2.1.1. Unicellular colonial and multicellular organisms

Which best describes the main job of most cells in multicellular organisms?

• Cells work to keep themselves alive.
• Cells work to keep the organism alive.
• Cells work to release needed materials.
• Cells work to store unneeded materials.

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Why do humans require many different types of cells to survive?

• Human cells are identical and work together to perform the same function.
• Human cells are specialized and work together to perform the same function.
• Human cells are identical and work independently to perform different functions.
• Human cells are specialized and work independently to perform different functions.

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A class is modeling the differences between a unicellular organism and a multicellular organism. Which example is a model of a unicellular organism?

• a student passing out water to a group
• a student getting cereal from the cabinet
• two students collecting trash from a group
• four students working together to move a desk

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A single-cell organism can do everything a cell from a multicellular organism can do except

• specialize.
• reproduce.
• use energy.
• make protein.

Which best describes a multi-celled organism?

• basic
• simple
• uniform
• complex

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Which statement would most likely be found in an article about multi-celled organisms like plants?

• Plants have a simple structure.
• Plants contain only one cell that performs all functions.
• Plants do not need to eat, remove waste, or reproduce.
• Plants contain many specialized cells that perform different functions.

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How are single-celled organisms and multi-celled organisms similar?

• Both need food for energy and growth.
• Both have a skeletal system for support.
• Both require the interaction of many cells to survive.
• Both are able to carry out all life functions in only one cell.

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How are multi-celled and single-celled organisms different?

• Multi-celled organisms need energy to survive, while single-celled organisms need no energy to survive.
• Single-celled organisms can be seen without using a microscope, while multi-celled organisms are microscopic.
• Multi-celled organisms have large numbers of specialized cells to perform a variety of life functions, while single-celled organisms complete life functions with one cell.
• Single-celled organisms have large numbers of identical cells that all perform the same function, while multi-celled organisms have cells that are all different and perform different life functions.

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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

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Which of the following best compares multicellular and colonial organisms?

• Colonial organisms are made of a group of similar cells

• Cells in colonial organisms and multicellular organisms are specialised

• Cells from colonial organisms can survive on their own, while those from multicellular organisms typically cannot

• Examples of colonial organisms include the alga volvox and biofilm while an example of a multicellular organism is a human