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

The glycolysis ultimately results in the formation of

  1. Ethanol

  2. Acetyl-CoA

  3. Pyruvic acid

  4. CO2 & H2O
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Two pyruvic acid molecules are the end product of glycolysis per mono- saccharide molecule. So,pyruvic acid is the ultimate product of glycolysis.

Multiple choice

Inside the cell the energy is stored in the form of

  1. ATP

  2. Acetyl-CoA

  3. CO2

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

When there is respiration through the aerobic process, Glucose together with Oxygen produces Energy, Carbon Dioxide and Water.A lot of energy is produced during aerobic respiration, which may be as high as 38 ATP molecules for every glucose molecule. This means that the cell stores energy in form of ATP.

Multiple choice

In which of the following parts are ATP and NADPH produced?

  1. Stroma

  2. Chloroplast envelope

  3. Intermembrane space

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

Light reactions occur mostly in the thylakoid stacks of the grana. Here, sunlight is converted to chemical energy in the form of ATP (free energy containing molecule) and NADPH (high energy electron carrying molecule).

Multiple choice

Which of the following is functional unit of enzyme?

  1. Co enzyme

  2. Active site

  3. Holoenzyme

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

The functional unit of enzymes is called 'Holoenzyme'. This is made up of 'apoenzyme' which is a protein part and a non protein part called prosthetic group. The prosthetic group which is covalently attached with the enzyme is known as cofactor.

Multiple choice

Glutamate up-take into glial cells

  1. is a dead-end pathway

  2. is by passive diffusion

  3. ends in its metabolism into glutamine by glutaminase

  4. ends in its metabolism into glutamine by glutamine synthase

  5. ends in its metabolism into GABA by glutamic acid decarboxylase

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

Glutamine synthase is a glial enzyme that metabolizes glutamate into glutamine. Because glutamine is relatively small and uncharged, it can diffuse across the glial and neuronal membranes and once in the neurons glutaminase converts glutamine into glutamate trapping it in the neuron, it can then be packaged into vesicles for release.

Multiple choice

Uric acid is the end product of the

  1. Protein metabolism

  2. Purine metabolism

  3. CHO metabolism

  4. Fat metabolism

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

Uric acid is the final oxidation product of purine metabolism in humans. High levels can lead to conditions like gout.

Multiple choice

Gluconeogenesis is

  1. formation of glucose from sources other than carbohydrate

  2. formation of glycogen

  3. breakdown of glucose

  4. formation of ammonia from glucose
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Gluconeogenesis is formation of glucose from sources other than carbohydrate.

Multiple choice

Urea formation takes place through :

  1. Nitrogen cycle

  2. Ornithine cycle

  3. Cori cycle

  4. Krebs' cycle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Urea is formed in liver through ornithine cycle. The liver cells continuously release urea into the blood. Now, kidneys withdraw it from the blood to excrete in urine.