Comparing LifeLiving things are both similar to and different from each other and from nonliving things.

Objective1. Compare and contrast the parts of plants, animals, and one-celled organisms.

Cells• Living things are

composed of cells

CellsMuscle Cells

• Cells provide structure and carry on major functions to sustain life.

CellsHeart Muscle Cells

• Cells provide structure and carry on major functions to sustain life.

CellsRed and White Blood Cells

• Cells provide structure and carry on major functions to sustain life.

Cells• Cells are usually

microscopic in size.

Cells• cells function

similarly in all living things

Strep bacteria

Onion plant

Chimpanzee

Cell Division• Cells grow and

divide, producing more cells.

E. Coli bacteria dividing

Cell Division• Cells grow and

divide, producing more cells.

Paramecium dividing

Cell Division• Cells grow and divide, producing more cells.

Cell Division

Cells take in nutrients• Cells use nutrients

to • provide energy for the work that cells do

• to make the materials that a cell or an organism needs.

Photosynthesis

Cell Respiration

Cells take in nutrients

• to make the materials that a cell or an organism needs.Photosynthesis

Cells take in nutrients

• to make the materials that a cell or an organism needs.Photosynthesis

Cells take in nutrients• To provide energy for the work that cells do

Cell Respiration

Basic Cell Structure• Most cells have cell

membranes, genetic material, and cytoplasm.

Even bacteria!bacterial chromosome

Structures Unique to Plant Cells

• Some cells have a cell wall and/or chloroplasts.

Elodea

Structures Unique to Plant Cells

• Some cells have a cell wall and/or chloroplasts.

Cell Wall

Chloroplast

The Nucleus• Many cells have a

nucleus.

Unicellular Organisms• Some organisms

are single cells

Amoeba

Unicellular Organisms• Some organisms

are single cells

Paramecium

Unicellular Organisms• Some organisms

are single cells

Euglena

Multicellular Organisms• Some organisms

are made up of many cells

Homo sapiens

Multicellular Organisms• Some organisms

are made up of many cells

Hydra

Multicellular Organisms• Some organisms

are made up of many cells

Oak Tree

Multicellular Organisms• Some organisms

are made up of many cells

Daphnia

Levels of Organization• Cells are organized

for more effective functioning in multicellular organisms.

Levels of Organization.

Levels of Organization

OrganTissueCell Organ System

Plants• Many plants have

roots, stems, leaves, and reproductive structures.

Plants• These organized

groups of tissues are responsible for a plant’s life activities.

Multicellular Organism• Animals have

similar organs and specialized systems for carrying out major life activities.

Human Cardiovascular

System

Pig Cardiovascular

System

Digestive Systems

Classification• Living things are

classified by shared characteristics on the cellular and organism level.

Bacteria Cells with a Nucleus

Classification

• In classifying organisms, biologists consider details of internal and external structures.

Classification• Biological

classification systems are arranged from general (kingdom) to specific (species).

Classification• Biological

classification systems are arranged from general (kingdom) to specific (species).

Classification• Biological

classification systems are arranged from general (kingdom) to specific (species).