Chapter 16.3 In Class Quiz Review

Elizabeth is conducting an investigation to study how molecules are transported into and out of a cell. Elizabeth builds a model of a cell using a U-shaped tube. A barrier, which is permeable to water, but not sugar, is placed on the bottom of the tube to model the cell membrane. Elizabeth adds two different solutions to each side of the tube. The solute in each solution is sugar and the solvent is water. The initial levels of solution in Side A and Side B are equal. The concentration of sugar in Side A is lower than the concentration of sugar in Side B.

What is Elizabeth likely to observe?

• Water molecules will move from Side A to Side B. The solution level on Side A will fall and the solution level on Side B will rise.

• Sugar molecules will move from Side A to Side B. The solution level on Side A will fall and the solution level on Side B will rise.

• Water molecules will move from Side B to Side A. The solution level on Side A will rise and the solution level on Side B will fall.

• Sugar molecules will move from Side B to Side A. The solution level on Side A will rise and the solution level on Side B will fall.
  
  

Which are examples of active transport across the cell membrane?

• diffusion and facilitated diffusion

• osmosis and chemiosmosis

• endocytosis and exocytosis
  

• osmosis and diffusion

Wes places red blood cells in a petri dish with pure water and observes them under a microscope. He drew a model to illustrate his observations.

What is the most likely explanation for Wes’s observations?

• The red blood cells were placed in a hypotonic solution. Water moved from the outside of the cells to the inside of the cells until the cells burst.

• The red blood cells were placed into an isotonic solution. Water moved into and out of the cells to maintain homeostasis.

• The red blood cells were placed into an isotonic solution. Water moved into the cells until the cells burst.

• The red blood cells were placed in a hypertonic solution. Water moved from the inside of the cells to the outside of the cells to maintain homeostasis.

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The pancreas produces enzymes that aid in digestion. By what process are these digestive enzymes excreted from pancreas cells?

• osmosis

• exocytosis

• endocytosis

• diffusion

The movement of matter across a cell membrane against a concentration gradient is called ​ (a)   and requires ​ (b)   .

• active transport
• energy
• passive transport
• facilitated diffusion
• osmosis
• homeostasis
• osmotic pressure

The model illustrates a process by which a substance is taken up by a cell.

Which statements describe the process? Select the correct answer.

• The cell wall shown in the model is changed into a cell membrane.

• The process shown in the model requires energy from the cell.

• The cell membrane in the model remains intact throughout the process.

• The model shows the process of facilitated diffusion.

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Diffusion moves molecules from an area of ​ (a)   to an area of ​ (b)   .

• higher concentration
• lower concentration

Match the following.

• Hypotonic

• Solution in which there is less solute outside of the cell (less water outside). Cell loses water.

• Hypertonic

• Solution in which there is LESS solute outside of the cell (more water outside). Cell gains water and may burst if it doesn't have a cell wall.

• Isotonic

• Solution in which both inside and outside of the cell have the same concentrations of water/solute.

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Where is there a high concentration of water?

• in the flower
• cannot be determined by picture.
• in the vase
• in the leaves

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The diagram shows the semipermeable membrane of a cell and the concentration of solutions inside and outside the cell. Which of the following statements best describes how the molecules will move?   

• Water molecules will move out of the cell 
• Water molecules will move into the cell 
• Solute molecules and water molecules will move out of the cell 
• Solute molecules and water molecules will move into the cell 

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