Your Objective The learner will identify the basic

Your Objective The learner will identify the basic characteristics of organisms: 1. unicellular organisms 2. multicellular organisms

Today’s Assignment Today you will complete: 1. Fill in the blanks for the notes, as you read this power point. 2. Complete a Venn diagram on your paper. comparing and contrasting unicellular and multicellular organisms

Single-Celled BOTH Multi-Celled

The Characteristics of Cells Review the Cell Theory: The cell theory lists three basic characteristics of all cells and organisms: 1. All organisms are made up of one or more cells. 2. The cell is the basic unit of all organisms. 3. All cells come from existing cells. Copyright © Houghton Mifflin Harcourt Publishing Company

Vocabulary to Review: • A cell is the smallest functional and structural unit of all living organisms. • An organism is any living that carries out its own life processes. • Robert Hooke was the first to describe cells. He looked at the bark of a cork tree under a microscope. Copyright © Houghton Mifflin Harcourt Publishing Company

Multicellular and Unicellular Organisms

Did you know? Organisms can be classified into groups based on their cellular structure Organisms can be classified as unicellular or multicellular: Unicellular Multicellular If their entire body is made up of one cell (unicellular) or many cells (multicellular)

Let’s begin by focusing on unicellular organisms. bacteria paramecium euglena : a unicellular algae (a protist) Organisms made up of just one cell are unicellular. Uni = one

Unicellular Organisms uni = one • Amoebas, Algae, Plankton, and bacteria are single-celled organisms. • You need a microscope to see singlecelled organisms.

Examples of Unicellular Organisms Bacteria (prokaryotic)

Examples of Unicellular Organisms Protists (Eukaryotic) Euglena: a unicellular algae (a Protist)

Examples of Unicellular Organisms Yeast (Eukaryotic) A unicellular fungi

Characteristics of Unicellular Organisms Achaea Bacteria Archaea in Acidic hot springs Archaea in Salty water Bacteria lives all over Earth • Found in various locations – found all over Earth – extreme environments (high heat, salt, acid, etc. )

Characteristics of Unicellular Organisms Yeast: A unicellular fungi Bacteria • Asexual or Sexual Haploid yeast cells are able to conduct sexual reproduction Bacteria cells are able to conduct asexual reproduction - Asexual: one parent passes copies of its genes to its offspring - Sexual: two parents combine their genes and pass it on to their offspring

Multicellular Organisms

Now let’s focus on multicellular organisms. Animals Plants Mushroom: A multicellular fungus A multicellular organism is made of two or more cells. Cells are differentiated (specific to its function). multi = many

Examples of Multicellular Organisms Human (Eukaryotic)

Examples of Multicellular Organisms Cedar Tree (Eukaryotic)

Examples of Multicellular Organisms Ladybug (Eukaryotic)

Examples of Multicellular Organisms Mushroom (Eukaryotic fungus)

Characteristics of Multicellular Organisms Multicellular organisms live all over Earth • Found in various locations – found all over Earth – Few are found in extreme environments

Characteristics of Multicellular Organisms • Sexual reproduction - Sexual: two parents combine their genes and pass it on to their offspring

Essential Questions How do single and multiple cells compare and contrast?

Let’s Review! Single-celled organisms are made of only one cell. Example: algae, amoeba, paramecium Multi-cellular organisms, such as plants and animals, have a higher degree of specialization where the cells work together and function to create a living organism.

AGAIN! • Organisms made up of just one cell are called unicellular organisms. • The single cell must carry out all of the organism’s life functions. • Organisms made up of more than one cell are called multicellular organisms. • The cells of multicellular organisms have specialized functions. Copyright © Houghton Mifflin Harcourt Publishing Company

Multi Celled Examples Plants Animals Fungi

Multi-Celled Organisms • Multi = many • things made up of more than one cell are multi-celled organisms. • You are a multiple celled organism. • Can you think of any other multi-celled organisms?