SAT - Biology Subject Cellular Respiration and Photosynthesis Questions and Answers

Question 1

Which of the following correctly compares the primary products of the light-dependent reactions of photosynthesis and the Krebs cycle in cellular respiration?

Accepted Answer

Light-dependent reactions produce ATP and NADPH, while the Krebs cycle produces ATP, NADH, and FADH2.

Answer

Light-dependent reactions produce glucose and O2, while the Krebs cycle produces CO2 and ATP.

Answer

Light-dependent reactions produce ATP and CO2, while the Krebs cycle produces NADH and FADH2.

Answer

Light-dependent reactions produce H2O and O2, while the Krebs cycle produces glucose and ATP.

Question 2

A scientist designs an experiment to measure the rate of photosynthesis in a green alga. She places the alga in a sealed container with a buffered solution and a light source. Which of the following environmental changes would most likely lead to an increase in the rate of O2 production?

Accepted Answer

Increasing the intensity of the white light.

Answer

Decreasing the concentration of CO2 in the container.

Answer

Switching the light source to a green light.

Answer

Lowering the temperature of the solution from 25°C to 10°C.

Question 3

Which statement best describes the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in organic molecules, while cellular respiration releases it.

Answer

Both processes occur exclusively in plant cells.

Answer

The primary function of both processes is to produce oxygen.

Answer

Photosynthesis is an anabolic process, and cellular respiration is also an anabolic process.

Question 4

In the overall equation for cellular respiration, C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP, the oxygen (O2) molecules are primarily used during which stage?

Accepted Answer

The Electron Transport Chain

Answer

Glycolysis

Answer

The Krebs Cycle

Answer

Fermentation

Question 5

An organism that produces its own food using light energy is known as a photoautotroph. This organism serves as a primary producer in an ecosystem. Which of the following is a heterotroph?

Accepted Answer

A mushroom absorbing nutrients from decaying leaves.

Answer

A cyanobacterium in a pond.

Answer

A giant redwood tree.

Answer

A chemosynthetic bacterium near a hydrothermal vent.

Question 6

The Calvin cycle (light-independent reactions) of photosynthesis is responsible for which of the following processes?

Accepted Answer

Fixing carbon dioxide into organic molecules.

Answer

Splitting water molecules to release oxygen.

Answer

Absorbing solar energy using chlorophyll.

Answer

Producing ATP and NADPH.