1. Energy Transformations: Photosynthesis & Respiration
2. Read pages 218-220
What is energy?
List 2 processes (in the cell) that require energy (the ability to do work).
What is the difference between an autotroph and a chemotroph?
What is metabolism?
3. ATP & ADP
ATP: Adenosine triphosphate
adenine + ribose + 3 phosphates
Energy storing molecule, only stores energy for a few minutes
Source of all cell energy
When one phosphate group breaks off, energy is released
Adenine Ribose 3 Phosphate groups 4.
ADP: Adenosine diphosphate
Adenine + ribose + 2 phosphates
Molecule that results from ATP losing one P
Another P may be added later
ADP ATP Energy Energy Partially charged battery Fully charged battery Adenosine diphosphate (ADP) + PhosphateAdenosine triphosphate (ATP) 5. Describe organelles involved in energy transformation
Energy transformation is when energy is converted from one form to another.
Energy transformations involve photosynthesis and respiration.
6. Photosynthesis 7.
Found in plant cells, some protists & bacterianot animal cells
Contain pigment called chlorophyll (green)
Allows plants to go through photosynthesis by converting light into energy for the cell
8. Overview Photosynthesis
Photosynthesis:process using energy from sunlight to convert water and CO 2into oxygen and carbohydrates (sugar)
Light dependent reactions: produce O 2& converts ADP to ATP
Calvin cycle (dark reactions): use ATP from light reactions to produce sugars
Light Energy CO 2+ H 2 O Sugars + O 2 Chloroplast 9.
Chlorophyll :green pigment in cells that absorbs blue & red light energy
Moves energy to electrons that drive reactions
Equation for photosynthesis:
6CO 2+6H 2 O + energyC 6 H 12 O 6+ 6O 2
MITOCHONDRIA:powerhouse of cell
Releases energy from food molecules
Found in both animal and plant cells
A cell that needs more energy has more mitochondria
Ex: muscles, growing cells, areas of repair
11. Overview cellular respiration
Respiration:process that releases energy by breaking down food when oxygen is present
Equation for Respiration:
C 6 H 12 O 6+ 6O 2 6CO 2+ 6H 2 O + energy
Anaerobic respiration: (fermentation) occurs without oxygen present
Alcoholic: form ethyl alcohol and CO 2as waste products; used to make bread rise
Lactic acid: produces lactic acid in muscles when exercising without enough oxygen
13. Photosynthesis Respiration Function Energy storage Energy release Location Chloroplasts Mitochondria Reactants Carbon dioxide water Glucose oxygen Products Glucose oxygen Carbon dioxide water Equation