Lab 18

Explain why the diffusion of vinegar into the agar cubes caused the observed color change.

• The vinegar reacts with the agar, causing a chemical change.

• The vinegar changes the pH of the agar, leading to a color change.

• The vinegar absorbs the color from the agar.

• The vinegar evaporates, leaving a residue that changes color.

What evidence is there that the vinegar diffused into each cube at the same rate?

• The cubes changed color uniformly.

• The cubes remained the same size.

• The vinegar evaporated quickly.

• The cubes dissolved completely.

Which cube has the greatest surface area?

• 3cm cube

• 2cm cube

• 1cm cube

Describe what happens to the surface area as a cell grows larger.

• The surface area increases proportionally with the volume.

• The surface area increases, but not as quickly as the volume.

• The surface area decreases as the cell grows larger.

• The surface area remains constant as the cell grows larger.

Describe what happens to the volume as a cell grows larger.

• The volume increases as the cell grows larger.

• The volume decreases as the cell grows larger.

• The volume remains the same as the cell grows larger.

• The volume fluctuates as the cell grows larger.

Describe what happens to the surface area to volume ratio as a cell grows larger.

• The surface area to volume ratio increases.

• The surface area to volume ratio decreases.

• The surface area to volume ratio remains constant.

• The surface area to volume ratio fluctuates.

If we think about the analogy of a cube to a cell, the surface area of a cell is the ​ ​ ​ ​ (a)   and the volume of a cell is the​ (b)   .​

• cytoplasm.
• nuclear membrane
• cell wall
• centrioles

Is diffusion more efficient over shorter or longer distances?

• Short distance

• Long distance

• Same efficiency with short and long distances

Name three important molecules that travel through cells by diffusion, osmosis or facilitated diffusion

• carbon dioxide

• oxygen

• water

• protein

EVilli and Microvilli have long thin appendages coming off a core part of the cell. What is the impact of those thin appendages on the cells' characteristics?

• The thin projections greatly decrease the surface area of the cells.

• The thin projections greatly increase the volume of the cells.

• The thin projections greatly increase the surface area of the cells.

• The thin projections greatly decrease the volume of the cells.