Biology AHSGE

Standard III- Photosynthesis and Cellular Respiration

Photosynthesis and Cellular Respiration

CONTENT STANDARD III. Identify reactants and products associated with photosynthesis and cellular respiration, and the purposes of these two processes.

ELIGIBLE CONTENTA. Identify the chemical formula for

photosynthesis.B. Identify the function of photosynthesis.C. Identify the chemical formula for respiration.D. Identify the function of respiration.E. Identify the relationship between

photosynthesis and respiration.

Metabolism

Metabolism- All of the chemical reaction s in a cell– Metabolic pathway- Series of chemical reactions in

which the product of one reaction is the substrate for the next reaction

• Catabolic pathway- Release energy by breaking down large molecules into smaller ones

• Anabolic pathway- Use energy released by catabolic pathways to build larger molecules from smaller ones

• Relationship between catabolic and anabolic pathways result a continual flow of energy within organisms.

Photosynthesis

Photosynthesis- Anabolic pathway in which light energy from the sun is converted to chemical energy for use by the cell– Autotroph/Producer- Organisms that perform

photosynthesis– Use light energy, carbon dioxide and water to build

molecules of glucose and oxygen– Chlorophyll (green pigment found in chloroplasts) is

also required.– Glucose is transferred to other organisms for energy in

the form of food.– Occurs in the leaf cells of plants

Photosynthesis

Sunlight

↓

Chlorophyll

6CO2 + 6H2O C⃗ 6H12O6 + 6O2

Carbon Dioxide Water Glucose Oxygen

Reactants Products

Cellular Respiration

Cellular (Aerobic) Respiration- Catabolic pathway in which organic molecules are broken down to release energy for use in the cell– Aerobic- Requires oxygen– Oxygen is used to break down glucose resulting in the

production of carbon dioxide and water.– ATP (Adenosine Triphosphate)- Biological molecule of stored

energy produced by respiration• Energy is released when the energy storing bond between the second and

third phosphate is broken, forming ADP (Adenosine Diphosphate) and a free phosphate group.

– Heterotroph- Organisms that can not produce their own food.– Occurs in the mitochondria (powerhouse) of cells.

Cellular Respiration

C6H12O6 + 6O2 6⃗ CO2 + 6H2O + ATP Glucose Oxygen Carbon dioxide Water Adenosine triphosphate

Reactants Products

Metabolic Pathway

Photosynthesis and cellular respiration work together to complete a metabolic pathway

The products of photosynthesis are the reactants of cellular respiration and vice versa.

Photosynthesis is necessary to remove energy from the sun, where all energy ultimately comes from.

Metabolic Pathway