1. Is it living or nonliving? That is the question. How can you tell?
Remember: cred gr

2. Discussion Questions
Do any nonliving things possess characteristics of living things? Give examples.
How were the living things different from the nonliving things?
What characteristics did ALL of the living things have in common?

3. The Necessities of Life
The Bare Necessities

4. The Necessities of Life
Water
Air
A Place to Live
Food

5. Water Your body is approximately 70% water.
Most chemical reactions involved in metabolism require water.
You would survive only about 3 days without water.

6. Air Most living things use oxygen to release energy from food.
Organisms living on land get
oxygen from the air
Organisms living in water either
come to the surface to get oxygen from the air or take in dissolved oxygen from the water.
Green plants need Carbon dioxide and oxygen. During the process of photosynthesis, they convert the energy in sunlight to food.

7. A Place to Live All organisms need a place to live that
contains all the things
they need to survive.
Space is limited
Organisms often compete
for food, water and
other necessities.

8. YOU’RE NOT YOU WHEN YOU ARE HUNGRY
Food
Food gives organisms energy and the raw materials needed to perform life processes.
Organisms use nutrients to replace cells and to build body parts.
Producers – Make their own food. Plants use energy from the sun to make food from water and carbon dioxide.
Consumers – Gets its energy from eating or consuming other organisms (MOST ANIMALS)
Decomposers – These are consumers that break down nutrients in dead organisms and animal waste (MUSHROOMS)
YOU’RE NOT YOU WHEN YOU ARE HUNGRY

9. Molecules and Nutrients
All organisms must break down food in order to use the nutrients in it.
Nutrients are made up of molecules.
A molecule is a substance made when two or more atoms combine
Molecules made of two or more different atoms are compounds.
Molecules in living things are made up of a combination of carbon, hydrogen, nitrogen, oxygen, phosphorus and/or sulfur.

10. Building Blocks of Cells
Proteins
Carbohydrates
Lipids
ATP
Nucleic Acids

11. Proteins Proteins are made up of smaller molecules called amino acids.
Enzymes are proteins that speed up chemical
reactions
Proteins are needed to build and repair body structures and to regulate processes in the body.
Hemoglobin is a protein found in red blood cells that attaches to oxygen
Spider webs, hair, horns,
and feathers are made
of proteins.

12. Carbohydrates
Energy giving nutrients such as sugars, starches and fiber are carbohydrates.
Molecules made of sugars are called carbohydrates.
Cells use these as a source of energy and for energy storage.
Simple Carbohydrates – Table sugar and the sugar in fruit
When an organism has more sugar than it needs,
its extra sugar is stored as a Complex Carbohydrate. Potatoes store the extra sugar as starch. Your body breaks this down to release the energy stored in the potato.

13. Lipids (fat lips) Cannot mix with water
Fats, oils are lipids that STORE energy
Most lipids stored in plants are oils
Most lipids stored in animals are fats
Some form the membrane of cells

14. Phospholipids
Form the cell membrane

15. ATP – Carries Energy Major energy carrying molecule in the cell.
Provides fuel for cellular activities when the energy in carbohydrates and lipids is transferred to ATP.

16. Nucleic Acids
Molecules consisting of subunits called nucleotides are nucleic acids
The blueprints of life.
They contain all the information needed for a cell to make proteins
DNA is a nucleic acid