Cell Theory and Organelles

The smallest unit of a plant that can perform all of the processes of life is the ___.

• leaf

• cell

• tissue

• root

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A common characteristic of all living things is that they

• 
  breathe air.

• walk upright.

• are made of cells.

• use sunlight for growth.

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The human stomach helps break down food for digestion. Which statement best describes the stomach?

• It is part of a cell with a specific function.

• 
  It is a single cell that performs a life function.

• 
  It is made up of a small number of cells that perform a single function.

• 
  It is composed of millions of cells of several types working together to perform a function.

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The human brain is an organ that is made up of many tissues. This information can be used to determine that the brain is

• 
  unicellular.

• 
  multicellular.

• 
  part of a bacterial colony.

• able to function independently.

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Which of the following characteristics of the cow is different from the paramecium?

• The cow requires energy to survive.

• 
  The cow consumes oxygen during cell respiration.

• The cow's hereditary traits are controlled by DNA.

• The cow is composed of a large number of cells.

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Which term accurately describes these organisms?

• aquatic

• photosynthetic

• unicellular

• motile

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Organisms that are classified as multicellular must have

• only one cell.

• 
  large cells.

• 
  more than one cell.

• identical cells.

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What structures can you find in a plant cell, but not in an animal cell? (pick 2)

• Nucleus

• Mitochondria

• Chloroplast

• Cell Wall

A scientist discovers what he thinks is a cell. Which question about this new discovery should the scientist answer first to determine if it is a cell?

• 
  How long does it live?

• Can it reproduce itself?

• How large can it grow?

• 
  Does it contain DNA?

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Which of these characteristics would disqualify a newly discovered biological structure from being called a cell?

• It cannot exchange materials with its environment.

• 
  It does not contain membrane-bound organelles.

• 
  It lacks a method for moving and gathering food.

• 
  It has no stiff outer layer for support and protection.

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