Self-Assessment

Cell Structure and Function

Click the button next to the response that best answers the question.

1. An element is

• any substance that cannot be broken down into simpler substances.
• formed by chemically combining two or more compounds.
• any substance that contains carbon.
• formed during the food-making process that takes place in plants.

2. Which statement is NOT part of the cell theory?

• All living things are composed of cells.
• Cells are the basic units of structure and function in living things.
• All living things must have more than one cell.
• All cells are produced from other cells.

3. What happens to the shape of a red blood cell when it is placed in a solution with a high salt concentration?

• It doesn't change.
• It swells as water moves into the cell.
• It shrinks as water moves out of the cell.
• It swells as water moves out of the cell.

4. Who was the first scientist to observe cells?

• Anton von Leeuwenhoek
• Robert Hooke
• Matthias Schleiden
• Rudolf Vircow

5. Active transport is the movement of

• materials though a cell membrane using cellular energy.
• water molecules through a selectively permeable membrane.
• materials from an area of higher concentration to an area of lower concentration.
• oxygen molecules across the cell membrane.

6. Who was the first scientist to observe cells?

• Anton von Leeuwenhoek
• Robert Hooke
• Matthias Schleiden
• Rudolf Vircow

7. Cells in many-celled organisms

• often differ greatly from each other.
• all have the same structure.
• are all the same sizes.
• never perform the same function.

8. Osmosis is an example of

• active transport.
• passive transport.
• engulfing.
• streaming.

9. Which organelle is referred to as the control center of the cell?

• ribosome
• Golgi body
• mitochondria
• nucleus

10. The passive transport of a molecule from the inside of a cell to the outside occurs when

• the concentration of the molecule inside the cell is higher than outside.
• the concentration of the molecule inside the cell is lower than outside.
• the concentration of the molecule inside the cell is the same as outside.
• a transport protein carries the molecule from the inside of a cell to the outside.