Photosynthesis Energy & Life

Objectives  Explain why almost all organism depend on photosynthesis  Describe the role of ATP in cellular activities  Explain where plants get the energy they need to produce food

Energy for Life  All organism use energy to carry out the functions of life  Where does this energy ultimately come from?

Energy for Life

Two Main Types of Organisms AUTOTROPH  Get energy by making their own food  Do so by building organic molecules HETEROTROPH  Get energy by taking in food  Do this directly or indirectly from autotrophs

AUTOTROPHS & HETEROTROPHS EXAMPLES  AUTOTROPHS  HETEROTROPHS

Autotrophs & Heterotrophs Review 1.What is an autotroph? 2. What is a heterotroph? 3. How does each one get their energy for life functions? 4. Give 3 specific examples of each.

HOW IS ENERGY STORED AND RELEASED?  Energy comes in many forms: heat, light, electricity and chemical  The activities of cells are powered by chemical energy compounds  For example:  Living things use ATP

ATP Adenosine Triphosphate AdenineRibose3 Phosphate groups

Releasing Energy  Break off a phosphate  RELEASE ENERGY!

Storing Energy  Put the phosphate back on  STORE ENERGY!

Generating ATP ADP ATP Fully charged battery Partially charged battery Adenosine diphosphate (ADP) + Phosphate Adenosine triphosphate (ATP) Energy

What kind of work do cells do?

Review Questions 5.What is the role of ATP in cellular activities? 6.What is the difference between ATP and ADP?