Roughly how many kilocalories of energy are released when the terminal phosphate bond of ATP is broken?
Correct answer B. 7.3
Topic / 54 questions
Bioenergetics MCQs
Bioenergetics MCQs are multiple-choice questions on how living organisms capture, store and use energy, mainly through photosynthesis and cellular respiration. They are designed for MDCAT, NEET UG and MBBS admission test candidates studying first-year biology. Each question shows its correct answer instantly, so you can check details about chlorophyll, ATP and glycolysis quickly.
- Biological Molecules 74
- Coordination and Control 72
- Biology Diagnostic 70
- Cell Structure and Function 67
- Biotechnology 65
- Reproduction 58
- Bioenergetics 55
- Circulation 50
- Inheritance 48
- Digestion 45
- Immunity 45
- Support and Movement 45
- Acellular Life (Viruses) 45
- Homeostasis 45
- Respiration and Gaseous Exchange 45
- Evolution 45
- Enzymes 45
- Cell Cycle 41
- Chromosome and DNA 40
- Biology Introduction 38
- Ecosystem 27
During which process are ATP molecules consumed?
Correct answer B. Glycolysis
What kind of process is cellular respiration, essentially?
Correct answer C. Oxidation
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What is the final electron acceptor in the respiratory (electron transport) chain?
Correct answer A. Oxygen
The chlorophyll molecule sits in the core of the thylakoid membrane. What is the nature of this core region?
Correct answer A. Hydrophobic
During alcoholic fermentation, pyruvic acid is ultimately converted into which product?
Correct answer A. Ethyl alcohol
A shortage of which element causes plant leaves to turn yellow?
Correct answer A. Magnesium
Which wavelengths of light do chlorophylls mainly absorb?
Correct answer A. Orange – red
What colour are xanthophyll pigments?
Correct answer C. Yellow
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In which membranes of the chloroplast are chlorophyll molecules embedded?
Correct answer B. Thylakoid
At what wavelength do the reaction-centre molecules of Photosystem II absorb light most strongly?
Correct answer A. 680 nm
Into what are the thylakoids in chloroplasts stacked?
Correct answer A. Grana
What does NADPH2 provide?
Correct answer D. All of these
Where do the light reactions of photosynthesis take place?
Correct answer B. Grana
Which substance is reduced in photosynthesis?
Correct answer A. CO2
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What proportion of the leaf surface do stomata cover?
Correct answer B. 1-2 %
What share of total photosynthesis is carried out by land plants?
Correct answer C. 10%
Which colour of light causes the greatest food production in green plants?
Correct answer D. Red
Which organism was used to obtain the first action spectrum?
Correct answer B. Spirogyra
Who obtained the first action spectrum?
Correct answer B. T. W. Engelmann
About Bioenergetics MCQs
Photosynthesis dominates this category. Questions cover the molecular formulas of chlorophyll a and b, the structure of the chlorophyll head, the order in which accessory pigments pass energy to the main pigment, the colours of light plants absorb most, leaves as the main sites of photosynthesis and the small share of leaf surface covered by stomata. Questions on times when there is no net gas exchange test the idea of the compensation point.
Respiration and ATP form the second strand. Items ask where glycolysis takes place, in which reactions ATP is consumed and how energy flows from light reactions to the Calvin cycle. These are standard topics in the bioenergetics chapter of Pakistani and Indian intermediate biology, and medical entry tests often check exact formulas and locations, so careful repetition is very helpful.
Key facts to remember
- The molecular formula of chlorophyll a is C55H72O5N4Mg.
- The molecular formula of chlorophyll b is C55H70O6N4Mg.
- Glycolysis takes place in the cytoplasm of the cell.
- ATP is consumed during the Calvin cycle of photosynthesis.
- Plants absorb mainly red and blue light for photosynthesis and reflect most green light.
Exams that include Bioenergetics MCQs
Pakistan
- MDCAT
- NTS
- ETEA
- Educators/teaching tests (SST, EST)
India
- NEET UG
- CUET
- State TETs
Bangladesh
- Medical admission test (MBBS)
- University admission tests (DU, RU, JU)
- NTRCA
How to prepare for Bioenergetics MCQs
- Write the chlorophyll a and b formulas side by side and note the difference, CH3 in a versus CHO in b.
- Learn the location of each stage of respiration and photosynthesis, as 'where does this occur' questions appear often.
- Draw a simple flow of energy from accessory pigments to the reaction centre of chlorophyll a to remember the order.
- Revise the compensation point, when photosynthesis equals respiration, which explains questions about no net gas exchange at dawn and dusk.
Frequently asked questions
What is bioenergetics in biology?
Bioenergetics is the study of energy flow and transformation in living organisms. It mainly covers photosynthesis, where light energy is converted into chemical energy in glucose, and cellular respiration, where that chemical energy is released and stored as ATP for use in cell activities.
How many Bioenergetics MCQs are on MCQs360?
MCQs360 has 55 Bioenergetics MCQs in its MCAT Biology section, each with an instant answer. Practice is free and needs no sign-up, so you can revise this chapter alongside other biology topics before your entry test.
Which exams include Bioenergetics MCQs?
Bioenergetics is part of the biology syllabus for MDCAT and ETEA medical tests in Pakistan, NEET UG in India and the MBBS admission test in Bangladesh. It also appears in science teacher recruitment tests and university admission tests that include biology.
Where do glycolysis and the Krebs cycle take place?
Glycolysis takes place in the cytoplasm, where one glucose molecule is broken into two pyruvate molecules with a small net gain of ATP. The Krebs cycle takes place in the matrix of the mitochondria, where acetyl CoA is oxidised and carriers such as NADH are produced for the electron transport chain.
Last reviewed October 2026