AP Bio Ch 7 Review

Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?

• CO₂
• Glucose
• An Amino Acid
• Starch

Which of the following is a characteristic feature of a carrier protein in a plasma membrane?

• It is a peripheral membrane protein.
• It requires the expenditure of cellular energy to function.
• It works against diffusion.
• It exhibits a specificity for a particular type of molecule.

When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur?

• The cell will burst.
• The cell membrane will lyse.
• The cell will become turgid.
• The cell will become flaccid.

Ions diffuse across membranes through specific ion channels

• down the osmotic potential gradients.
• down their electrochemical gradients.
• down their chemical gradients.
• down the electrical gradients.

An organism with a cell wall would most likely be unable to take in materials through

• diffusion.
• facilitated diffusion.
• phagocytosis.
• active transport.

The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (NaCl), and side B is filled with a solution containing 0.8 M glucose and 0.4 M sodium chloride. Initially, the volume in both arms is the same. At the beginning of the experiment, 

• side A is hypertonic to side
• side A is hypotonic to side B.
• side A is hypertonic to side B with respect to glucose.
• side A is isotonic to side B.

The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (NaCl), and side B is filled with a solution containing 0.8 M glucose and 0.4 M sodium chloride. Initially, the volume in both arms is the same. If you examine side A after three days, you should find

• a decrease in the concentration of NaCl and glucose and an increase in the water level.
• no net change in the system.
• a decrease in the concentration of NaCl and a decrease in the water level.
• a decrease in the concentration of NaCl, an increase in water level, and no change in the concentration of glucose.

Tags

NGSS.HS-LS2-4

NGSS.HS-PS1-5

Five dialysis bags, constructed from a semipermeable membrane that is impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed) and the percent change in mass of each bag was graphed.Which line in the graph represents the bag with the highest initial concentration of sucrose?

• A
• B
• D
• E

Tags

NGSS.HS-PS1-5

Which of the following factors would tend to increase membrane fluidity?

• a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses
• a lower temperature
• a relatively high protein content in the membrane
• a greater proportion of unsaturated phospholipids

Which of the following processes includes all others?

• diffusion of a solute across a membrane
• osmosis
• passive transport
• facilitated diffusion