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

Process belongs to Glycolysis

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The statement is a placeholder or context-dependent question. Assuming it refers to the general concept of glycolysis, it is true.

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 botany metabolism, cell respiration, and photosynthesis light dependent or hill reaction phases of photosynthesis emerson's experiments & hill's reaction

Light energy is converted into chemical energy through the formation of

  1. $NADPH _2$
  2. $ATP$
  3. $ATP$ and $NADPH _2$

  4. None of the above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
In light-dependent reactions, the energy from sunlight is absorbed by chlorophyll and converted into chemical energy in the form of electron carrier molecules like ATP and NADPH.
Light energy is harnessed in Photosystems I and II, both of which are present in the thylakoid membranes of chloroplasts.
Just as the name implies, light-dependent reactions require sunlight. In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and converted into stored chemical energy, in the form of the electron carrier molecule NADPH (nicotinamide adenine dinucleotide phosphate) and the energy currency molecule ATP (adenosine triphosphate). The light-dependent reactions take place in the thylakoid membranes in the granum (stack of thylakoids), within the chloroplast.