cells unit 9 science test

The picture below shows a type of cell with structure X labeled. What is structure X? *

• The nucleus, identifying this as a eukaryotic cell

• A round piece of genetic material, identifying this as a prokaryotic cell

• A round membrane for food, identifying this as a prokaryotic cell

• The cell wall, identifying this as a eukaryotic cell

The absence of which cell structure would indicate a cell is prokaryotic?

• Cytoplasm

• Cell membrane

• Nucleus

• Ribosomes

After examining hundreds of plants and animals under the microscope, Matthias Jakob Schleiden and Theodor Schwann concluded that all plants and animals

• are difficult to see under a microscope.

• are composed of cells.

• have very little in common.

• have the same type of cells.

Which of the following is true about cells

• They are found in living organisms.

• They are all the same size and shape.

• They are all considered helpful to humans.

• They all have the same function.

The basic units of structure and function for both plants and animals are

• organs

• systems.

• cells.

• tissues.

Katie is working on a project about classifying cells as either prokaryotic or eukaryotic. She is observing a cell under an electron microscope that has a cell wall but does not have a nucleus. How should Katie classify this cell?

• As a eukaryotic cell

• As a prokaryotic cell

• This cell has components of both types of cells

• There is not enough information to classify this cell

All organisms are composed of

• air, because all organism breathe.

• one or more cells, because they are the basic units of life.

• blood, because all organisms have a circulatory system.

• one or more organs, because all organisms are complex.

The picture below shows two types of cells X and Y. Using the picture, it can be determined that X is — *

• prokaryotic, and Y is eukaryotic.

• eukaryotic, and Y is prokaryotic

• prokaryotic, and Y is prokaryotic

• eukaryotic, and Y is eukaryotic.

Scientists believe that all life on Earth is related and probably comes from a single ancestor. Which of the following contributes to the theory that all life comes from a similar ancestor? *

• All life is made from cells

• All life has the ability to think

• All life can perform photosynthesis

• All life has the ability to communicate

Viruses recreate themselves by injecting their RNA into other organisms. They kill the cells of the organisms as they use the organism to aid in their reproductive cycle. A virus does not have a nucleus or other cell parts and is not considered to be a cell. Viruses can remain dormant for many years and can come out of dormancy when they enter the right environment. Why is a virus not considered living? *

• It has an ability to be dormant

• The virus has complex DNA

• It is not made from cells

• It kills the host cells