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18 Cards in this Set

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  • Back
Catabolic Pathway
Release energy by breaking down complex molecules to simpler compounds
Anabolic Pathway
Consume energy to build more complex molecules from simple ones.
Energy Coupling
Energy released from “downhill” reactions of catabolism can be used in the “uphill” reactions of anabolism
The study of cellular energy transformations
collection of matter under study (can be a molecule, a cell, or an organism)
Open system
exchanges both energy and matter with its surroundings. Living cells are open systems. (The universe is a closed system).
What is the role of Thermodynamics in energy?
All energy transformations are governed by the same two laws of the universe known as the first and second laws of thermodynamics.
First Law of Thermodynamics
Energy can not be created nor destroyed, only transformed from one state to another
implies that the energy of the universe is constant.
example of energy transformation : burning of fossil fuel to move vehicles (chemical energy to kinetic energy).
Second Law of Thermodynamics
second law implies that the entropy of the universe is increasing. This is because according to the second law energy conversions are not 100% efficient i.e. some heat is always released.
amount of disorder (randomness) in a system.

(S) For a closed thermodynamic system, a quantitative measure of the amount of thermal energy not available to do work.
Is heat one kind of disorder??
Yes, because it disrupts the stability.
Free Energy
(G) a measure of a systems ability to do work under a constant temperature.
Free energy (G) depends on the total energy of the of a system (H) and it’s entropy (S)
G = H – TS
loss of an electron
gain of an electron
Cellular Respiration
energy-releasing chemical breakdown of glucose molecules and the storage of the energy in a form that the cell can use to do work.
Cellular Metabolism
sum of all exergonic and endergonic reactions in a cell.
What does ATP do?
Chemical Energy in the form of ATP powers nearly all cellular work.