Free Cellular Respiration MCQs with Answers
182 Cellular Respiration MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
Last updated
182 questions · page 9 of 10
- A. Chemical process
- B. Biochemical process
- C. Mechanical process
- D. Both B and C
Explanation: Respiration is a biochemical process, in which the cells of an organism obtain energy by reacting oxygen with glucose, resulting in the…
Correct answer: Biochemical process- A. 4.5
- B. 5.5
- C. 7.5
- D. 6.7
Explanation: Because in anaerobic reaction only glycolysis takes placse in which glucose is given 2 ATP and then at the end pyruvate is formed with 4…
Correct answer: 5.5163. One of the most important molecule found in living organisms is ATP. What is its major function?
- A. Energy source of the cell
- B. Coenzyme
- C. Cofactor
- D. Both Options A and B are correct
Explanation: ATP (adenosine triphosphate) is a molecule that serves as the primary energy source for most cellular processes.
Correct answer: Both Options A and B are correct- A. Glycolysis.
- B. ETC.
- C. Krebs cycle.
- D. Calvin cycle.
Explanation: Krebs cycle (or citric acid cycle) breaks down the pyruvic acid to carbon dioxide.
Correct answer: Krebs cycle.- A. Alcoholic fermentation.
- B. Lactic acid fermentation.
- C. Glycolysis.
- D. Pyruvic acid oxidation.
Explanation: The product of this reaction is lactic acid. This builds up in muscles causing pain and tiredness, which can lead to cramp.
Correct answer: Lactic acid fermentation.- A. Fructose-6-phosphate
- B. Glucose-1-phosphate
- C. Fructose-1, 6-bisphosphate
- D. Glucose-6-phosphate
Explanation: Explanation:When glucose enters the Cytoplasm, the first reaction of Glycolysis is addition of a phosphate molecule into the glucose…
Correct answer: Glucose-6-phosphate- A. It is released asgas
- B. lt forms CO2
- C. It is reduced to water
- D. It is used as an electron carier
Explanation: In the electron transport chain (ETC) of cellular respiration, oxygen (O_2) serves as the final electron acceptor.
Correct answer: It is reduced to water- A. ADP
- B. PGAL
- C. DPGA
- D. NAD
Explanation: Option D is correct because NAD (Nicotinamide adenine dinucleotide) functions as a hydrogen carrier in glycolysis.
Correct answer: NAD- A. Cyt "O"
- B. Cyt "a3"
- C. Cyt "b"
- D. Cyt "c"
Explanation: A membrane-bound cytochrome f-b complex participates in both respiratory and photosynthetic elevtron transport.
Correct answer: Cyt "b"- A. Glucose phosphate → fructose diphosphate
- B. Fructose diphosphate → DAP
- C. PGAL→ PGAP
- D. PGAP→ PGA
Explanation: Energy transfer here occurs by the transfer of phosphate group from one compound to another.
Correct answer: Fructose diphosphate → DAP- A. Glycosidic
- B. Peptide
- C. Ester
- D. None
Explanation: Covalent bond formed between the 1st carbon atom of one monosaccharide with 4 carbon atoms of the neighboring monosaccharide unit is known…
Correct answer: Glycosidic- A. It is reduced to water
- B. It is converted to gas
- C. It is used as an electron carrier
- D. It supplies energy to produce ATP
Explanation: Oxygen plays a crucial role in the electron transport chain as the final electron acceptor.
Correct answer: It is reduced to water- A. Four ATPs
- B. Two ATPs
- C. One ATP
- D. Three ATPs
Explanation: Three ATPs: This is the correct option. Each NADH molecule generally leads to the synthesis of around three ATP molecules in the electron…
Correct answer: Three ATPs- A. photosynthesis
- B. digestion
- C. respiration
- D. circulation
Explanation: Respiration: Respiration is the biochemical process by which cells break down organic molecules, such as glucose, and convert them into…
Correct answer: respiration- A. 2 ATP
- B. 3 ATP
- C. 4 ATP
- D. 32 ATP
Explanation: Glycolysis is the process of breaking down one molecule of glucose into two molecules of pyruvate.
Correct answer: 2 ATP- A. Glycolysis
- B. Lipogenesis
- C. Ketogenesis
- D. Glycogenesis
Explanation: The correct answer is lipogenesis, which refers to the conversion of excess glucose into fat.
Correct answer: Lipogenesis- A. One ATP
- B. Two ATP
- C. 32 ATP
- D. 36 ATP
Explanation: The Krebs cycle, also known as the citric acid cycle, occurs in the mitochondria and is a critical part of cellular respiration.
Correct answer: One ATP- A. Respiration
- B. Photosynthesis
- C. Growth
- D. Both A and B
Explanation: Redox reactions are crucial in both respiration and photosynthesis. In respiration, glucose is oxidized to produce energy, and oxygen is…
Correct answer: Both A and B- A. Electron transport chain
- B. Photophosphorylation
- C. Krebs cycle
- D. Glycolysis
Explanation: The correct answer is A, the electron transport chain, which occurs on the cristae of the mitochondria.
Correct answer: Electron transport chain180. 6-NADH can yield:
- A. 12-ATP
- B. 38-ATP
- C. 18-ATP
- D. 36-ATP
Explanation: An NADH molecule on oxidation theoretically releases sufficient energy to make 3 ATP molecules.
Correct answer: 18-ATP