SAT Subject Biology Practice Question 329: Answer and Explanation
19. Three different cell types were observed under the microscope. The observations are summarized in 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.
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
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).