Cell Biology

1
(No Transcript)
2
Cell Biology
3
Chapter Eight Cell Processes

• 8.1 The Cell Membrane
• 8.2 Cells and Energy

4
Investigation 8B
Photosynthesis and Color

• Does the color of light affect photosynthesis?

5
8.2 What is photosynthesis?

• Photosynthesis is a chemical reaction that takes
  place in the chloroplasts of plant cells.
• During photosynthesis, plants use the energy of
  sunlight to produce energy-rich molecules called
  carbohydrates (ex. glucose).

In photosynthesis, plants take in carbon dioxide
and water and release glucose and oxygen wastes.
6
8.2 What is photosynthesis?

• Chloroplasts are where photosynthesis occurs.
• Chloroplasts work much like solar cells found in
  calculators.

7
8.2 Light and color

• The Sun provides Earth with a steady source of
  light.
• Your eyes see sunlight as white light, but it is
  really made up of different colors of light.

A clear prism can split white light into a
rainbow of color.
8
8.2 Light and color

• Light is part of a collection of waves known as
  the electromagnetic spectrum.
• Waves can be described by their wavelength
  (length from peak to peak), and their energy.

9
(No Transcript)
10
8.2 Light and color

• Color is how we experience the energy of light.

11
8.2 Chlorophyll

• A pigment is a molecule that absorbs some colors
  of light and reflects others.
• Chlorophyll is the main pigment used in
  photosynthesis.

12
8.2 Chlorophyll

• Chlorophyll absorbs mostly blue and red light,
  and reflects green light.
• This is why most plants look green.

13
8.2 Cellular respiration

• Cellular respiration is a chemical reaction that
  occurs in all living things.
• Cells use oxygen and glucose to produce carbon
  dioxide, water, and energy.

14
8.2 Cellular respiration

• In most eukaryotic organisms, cellular
  respiration takes place in the mitochondria of
  cells.
• During cellular respiration, energy is stored in
  a molecule called ATP while some energy is
  released as heat.

15
8.2 Comparing photosynthesis and respiration

• The chemical equations of photosynthesis and
  respiration have an interesting relationship.
• The reactants in photosynthesis are the products
  in cellular respiration!
• The reactants in cellular respiration are the
  products in photosynthesis!

16
(No Transcript)
17
Research Connection
Amazing Cells

• So how do stem cells change into other types of
  cells?
• Scientists are studying this problem.

18
Activity
Making a Concept Map

• A concept map is a way to represent information
  visually.
• Create a concept map to explain how cells get and
  use energy.