Living Environment Regents Diffusion

The diagram below shows specialized plant cells that control openings called stomates. The proper function of these cells is vital to the survival of the plant because they regulate the

• rate of glucose use by root cells

• absorption of sunlight by leaf cells

• products of photosynthesis in the stem

• exchange of gases in leaves

Tags

NGSS.MS-LS2-3

Lymphatic capillaries are found throughout the body. Both the lymphatic and circulatory systems transport substances between the bloodstream and body tissues. These two systems are also involved in fighting infections. The arrows shown in the diagram that go from the blood capillaries to the interstitial fluid most likely represent the

• release of red blood cells, so that they can diffuse into body cells and fight bacteria

• movement of materials from the circulatory system that will eventually enter lymphatic capillaries

• transport of digestive enzymes from the blood to help with the digestion of glucose in muscle cells

• transport of glucose molecules from the blood to be used by cells to attack proteins and fats

Tags

NGSS.MS-LS1-3

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 movement of molecules from side A to side B is an example of the process of

• active transport

• chromatography

• cellular respiration

• diffusion

If a 20% salt solution is put into dialysis tubing & added to a beaker of distilled water - what way will the water move?

• The water will move into the cell / dialysis tubing.

• Into the beaker

Tags

NGSS.MS-PS1-2

Which molecule did not diffuse through the membrane?

• Glucose

• Indicator

• Starch

• Water

Which process is primarily responsible for the movement of oxygen from the lungs into the bloodstream?

• Osmosis

• Active transport

• Diffusion

• Facilitated diffusion

In an experiment, a student places a cell in a solution and observes that the cell shrinks. What can be concluded about the solution?

• The solution is isotonic to the cell.

• The solution is hypertonic to the cell.

• The solution is hypotonic to the cell.

• The solution is at equilibrium with the cell.

Which of the following best describes the role of the cell membrane in diffusion?

• It acts as a barrier to all substances.

• It allows all substances to pass freely.

• It regulates the movement of substances in and out of the cell.

• It only allows water to pass through.

A student observes that a drop of food coloring spreads out in a glass of water. Which process is this an example of?

• Osmosis

• Diffusion

• Active transport

• Filtration