BacteriaBread mold Malaria

protozoanFlatworm

ParameciumRotifer

RoundwormYeast

Snail Spider Tree Sea lion

Turtle PenguinHumans

Sea Sponge

WHAT DO ALL OF THESE THINGS HAVE IN COMMON?

-ALL living things are composed of one or more cells that perform all life’s processes.

Uni-cellular Multi-cellular

• High degree of order within an organisms internal and external parts (cellular level and beyond) and its ineractions with the living world.

Metabolism – using energy in chemical reactions. Energy is needed to maintain molecular & cellular structure as well as to grow & reproduce.

autotroph vs. heterotroph

-Homeostasis – maintain a stable internal environment.

-All living things must maintain a stable temperature, water, mineral & sugar content.

• Living things respond to stimulus (can be both internal or external)– Examples: Sense organs, such as the ear, and

sensory receptors, such as those in the skin, are sensitive to external stimuli such as sound and touch.

-Living things grow by cell division whereas non-living things grow by accumulating more material.-Development is a result of cell specialization – different cells having specific functions

Reproduction – to pass genetic material to new generation of offspring; necessary for the survival of the species.

•sexual reproduction - genetic material is combined from two organisms.

•asexual reproduction – One organism reproduces on its own. Ex: cells divide by a process called binary fission.

Yeast dividing: asexual

Mei Xing and new baby:

sexual

-Organisms within populations change through time, allows for survival in changing environment

-Adaptation – trait that makes a living thing better able to survive in their environment and produce offspring

-Explains diversity of life forms seen on Earth.

8. Living things respond to Stimuli – a physical or chemical change in the internal or external environment.

1. Composed of one or more cells.

2. Highly organized at both the cellular & multi-cellular level.

3. Use energy in chemical reactions. This energy is needed to maintain molecular & cellular structure as well as to grow & reproduce.

4. Homeostasis – maintain a stable internal environment. All living things must maintain a stable temperature, water, mineral & sugar content.

5. Living things grow and develop by cell division whereas non-living things grow by accumulating more material.

6. Reproduction is necessary for the survival of the species. In sexual reproduction genetic material is combined. In asexual reproduction, cells divide by a process called fission.

7. Adapt – acquire traits to become better suited to an environment.

Test Your Knowledge – Label each of the following situations as a characteristic of life

• If you put a plant under the microscope you can see thousands of little box structures.

• In a human, cells group to make tissue and tissue groups to make organs and organs group to make organ systems.

• At the eye doctor, drops were put into my eye which caused my pupil to dilate.• The cross country runners were dripping with sweat. • Hormones are causing noticeable changes in my 5th grade girls. • Jane ate a hot dog for lunch today.• In an embryo, 4 cells divide into 8 and 8 cells divide into 16 and so on.• Jillian is pregnant with twins.• There are millions of different organisms on Earth.• A bacteria cell got too big so it divided into two cells.

Assignment: Characteristics of Life and Diversity

It’s your turn to find a living thing that is very unusual and you know nothing about. Print it out to bring to class and explain why it is alive using the 8 characteristics of life.

Are Viruses Alive?• The idea that viruses are alive is a topic that is still

under debate by scientists all over the world. • Read the article provided and form an opinion

about whether viruses are a living organism or not. • Construct an argument writing piece with a claim

and counterclaim for a virus being alive and not being alive. You pick a stance and provide evidence for and against using the article and your textbook (viruses – Ch. 24).