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

What is true for Glycolysis

  1. Occurs in Cytoplasm

  2. Only process in Respiration in Anaerobic organisms

  3. Glucose undergoes partial oxidation to form 2 molecules of PA

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

Glycolysis occurs in the cytoplasm, is the sole pathway for ATP production in anaerobic organisms, and involves the partial oxidation of glucose into two molecules of pyruvic acid.

Multiple choice

Glycolysis scheme was given by

  1. Embden

  2. Meyerhoff

  3. Parnas

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

The glycolysis pathway is commonly referred to as the EMP pathway, named after the three scientists Gustav Embden, Otto Meyerhof, and Jakub Parnas.

Multiple choice

Glycolysis is breakdown of Glucose to

  1. Pyruvic acid

  2. Acetyl CO A

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glycolysis is defined as the metabolic pathway that breaks down one molecule of glucose into two molecules of pyruvic acid.

Multiple choice

Energy Currency of the cell

  1. ATP

  2. NADH

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

ATP (Adenosine Triphosphate) is universally recognized as the primary energy currency of the cell because it provides readily available energy for biological work.

Multiple choice

State the full form of ATP

  1. Adenosine triphosphate.

  2. Adenosine di phosphate

  3. Adenosine Tetra Phosphate

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

ATP stands for Adenosine Triphosphate, which is the primary energy carrier in cells.

Multiple choice

Cells require all but which of the following for metabolism

  1. energy source

  2. carbon source

  3. electron source

  4. nitrogen source

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

While nitrogen is essential for life, it is not strictly required for basic metabolism in the same way that energy, carbon, and electron sources are. Some organisms can fix nitrogen, but the core metabolic processes rely on the other three.

Multiple choice

What do mitochondria produce?

  1. Rx

  2. CPR

  3. ATP

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

Mitochondria are known as the powerhouses of the cell because they generate most of the cell's supply of adenosine triphosphate (ATP) through oxidative phosphorylation.

Multiple choice

How many ATP molecules does fermentation make?

  1. 6 ATP

  2. 4 ATP

  3. 2 ATP

  4. 36 ATP
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fermentation is an inefficient process that only produces a net gain of 2 ATP molecules per glucose molecule, which are generated during the glycolysis stage.

Multiple choice

Yeast is used in the production of which of the following?

  1. Wine

  2. Alcohol

  3. Fermentation

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yeast is a fungus used in the fermentation process to produce alcohol and carbon dioxide, which is essential for making wine and bread. Since all listed items relate to this process, 'All of these' is the correct choice.