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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Read the Bioenergetics notesFree MDCAT chapter notes with key terms1,378 questions · page 49 of 69
- A. 5
- B. 4
- C. 6
- D. 3
Explanation: Ribulose phosphate specifically refers to ribulose-1,5-bisphosphate (RuBP), a 5-carbon sugar phosphate.
Correct answer: 5- A. Oxygen
- B. Electrons
- C. ATP
- D. NADPH
Explanation: In cyclic photophosphorylation, electrons move cyclically through the electron transport chain of the thylakoid membrane.
Correct answer: Electrons- A. Outer membrane of the chloroplast
- B. Inner membrane of the chloroplast
- C. Stroma of the chloroplast
- D. Thylakoid membranes of the chloroplast
Explanation: The correct answer is the thylakoid membranes of the chloroplast. Light-dependent reactions take place here, where chlorophyll and other…
Correct answer: Thylakoid membranes of the chloroplast- A. Formation of ATP
- B. Release of oxygen
- C. Release of hydrogen
- D. Synthesis of PGAL
Explanation: The dark reactions, also known as the Calvin Cycle or light-independent reactions, involve the synthesis of PGAL from carbon dioxide and…
Correct answer: Synthesis of PGAL- A. Photophosphorylation
- B. Photolysis
- C. Chemiosmosis
- D. All of these
Explanation: During the light-dependent reactions of photosynthesis, ATP is synthesized through a process called chemiosmosis.
Correct answer: Chemiosmosis- A. 700 nm
- B. 600 nm
- C. 750 nm
- D. 770 nm
Explanation: Photosystem I, also known as P700, is optimized to absorb light at a wavelength of 700 nanometers.
Correct answer: 700 nm- A. Stroma
- B. Grana
- C. Thylakoid membrane
- D. Intergrana
Explanation: The thylakoid membranes are the sites within chloroplasts where chlorophyll pigments are embedded.
Correct answer: Thylakoid membrane- A. Chlorophyll a
- B. Chlorophyll c
- C. Chlorophyll b
- D. None of these
Explanation: Chlorophyll a,b,c,d and e are not present in bacteriochlorophyll.
Correct answer: None of these- A. Hydrophilic
- B. Hydrophobic
- C. Both of these
- D. None of these
Explanation: The part of the chlorophyll molecule that is embedded in the core of the thylakoid membrane is the hydrophobic tail which consists of a…
Correct answer: Hydrophobic- A. Orange
- B. Red
- C. Green
- D. Both A and B
Explanation: The correct answer is red light, which is highly absorbed by chlorophyll in plants and plays a vital role in photosynthesis, especially in…
Correct answer: Red- A. Water
- B. Hydrogen sulphide
- C. Hydrogen cyanide
- D. Hydrogen potassium permanganate
Explanation: Under anoxic conditions certain microorganisms utilized the energy of hydrogen sulfide to power their cellular process.
Correct answer: Hydrogen sulphide- A. Chlorophyll a
- B. Chlorophyll b
- C. Carotenoids
- D. All of these
Explanation: The correct answer is Chlorophyll a because it is a water-insoluble pigment that plays a central role in photosynthesis by capturing light…
Correct answer: Chlorophyll a- A. Seaweeds
- B. Mushrooms
- C. Purple sulphur bacteria
- D. Angiosperms
Explanation: Mushrooms, being fungi, do not have chlorophyll and therefore cannot perform photosynthesis.
Correct answer: Mushrooms- A. Green plants
- B. Green algae
- C. Animals
- D. Both A and B
Explanation: Option D is correct because both green plants and green algae contain chlorophyll b, which enables them to carry out photosynthesis.
Correct answer: Both A and B- A. NO2
- B. C6H12O6
- C. H2O
- D. H2SO4
Explanation: The correct answer is C6H12O6, which is an organic compound known as glucose.
Correct answer: C6H12O6- A. Sclerenchymatous cells
- B. Parenchyma cells
- C. Chlorenchyma cells
- D. Both B and C
Explanation: Chlorenchyma cells are specialized plant cells that contain chloroplasts, making them the primary site for photosynthesis.
Correct answer: Chlorenchyma cells- A. Oxidation only
- B. Reduction only
- C. Both oxidation and reduction
- D. None of these
Explanation: Photosynthesis is a complex redox process encompassing both oxidation and reduction reactions.
Correct answer: Both oxidation and reduction- A. Organic
- B. Energy poor
- C. Energy rich
- D. Reduced
Explanation: The reactants (CO2 and H2O) for the reaction do not consist of energy. The photosynthesis reaction takes energy from sunlight, hence this…
Correct answer: Energy poor- A. Actin spectrum
- B. Action spectrum
- C. Absorption spectrum
- D. Emission spectrum
Explanation: The action spectrum is the graph that shows the over all rate of photosynthesis at each wavelength of light.
Correct answer: Action spectrum- A. Fe2+
- B. Zn2+
- C. Cu2+
- D. Mg2+
Explanation: Chlorophyll is a pigment essential for photosynthesis, and its structure includes a magnesium (Mg2+) ion at the center of a porphyrin…
Correct answer: Mg2+