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Biology 8.1 Energy and Life

Miller Levine Dragonfly Book
by

Roxanne Price

on 11 March 2014

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Transcript of Biology 8.1 Energy and Life

Energy and Life
END OF SECTION
Plants and some other types of organisms are able to use light energy from the sun to produce food through photosynthesis.
Autotrophs and Heterotrophs
8-1 Energy and Life
Compared to the energy stored in a molecule of glucose, ATP stores
much more energy.
much less energy.
about the same amount of energy.
more energy sometimes and less at others.
8-1
How is it possible for most cells to function with only a small amount of ATP?
Cells do not require ATP for energy.
ATP can be quickly regenerated from ADP and P.
Cells use very small amounts of energy.
ATP stores large amounts of energy.
8-1
Most autotrophs obtain their energy from
chemicals in the environment.
sunlight.
carbon dioxide in the air.
other producers.
8-1
Organisms that make their own food are called
autotrophs.
heterotrophs.
decomposers.
consumers.
8-1
The energy from ATP is needed for many cellular activities, including
active transport across cell membranes
protein synthesis
muscle contraction
walking
blinking
breathing
digestion
etc.
thinking
sensing
etc.
Chemical Energy and ATP
An important chemical compound that cells use to store and release energy is adenosine triphosphate, abbreviated ATP.

ATP is used by all types of cells as their basic energy source.
Chemical Energy and ATP
How is energy released from ATP?
A phosphate is added.
An adenine is added.
A phosphate is removed.
A ribose is removed.
8-1

What is the role of ATP in cellular activities?
Chemical Energy and ATP
3 Phosphate groups
Ribose
Adenine
ATP consists of:
adenine
ribose (a 5-carbon sugar)
3 phosphate groups
Chemical Energy and ATP
Energy comes in many forms including light, heat, and electricity.

Energy can be stored in chemical compounds, too.
Chemical Energy and ATP
P
Releasing Energy

Energy stored in ATP is released by breaking the chemical bond between the second and third phosphates.
Chemical Energy and ATP
Living things need energy to survive.

This energy comes from food. The energy in most food comes from the sun.

How do plants get the energy they need to produce food?
Autotrophs and Heterotrophs
+
Fully charged battery
Partially charged battery
Storing Energy

ADP has two phosphate groups instead of three.

A cell can store small amounts of energy by adding a phosphate group to ADP.
Chemical Energy and ATP
Life requires ATP.
Full transcript