Biology

Cellular Respiration and Enzymes

1,721 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 zoology respiration in organisms active transport and passive transport types of plant transport atp

The common immediate source of energy for cellular activity is

  1. NAD.

  2. ATP.

  3. DNA.

  4. RNA.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cellular respiration is the set of metabolic processes that take place in the cells. In this process glucose is oxidized through the metabolic pathways like glycolysis in cytoplasm and Krebs's cycle in mitochondria and produces energy in the form of ATP. ATP is further utilized by the different cell for their activities.

Multiple choice zoology respiration in organisms active transport and passive transport types of plant transport atp

The currency of energy in a typical living cell is

  1. ATP molecule.

  2. ADP molecule.

  3. Glucose molecule.

  4. Haemoglobin molecule.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Various metabolic processes in our body utilize ATP as a source of energy. It is considered as energy currency of cells as it stores the chemical energy of food molecules to be utilized as and when required by the body. 

Multiple choice zoology respiration in organisms active transport and passive transport types of plant transport atp

Organisms undergo processes that require energy and produce energy. Processes such as photosynthesis, cellular respiration, reproduction, and movement are just a few of these processes. Which of these best describes the energy available to do cellular work?

  1. Heat

  2. Free energy

  3. Potential energy

  4. Kinetic energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Free energy is the capacity of a system to do work in an exothermic reaction
So, the correct answer is 'Free energy'
Multiple choice zoology respiration in organisms active transport and passive transport types of plant transport atp

Which of the following is called energy currency of the cell?

  1. ATP
  2. NADP$H _2$
  3. $C _6 H _{12}O _6$
  4. $C _2 H _5$OH
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The energy currency of the cell is ATP (Adenosine triphosphate).

During a cellular reaction, all the energy is not released as free energy but some of it is stored in ATP as chemical energy.
The phosphate bonds in ATP are high energy bonds and they are broken whenever the cell requires energy. It is used in various energy-requiring processes of the cell.

So, the correct option is 'ATP'

Multiple choice zoology respiration in organisms active transport and passive transport types of plant transport atp

Energy liberated during respiration is stored as

  1. ATP

  2. ADP

  3. FAD

  4. NADP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cellular respiration requires oxidation of organic substrates for the liberation of energy. The energy released is stored in every living cell in the form of a universal high energy molecule called ATP or adenosine triphosphate.

So the answer is 'ATP'.

Multiple choice zoology respiration in organisms active transport and passive transport types of plant transport atp

ATP is

  1. Adenine triphosphate

  2. Adenosine tetraphosphate

  3. Adenosine triphosphate

  4. Adenine tetraphosphate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Adenosine triphosphate is the long form of ATP, it is the complex organic chemical that participates in many processes. Found in all forms of life, ATP is often referred to as the "molecular unit of currency" of intracellular energy transfer.

So, the correct option is C.

Multiple choice zoology respiration in organisms active transport and passive transport types of plant transport atp

When ATP molecules is hydrolysed in ADP, then the quantity of energy released is about

  1. 120 cal

  2. 1,200 cal

  3. 12,000 cal

  4. 1,20,000 cal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The hydrolysis of ATP to ADP releases approximately 7.3 kcal/mol, which is equivalent to about 7,300 calories. Among the choices, 12,000 calories is the standard approximation used in many textbooks for this biological process.

Multiple choice zoology respiration in organisms active transport and passive transport types of plant transport atp

Common immediate source of energy in cellular activity or energy currency of the cell is

  1. DNA

  2. ATP

  3. RNA

  4. NAD
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The common immediate source of energy in cellular activity is ATP molecule. It is also called as energy currency of the cell. ATP molecules are formed as a result of phosphorylation. It is used in various cellular processes for providing energy.

Multiple choice

What is the primary molecule responsible for energy transfer and metabolism in cells?

  1. Glucose

  2. ATP

  3. NADH

  4. FADH2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

ATP (adenosine triphosphate) is the primary energy currency of cells. It acts as a short-term energy storage molecule, providing energy for various cellular processes.

Multiple choice

Which process in cells is responsible for the breakdown of glucose to produce energy?

  1. Glycolysis

  2. Krebs Cycle

  3. Electron Transport Chain

  4. Oxidative Phosphorylation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glycolysis is the first stage of cellular respiration, where glucose is broken down into pyruvate, releasing energy in the form of ATP and NADH.

Multiple choice

What is the role of the Krebs Cycle in cellular respiration?

  1. Glucose Breakdown

  2. Electron Transport

  3. ATP Production

  4. Pyruvate Oxidation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Krebs Cycle, also known as the Citric Acid Cycle, is a series of chemical reactions that further oxidize pyruvate, derived from glycolysis, to produce NADH, FADH2, and ATP.

Multiple choice

What is the final electron acceptor in the electron transport chain?

  1. Oxygen

  2. Carbon Dioxide

  3. Glucose

  4. Water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxygen is the final electron acceptor in the electron transport chain. It combines with electrons and protons to form water, releasing energy in the form of ATP.

Multiple choice

Which process is responsible for the breakdown of fats to produce energy?

  1. Glycolysis

  2. Krebs Cycle

  3. Beta-Oxidation

  4. Electron Transport Chain
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Beta-oxidation is the process by which fatty acids are broken down into acetyl-CoA molecules, which can then enter the Krebs Cycle for further energy production.

Multiple choice

Which process generates the majority of ATP in cellular respiration?

  1. Glycolysis

  2. Krebs Cycle

  3. Electron Transport Chain

  4. Oxidative Phosphorylation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxidative phosphorylation, which occurs in the electron transport chain, generates the majority of ATP in cellular respiration through the process of chemiosmosis.

Multiple choice

What is the primary role of ATP synthase in cellular respiration?

  1. Glucose Breakdown

  2. Electron Transport

  3. ATP Production

  4. Pyruvate Oxidation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

ATP synthase is an enzyme complex located in the mitochondrial inner membrane. It utilizes the proton gradient generated by the electron transport chain to produce ATP from ADP and inorganic phosphate.