SAT Subject Biology Practice Question 329: Answer and Explanation

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Question: 329

19. Three different cell types were observed under the microscope. The observations are summarized in Table 1.

Table 1

The three cell types were grown in separate cultures with plenty of oxygen and nutrients available. Figure 1 shows their rates of growth. At Time 1, oxygen was no longer available to the cells.

Figure 1

Which of the following equations is cell Type C able to run?

I. C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + ATP

II. H2O + light → O2 + ATP + NADPH

III. 6 CO2 + 6 H2O + ATP + NADPH → C6H12OA. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III

Correct Answer: E

Explanation:

E Cell Type C has a nucleus, a cell wall, and chloroplasts and therefore most likely comes from a plant. Equations II and III are the equations for photosynthesis and would occur in plants (choices A, B, and C are eliminated), and equation I is the equation for cellular respiration, which also occurs in plants (choice D is eliminated).

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