Question

. Explain how photosynthesis and respiration are linked in orderto provide you with energy from the food you eat.

Include in your essay:

• Complete descriptions of photosynthesis and aerobicrespiration.
• Describe how these two processes are linked between plants andanimals based on the reactants and products (water, carbon dioxide,glucose and oxygen) of both pathways.
• Include a description of how energy is transferred fromsunlight to ATP, from ATP to sugars, and from sugars to yourcells.

2. In the absence of oxygen some cells and organisms can useglycolysis coupled to fermentation to produce energy from the sugarcreated by photosynthesis.

• Explain the role of fermentation in allowing an organism togenerate energy for its cell(s) in the absence of oxygen.
• Include any reactions required for this process, and explainhow the energy from the sun ends up as chemical energy for theanaerobic organism or cell.

3. Cells use enzymes as biological catalysts to increase oraccelerate the rate of reactions, such as those in photosynthesisor glycolysis. This allows reactions to occur under conditions thatsustain life.

• Explain how an enzyme catalyzes a reaction. Include in youressay the three main steps of the cycle of enzyme-substrateinteractions.
• How is enzyme activity regulated by the cell?

Reference

Audesirk, T., Audesirk, G., and Byers, B. (2008). Biology –Life on earth with physiology (8th Ed.). San Francisco, CA:Benjamin Cummings.