Discovering Cells

Unlike Hooke, Leeuwenhoek observed cells that

• had no cell walls

• came from plants

• were alive

• could only be seen with a compound microscope

How does magnification occur in an electron microscope?

• an electron beam creates an image

• an electron beam makes the object become larger

• light is changed into electrons by a convex lense

• light is reflected by an electron beam.

The invention of the microscope made it possible for people to discover

• plants

• skin

• animals

• cells

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Which of the following statements is part of cell theory?

• only plants are composed of cells

• all cells are produced from other cells

• cells can be produced from nonliving matter

• cells are one of several basic units of structure and function of organisms.

What does the term resolution refer to?

• how well structures close together can be distinguished

• how large an image can be

• how many lenses a microscope uses

• how much light is needed to see an image

A microscope allowed Hooke to see "tiny rectangular rooms" which he called

• bacteria

• cells

• animalcules

• archae

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A light microscope that has two or more lenses is called a(n) ___________ microscope.

• double lens scope

• electron microscope

• proton microscope

• compound microscope

A cell's functions include obtaining food and water and getting rid of ____________.

• waste

• oxygen

• energy

• DNA

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The _____________ describes how cells are related to living things.

• cell theory

• multicellular clause

• magna carta

• hypothesis of evolution

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A compound microscope with a 10X eyepiece and a 40X objective has a magnification of _________.

• 10X

• 40X

• 50X

• 400X