3-2 Basic unit of living things

Seeing and Understanding

Place the magazine picture on your desk.

Use a magnifying glass to look at the image.

Start with the magnifying glass on top of the image and then slowly move the magnifying glass away, studying the photograph as you do.

Seeing and Understanding

• What happens as you move the magnifying glass away from the image?

• How can a simple magnifying tool help you understand better how the image was printed?

Bits and Pieces

• Put the words back together into a sentence.

• What clues can you use to put the sentence back together?

• How can the parts of something help you understand how the whole works?

Cells

• What functions do the different parts of the cell perform?

Does Wubbzy show signs of life?

• Sit quietly and observe Wubbsy. Note its behavior. What does Wubbsy do? What happens to it?

• How does Wubbsy seem alive?

• How do you know for sure that it is not?

Main Idea WebLiving things and how they differ

from non living things

Characteristics of Life

• Organized• Meet its needs

Blue-green algae are very simple.

Kingfisher is organized so that different parts of its body perform different jobs, called functions.

The ability to develop and grow

• Grow and in most cases, develop into adult forms.

• Some organisms change a great deal in size and appearance.

• Others change very little.

Hydra changes very little

Cheetahs change greatly from birth

The ability to respond to the environment.

• Respond to the world outside them.

• Is the weather hot or cold?

The ability to reproduce

• Organisms can reproduce, producing new organisms that are similar to themselves.

What four characteristics are common to all living things?

• List the characteristics that a flower, a puppy, a house and a cup of water have in common and ways that they are different.

Can a house respond to environmental changes?

Needs of Life

Energy Space to live and growAll organisms require a steady

supply of energy to stay alive. Where does almost all the energy used by life on Earth come from?

Deforestation is the removal of a forest or stand of trees where the land is thereafter converted to a nonforest use.

• What activities that plants and animals do are carried out by cells?

All living things are made of cells.

• The cell is the smallest unit of a living.• Some organisms are made of a single cell.

– These organisms are unicellular

– Too small for you to see directly

The HeartCirculatory system

Cardiac Muscles

Cardiac Cells

Most organisms you can see are made up of many cells. They are

called multicellular organisms.

What are some differences between the multicellular and unicellular organisms in this

photograph?

3-3 Microscope

Microscope1660 Robert Hooke began using microscopes for looking at all kinds of things.

1670 Anton van Leeuwenhook continued the work.

• Hooke’s layer of cork from a oak tree bark.

• Groups of similarly shaped compartments that looked like tiny empty rooms or cells.

• 30x• Dead cells that’s why they

appeared empty.

van Leeuenhook

First person to describe living cells.

Saw things magnified 300x.

We will look at pond water

Magnified

30x

300x

How did the invention of the microscope change the study of

biology?

Antenna of a moth magnified 1200x using a scanning electron microscope.

Cell Theory

1) Every living thing is made up of one or more cells

2) Cells carry out the functions needed to support life

3) Cells come from other living cells

• What is the polar bear made of?

• What is a fat cell?

• How did the polar bear cub begin life?

1) Cells

2) A specialized cell that provides energy and insulation.

3) As a single fertilized egg cell

Give an example for each corner of the triangle.

Cells

Carry out all necessary functions

Come only from other cells

Are in all living things, even the smallest

Cell..Theory!!

Theory is a widely accepted explanation of things observed in nature.

A theory must be supported by evidence, including experimental evidence and observations

1) Satisfy scientist desire to understand the natural world.

2) Foundation for further research and study.

3) Lead to research.

Louis Pasteur

1) Pasteurization2) First animal

vaccinations

Pasteur’s research found

Spontaneous generation, bacteria grew from non living things

1) What is the difference between the two flask?

2) How would the observer know if a flask was contaminated?

Page 15 Questions 1-6

Answers will stay in the note section of your notebook