Biology

Cellular Respiration and Enzymes

1,551 Questions

Explore key concepts of cellular respiration, including glycolysis, the Krebs cycle, and the electron transport chain. These questions also cover ATP production, anaerobic respiration, and essential metabolic pathways. This topic forms a core part of the biology syllabus for many competitive examinations.

Glycolysis and metabolic pathwaysKrebs cycle processesElectron transport chainATP production countAnaerobic respiration products

Cellular Respiration and Enzymes Questions

Multiple choice

Which of the following is NOT correctly matched?

  1. Oxidoreductases: Catalyze oxidation/reduction reactions

  2. Lyases: Catalyze the hydrolysis of various bonds

  3. Isomerases: Catalyze isomerization changes within a single molecule

  4. Ligases: Join two molecules with covalent bonds
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lyases is a class of enzymes, which cleave various bonds by means other than hydrolysis and oxidation. Hydrolases is a class of enzymes, which catalyze the hydrolysis of various bonds.

Multiple choice

In sodium-potassium pump, the event of dephosphorylation occurs when

  1. 3 Na+ ions bind to the active site of the pump

  2. 2 molecules of K+ bind to the pump at their respective binding sites

  3. hydrolysis of ATP takes place after Na+ ions bind to ATP

  4. K+ ions are transported into the cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When the pump binds two molecules of K+ to their respective bonding sites on the extracellular face of the transport protein, dephosphorylation of the pump occurs.

Multiple choice

The Mitchell or chemiosmotic hypothesis conclude the ____________.

  1. absence of ATP in inner mitochondrial membrane

  2. presence of increased pH in endoplasmic reticulum than in cytosol

  3. production of ATP as the protons flow along slop across the inner mitochondrial membrane

  4. symmetrical dispersion of ATP ase of inner mitochondrial membrane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mitchell or chemiosmotic hypothesis coupling in phosphorylation is tested in light of experimental data on oxidative phosphorylation. It predicts production of ATP as the protons flow along slop across the inner mitochondrial membrane 

Multiple choice

Which of following observations highly supports the view that mitochondria possess electron transport system enzymes?

  1. Disruption of mitochondria harvest membrane fragments that are capable of synthesising ATP.

  2. Mitochondria possess a characteristic to concentrate within cells that produce locomotory structures.

  3. Mitochondria posses a folded inner membrane.

  4. A contractile protein able to utilise ATP is get from mitochondria.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Disruption of mitochondria harvest membrane fragments that are capable of synthesising ATP. This observations highly support the view that mitochondria possess electron transport system enzymes.

Multiple choice

Mitochondria causes maximum cell’s supply of ATP and their quantity within a cell is simply associated with metabolic activity. Cellular respiration is performed out of the mitochondria. Mitochondrial matrix composed of variety of enzymes that play a major part in metabolic pathway. These involve carbohydrate, lipid, amino acids, urea & heme biosynthesis.

Mitochondrial morphology is controlled by balancing active absorption of water & active secretion by mitochondrion. Hence, mitochondria swell in__________.

  1. uncoupling agent

  2. uncoupling catalysing oxidative phosphorylation

  3. ATP

  4. hypertonic solution

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mitochondrial morphology is controlled by balancing active absorption of water and active secretion by mitochondrion. Hence, mitochondria swell in uncoupling agent.

Multiple choice

Mitochondria causes maximum cell’s supply of ATP and their quantity within a cell is simply associated with metabolic activity. Cellular respiration is performed out of the mitochondria. Mitochondrial matrix composed of variety of enzymes that play a major part in metabolic pathway. These involve carbohydrate, lipid, amino acids, urea and heme biosynthesis.

Which of following mechanism is utilised by mitochondria to transform energy in cellular metabolism?

  1. Mitochondria trap chemical energy and reserve it in form of high energy lipid bonds.

  2. Transfer of electrons from NADH to O2 occurs in inter membrane space.

  3. Mitochondria control an electrochemical protein gradient which represents stored energy.

  4. The respiratory chain pumps protons into mitochondrial matrix.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mitochondria is membrane-closed structure present in maximum eukaryotic cells control an electrochemical protein gradient, which represents stored energy.

Multiple choice

Which of the following processes is a substrate level phosphorylation?

  1. Transfer of phosphoryl group from substrate to ADP

  2. Transfer of phosphoryl group from ATP to substrate

  3. Addition of phosphoryl group to nucleoside to form nucleotide

  4. Only 1 and 2

  5. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Transfer of phosphoryl group from substrate to ADP (Adenosine di nucleotide) result the formation of ATP (Adenosine trinucleotide) is called substrate level phosphorylation.