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STUDY PACKET 6:
CHAPTER 4 – ENERGY AND ENZYMES
1. Describe each of the laws of thermodynamics.
a. Zeroth Law of Thermodynamics: This law says that if two things are at the same temperature as a third
thing, they are also at the same temperature as each other. It is like a way of defining temperature and
helps us compare temperatures.
b. First Law of Thermodynamics (Law of Conservation of Energy): This law states that energy cannot
just appear out of nowhere or disappear; it can change from one form to another. It is the principle behind
the conservation of energy, telling us that the total energy in a closed system always stays the same.
c. Second Law of Thermodynamics: This law is all about the idea that things tend to get messier over
time. It says that in any energy change, the total disorder, or entropy, of a closed system will increase. For
example, heat naturally flows from hot things to cold things, not the other way around, unless you do
work to make it happen.
d. Third Law of Thermodynamics: This law talks about what happens when we get incredibly close to
absolute zero, which is the coldest temperature possible. As we get colder and colder, the disorder, or
entropy, in a system approaches a minimum value. It is essential when studying very cold things, like
supercooling matter close to absolute zero.
2. Using sucrase as an example, outline the catalytic cycle of an enzymaticreaction.
Also what is the substrate in this reaction?
The catalytic cycle of sucrase in …
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