Bio 20 - Photosynthesis and Cellular Respiration Flashcards
Energy is:
The ability to do work
Where do organisms obtain their energy?
Food
What are the two types of organisms obtaining food?
Heterotrophs and Autotrophs
Autotrophs
Organisms that use sunlight directly to make their own food
Heterotrophs
Consume food such as plants and animals.
Do energy transfers occur in both Heterotrophs and Autotrophs?
Yes
Thermodynamics is:
The study of energy relationships
First Law of Thermodynamics
Energy cannot be created or destroyed, but transferred from one form to another
Does energy pass from organism to organism?
Yes
How is energy lost at each passing?
At each passing of energy some energy is lost as heat
Second Law of Thermodynamics
All conversions of energy produce heat, which is waste energy and not useful for life processes
Heat is considered to be:
waste energy in the body, because it cannot perform any work in the cell
Oxidation
A reaction in which an atom or molecule loses electrons
Reduction
A reaction in which an atom or molecule gains electrons
What processes are always involved in electron transfers between two substances?
Oxidation/Reduction reactions
