Khan Academy - Organization of Multicellular Organisms

The smallest level of life is the (a)   .

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NGSS.MS-LS1-1

The ____ is also called the basic building block of life in organisms.

• Atom

• Tissue

• Cell

• Molecule

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NGSS.MS-LS1-1

NGSS.MS-LS1-2

What is a multicellular organism?

• an organism with one cell

• an organism with many cells

• an organism where organelles replace organs

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NGSS.MS-LS1-1

NGSS.MS-LS1-3

I keep hearing two different words: nuclei and nucleus! What's the difference?

• Nothing! They are both the same organelle.

• Nuclei is the single form. Meaning just one.

• Nucleus is the plural form. It is referring to more than one.

• All of these answers are true!

What does it mean for cells to be specialized?

• They have a specific shape to help them perform a certain job. (Form fits function!)

• An example includes how red blood cells are shaped to fit into our blood vessels.

• An example includes how neurons (nerve cells) extend in our body to transmit signals to our brain.

• All of these answers are correct!

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NGSS.MS-LS1-2

 A group of cells that have similar functions? Examples are nervous, epithelial, and muscle.

• cells
• tissues
• organs
• atoms

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NGSS.MS-LS1-3

How are multicellular organisms organized?

• They're not!

• The organization of cells, tissues, organs, and systems in a hierarchy, which means smallest to biggest!

• The arrangement of cells in a linear order

• The random distribution of cells in an organism

What makes up the nervous system?

• Only the brain

• Only the spinal cord

• The brain and heart

• The nerve cells, nerve tissue, the spinal cord, and the brain.

FLASHBACK! Check all of the following that are organelles found in animal cells.

• chloroplast

• mitochondria

• cell membrane

• cell wall

• nucleus

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NGSS.MS-LS1-2

Which of the following is the correct order of the levels of organization from smallest to largest?

• organ system, organ, tissue, cell

• tissue, organ system, cell, organ

• cell, tissue, organ, organ system