Q2 Grade Recovery

In which part of the cell does the Calvin cycle take place?

• Mitochondria

• Cytoplasm

• Thylakoid membrane

• Stroma

Answer explanation

The Calvin cycle occurs in the stroma of chloroplasts, where it uses ATP and NADPH produced in the thylakoid membranes to convert carbon dioxide into glucose. Thus, the correct answer is stroma.

During cellular respiration, glucose is broken down into which of the following?

• Oxygen and water

• Carbon dioxide and water

• ATP and oxygen

• NADPH and ATP

Answer explanation

During cellular respiration, glucose is metabolized to produce energy, resulting in the formation of carbon dioxide and water as byproducts. Therefore, the correct answer is carbon dioxide and water.

Tags

NGSS.HS-LS1-7

What is the role of ATP in cellular respiration?

• It acts as a reactant

• It stores and transfers energy

• It breaks down glucose

• It releases carbon dioxide

Answer explanation

ATP stores and transfers energy within cells, making it essential for cellular respiration. It does not act as a reactant, break down glucose, or release carbon dioxide.

Tags

NGSS.HS-LS1-7

Which molecule is the main energy carrier in cells?

• NADPH

• ATP

• Glucose

• FADH2

Answer explanation

ATP (adenosine triphosphate) is the primary energy carrier in cells, providing energy for various cellular processes. While NADPH, glucose, and FADH2 play roles in metabolism, ATP is specifically known for its direct energy transfer.

Tags

NGSS.HS-LS1-7

What is the main purpose of the Calvin cycle?

• To produce ATP

• To convert carbon dioxide into glucose

• To release oxygen

• To absorb sunlight

Answer explanation

The main purpose of the Calvin cycle is to convert carbon dioxide into glucose, which is essential for plant energy and growth. This process occurs in the stroma of chloroplasts and does not directly produce ATP or release oxygen.

Tags

NGSS.HS-LS2-5

Which of the following best describes the role of chlorophyll in photosynthesis?

• It absorbs light energy

• It transports water

• It releases oxygen

• It stores glucose

Answer explanation

Chlorophyll is essential in photosynthesis as it absorbs light energy from the sun, which is then used to convert carbon dioxide and water into glucose and oxygen. Thus, the correct choice is that it absorbs light energy.

Tags

NGSS.HS-LS1-5

Which of the following is a reactant in the process of cellular respiration?

• Oxygen

• Water

• ATP

• NADPH

Answer explanation

Oxygen is a key reactant in cellular respiration, where it is used to help convert glucose into energy. Water and ATP are products of this process, while NADPH is primarily involved in photosynthesis.

Tags

NGSS.HS-LS1-7

Which of the following is a product of the light-dependent reactions of photosynthesis?

• Glucose

• ATP

• Carbon dioxide

• Water

Answer explanation

ATP is produced during the light-dependent reactions of photosynthesis, where light energy is converted into chemical energy. Glucose and carbon dioxide are products of the light-independent reactions, while water is a reactant.

Tags

NGSS.HS-LS1-5

Which stage of cellular respiration produces the most ATP?

• Glycolysis

• Krebs cycle

• Electron transport chain

• Fermentation

Answer explanation

The electron transport chain produces the most ATP during cellular respiration, generating approximately 28-34 ATP molecules through oxidative phosphorylation, significantly more than glycolysis or the Krebs cycle.

Tags

NGSS.HS-LS1-7

Which of the following statements about ATP is true?

• ATP is only used in photosynthesis

• ATP is a long-term energy storage molecule

• ATP releases energy when a phosphate group is added

• ATP releases energy when a phosphate group is removed

Answer explanation

ATP releases energy when a phosphate group is removed, not added. This process occurs during cellular respiration, where ATP is converted to ADP, releasing energy for cellular activities.

Tags

NGSS.HS-LS1-7