AP Biology Big Idea 2 Labs Review

Dialysis tubing is permeable to water molecules but not to sucrose. Four dialysis tubes are half filled with 5%, 10%, 20%, and 40% sucrose solutions, respectively, and two dialysis tubes are half filled with distilled water. The dialysis tubes are all sealed at both ends, and the initial masses are determined. Five dialysis tubes are placed into beakers containing distilled water, and the sixth dialysis tube, containing distilled water, is placed into a 40% sucrose solution. The masses of the dialysis tubes are recorded at 30-minute intervals for 90 minutes, as shown in the table above.

A net movement of water into the beaker occurs in which of the following dialysis tubes?

• 3

• 4

• 5

• 6

Dialysis tubing is permeable to water molecules but not to sucrose. Four dialysis tubes are half filled with 5%, 10%, 20%, and 40% sucrose solutions, respectively, and two dialysis tubes are half filled with distilled water. The dialysis tubes are all sealed at both ends, and the initial masses are determined. Five dialysis tubes are placed into beakers containing distilled water, and the sixth dialysis tube, containing distilled water, is placed into a 40% sucrose solution. The masses of the dialysis tubes are recorded at 30-minute intervals for 90 minutes, as shown in the table above.

To model a plant cell, a permeable, nonflexible case is placed around each piece of dialysis tubing. The greatest pressure potential will develop within dialysis tube number

• 2

• 3

• 4

• 5

Simple cuboidal epithelial cells line the ducts of certain human exocrine glands. Various materials are transported into or out of the cells by diffusion. (The formula for the surface area of a cube is 6 x S², and the formula for the volume of a cube is S³, where S = the length of a side of the cube.)

Which of the following cube-shaped cells would be most efficient in removing waste by diffusion?

• A

• B

• C

• D

A common laboratory investigation involves putting a solution of starch and glucose into a dialysis bag and suspending the bag in a beaker of water, as shown in the figure above.

The investigation is aimed at understanding how molecular size affects movement through a membrane. Which of the following best represents the amount of starch, water, and glucose in the dialysis bag over the course of the investigation?

• 
• 
• 
• 

A new species of succulent epiphytic flowering plant was discovered in the canopy of a tropical rain forest. Experiments were carried out to determine the plant’s photosynthetic capacity by measuring the net uptake of carbon dioxide and changes in tissue starch concentration over a 32-hour period with 8 hours of dark at the start and end of the measurement period and 16 hours of moderate light between the two dark periods. The changes in the rate of carbon dioxide uptake and the concentration of tissue starch are shown in the diagram above.

Which of the following is consistent with the data?

• The highest rate of carbon dioxide uptake occurs at the beginning of the light period.

• The highest rate of carbon dioxide uptake occurs at the beginning of the dark period.

• The highest starch concentration occurs at the beginning of the light period.

• The lowest starch concentration occurs at the end of the light period.

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NGSS.HS-LS1-5

NGSS.HS-LS2-5

What most likely causes the trends in oxygen concentration shown in the graph above?

• The water becomes colder at night and thus holds more oxygen.

• Respiration in most organisms increases at night.

• More organisms are respiring at night than during the day.

• Photosynthesis produces more oxygen than is consumed by respiration during the day.

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NGSS.HS-LS1-5

NGSS.HS-LS1-7

NGSS.HS-LS2-3

NGSS.HS-LS2-5

Based on the data shown, calculate the average rate of increase in oxygen consumption for animals acclimated to 5°C as the temperature increases from 10°C to 30°C.

Give the answer in mL O2/g/h/°C to the nearest tenth.

• 1.0

• 5.0

• 7.0

• 20.0

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NGSS.HS-LS2-4

The enzyme phosphofructokinase (PFK) is an allosterically regulated enzyme that catalyzes the following reaction:

Fructose-6-phosphate + ATP → Fructose-1,6-bisphosphate + ADP

The graph shows that at certain concentrations ATP inhibits the enzyme, whereas AMP activates it. According to the information presented in the graph, when the concentration of fructose-6-phosphate is 0.5 mM, how many times more active is PFK in cells with 1 mM ATP + 0.1 mM AMP than in cells with 5 mM ATP? Express your answer to the nearest whole number.

• 5

• 10

• 20

• 30

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NGSS.HS-PS1-5