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. Chlorophyll contains magnesium in which part ?

Porphyrin

Hacme portion

Phytol tail

Pyrrole ring

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2. 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

B

A

D

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

60-80

20-40

20-60

20-100

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

Biochemistry

THermodynamics

Biophysics

Bioenergetics

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

Chlorophyll

Glucose

Cell sap

Protein

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6. Which wavelengths are least absorbed by chlorophyll ?

Orange and indigo

Violet and yellow

Green and yellow

Blue and red

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7. The products of photosynthetic light reaction are ?

ATP and NADH

ATP and NAD

ATP and NADPH

ATP and FADPH

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8. Which part of plant captures light energy ?

Plastids

Mesophyll cell

Choroplast

Stomata

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9. The pigments found in the thylakoid membranes are ?

All of these

Chlorophyll

Xanthophyll

Carotenoids

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10. What is not correct of photosynthesis ?

None of these

It occurs during day time

It uses oxygen

It uses water

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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}

B

A

C

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12. Process of photosynthesis is almost exactly opposite to ?

Combustion

Fermentation

Anaerobic repiration

Aerobic respiration

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13. Which wavelengths are mainly absorbed by chlorophyll ?

Red and indigo

Violet blue and orange red

Green and blue

Violet and orange

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

0.5 million

5 lac

All of above

Half a million

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

Coelom

Enteron

Lumen

Cavity

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16. The color of chlorophyll b is  ?

Orange green

Orange red

Yellow and green

Blue and green

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17. Which statement about chlorophyll is not true ?

It contains porphyring ring

It contains terminal carbonyl group

It contains magnesium

It contains phytol tail

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18. Oxygen released during photosynthesis comes from ?

Haydrogen

Atmosphere

soil

Carbian dia axcide

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19. What is unrelated to light reactions ?

It can occur in light only

ATP is produced in it

It can occur in dark

NADPH is produced in it

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20. Thylakoid membranes are involved in ATP formation by ?

Oxidative phosphorylation

Chemiosmosis

Osmosis

Chemosynthesis

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21. Spectrophotometer is used to measure ?

Absorption of carbon

Absorption of water

Absorption of blue light

Absorption of different wavelengths

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

Dark reactions

Photosynthesis

Respiration

Man

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23. Thylakoid sacs are stacked in columns called ?

Grana

Stroma

Lamellae

Piles

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

Absorbed

Refracted

Transmitted

Reflected

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Uncategorized

25. Which process occurs in the absence of oxygen?

Anaerobic respiration

Glycolysis

Electron transport chain

Aerobic respiration

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26. Where does the Calvin cycle take place?

Stroma of chloroplast

Cytoplasm

Mitochondrial matrix

Thylakoid membrane

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27. Chloroplast encloses a dense fluid filled region called ?

Matrix

Stroma

Cytosol

Grana

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

Water

Oxygen

NAD⁺

Carbon dioxide

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29. Cyclic phosphorylation produces:

Glucose

NADPH

Oxygen

ATP

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

8

1

4

2

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

18

6

12

36

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32. Which of the following occurs in the cytoplasm?

Oxidative phosphorylation

Krebs cycle

Electron transport chain

Glycolysis

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

Inner mitochondrial membrane

Cytoplasm

Mitochondrial matrix

Golgi apparatus

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34. What is the role of water in photosynthesis?

Releases carbon dioxide

Provides electrons and protons

Absorbs light

Reduces glucose

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35. Photosynthesis takes place in:

Nucleus

Chloroplasts

Mitochondria

Ribosomes

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

Inner membrane

Cytoplasm

Stroma

Thylakoid membrane

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

Pyruvate

Ethanol

Lactic acid

Carbon dioxide

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

Oxygen concentration

Temperature

Light intensity

CO₂ concentration

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

ATP

RuBP

PGA (3-phosphoglyceric acid)

PGAL

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40. Which gas is released during photosynthesis?

Carbon dioxide

Oxygen

Nitrogen

Methane

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41. Non-cyclic phosphorylation produces:

Oxygen only

Only ATP

ATP and NADPH

Glucose

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

10

32–38

18

24

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

Carbon dioxide

Water

Glucose

Oxygen

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44. The term "oxidative phosphorylation" refers to:

Glucose oxidation

ATP production using energy from electrons and oxygen

Electron transfer without ATP

ATP formation during glycolysis

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45. Which pigment is primarily responsible for absorbing sunlight?

Chlorophyll-b

Carotene

Chlorophyll-a

Xanthophyll

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

One acetyl-CoA

Two lactate molecules

Two carbon dioxide molecules

Two pyruvate molecules

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47. What is photolysis?

Fixation of carbon dioxide

Absorption of sunlight

Splitting of water using light

Breakdown of glucose

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48. Which stage of photosynthesis does not require light?

Photophosphorylation

Calvin cycle

Photolysis

Light-dependent reaction

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

Fermentation

Glycolysis

Krebs cycle

Electron transport chain

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

Oxygen

Glucose

Pyruvate

ATP and NADPH

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