Free Bioenergetics MCQs with Answers
1,378 Bioenergetics 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 explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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- A. Carotenoids, Chlorophyll a, Chlorophyll b
- B. Chlorophyll b, Carotenoids, Chlorophyll a
- C. Carotenoids, chlorophyll b, Chlorophyll a
- D. Chlorophyll a, Chlorophyll b, Carotenoids
Explanation: In the process of photosynthesis, energy transfer occurs in a specific sequence: from accessory pigments to the main photosynthetic…
Correct answer: Carotenoids, chlorophyll b, Chlorophyll a- A. Energized electrons
- B. Uncharged electrons
- C. Energy
- D. All of these
Explanation: NADPH, produced during the light-dependent reactions of photosynthesis, provides high-energy electrons and hydrogen ions to the Calvin…
Correct answer: Energized electrons- A. Carbon dioxide
- B. Oxygen
- C. Carotenoids
- D. Wavelength
Explanation: Photosynthesis is a complex process that converts light energy into chemical energy, producing glucose and oxygen.
Correct answer: Carotenoids- A. Energy consuming
- B. Energy yielding
- C. Net neutralization of energy
- D. Both a and c
Explanation: The oxidation phase of glycolysis is energy-yielding because it results in the production of energy-rich molecules (NADH and ATP) that can…
Correct answer: Energy yielding- A. It is a porphyrin ring or tetrapyrrole ring structure
- B. It is flat, square and light absorbing
- C. Composed of carbon and nitrogen atoms with magnesium as the central metal ion
- D. It is hydrophobic
Explanation: Chlorophyll molecules have a complex structure consisting of the hydrophobic tail region and hydrophilic head region because they need to…
Correct answer: It is hydrophobic- A. Fructose-1,4-phosphate
- B. Fructose-1,6-bisphosphate
- C. Bisphosphate
- D. Fructose
Explanation: Phosphofructokinase (PFK) plays a critical role in glycolysis by catalyzing the conversion of fructose-6-phosphate into…
Correct answer: Fructose-1,6-bisphosphate- A. Day
- B. Night
- C. Dawn and Dusk
- D. Midnight
Explanation: Dusk there is no net gaseous exchange between leaves and atmosphere. At dawn and dusk,when light intensity is low, the rate of…
Correct answer: Dawn and Dusk- A. NADH
- B. DNA
- C. Oxygen
- D. Carbon dioxide
Explanation: Option D is correct because, in the Calvin cycle of photosynthesis, carbon dioxide is reduced to produce carbohydrates (sugars).
Correct answer: Carbon dioxide- A. 40%
- B. 60%
- C. 90%
- D. 100%
Explanation: Option A suggests that the efficiency of respiration, when 100% carbon is oxidized to CO2, is 40%.
Correct answer: 40%- A. Ribosome
- B. Mitochondria
- C. Chloroplast
- D. Golgi bodies
Explanation: Mitochondria are often referred to as the "powerhouses" of the cell because they are the primary sites of cellular respiration.
Correct answer: Mitochondria- A. Convert potential energy to kinetic energy
- B. Convert kinetic energy to potential energy
- C. Convert stored chemical energy into kinetic energy
- D. Convert energy stored in the chemical bonds of glucose to energy that the cell can use
Explanation: Option D:This option accurately describes the primary purpose of cellular respiration.
Correct answer: Convert energy stored in the chemical bonds of glucose to energy that the cell can use- A. 4
- B. 36
- C. 2
- D. 38
Explanation: Anaerobic respiration is a type of respiration that produces energy without using oxygen as the final electron acceptor.In microorganisms…
Correct answer: 2- A. Quality of Light
- B. Intensity of Light
- C. Duration of Light
- D. Temperature
Explanation: The correct answer is Duration of Light. The rate of photosynthesis is primarily affected by the quality and intensity of light, as they…
Correct answer: Duration of Light- A. C55H10O4N6 Mg
- B. C55H70 O6 N4 Mg
- C. C55H71 O6 N4 Mg
- D. C55 H72 O5 N4 Mg
Explanation: Chlorophyll is a green pigment found in plants and other photosynthetic organisms that is responsible for absorbing light energy from the…
Correct answer: C55 H72 O5 N4 Mg- A. 1
- B. 2
- C. 3
- D. 4
Explanation: In the Krebs cycle, also known as the citric acid cycle, one molecule of acetyl-CoA enters the cycle, which is derived from one molecule…
Correct answer: 3- A. Trioses
- B. Pentoses
- C. Tetroses
- D. Hexoses
Explanation: Ribose is a 5-carbon sugar and is a type of pentose sugar. Pentose sugars are important components of nucleic acids such as RNA and DNA.
Correct answer: Pentoses- A. Orange
- B. Red
- C. Blue
- D. Both B and C
Explanation: Plants mainly absorb red and blue light for photosynthesis, with chlorophyll a and b being the primary pigments responsible for this…
Correct answer: Both B and C- A. 600
- B. 650
- C. 680
- D. 700
Explanation: Photosystem I (PS I) is one of the two photosystems involved in the light-dependent reactions of photosynthesis.
Correct answer: 700- A. Ultra-Violet
- B. Blue
- C. Red
- D. None of the above options is correct
Explanation: Option A: Ultraviolet light is a different type of light and can not be seen by the naked eye hence it does not have a colour therefore…
Correct answer: Red- A. NADP
- B. ADP
- C. FADH
- D. RuBP
Explanation: The Calvin cycle reactions fix CO2 from the environment into carbohydrate molecules.
Correct answer: RuBP