AP Biology Practice Test 36

Test Information

Question 12 questions

Time 15 minutes

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Questions 1-3 refer to the following information.

Questions refer to the graph below that plots the temperature of water as a function of heat energy absorbed.

1. Which state of matter does the line labeled X represent?

2. Which of the following best describes the water during the periods indicated by W and Y as the graph progresses from left to right?

3. Which part of the graph represents the cooling effect of sweating?

4. High fructose corn syrup (HFCS) is a sweetener containing fructose that is derived from corn starch and often added to soft drinks. Which of the following reactions would most likely be involved in the production of HFCS? (The letter "n" indicates multiple copies of a molecule in a polymer.)

5. Microtubules are protein filaments assembled from tubulin protein subunits. The chemical colchicine prevents the assembly of microtubules by binding to tubulin protein subunits. Which of the following cellular processes would be most impaired by the application of colchicine?

6. The data in the following table compare the DNA sequences of a short segment of DNA from five species (J, K, L, M, and N). The number of nucleotide differences between each pair of species was determined, then divided by the total number of nucleotides in the segment and multiplied by 100.

SpeciesJKLMN
J02062414
K028830
L01812
M034
N0

Which of the following phylogenetic trees best represents the evolutionary relationships of the five species presented in the table?

7. In the following figures, a phospholipid is represented by two lines attached to a circle. The circle represents the phosphate group, and the two wavy lines represent the fatty acids. When immersed in water, which of the following shows the expected orientation of the phospholipids?

8. The end product of the alcohol fermentation pathway is the alcohol ethanol. A considerable amount of energy still remains in ethanol, yet ethanol is a waste product for the yeast cells that produce it. What, then, is the purpose of fermentation?

9. In a laboratory exercise, a student cuts disks of plant leaves and puts them in a beaker of water. To help submerge the leaves, a drop of soap is added to the water. How does the soap help submerge the leaf disks?

Questions 10-12 refer to the following information.

Enzyme E regulates the reaction J → K + L. The following graph shows the progress of this reaction after the enzyme is mixed with J.

10. The reaction maintains its maximum rate during the interval from 6 to 9 minutes. Which of the following best explains why the reaction is limited to the observed rate?

11. Which of the following best explains the progress of the reaction after 15 minutes?

12. Which of the following actions is most likely to cause the reaction to generate additional amounts of product K and L?