Unit 5 Pre-Assessment Quiz

Photosynthesis and cellular respiration are two major processes of carbon cycling in living organisms. Which statement correctly describes one similarity between photosynthesis and cellular respiration?

• A. Both occur in animal and plant cells.

• B. Both include reactions that transform energy.

• C. Both convert light energy into chemical energy.

• D. Both synthesize organic molecules as end products.

A protein in a cell membrane changed its shape to move sodium and potassium ions against their concentration gradients. Which molecule was most likely used by the protein as an energy source?

• A. ATP

• B. ADP

• C. catalase

• D. amylase

Which process uses the products of photosynthesis as reactants?

• A. active transport

• B. cellular respiration

• C. DNA replication

• D. protein synthesis

A scientist observed that during the course of a chemical reaction the number of ATP molecules was reduced. What did the scientist most likely learn from the observation?

• A. The reaction produced water.

• B. The reaction consumed water.

• C. The reaction caused an output of energy.

• D. The reaction required an input of energy.

A cell in the leaf of a green plant performs both photosynthesis and cellular respiration, often at the same time. Which statement best describes how these processes are related to each other?

• A. Both processes produce carbon dioxide.

• B. Both processes require energy directly from the Sun.

• C. Products of one process are used as some of the reactants for the other process.

• D. Thermal energy from one process is used as the energy source for the other process.