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 not correct of photosynthesis ?

It uses oxygen

It uses water

It occurs during day time

None of these

 Loading...

2. The color of chlorophyll b is  ?

Orange green

Orange red

Yellow and green

Blue and green

 Loading...

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

Glucose

Cell sap

Chlorophyll

Protein

 Loading...

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

20-60

60-80

20-40

20-100

 Loading...

5. Thylakoid membranes are involved in ATP formation by ?

Osmosis

Chemiosmosis

Oxidative phosphorylation

Chemosynthesis

 Loading...

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

Refracted

Reflected

Transmitted

Absorbed

 Loading...

7. Which part of plant captures light energy ?

Mesophyll cell

Choroplast

Stomata

Plastids

 Loading...

8. The pigments found in the thylakoid membranes are ?

All of these

Xanthophyll

Carotenoids

Chlorophyll

 Loading...

9. Process of photosynthesis is almost exactly opposite to ?

Aerobic respiration

Anaerobic repiration

Combustion

Fermentation

 Loading...

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

5 lac

All of above

0.5 million

Half a million

 Loading...

11. What is unrelated to light reactions ?

It can occur in dark

NADPH is produced in it

ATP is produced in it

It can occur in light only

 Loading...

12. Which wavelengths are least absorbed by chlorophyll ?

Blue and red

Violet and yellow

Green and yellow

Orange and indigo

 Loading...

13. 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

D

A

B

C

 Loading...

14. Spectrophotometer is used to measure ?

Absorption of blue light

Absorption of carbon

Absorption of different wavelengths

Absorption of water

 Loading...

15. Chlorophyll contains magnesium in which part ?

Hacme portion

Phytol tail

Porphyrin

Pyrrole ring

 Loading...

16. The products of photosynthetic light reaction are ?

ATP and NADPH

ATP and NAD

ATP and FADPH

ATP and NADH

 Loading...

17. Thylakoid sacs are stacked in columns called ?

Lamellae

Stroma

Grana

Piles

 Loading...

18. 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

 Loading...

19. Which statement about chlorophyll is not true ?

It contains terminal carbonyl group

It contains magnesium

It contains porphyring ring

It contains phytol tail

 Loading...

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

Bioenergetics

THermodynamics

Biochemistry

Biophysics

 Loading...

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

Enteron

Cavity

Coelom

Lumen

 Loading...

22. Oxygen released during photosynthesis comes from ?

Haydrogen

Atmosphere

Carbian dia axcide

soil

 Loading...

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

Man

Photosynthesis

Dark reactions

Respiration

 Loading...

24. Which wavelengths are mainly absorbed by chlorophyll ?

Green and blue

Violet and orange

Red and indigo

Violet blue and orange red

 Loading...

Uncategorized

25. Which process occurs in the absence of oxygen?

Aerobic respiration

Anaerobic respiration

Electron transport chain

Glycolysis

 Loading...

Page 2 of 2

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

Inner mitochondrial membrane

Mitochondrial matrix

Golgi apparatus

Cytoplasm

 Loading...

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

Glycolysis

Electron transport chain

Krebs cycle

Fermentation

 Loading...

28. Cyclic phosphorylation produces:

Glucose

ATP

NADPH

Oxygen

 Loading...

29. Where does the Calvin cycle take place?

Mitochondrial matrix

Stroma of chloroplast

Cytoplasm

Thylakoid membrane

 Loading...

30. Non-cyclic phosphorylation produces:

Oxygen only

ATP and NADPH

Only ATP

Glucose

 Loading...

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

PGAL

RuBP

PGA (3-phosphoglyceric acid)

ATP

 Loading...

32. Which pigment is primarily responsible for absorbing sunlight?

Xanthophyll

Chlorophyll-b

Carotene

Chlorophyll-a

 Loading...

33. Which of the following occurs in the cytoplasm?

Oxidative phosphorylation

Glycolysis

Krebs cycle

Electron transport chain

 Loading...

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

Water

Carbon dioxide

Glucose

Oxygen

 Loading...

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

Ethanol

Pyruvate

Lactic acid

Carbon dioxide

 Loading...

36. The term "oxidative phosphorylation" refers to:

Glucose oxidation

ATP formation during glycolysis

ATP production using energy from electrons and oxygen

Electron transfer without ATP

 Loading...

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

2

8

1

4

 Loading...

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

Oxygen

NAD⁺

Water

Carbon dioxide

 Loading...

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

Inner membrane

Thylakoid membrane

Cytoplasm

Stroma

 Loading...

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

36

6

18

12

 Loading...

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

Glucose

Oxygen

Pyruvate

ATP and NADPH

 Loading...

42. Photosynthesis takes place in:

Mitochondria

Nucleus

Chloroplasts

Ribosomes

 Loading...

43. Chloroplast encloses a dense fluid filled region called ?

Cytosol

Grana

Stroma

Matrix

 Loading...

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

18

32–38

10

24

 Loading...

45. What is the role of water in photosynthesis?

Reduces glucose

Provides electrons and protons

Releases carbon dioxide

Absorbs light

 Loading...

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

One acetyl-CoA

Two carbon dioxide molecules

Two pyruvate molecules

Two lactate molecules

 Loading...

47. What is photolysis?

Absorption of sunlight

Fixation of carbon dioxide

Breakdown of glucose

Splitting of water using light

 Loading...

48. Which gas is released during photosynthesis?

Nitrogen

Carbon dioxide

Methane

Oxygen

 Loading...

49. Which stage of photosynthesis does not require light?

Light-dependent reaction

Calvin cycle

Photophosphorylation

Photolysis

 Loading...

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

Light intensity

Oxygen concentration

CO₂ concentration

Temperature

 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
• >>