Presentation is loading. Please wait.

Presentation is loading. Please wait.

Energy and Life 8-1. Energy Energy is the ability to do work –Work can be playing a sport, thinking, or building a protein in a cell –All living things.

Similar presentations


Presentation on theme: "Energy and Life 8-1. Energy Energy is the ability to do work –Work can be playing a sport, thinking, or building a protein in a cell –All living things."— Presentation transcript:

1 Energy and Life 8-1

2 Energy Energy is the ability to do work –Work can be playing a sport, thinking, or building a protein in a cell –All living things obtain and use energy

3 Autotrophs and Heterotrophs Autotrophs: organisms that use light energy from the sun to make food –Organisms that do photosynthesis or something similar to obtain energy –Examples: plants and algae

4 Autotrophs and Heterotrophs Heterotrophs: organisms that obtain energy from the food they consume –Organisms dependent on consuming other organisms for food –Examples: animals (us ) and fungi

5 Chemical Energy and ATP Energy comes in many forms –Examples: light, heat, electricity, kinetic energy, potential energy Most energy used in living systems comes from breaking chemical bonds

6 Chemical Energy and ATP ATP (Adenosine Triphosphate): chemical compound living things use to store and release energy

7 Chemical Energy and ATP ATP structure: Adenine Ribose 3 phosphate groups

8 Chemical Energy and ATP Energy is stored in the bonds between the phosphate groups Energy is released when the bonds between the second and third phosphate is broken Energy!

9 Chemical Energy and ATP The resulting molecule is called ADP –Adenosine Diphosphate –It can have phosphate groups re-attached to be used again Energy!

10 Chemical Energy and ATP Cells keep a lot of ADP on hand When energy becomes available cells store it by adding a third phosphate to an ADP –Making ATP When a cell needs to do work the third phosphate is broken off, releasing energy

11 Using Biochemical Energy Most energy in a cell is used for active transport Also used for protein synthesis, contracting muscle cells, etc. –All life processes

12 Using Biochemical Energy Cells keep a small supply of ATP on hand –Cells regenerate ATP from ADP using energy in food molecules like glucose –Done by mitochondria

13 Using Biochemical Energy A single glucose molecule contains 90 times more energy than an ATP molecule –Jobs done in a cell require tiny amounts of energy –We couldnt consume enough food to maintain life if a glucose molecule were consumed for each cellular job

14 Using Biochemical Energy Making ATPs from glucose is like making change –Similar to having 100 $1 bills instead of a $100 bill if all you need is a candy bar


Download ppt "Energy and Life 8-1. Energy Energy is the ability to do work –Work can be playing a sport, thinking, or building a protein in a cell –All living things."

Similar presentations


Ads by Google