Which molecule is metabolized in a cell to produce energy "currency" in the form of ATP?

1.ADP
2.Glucose
3.Carbon dioxide
4.Phosphate

Đang xem: The primary role of oxygen in cellular respiration is to

True or false? The potential energy in an ATP molecule is derived mainly from its three phosphate groups.

1. True
2. False

Which process is not part of the cellular respiration pathway that produces large amounts of ATP in a cell?

1.Krebs cycle
2.Glycolysis
3.Fermentation
4.Electron transport chain

Which step of the cellular respiration pathway can take place in the absence of oxygen?

1.Fermentation
2.Glycolysis
3.Krebs cycle
4.Electron transport chain

Into which molecule are all the carbon atoms in glucose ultimately incorporated during cellular respiration?

1.Carbon dioxide
2.NADH
3.ATP
4.Water

Which of the following statements about the electron transport chain is true?

1.NADH and FADH2 donate their electrons to the chain.
2.Electrons gain energy as they move down the chain.
3.Water is the last electron acceptor.
4.The electron transport chain is the first step in cellular respiration.

Which stage of glucose metabolism produces the most ATP?

1.Glycolysis
2.Krebs cycle
3.Electron transport and chemiosmosis
4.Fermentation of pyruvate to lactate

True or false? The reactions that generate the largest amounts of ATP during cellular respiration take place in the mitochondria.

1. True
2. False

The primary role of oxygen in cellular respiration is to _____.

1. combine with lactate, forming pyruvate
2.yield energy in the form of ATP as it is passed down the respiratory chain
3.combine with carbon, forming CO2
4.act as an acceptor for electrons and hydrogen, forming water

In chemiosmosis, what is the most direct source of energy that is used to convert ADP +Pi to ATP?

1.energy released as electrons flow through the electron transport chain
2.energy released from movement of protons through ATP synthase, down their electrochemical gradient
3.energy released as electrons are transported across the inner mitochondrial membrane
4.energy released from substrate-level phosphorylation

Which metabolic pathway is common to both fermentation and cellular respiration of a glucose molecule?

1.the electron transport chain
2.synthesis of acetyl CoA from pyruvate
3.glycolysis
4.the citric acid cycle
5.reduction of pyruvate to lactate

The final electron acceptor of the electron transport chain that functions in aerobic oxidative phosphorylation is

1.ADP.
2.oxygen.
3.water.
4.pyruvate.
5.NAD+.

Select the correct statement about cellular respiration.
Select the correct statement about cellular respiration.

1.Animals carry out cellular respiration whereas plants carry out photosynthesis.
2.Plants carry out cellular respiration only in organs such as roots that cannot carry out photosynthesis.
3.Cellular respiration and breathing differ in that cellular respiration is at the cellular level, whereas breathing is at the organismal level.

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What process occurs in Box A?

1.electron transport and oxidative phosphorylation
2.the citric acid cycle
3.glycolysis
4,oxidative phosphorylation
5.electron transport

What process occurs within Box B?

1.electron transport and oxidative phosphorylation
2.the citric acid cycle
3.glycolysis
4,oxidative phosphorylation
5.electron transport

Substrate-level phosphorylation occurs _____.

1.In both glycolysis and the citric acid cycle
2.during oxidative phosphorylation
3.in glycolysis
i4.n the citric acid cycle

The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction _____.

1.gains electrons and gains potential energy
2.loses electrons and gains potential energy
3.loses electrons and loses potential energy
4.gains electrons and loses potential energy

Which of the listed statements describes the results of the following reaction?
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy

1.CO2 is reduced and O2 is oxidized.
2.O2 is oxidized and H2O is reduced.
3.O2 is reduced and CO2 is oxidized.
4.C6H12O6 is oxidized and O2 is reduced.

When a glucose molecule loses a hydrogen atom as the result of an oxidation-reduction reaction, the molecule becomes _____.

1.reduced
2.oxidized
3.an oxidizing agent
4.hydrolyzed

When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a proton), the molecule becomes _____.

1.dehydrogenated
2.oxidized
3.redoxed
4.reduced

The oxygen consumed during cellular respiration is involved directly in which process or event?

1.accepting electrons at the end of the electron transport chain
2.the oxidation of pyruvate to acetyl CoA
3.the citric acid cycle
4.glycolysis

In glycolysis, ATP molecules are produced by _____.

1.oxidative phosphorylation
2.cellular respiration
3.substrate-level phosphorylation
4.photosynthesis
5.photophosphorylation

In glycolysis, what starts the process of glucose oxidation?

1.ADP
2.ATP
3.hexokinase
4.NADPH
5.FADH2

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