Cell Energy (Photosynthesis and Respiration) Notes

Cell Energy (Photosynthesis and Respiration) Notes

I. Energy ? ability to do work; forms of energy: heat, light, chemical, electrical, mechanical, kinetic, potential

A. Energy for living things comes from - food Originally the energy in food comes from - sun

B. Uses light energy from the sun to produce food ? autotrophs

Examples: plants + some microorganisms (bacteria and protists)

C. Cannot use the sun's energy to make food ? heterotrophs; obtain energy from food they consume

Examples: animals, fungi, most microorganisms

II. Cell Energy ? needed for active transport, making proteins and nucleic acids, chemical signals (fireflies' light)

A. Cells usable source of energy ? ATP

1. ATP stands for adenosine triphosphate

ATP

3 Phosphate groups

adenine

ribose

2. ADP stands for ? adenosine diphosphate

ADP

2 phosphate groups

adenine

ribose

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