7. the definition of osmosis is the\na. the movement of solute molecules from a higher concentration to a…

7. the definition of osmosis is the\na. the movement of solute molecules from a higher concentration to a lower concentration.\nb. diffusion of water across a selectively permeable membrane.\nc. likelihood that water will diffuse to a higher water concentration.\nd. movement of water towards a higher water concentration.\n8. when water enters a plant cell\na. the cell bursts. b. the cell undergoes plasmolysis. c. the cell vacuole enlarges.\nd. the cell undergoes crenation.\n9. a reaction catalyzed by a human enzyme was carried out at 20°c. if there is an excess of\nsubstrate, which of the following would cause the greatest increase in the rate of the reaction?\na. lowering the temperature to 10°c.\nb. adding more enzyme and raising the temperature to 30°c.\nc. adding more substrate and raising the temperature to 30°c.\nd. adding more enzyme and lowering the temperature to 10°c\nuse the following diagram to answer question 10.\n10. which of the following conditions would cause the change in the fluid levels as shown\nafter 10 minutes? (solution in side a; solution in side b)\ninitial conditions\nafter 10 minutes\nside a\nside b\nside a\nside b\nmembrane permeable\nmembrane permeable\nto small molecules\nto small molecules\na. solution a is 2% glucose; solution b is 5% glucose\nb. solution a 5% protein; solution b is 2% protein\nc. solution a distilled water; solution b is 5% salt\nd. solution a 2% salt; solution b is 2% salt

7. the definition of osmosis is the\na. the movement of solute molecules from a higher concentration to a lower concentration.\nb. diffusion of water across a selectively permeable membrane.\nc. likelihood that water will diffuse to a higher water concentration.\nd. movement of water towards a higher water concentration.\n8. when water enters a plant cell\na. the cell bursts. b. the cell undergoes plasmolysis. c. the cell vacuole enlarges.\nd. the cell undergoes crenation.\n9. a reaction catalyzed by a human enzyme was carried out at 20°c. if there is an excess of\nsubstrate, which of the following would cause the greatest increase in the rate of the reaction?\na. lowering the temperature to 10°c.\nb. adding more enzyme and raising the temperature to 30°c.\nc. adding more substrate and raising the temperature to 30°c.\nd. adding more enzyme and lowering the temperature to 10°c\nuse the following diagram to answer question 10.\n10. which of the following conditions would cause the change in the fluid levels as shown\nafter 10 minutes? (solution in side a; solution in side b)\ninitial conditions\nafter 10 minutes\nside a\nside b\nside a\nside b\nmembrane permeable\nmembrane permeable\nto small molecules\nto small molecules\na. solution a is 2% glucose; solution b is 5% glucose\nb. solution a 5% protein; solution b is 2% protein\nc. solution a distilled water; solution b is 5% salt\nd. solution a 2% salt; solution b is 2% salt

Answer

7. Osmosis Definition

Brief Explanations:

Osmosis is the movement of water across a selectively permeable membrane. Option A is about solute movement (not osmosis). Option B is incorrect as water moves from higher to lower water concentration (opposite of what it says). Option C is wrong as water moves to higher solute (lower water) concentration. Option D correctly states water moves to higher solute (lower water) concentration.

Answer:

D. Movement of water towards a higher solute concentration.

8. Water Entering Plant Cell

Brief Explanations:

When water enters a plant cell, plant cells have a cell wall that prevents bursting (so A is wrong). Plasmolysis occurs when water leaves (B is wrong). Excretion is not related to water entering (D is wrong). The vacuole, which stores water, enlarges as water enters.

Answer:

C. The cell vacuole enlarges.

9. Enzyme - Catalyzed Reaction Rate

Brief Explanations:

Human enzymes have an optimal temperature (around (37^{\circ}C), but (30^{\circ}C) is closer to optimal than (20^{\circ}C) among the given options). Adding more enzyme (since there is excess substrate) can increase the rate (more active sites for substrate binding). Lowering temperature (A, D) slows down reaction (molecules have less kinetic energy). Adding more substrate (C) won't help as there is already excess substrate.

Answer:

B. Adding more enzyme and raising the temperature to (30^{\circ}C).

10. Fluid - Level Change (Osmosis - like Process)

Brief Explanations:

In the diagram, the fluid level on Side B has risen. This means water has moved from Side A to Side B (osmosis). For water to move to Side B, Side B should have a higher solute concentration.

  • Option A: (5%) glucose (Side B) > (2%) glucose (Side A), water moves to Side B (correct).
  • Option B: Proteins are large molecules. If membrane is permeable to small molecules (as per diagram), protein movement is restricted. So osmosis based on protein concentration is not the case here.
  • Option C: Distilled water (Side A) has lower solute (salt) than (5%) salt (Side B), but the diagram shows movement that would be more consistent with glucose (small molecule) movement as per membrane property (permeable to small molecules, glucose is small, salt is also small but the setup in A is a better fit for the general osmosis - like movement expected in such a problem).
  • Option D: Equal salt concentration (no net osmosis).

Answer:

A. Solution A is (2%) glucose; solution B is (5%) glucose.