AP Biology Practice Test 17

Test Information

Question 13 questions

Time 16 minutes

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1. The following reaction occurs in the citric acid cycle. Study the reaction as it is shown here.

Which of the following statements is correct?

2. Which of the following statements is correct about a man who has hemophilia and whose wife does not have the disease and who does not have any relatives with the disease?

3. Identify the phase of meiosis when recombination occurs, and state the reason for your decision.

4. A rooster with gray feathers and a hen with the same phenotype produce 17 gray, 7 black, and 8 white chicks. What is the simplest explanation for the inheritance of these colors in chickens?

5. Hydrangea flowers have one gene for flower color. Plants of the same genetic variety have flowers that range in color from blue to pink with the color varying due to the type of soil in which they are grown. Which of the following statement best explains this phenomenon?

Questions 6-7 refer to the following information.

A female fruit fly hybrid for both gray body (Gg) and normal wings (Nn) is crossed with a male with black body (gg) and vestigial wings (nn): GgNn × ggnn.

The F1 results of the cross are shown in the chart below.

A

B

C

D

Gray normal

Black vestigial

Gray vestigial

Black normal

969

941

190

184

6. Which of the following statements best explains the results?

7. Which of the following sketches depicts the most likely location of the alleles for body color and wing shape?

8. Which of the following is an example of a coupling of an exergonic reaction with an endergonic one?

9. Which of the following statements best describes what this cell will accomplish as part of the immune system?

10. A researcher is experimenting with nerve transmission using neurons from a giant squid. At the beginning of the experiment, the axon is at rest and has a threshold measured at –70 mV at 37oC. The axon receives one stimulus that triggers one action potential in the axon. Subsequent stimuli are much stronger. Which of the following statements explains what happens when several strong stimuli are experienced by the axon?

11. The frequency of a particular allele in a population of 1,000 birds in Hardy-Weinberg equilibrium is 0.3. If the population remains in equilibrium, what would be the expected frequency of that allele after 500 years?

Questions 12-13 refer to the following information.

You carry out an experiment to study transpiration in plants using a two-week-old bean plant. You set up a potometer by cutting the stem of a plant and securing it into clear flexible tubing that has been tightly connected to a calibrated pipette. Water fills the potometer from the plant stem to the tip of the pipette.

You measure water loss from your potometer at 10-minute intervals and plot your data on the graph as Line B.

12. You then explore what happens if you expose the plant to different conditions. Which of the following statements is correct based on proposed changes to the potometer?

13. Which of the following is NOT correct about transpiration in plants?