Unicellular and Multi-cellular Organisms

Which is an example of a single-celled organism?

• amoeba
• insect
• fish
• worm

Single-celled organisms must be able to

• specialize thier cells to each perform a specific function.
• perform all necessary functions of life with only one cell.
• perform no functions with any of their cells.
• choose only one function to perform with their one cell.

Why do multicellular organisms need transport systems?

• Most have cells that are not able to exchange gases with the outside environment.
• Most have cells that are unable to grow and survive in their environment.
• Most have cells that need food from sources outside their environment.
• Most have cells that require more energy to survive than single-celled organisms.

What is the main reason that multi-celled organisms, such as humans, have developed specialized cells?

• so parts of the body will no longer be necessary
• so cells can be more efficient
• because specialized cells are interchangeable
• so cells can be lazy

Which statement about the different types of cells is true?

• Different types of cells have similar shapes and sizes.
• Different types of cells do not need each other in order to survive
• Different types of cells cooperate to keep the organism alive.
• Different types of cells look different, but they all do the same job.

Which statement best describes a bacterial cell?

• It contains more than one cell.
• It is a complete organism.
• It is a part of a larger organism.
• It contains different types of cells.

Which characteristic do single-celled organisms and multicellular organisms have in common?

• Both have cells with specialized functions for each life process.
• Both perform all life processes within one cell.
• Both have a way to get rid of watste materials.
• Both are able to make food from sunlight.

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 in the organism
• what the organism eats
• how many types of cells are in the organism
• how fast the organism grows

All organisms are made up of cells. Organisms can have...

• either many cells or no cells.
• only one cell each.
• one cell or many cells.
• 200-300 cells each.

Why is the shape and size of a cell important to its function?

• The shape and size of a cell help the cell live longer.
• The shape and size of a cell help the cell perform a specific function.
• The shape and size of a cell help the cell grow larger
• The shape and size of a cell depend on the number of organelles it has.