Laboratory Experiment Review Questions for AP Biology (page 2)

By — McGraw-Hill Professional
Updated on Oct 24, 2011

Answers and Explanations

  1. B—The water will flow into the dialysis bag because the solute concentration in the bag is higher than that of the beaker. This creates an osmotic driving force that moves water into the bag in an effort to equalize the discrepancy in solute concentrations.
  2. D—The rate of reaction can be approximated by calculating the slope of the straight portion of the graph. In this case it is 15 μmol of product produced in 5 minutes for an approximate rate of 3 μmoles/min.
  3. A—The distance between the gene and the centromere in Sordaria is determined by adding up the number of crossovers that occur and dividing that by the number of offspring produced. This quotient should be multiplied by 100, and that product represents the percent of the offspring that experienced crossover. This percentage should be divided by 2 to obtain the distance from the centromere to the gene of interest.
  4. Answers and Explanations

  5. C—The factors that increase the rate of transpiration are high light intensity, high temperature, low humidity, and high airflow.
  6. D—The more current you put through the gel, the faster the DNA will migrate. Adding more DNA will result in thicker bands. Reversing the positive and negative ends will swap the direction in which the DNA migrates. Running the gel for a longer amount of time will increase the distance that the DNA fragments travel, and increasing the temperature really won't have too much of an effect.
  7. B—This is an example of genetic drift, in which a random chunk of the population is eliminated resulting in a potential change in the frequencies of the alleles being studied.
  8. AQ10 = (heart rate at higher temperature) ÷ (heart rate at lower temperature). The Q10 for answer A is 1.33; answer B, 0.75; answer C, 1.16; answer D, 0.86; answer E, 1.00.
  9. C—Gross primary productivity (GPP) = net primary productivity (NPP) + respiration rate (RESP). Because this question asks the value of the net primary productivity, GPP – RESP = NPP. 500 – 200 = 300.
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