Life Science Chapt2

Life ScienceChapt 2

Spring 06’

7 Characteristics of living things (Organisms)

List 5 things that are alive-

How are these things different than a rock?

What do you think it really means to be alive?


Most living things move in some way.


Energy is the ability to do work and cause change

• Walking

•Talking

•Thinking

•Breathing

•Playing

•Studying

All require

energy!

Where do living organisms get their energy?


Living things all grow and change. Whether talking about a person or a tree changes will take place as long as the organism is alive.


Organisms respond to the environment around them. What are some common responses to your environment?

• Stimulus: A change in the environment that occurs and causes a reaction.

• Response: The way an organism reacts to the stimulus


All organisms must reproduce-offspring are

the result of reproduction.

Asexual- One member of a species splits

into two

Sexual- Two members of the same species are needed


Cells are the building blocks of life

Unicellular-

An Organism that has only

one cell

Multicellular-

Organisms that have more than

one cell

Cells are the building blocks of life

Cells are the basic structure and function in all living things. Most cells are too small to be seen without a

microscope.


The ability to maintain a stable internal conditions.

Molecule: The smallest part of a

compound

Compound: A combination of

two or more elements

Chemistry of Organisms

Compounds in living things

LipidsMostly C, HFats & Oils

Store energy

LipidsMostly C, HFats & Oils

Store energy

Nucleic AcidsTransfer genes

Produce proteins

Nucleic AcidsTransfer genes

Produce proteins

Proteins Chemical Reactions

Build & repair cells

Proteins Chemical Reactions

Build & repair cells

CarbohydratesC, H, O

Provide energy

CarbohydratesC, H, O

Provide energy

OrganismOrganism

Chemistry of Organisms

Oxygen

Carbon

Hydrogen

OtherElementsNitrogen

H-10%

C-18%

O-65%

N-3%

Other Stuff-4%

Atoms-the smallest particle of an element that can still be identified as that element

Element-pure substance that is made up of the same kinds of atoms

Review

• Living things are called organisms

• Most organisms have 7 characteristics in common: The ability to move, use energy, grow and develop, respond to their environment, reproduce, homeostasis, and are made of cells.

Review

• Organisms are made up of elements. Examples of elements found in organisms are hydrogen, oxygen, carbon, and nitrogen. A combination of two or more elements is a compound.

• Elements form compounds. The most common compounds found in organisms are carbohydrates, lipids, proteins, and nucleic acids.

Technology

Life Science Chapt2