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 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

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

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

Enzymes concerned with transfer of electrons are

  1. hydrolysases

  2. dehydrogenases

  3. transaminases

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

A dehydrogenase (also called DH or DHase in the literature) is an enzyme belonging to the group of oxidoreductases that oxidizes a substrate by a reduction reaction that removes one or more hydrogens from a substrate to an electron acceptor, usually NAD+/NADP+ or a flavin coenzyme such as FAD or FMN.

Multiple choice

Which of the following enzymes is related with electron transfer?

  1. Hydrolase

  2. Dehydrogenase

  3. Desmolase

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

A dehydrogenase (also called DH or DHase in the literature) is an enzyme belonging to the group of oxidoreductases that oxidizes a substrate by a reduction reaction that removes one or more hydrogens from a substrate to an electron acceptor, usually NAD+/NADP+ or a flavin coenzyme such as FAD or FMN.

Multiple choice

Glycolysis is a part of

  1. anaerobic respiration

  2. aerobic respiration

  3. both aerobic and anaerobic respiration

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

Glycolysis is the first step in the breakdown of glucose. It occurs both in aerobic and anaerobic respiration.

Multiple choice

In human beings, the anaerobic respiration produces

  1. lactic acid

  2. glucose

  3. amino acid

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

Lactic acid is a compound produced when glucose is broken-down and oxidized. During intense exercise, when oxygen levels are lower, more lactic acid is produced.