Exploring the Hierarchical Structure of Multicellular Organisms

What is the smallest scale of life that is indisputably considered alive?

• Atom

• Molecule

• Cell

• Virus

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Why do some people debate whether viruses are living or not?

• Because they can reproduce but need other cells to do so

• Because they can move

• Because they can breathe

• Because they can grow

What is unique about the genetic information in most cells of the human body?

• It is different in every cell

• It is only present in the brain cells

• It changes every day

• It is the same in every cell

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What are the blue-dyed parts of the neurons shown in the video?

• Their synapses

• Their nuclei

• Their dendrites

• Their axons

What is the primary function of neuroglial cells?

• To transmit signals

• To store information

• To support neurons

• To produce hormones

Approximately how many neurons are there in the human brain?

• 50 to 60 billion

• 30 to 40 billion

• 10 to 20 billion

• 80 to 90 billion

What do specialized cells form when they work together?

• Organisms

• Organs

• Systems

• Tissues

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What is the next level of organization after tissues?

• Organisms

• Cells

• Organs

• Systems

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How many cells are estimated to be in an average-sized human body?

• 40 to 50 trillion

• 20 to 30 trillion

• 10 to 20 trillion

• 30 to 40 trillion

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How many bacteria are estimated to be in the human body?

• 150 trillion

• 10 trillion

• 50 trillion

• 100 trillion

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