Lecture 4 Photosynthesis and respiration handout

Biology 3 Ch 4 Photosynthesis and

Respiration

Dr. Terence Lee

Enzymes

1

Why do some adults get sick when they drink milk?

2

Energy Conversions

All life depends on capturing energy from the sun and converting it into a form that living organisms can use. Two key processes

Take-home message 4.1

The sun is the source of the energy that powers all living organisms and other "machines."

What is energy?

The capacity to do work Work

3

Kinetic Energy

The energy of moving objects

Potential Energy

A capacity to do work that results from the location or position of an object

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Energy Conversions

Only ~1% of the energy released by the sun that earth receives is captured and converted by plants.

? Converted into chemical bond energy

First Law of Thermodynamics

Energy can never be created or destroyed.

ATP Molecules

Cells cannot use light energy directly to do work.

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