Week in Review-Cells and Organisms

Which best describes a single-celled organism?

• a small group of organisms
• an organism that is able to carry out all its life processes
• a small organism with a variety of parts
• an organism that relies on other organisms to survive

Which is a characteristic of bacteria?

• large in size
• found only in one particular environment
• made up of many different cells working together
• able to survive as a single cell

How are multicellular and unicellular organisms different?

• Multicellular organisms have more than one cell and are smaller than unicellular organisms.
• Unicellular organisms have more than one cell and are larger than multicellular organisms.
• Unicellular organisms have one cell and are smaller than multicellular organisms.
• Multicellular organisms have one cell and are larger than unicellular organisms.

7. Classify the following examples (pictures) as unicellular or multicellular

• 1. Unicellular
• 2. Multicellular

1. What does the prefix "uni" means?

• 1. Two

• 2. One

• 4.many

4. What does multicellular means?

• 1. one cell

• 2. no cell

• 3. many cell

A scientist is trying to decide whether an organism is unicellular or multicellular. Which information would help the scientist most to make her decision?

• size of the cells of the organism

• what the organism eats

• how many types of cells are in the organism

• how fast the organism grows

Are typically larger organisms

• Multicellular

• Unicellular

Are typically smaller, microscopic organisms

• Multicellular

• Unicellular

Bacteria is what kind of cell?

• Eukaryotic
• Prokaryotic