Understanding Cells and Organisms

Which statement correctly tells why the cells of unicellular and multicellular organisms divide?

• The cells of both kinds of organisms divide to reproduce.

• The cells of both kinds of organisms divide to replace cells and to grow.

• The cells of unicellular organisms divide to replace cells and to grow; those of multicellular organisms divide to reproduce.

• The cells of unicellular organisms divide to reproduce; those of multicellular organisms divide to replace cells and to grow.

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NGSS.MS-LS3-2

Prem finds an unusual object on the forest floor. After he examines it under a microscope and performs several lab tests, he concludes that the object is a living thing. Which of these observations most likely led to Prem’s conclusion?

• The object contained carbon.

• Prem saw cells in the object.

• The object had a green color.

• Prem saw minerals inside the object.

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NGSS.MS-LS1-1

Some organisms consist of one cell. Other organisms consist of multiple cells. Which of these is true of cells in a multicellular organism?

• All cells have the same function.

• Every cell has a different function.

• Different types of cells have the same function.

• Different types of cells have different functions.

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NGSS.MS-LS1-3

If you were to compare the function of a cell to the function of parts of a house, which part of the house would match a cell?

• roof

• bricks

• air conditioner

• plumbing system

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NGSS.MS-LS1-2

Which of these statements is not one of the characteristics of cells?

• They are best viewed under a microscope.

• All nonliving things are made up of cells.

• They can only be produced by other living cells.

• They can make up both unicellular and multicellular organisms.

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NGSS.MS-LS1-1

One part of the cell theory states that all living things are made up of one or more cells. Scientists had to find ways to test this theory. Which investigation could scientists use to test this part of cell theory?

• heat plant or animal tissue on a hot plate

• test plant or animal tissue with a pH meter

• examine plant or animal tissue with a microscope

• measure the mass of plant or animal tissue with a scale

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NGSS.MS-LS1-1

Which of these structures surround cells?

• cell wall and nucleus

• cell membrane and cell wall

• cytoplasm and cytoskeleton

• cell membrane and cytoplasm

What two features do eukaryotes have that prokaryotes do not have?

• cell wall and ribosomes

• nucleus and genetic material

• membrane-bound organelles and nucleus

• membrane-bound organelles and genetic material

Under a high-powered microscope, Dan sees a cellular organelle. The organelle has a double membrane, and the inner membrane is folded. Which organelle does Dan see?

• nucleus

• ribosome

• mitochondrion

• endoplasmic reticulum

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NGSS.MS-LS1-2

Eukaryotic cells and prokaryotic cells have some parts in common. Which of these pairs of parts would you find in both types of cells?

• cytoplasm and nucleus

• cell membrane and cytoplasm

• genetic material and membrane-bound organelles

• cell membrane and membrane-bound organelles