SB1d Quiz

Small, uncharged substances enter and leave the cell membrane through the process of

• endocytosis.

• simple diffusion.

• active transport.

• facilitated diffusion.

Transport of materials into a cell against a concentration gradient, from low to high, requires

• water

• energy

• osmosis

• a passageway

When a raw, shell-less egg was placed in sugar solution, the egg shrank. The egg was brought back to its original size by placing it in water. Which process does the experiment demonstrate?

• osmosis

• diffusion

• dehydration

• reverse osmosis

A plant cell remains unchanged in shape or size when it is kept in a solution. What kind of solution is it?

• water

• isotonic

• hypotonic

• hypertonic

During diffusion, molecules move

• in no predictable pattern.

• to points equidistant from the point of origin.

• from lower concentration to higher concentration.

• from higher concentration to lower concentration.

Describe the movement of molecules in the illustration.

• Molecules are moving from a lower concentration to a higher concentration.

• Molecules are moving from a higher concentration to a lower concentration.

• Molecules are moving from a higher concentration to a lower concentration and then from a lower to higher concentration.

• Molecules are moving from a lower concentration to a higher concentration and then from a higher concentration to a lower concentration.

Active transport occurs in cells, for example, when the Na-K pump is at work. Any process that involves active transport most often involves the

• movement of molecules without any predictable pattern.

• movement of molecules from a lower concentration to a higher concentration.

• movement of molecules from a higher concentration to a lower concentration.

• movement of molecules from a lower to higher concentration and then back to the point of origin.

Cell drinking; cell eating. Both are modeled here and are examples of

• osmosis

• diffusion

• endocytosis

• facilitated transport

Some inquisitive students found two slugs and wanted to take them to science class. The only container they could find was a used potato chip bag. The students stored the slugs in the bag to take to school the next day, When the students opened the bag at school, they found that the slugs had melted and turned to slime. Explain why this happen?

• The slugs had an defensive reaction to the salt, and the slime was a response to that reaction.

• The salt around the slugs created a hypotonic environment, which caused water to diffuse into cells and made them undergo cytolysis.

• The salt around the slugs created a hypertonic environment, which caused water to diffuse out of cells and the cells will shrink.

• The salt around the slugs created an isotonic environment, which caused water to diffuse out of and into the cells which made the slugs melt.

A lab group in biology class wanted to model cell transport. The students massed the tuber slices, placed them into sucrose solutions, and let them soak. The masses were taken the next day. What statement is best supported by the data from this experiment?

• As sucrose moved out of the tuber cells, the tubers gained mass.

• The tubers in the 0.6 molar solution lost the most water from their cells.

• The tubers in the 0.8 molar solution gained as much water as those in the 0.4 molar solution.

• As the sucrose concentration decreased, the mass of the tubers increased as water moved into the tuber cells.