Cell Transport Quiz

Cell membranes are said to be selectively permeable. Which statement best explains what selectively permeable means?

• The cell membrane prevents any harmful substance from entering the cell.

• The cell membrane lets certain substances enter the cell and keeps certain substances out of the cell.

• The cell membrane allows only large molecules to diffuse into the cell.

• The cell membrane has pores that let only water and glucose into the cell and carbon dioxide out.

The processes of diffusion and active transport are both used to

• break down molecules to release energy

• move molecules into or out of cells of the body

• bring molecules into cells when they are more concentrated outside of the cell

• move molecules against a concentration gradient, using ATP molecules

The diagram below represents a cell in water. Formulas of molecules that can move freely across the cell membrane are shown. Some molecules are located inside the cell and others are in the water outside the cell. Based on the distribution of these molecules, what would most likely happen after a period of time?

• The concentration of O₂ will decrease inside the cell.

• The concentration of CO₂ will remain the same inside the cell.

• The concentration of O₂ will remain the same outside the cell.

• The concentration of CO₂ will increase outside the cell.

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The diagram below represents a cell. Oxygen molecules (O₂) can move freely across the cell membrane are shown. Some molecules are located inside the cell and others are in the water outside the cell. Based on the distribution of these molecules, what would most likely happen after a period of time?

• The O₂ molecules will move into the cell.

• The O₂ molecules will move out of the cell.

• The O₂ molecules will remain in the same place.

• The O₂ molecules will get closer together.

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If frog eggs taken from a saltwater marsh are placed in a freshwater aquarium, what will most likely happen?

• Water will leave the eggs.

• Salt will leave the eggs.

• Water will neither enter nor leave the eggs.

• The eggs will burst.

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Water is important for all cells. In this figure, water is entering the cell. Which of the following best describes how water is entering the cell?

• Osmosis, a type of active transport

• Osmosis, a type of passive transport

• Facilitated diffusion, a type of active transport

• Facilitated diffusion, a type of passive transport

The diagram below represents movement of a large molecule across a membrane. Which process is best represented in this diagram?

• active transport

• diffusion

• protein building

• gene manipulation

Red onion cells undergo the change represented in the diagram below. This change is most likely caused by the cell being transferred from

• distilled water to starch indicator

• distilled water to salt water

• salt water to tap water

• salt water to distilled water

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Method A is classified as _________________. Base your answer on the diagram and your knowledge of biology.

• Simple diffusion

• Facilitated diffusion

• Active transport

• Photosynthesis

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Method C is classified as _________________. Base your answer on the diagram and your knowledge of biology.

• Simple diffusion

• Facilitated diffusion

• Active transport

• Photosynthesis