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

Please wait...

 0%

Page 1 of 2

Medical Subject

1. What is unrelated to light reactions ?

NADPH is produced in it

It can occur in light only

It can occur in dark

ATP is produced in it

 Loading...

2. The color of chlorophyll b is  ?

Orange green

Blue and green

Orange red

Yellow and green

 Loading...

3. Chlorophyll contains magnesium in which part ?

Porphyrin

Hacme portion

Phytol tail

Pyrrole ring

 Loading...

4. The products of photosynthetic light reaction are ?

ATP and NAD

ATP and FADPH

ATP and NADPH

ATP and NADH

 Loading...

5. Process of photosynthesis is almost exactly opposite to ?

Anaerobic repiration

Fermentation

Combustion

Aerobic respiration

 Loading...

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

Cavity

Enteron

Coelom

Lumen

 Loading...

7. Thylakoid sacs are stacked in columns called ?

Lamellae

Piles

Stroma

Grana

 Loading...

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

Transmitted

Refracted

Reflected

Absorbed

 Loading...

9. Which wavelengths are least absorbed by chlorophyll ?

Blue and red

Orange and indigo

Violet and yellow

Green and yellow

 Loading...

10. Which part of plant captures light energy ?

Stomata

Plastids

Choroplast

Mesophyll cell

 Loading...

11. Oxygen released during photosynthesis comes from ?

soil

Atmosphere

Carbian dia axcide

Haydrogen

 Loading...

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

20-100

20-40

60-80

20-60

 Loading...

13. What is not correct of photosynthesis ?

It occurs during day time

It uses oxygen

None of these

It uses water

 Loading...

14. Which statement about chlorophyll is not true ?

It contains terminal carbonyl group

It contains phytol tail

It contains magnesium

It contains porphyring ring

 Loading...

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

Biochemistry

Biophysics

THermodynamics

Bioenergetics

 Loading...

16. Which wavelengths are mainly absorbed by chlorophyll ?

Violet blue and orange red

Violet and orange

Green and blue

Red and indigo

 Loading...

17. Thylakoid membranes are involved in ATP formation by ?

Chemosynthesis

Osmosis

Oxidative phosphorylation

Chemiosmosis

 Loading...

18. The pigments found in the thylakoid membranes are ?

Chlorophyll

Xanthophyll

Carotenoids

All of these

 Loading...

19. Spectrophotometer is used to measure ?

Absorption of blue light

Absorption of carbon

Absorption of different wavelengths

Absorption of water

 Loading...

20. 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

A

C

D

 Loading...

21. 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

B

A

 Loading...

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

Half a million

0.5 million

All of above

5 lac

 Loading...

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

Chlorophyll

Cell sap

Protein

Glucose

 Loading...

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

Dark reactions

Man

Photosynthesis

Respiration

 Loading...

Uncategorized

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

Carbon dioxide

Lactic acid

Pyruvate

Ethanol

 Loading...

Page 2 of 2

26. Which stage of photosynthesis does not require light?

Light-dependent reaction

Photolysis

Calvin cycle

Photophosphorylation

 Loading...

27. Cyclic phosphorylation produces:

Oxygen

NADPH

Glucose

ATP

 Loading...

28. Which gas is released during photosynthesis?

Methane

Carbon dioxide

Oxygen

Nitrogen

 Loading...

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

Inner mitochondrial membrane

Mitochondrial matrix

Cytoplasm

Golgi apparatus

 Loading...

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

12

6

18

36

 Loading...

31. Which of the following occurs in the cytoplasm?

Krebs cycle

Electron transport chain

Glycolysis

Oxidative phosphorylation

 Loading...

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

CO₂ concentration

Light intensity

Oxygen concentration

Temperature

 Loading...

33. Photosynthesis takes place in:

Nucleus

Ribosomes

Chloroplasts

Mitochondria

 Loading...

34. Non-cyclic phosphorylation produces:

Only ATP

Glucose

Oxygen only

ATP and NADPH

 Loading...

35. Where does the Calvin cycle take place?

Thylakoid membrane

Mitochondrial matrix

Cytoplasm

Stroma of chloroplast

 Loading...

36. What is the role of water in photosynthesis?

Reduces glucose

Releases carbon dioxide

Absorbs light

Provides electrons and protons

 Loading...

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

One acetyl-CoA

Two pyruvate molecules

Two lactate molecules

Two carbon dioxide molecules

 Loading...

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

Carbon dioxide

Oxygen

Water

NAD⁺

 Loading...

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

18

24

32–38

10

 Loading...

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

2

1

8

4

 Loading...

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

Thylakoid membrane

Inner membrane

Cytoplasm

Stroma

 Loading...

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

PGA (3-phosphoglyceric acid)

ATP

PGAL

RuBP

 Loading...

43. The term "oxidative phosphorylation" refers to:

ATP formation during glycolysis

Glucose oxidation

ATP production using energy from electrons and oxygen

Electron transfer without ATP

 Loading...

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

Oxygen

Glucose

Carbon dioxide

Water

 Loading...

45. Which pigment is primarily responsible for absorbing sunlight?

Xanthophyll

Chlorophyll-a

Carotene

Chlorophyll-b

 Loading...

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

Oxygen

ATP and NADPH

Pyruvate

Glucose

 Loading...

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

Krebs cycle

Fermentation

Electron transport chain

Glycolysis

 Loading...

48. What is photolysis?

Breakdown of glucose

Splitting of water using light

Fixation of carbon dioxide

Absorption of sunlight

 Loading...

49. Chloroplast encloses a dense fluid filled region called ?

Cytosol

Matrix

Stroma

Grana

 Loading...

50. Which process occurs in the absence of oxygen?

Glycolysis

Electron transport chain

Aerobic respiration

Anaerobic respiration

 Loading...

 Loading...

• <<
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• >>