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. Oxygen released during photosynthesis comes from ?

Carbian dia axcide

soil

Atmosphere

Haydrogen

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2. Which wavelengths are mainly absorbed by chlorophyll ?

Violet and orange

Green and blue

Violet blue and orange red

Red and indigo

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3. The color of chlorophyll b is  ?

Orange red

Blue and green

Orange green

Yellow and green

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4. Which statement about chlorophyll is not true ?

It contains terminal carbonyl group

It contains phytol tail

It contains porphyring ring

It contains magnesium

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5. 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

B

D

A

C

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

Cavity

Coelom

Lumen

Enteron

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7. Which part of plant captures light energy ?

Mesophyll cell

Choroplast

Plastids

Stomata

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8. Thylakoid membranes are involved in ATP formation by ?

Chemiosmosis

Chemosynthesis

Osmosis

Oxidative phosphorylation

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9. What is unrelated to light reactions ?

It can occur in dark

ATP is produced in it

It can occur in light only

NADPH is produced in it

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10. Thylakoid sacs are stacked in columns called ?

Stroma

Lamellae

Piles

Grana

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11. Spectrophotometer is used to measure ?

Absorption of different wavelengths

Absorption of blue light

Absorption of carbon

Absorption of water

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12. Process of photosynthesis is almost exactly opposite to ?

Fermentation

Combustion

Aerobic respiration

Anaerobic repiration

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13. The products of photosynthetic light reaction are ?

ATP and FADPH

ATP and NADPH

ATP and NAD

ATP and NADH

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14. Which wavelengths are least absorbed by chlorophyll ?

Orange and indigo

Green and yellow

Blue and red

Violet and yellow

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15. 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}

C

A

B

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

THermodynamics

Biophysics

Bioenergetics

Biochemistry

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17. Chlorophyll contains magnesium in which part ?

Hacme portion

Phytol tail

Pyrrole ring

Porphyrin

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

Respiration

Dark reactions

Photosynthesis

Man

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

20-60

60-80

20-40

20-100

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20. What is not correct of photosynthesis ?

None of these

It uses water

It occurs during day time

It uses oxygen

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21. The pigments found in the thylakoid membranes are ?

Carotenoids

Xanthophyll

Chlorophyll

All of these

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

Transmitted

Reflected

Refracted

Absorbed

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

Glucose

Chlorophyll

Protein

Cell sap

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

0.5 million

Half a million

5 lac

All of above

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Uncategorized

25. Which gas is released during photosynthesis?

Nitrogen

Oxygen

Methane

Carbon dioxide

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26. What is photolysis?

Breakdown of glucose

Absorption of sunlight

Fixation of carbon dioxide

Splitting of water using light

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

Water

Carbon dioxide

Oxygen

Glucose

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

Fermentation

Glycolysis

Electron transport chain

Krebs cycle

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29. Photosynthesis takes place in:

Ribosomes

Chloroplasts

Nucleus

Mitochondria

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30. Which process occurs in the absence of oxygen?

Aerobic respiration

Anaerobic respiration

Electron transport chain

Glycolysis

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

Two pyruvate molecules

Two carbon dioxide molecules

One acetyl-CoA

Two lactate molecules

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32. Chloroplast encloses a dense fluid filled region called ?

Cytosol

Grana

Matrix

Stroma

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

CO₂ concentration

Temperature

Light intensity

Oxygen concentration

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34. Where does the Calvin cycle take place?

Cytoplasm

Mitochondrial matrix

Stroma of chloroplast

Thylakoid membrane

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

Mitochondrial matrix

Golgi apparatus

Inner mitochondrial membrane

Cytoplasm

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

Pyruvate

ATP and NADPH

Glucose

Oxygen

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37. Which pigment is primarily responsible for absorbing sunlight?

Xanthophyll

Carotene

Chlorophyll-a

Chlorophyll-b

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38. Non-cyclic phosphorylation produces:

Only ATP

Oxygen only

ATP and NADPH

Glucose

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

NAD⁺

Oxygen

Water

Carbon dioxide

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

Stroma

Inner membrane

Thylakoid membrane

Cytoplasm

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41. Which stage of photosynthesis does not require light?

Photophosphorylation

Light-dependent reaction

Calvin cycle

Photolysis

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42. Which of the following occurs in the cytoplasm?

Glycolysis

Krebs cycle

Electron transport chain

Oxidative phosphorylation

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

1

4

2

8

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

Carbon dioxide

Ethanol

Lactic acid

Pyruvate

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

PGAL

ATP

RuBP

PGA (3-phosphoglyceric acid)

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

12

18

6

36

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47. Cyclic phosphorylation produces:

ATP

Oxygen

Glucose

NADPH

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48. What is the role of water in photosynthesis?

Reduces glucose

Provides electrons and protons

Releases carbon dioxide

Absorbs light

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49. The term "oxidative phosphorylation" refers to:

ATP formation during glycolysis

Glucose oxidation

ATP production using energy from electrons and oxygen

Electron transfer without ATP

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

18

24

10

32–38

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