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

The presence of arginase confirms that

  1. urea cycle is operating

  2. urea cycle may be operating

  3. arginine is converted into citrulline

  4. arginine is converted into ornithine

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reaction catalysed by arginase enzyme is: Arginine + H2O → Ornithine + Urea. It is the final enzyme of the urea cycle.

Multiple choice

The most abundant, harmful and universal waste product of metabolism is

  1. CO2

  2. H2O

  3. Uric acid

  4. None of the above

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dangerous consequences of rising levels of carbon dioxide in the Earth's atmosphere are well-documented, from destructive weather events and deadly health effects to its harmful impact on oceans, species migration, agriculture and national security.

Multiple choice

Which of the following accepts terminal electron?

  1. Molecular oxygen

  2. Molecular water

  3. Molecular CO2

  4. NADPH2

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Oxygen is the terminal electron acceptor in photosynthesis. In oxygenic photosynthesis, the first electron donor is water that creates oxygen as a waste product.

Multiple choice

Which of the following connects glycolysis to Kreb's cycle?

  1. Acetyl CoA

  2. Ribozyme

  3. Cytochrome oxidase

  4. N-acetyl glucosamine

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pyruvate is the end product of glycolysis. It is converted to acetyl CoA by pyruvate dehydrogenase complex into acetyl CoA. This finally enters into Kreb's cycle.