Cell: Parts

A ______ is the smallest unit of life.

• cell

• atom

• tissue

• organ

Which of the following best describes the function of a cell?

• It is only a structural unit

• It carries out metabolic activities essential for life, as well as specialized functions, and adapts to changing conditions

• It does not adapt to changing conditions

• It only forms tissues

Cells interact to form ______, organs, and organ systems.

• tissues

• molecules

• cells

• atoms

The human body consists of 30 trillion cells that vary considerably in shape and size, yet have much in common.

• True

• False

Differences in cell ______ and arrangement make different functions possible.

• shape

• color

• temperature

• weight

Which of the following is an example of a cell's specialized function?

• Nerve cells have long extensions that conduct electrical impulses

• Epithelial cells in the mouth are flat, thin, and densely packed to provide a protective barrier

• Both A and B

• None of the above

______ control a cell’s actions and responses.

• Genes

• Mitochondria

• Ribosomes

• Enzymes

What is a composite cell?

• A cell that includes many different cell structures, but no cell contains all of them.

• A cell that only contains a single type of organelle.

• A cell that is found only in plants.

• A cell that cannot divide or reproduce.

Within the cytoplasm are specialized organelles that perform specific functions for the cell. What are these specialized structures called?

• Organelles

• Chromosomes

• Enzymes

• Ribosomes

Organelles are suspended in a fluid called the ________.

• cytosol

• nucleus

• mitochondria

• ribosome