AP Biology Cellular Respiration

Which process is the largest contributor to the release of CO₂ 

• Citric Acid Cycle or Krebs Cycle

• Pyruvate Oxidation

• Glycolysis

• Oxidative Phosphorylation 

Answer explanation

The Citric Acid Cycle or Krebs Cycle is the largest contributor to the release of CO2.

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Which of the following molecules is NOT a byproduct of cellular respiration? 

• CO₂

• Heat

• H₂O

• ATP

Answer explanation

ATP is not a byproduct of cellular respiration. It is the energy currency of the cell, produced during the process.

Tags

NGSS.HS-LS1-7

If ADP is phosphorylated then what is this indicating in the reaction? 

• ADP is forming into ATP

• ADP is becoming AMP

• ADP is being used to power other reactions

• ADP is being created by the reaction

Answer explanation

Phosphorylation of ADP indicates its conversion into ATP, the correct choice.

Tags

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Why is ATP considered the most significant energy carrying molecule? 

• It's delta G is negative. 

• ATP has different bond energy between its phosphate groups. 

• ATP can hold large amounts of energy between all of its bonds. 

• ATP's positive delta G contributes to the large amounts of energy between its 3rd and 2nd phosphate groups. 

Answer explanation

ATP has different bond energy between its phosphate groups.

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Which process least amount of ATP in cells? 

• Glycolysis

• Citric Acid cycle

• Lactic acid Fermentation

• Pyruvate Oxidation

Answer explanation

Pyruvate Oxidation is the process that least amount of ATP in cells.

Tags

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Which molecule is not an important molecule regarding Cellular Respiration? 

• H₂O

• NADH

• O₂

• CO₂

Answer explanation

CO2 is not an important molecule in cellular respiration as it is a waste product released during the process.

Tags

NGSS.HS-LS1-7

After 5 glucose molecules have been broken down in the cell, which pH value would most likely present the in matrix of the mitochondria. 

• 6

• 2

• 4

• 7

Answer explanation

After the breakdown of 5 glucose molecules, the pH value in the mitochondria matrix would most likely be 6, as it is the correct answer choice.

Tags

NGSS.HS-LS1-7

When NADH is reduced and oxidized, which response best describes what is lost or gained? 

• only Electrons 

• 2 stable Hydrogen atoms 

• Pair of electrons 

• 2 ATP 

Answer explanation

When NADH is reduced and oxidized, 2 stable Hydrogen atoms are gained.

Tags

NGSS.HS-LS1-7

Pyruvate Oxidation creates a specific numbered carbon molecule at the end of it's process. What is the number of carbons for this molecule? 

• 2

• 3

• 6

• 1

Answer explanation

Pyruvate Oxidation creates a 2-carbon molecule at the end of its process. This means that the correct answer is 2.

Tags

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What is the main job of the electron carriers in cellular respiration? 

• Transport electrons and hydrogen atoms to the electron transport chain 

• Capture energy throughout the process of cellular respiration

• Provide the reactants for the process of cellular respiration

• Pump positive hydrogen ions and shuttle electrons across the electron transport chain and contribute to chemiosmosis

Answer explanation

The main job of the electron carriers in cellular respiration is to transport electrons and hydrogen atoms to the electron transport chain.