All Free Biology MCQs with Answers

4081. During aerobic respiration, glucose is oxidized to carbon dioxide and water and:

• A. Energy is consumed
• B. Light is consumed
• C. Energy is released
• D. Light is produced

Explanation: During aerobic respiration glucose is broken down in the presence of oxygen into carbon dioxide and water and energy is produced. See the explanation of Q No. 9.

4082. Cristae are part of:

• A. Chloroplast
• B. Endoplasmic reticulum
• C. Mitochondrion
• D. Golgi apparatus

Explanation: Each mitochondrion is constructed of an outer enclosing membrane and an inner membrane with elaborate folds or cristae that extend into the interior of the organelle.

4083. A large "battery" of _ slowly release energy from the glucose molecules.

• A. Organelles
• B. Coenzymes
• C. Enzymes
• D. Enzyme and coenzymes

Explanation: Aerobic respiration being a long pathway involves many enzymes and coenzymes.

4084. A compound found in every living cell and is one of the essential chemicals of life. It plays a key role in most biological energy transformations. It is:

• A. NADH
• B. FADH
• C. ATP
• D. Glucose

Explanation: That is why it is called energy currency of the cell.

4085. Conventionally, 'P' stands for the:

• A. Phosphorus atom
• B. Entire phosphate group
• C. Phosphorus element
• D. Phosphorus acid

Explanation: Conventionally, "P" stands for the entire phosphate group. The second and third phosphate represent the so called "high energy" bonds. If these are broken by hydrolysis far more free energy is released as compared to the other bond in the ATP molecule.

4086. A far more free energy is released when bond of _ phosphate of ATP is broken by hydrolysis.

• A. First
• B. Third
• C. Second
• D. Second and third

Explanation: The second and third phosphate represent the so called "high energy" bonds.

4087. What enables the cell to accumulate a great quantity of energy in very small space and keeps it ready for use as soon as it is needed?

• A. High energy 'P' bond
• B. High energy bonds of organic food
• C. High energy bonds of glucose
• D. High energy bonds of lipids

Explanation: The energy of organic food is extracted from its bonds through aerobic respiration and is called ATP (in high energy 'p' bond).

4088. Cellular respiration is also called as:

• A. Internal respiration
• B. Biological oxidation
• C. Organismic respiration
• D. Internal respiration and biological oxidation

Explanation: Based on the explanations provided, the correct answer to the question is option D) Internal respiration and biological oxidation.

4089. The breakdown of glucose in cell yields pyruvate in the:

• A. Presence of oxygen
• B. Absence of oxygen
• C. Presence or absence of oxygen
• D. High Conc. of oxygen

Explanation: Based on the explanations provided, the correct answer to the question is option C) Presence or absence of oxygen.

4090. Following are the requirements for glycolysis to occur in the cytoplasm EXCEPT:

• A. Glucose
• B. ATP
• C. Enzymes and Coenzymes
• D. FAD

Explanation: Based on the explanations provided, the correct answer to the question is option D) FAD.