Lecture 4 Photosynthesis and respiration handout

[Pages:17]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

4

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.

5

Photosynthesis

? The process in green plants and certain other organisms by which ...

Photosynthesis: The Big Picture

6

"Photo" and "Synthesis"

Light Energy

Different photons carry different amounts of energy, carried as waves. Length of the wave = amount of energy the photon contains.

Electromagnetic Spectrum

Range of energy that is organized into waves of different lengths. Shorter the wavelength, higher the energy.

7

Visible Spectrum

Range of energy humans see as light Pigments

Chlorophyll

Plant pigment Absorbs certain wavelengths of energy (photons) from the sun

Plant Pigments

Plant pigments can only absorb specific wavelengths of energy

8

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download