AP Biology 3.3 Cellular Energy and Common Ancestry

Practise AP Biology 3.3 questions by connecting energy transfer and metabolic coupling with conserved cellular processes across living organisms.

Exam points

explain why living systems require energy input to maintain order and power processes
connect energy-releasing and energy-requiring reactions through metabolic coupling
use conserved glycolysis, signaling or protein features as evidence of common ancestry
calculate ATP energy capture and efficiency from glucose metabolism and account for released heat

Covered syllabus points

3.3.A—Describe the role of energy in living organisms 3.3.B—Explain how shared, conserved, and fundamental processes and features support the concept of common ancestry for…

[Maximum number: 1]

Questions 34-38 A student is investigating photosynthesis in plants. The student planted grass seeds in a tray with three sections and grew the grass under artificial lights for 14 days (Figure 1). After 14 days, the student collected all of the grass from section I and recorded its mass (Table 1). The student then placed a clear cover over section II and placed an aluminum foil cover over section III (Figure 2). The student then placed the tray back under the artificial lights for seven additional days. On day 21, the student collected and measured the mass of the grass from sections II and III (Table 1).

Figure 1. A tray of grass seed, grown under light for 14 days

Figure 2. Modifications made to sections II and III on day 14

TABLE 1. MASS OF GRASS GROWN IN EACH SECTION

Which of the following best explains the connection between energy, growth, and the maintenance of an ordered system in the experiment?

Energy input from light is required for the grass to grow and maintain an ordered structure.

The grass obtains the energy for growth and maintenance of order from nutrients from the soil.

The grass couples the release of energy from the light reactions with the production of oxygen $\left(\mathrm{O}_{2}\right)$ used to produce sugars for growth.

Energy is required for the growth of the grass but not the maintenance of order.

[Maximum number: 1]

Which of the following is evidence that eukaryotes and prokaryotes share a common ancestor?

All eukaryotes and prokaryotes contain linear DNA.

All eukaryotes and prokaryotes contain ribosomes.

All eukaryotes and prokaryotes use organic molecules as an energy source.

All eukaryotes and prokaryotes are capable of mitosis.

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Covered syllabus points

3.3 Cellular Energy question 1

3.3 Cellular Energy question 2