MDCAT 2025 Biology Bioenergetics Test Online Mcqs

MDCAT Biology Bioenergetics Test

Practice Bioenergetics MCQs for MDCAT 2025 Biology, based on the official PMDC syllabus. Cover key topics like photosynthesis, respiration, and ATP with this chapter-wise online test to boost your concept clarity and exam readiness.

Biology Bioenergetics Online Test

Biology Bioenergetics Online Test Question with Answer

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Medical Subject

1. The products of photosynthetic light reaction are ?

ATP and NADPH

ATP and NAD

ATP and NADH

ATP and FADPH

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2. Thylakoid membranes are involved in ATP formation by ?

Osmosis

Chemosynthesis

Chemiosmosis

Oxidative phosphorylation

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3. Thylakoid sacs are stacked in columns called ?

Grana

Piles

Stroma

Lamellae

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4. What is not correct of photosynthesis ?

It occurs during day time

It uses oxygen

It uses water

None of these

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5. The interior of thylakoid apace is also called a ?

Cavity

Enteron

Coelom

Lumen

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6. Loght can work in photosynthesis only if it is ?

Reflected

Refracted

Absorbed

Transmitted

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7. What is unrelated to light reactions ?

It can occur in light only

ATP is produced in it

NADPH is produced in it

It can occur in dark

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8. Chlorophyll contains magnesium in which part ?

Porphyrin

Hacme portion

Pyrrole ring

Phytol tail

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9. Which part of plant captures light energy ?

Plastids

Stomata

Choroplast

Mesophyll cell

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10. The presence of free oxygen made possible the evolution of ?

Man

Dark reactions

Photosynthesis

Respiration

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11. Which equation of photosynthesis is correct one ?

A=6CO 2 + 12H 2 O + Light→C ₆ H ₁₂ O ₆ + 6O ₂ + 6H ₂ O
B=6CO ₂ + 6H ₂ O + Light→C ₆ H ₁₂ O ₆ + 6O _{2
C=Both of these}

A

B

C

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12. Spectrophotometer is used to measure ?

Absorption of different wavelengths

Absorption of carbon

Absorption of water

Absorption of blue light

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13. The number of chloroplastis in a square millimeter of leaf surface is about ?

Half a million

5 lac

0.5 million

All of above

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14. Process of photosynthesis is almost exactly opposite to ?

Combustion

Aerobic respiration

Fermentation

Anaerobic repiration

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15. Oxygen released during photosynthesis comes from ?

Carbian dia axcide

Haydrogen

Atmosphere

soil

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16. The pigments found in the thylakoid membranes are ?

Chlorophyll

Carotenoids

Xanthophyll

All of these

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17. The number of chlorroplasts in each mesophyll cell ranges from ?

20-40

20-60

60-80

20-100

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18. Which statement about chlorophyll is not true ?

It contains magnesium

It contains terminal carbonyl group

It contains phytol tail

It contains porphyring ring

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19. Magnesium is an important nutrient ion in green plants as it is an essential component of ?

Protein

Cell sap

Chlorophyll

Glucose

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20. The color of chlorophyll b is  ?

Blue and green

Orange green

Orange red

Yellow and green

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21. Which wavelengths are mainly absorbed by chlorophyll ?

Violet and orange

Green and blue

Red and indigo

Violet blue and orange red

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22. Which statement about photosynthesis is not correct ?

A=CO ₂ and H ₂ O are used
B=Take place in light and dark
C=Light energy absorbed by chlorophy
D=Occurs in almost all the green parts of Plant

C

A

B

D

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23. The principles of energy transformations in living systems is called ?

THermodynamics

Biochemistry

Bioenergetics

Biophysics

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24. Which wavelengths are least absorbed by chlorophyll ?

Violet and yellow

Orange and indigo

Green and yellow

Blue and red

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Uncategorized

25. The light-dependent reactions of photosynthesis occur in:

Inner membrane

Thylakoid membrane

Cytoplasm

Stroma

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26. Chloroplast encloses a dense fluid filled region called ?

Stroma

Matrix

Cytosol

Grana

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27. The net gain of ATP molecules in glycolysis is:

4

2

8

1

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28. Which stage of photosynthesis does not require light?

Calvin cycle

Photolysis

Photophosphorylation

Light-dependent reaction

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29. What is photolysis?

Splitting of water using light

Breakdown of glucose

Fixation of carbon dioxide

Absorption of sunlight

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30. Which molecule is the final electron acceptor in aerobic respiration?

Oxygen

NAD⁺

Carbon dioxide

Water

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31. What is the primary product of the light-dependent reaction?

ATP and NADPH

Pyruvate

Glucose

Oxygen

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32. Cyclic phosphorylation produces:

NADPH

ATP

Glucose

Oxygen

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33. What is the main site of the electron transport chain?

Inner mitochondrial membrane

Golgi apparatus

Cytoplasm

Mitochondrial matrix

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34. Which pigment is primarily responsible for absorbing sunlight?

Chlorophyll-b

Chlorophyll-a

Xanthophyll

Carotene

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35. Where does the Calvin cycle take place?

Mitochondrial matrix

Thylakoid membrane

Stroma of chloroplast

Cytoplasm

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36. Which factor does not directly affect the rate of photosynthesis?

CO₂ concentration

Light intensity

Oxygen concentration

Temperature

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37. Which of the following is produced during anaerobic respiration in muscles?

Lactic acid

Pyruvate

Carbon dioxide

Ethanol

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38. Non-cyclic phosphorylation produces:

Glucose

Oxygen only

Only ATP

ATP and NADPH

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39. Which gas is released during photosynthesis?

Nitrogen

Carbon dioxide

Oxygen

Methane

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40. Which process occurs in the absence of oxygen?

Glycolysis

Aerobic respiration

Anaerobic respiration

Electron transport chain

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41. What is the role of water in photosynthesis?

Provides electrons and protons

Absorbs light

Releases carbon dioxide

Reduces glucose

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42. How many ATP molecules are produced from one glucose molecule in aerobic respiration?

10

24

32–38

18

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43. The term "oxidative phosphorylation" refers to:

Glucose oxidation

Electron transfer without ATP

ATP production using energy from electrons and oxygen

ATP formation during glycolysis

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44. How many ATP molecules are used in the Calvin cycle to form one glucose?

6

36

18

12

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45. In the Calvin cycle, which molecule is fixed to form sugars?

Oxygen

Carbon dioxide

Glucose

Water

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46. The first stable compound in the Calvin cycle is:

PGAL

PGA (3-phosphoglyceric acid)

RuBP

ATP

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47. Which process produces the most ATP in cellular respiration?

Glycolysis

Fermentation

Krebs cycle

Electron transport chain

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48. Photosynthesis takes place in:

Nucleus

Chloroplasts

Mitochondria

Ribosomes

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49. In glycolysis, one glucose molecule is broken down into:

Two lactate molecules

Two carbon dioxide molecules

Two pyruvate molecules

One acetyl-CoA

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50. Which of the following occurs in the cytoplasm?

Glycolysis

Electron transport chain

Oxidative phosphorylation

Krebs cycle

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