cell energy ch4.2 7th pdf

8/14/2019 Cell Energy Ch4.2 7th PDF

http://slidepdf.com/reader/full/cell-energy-ch42-7th-pdf 1/18

Chapter 4 Section 2



Describe photosynthesis and cellularrespiration

Compare cellular respiration with fermentation



All cells need energy to live, grow, andreproduce

Plant cells get energy from the sun

Animal cells get the energy they need fromfood



Plants capture energy from the sun and changeit into food through a process called:photosynthesis

The food that the plants make supplies themwith energy

This food is a source of energy for organismsthat eat plants



http://grapevine.net.au/~grunwald/une/KLAs/science/irrigation-photosynthesis.gif



Definition:

The process by which plants, algae, and somebacteria use sunlight, carbon dioxide, and water tomake food



Molecules in plant cells that absorb lightenergy: pigments

Chlorophyll = pigment used in photosynthesis Gives plants their green color

Found in chloroplasts

http://www.usoe.k12.ut.us/CURR/science/sciber00/8th/energy/images/chloro.jpg



Plants use energy captured by chlorophyll tochange CO2 and H2O into food

Food is in the form of glucose (a simple sugar –carbohydrate)

Glucose is used by the plants cells as storedenergy

Oxygen is produced



https://reader010.{domain}/reader010/html5/0627/5b32e2140e9e7/5b32e21b855f6.jpg



Animals use:

Cellular Respiration: using oxygen to break down

food

Fermentation: breakdown of food without oxygen



A chemical process that occurs in cells

Food (glucose) is broken down into CO2 andH2O and energy is released

In animals, energy maintains body temperatureor forms ATP


http://slidepdf.com/reader/full/cell-energy-ch42-7th-pdf 12/18http://www.soulcare.org/Creation/photosynthesis_respiration_diagram.gif



In prokaryotic cells:

Takes place in the cell membrane

In eukaryotic cells:

Takes place in the mitochondria



http://www.rogers.k12.ar.us/users/ehutches/image150.gif



Each process makes materials that are needed forthe other process to occur

Photosynthesis

uses CO2

makes glucose

releases oxygen

Cellular Respiration uses oxygen

breaks down glucose

releases CO2



When your cells can’t get the oxygen they needfor cellular respiration

Ex: Muscles – lactic acid production

Ex: Bacteria - yogurt

Ex: Yeasts – causes dough to rise


http://slidepdf.com/reader/full/cell-energy-ch42-7th-pdf 17/18http://bioinfo.bact.wisc.edu/themicrobialworld/fermentation_products.jpg

cell energy ch4.2 7th pdf

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