Read About It "Cell Theory"

Who was the first to observe and describe cells as 'rooms' from cork?

• Antonie van Leeuwenhoek

• Robert Hooke

• Matthias Schleiden

• Rudolf Virchow

Fill in the blank: In 1839, Theodor Schwann observed that all ______ are made up of cells.

• plants

• animals

• bacteria

• fungi

What is the basic unit of structure and function in all living things?

• Atoms

• Cells

• Tissues

• Organs

Fill in the blank: All new cells are made from ________ cells.

• existing

• preexisting

• non-existing

• future

What was the main advantage of the electron microscope developed in the 1930s?

• It was cheaper than previous microscopes.

• It allowed for more detailed observations of cells.

• It was portable.

• It used less energy.

In 1931, Janet Plowe demonstrated that the cell membrane is a physical structure and not a ____.

• chemical compound

• liquid boundary

• energy source

• genetic material

Which of the following is a component of the cell theory?

• A) All living things are made of cells.

• B) Cells can spontaneously generate.

• C) Cells are not the basic unit of life.

• D) Cells do not contain genetic material.

The historical development of cell theory contributed to current research by showing that all living things are made of ____.

• atoms

• molecules

• cells

• tissues