that could be changed but aren't changed
• Controlled variables are important to identify the impact of the treatment