XI Biology Bioenergetics Test Mdcat-2024

Instructions for Chapter Bioenergetics Online Test Mdcat-2024:

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Test Details:

Subject: Biology
Class: 1st year or 11
Chapter name: Bioenergetics
Test: MDCAT 2024
Book: Sindh Textbook
Total No. Of MCQS: 50
Time Allowed: 50 Minutes
Price : Free

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Created on May 22, 2024 By

medicoengineer.com

XI Biology Bioenergetics Online Test Mdcat-2024

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NameEmailPhone Number

1 / 50

1. The CAM process is followed by ___ plants, which is an alternative to the C3 cycle to tackle photorespiration.

a) Succulent plants

b) Sporophyte plants

c) Agricultural plants

d) C4 plants

e) Angiosperm plants

2 / 50

2. RuBP oxidation in photorespiration passing sequence is?

a) Peroxisome → Mesosome → Thylakoid membrane

b) Peroxisome → Mitochondria → Cytoplasm

c) Chloroplast → Peroxisome → Mitochondria

d) Mitochondria → Peroxisome → Thylakoid membrane

3 / 50

3. During the hydrolysis of fats, glycerol is produced. Later, it is converted into?

a) 3PGA

b) PGAL

c) DHAP

d) Phosphoglycerate

4 / 50

4. Which of the following is the end product of anaerobic respiration?

a) Methyl alcohol

b) Acetaldehyde

c) Formaldehyde

d) Carbohydrate

e) Ethyl alcohol

5 / 50

5. Choose the incorrect statement.

a) 9 NADPH are used during the Calvin cycle for one triose

b) 2 ATP are formed as substrate-level phosphorylation during complete oxidation of photosynthesis

c) Low levels of ATP trigger cyclic phosphorylation

d) Net ATP gain in eukaryotic cells for oxidation of one glucose is 36 ATP

6 / 50

6. Phosphoenolpyruvate is used in some plants instead of Rubisco. Which are these plants?

a) C3 plants

b) CAM plants

c) Enol plants

d) C4 plants

7 / 50

7. Photosystem I and II both contain chlorophyll A but their absorption spectra differ due to?

a) Chlorophyll structure differences

b) Chlorophyll-bound proteins

c) Linear excitation of electrons

d) Chlorophyll change in location

e) They do not contain chlorophyll

8 / 50

8. The isotope used during the validation of Von Neils' hypothesis is?

a) O₁₆

b) O₁₇

c) O₁₈

d) O₁₇ and H₂

9 / 50

9. Which of the following are not found in the reaction center of the photosystem?

a) Chlorophyll B

b) Xanthophylls

c) Carotenoids

d) All of these

10 / 50

10. How many carbon dioxides form during one Krebs cycle?

a) 2 CO2

b) 3 CO2

c) 4 CO2

d) 5 CO2

11 / 50

11. The synthesis of ATP during the electron transport chain in the presence of oxygen is called?

a) Photorespiration

b) Oxidative photorespiration

c) Glycolysis

d) Photophosphorylation

e) Oxidative phosphorylation

12 / 50

12. Choose the incorrect statement.

a) In photorespiration, light energy is used for the formation of ATP

b) An acid glycolate formation takes place by oxidation of RuBP during photorespiration

c) One pyruvate can run one Krebs cycle

d) Coenzyme A attaches to acetyl in the matrix of mitochondria

e) Bundle sheaths in the C4 cycle do the C3 cycle

13 / 50

13. Choose the incorrect statement.

a) Phytol chain is made of hydrocarbons

b) Citric acid is a tricarboxylic acid

c) The reaction center of the photosystem only consists of chlorophyll A

d) Lactic acid fermentation net gain is 2 NADPH

e) Glycolysis in the oxidation phase forms 4 ATP and 2 NADH

14 / 50

14. Which of the following combinations is required for chemiosmosis?

a) Proton pump, electron gradient, NADP synthase

b) Membrane, proton pump, proton gradient, ATP synthase

c) Membrane, proton pump, proton gradient, NADP synthase

d) Proton pump, electron gradient, ATP synthase

15 / 50

15. The relative effectiveness of absorption of chlorophyll A is?

a) Red

b) Violet-red

c) Blue-red

d) Violet-orange

16 / 50

16. The relative effectiveness of different wavelengths (colors) of light in driving photosynthesis is called?

a) Absorption spectrum

b) Action spectrum

c) Spectrometry

d) Photospectrometry

17 / 50

17. The first stable product of the C3 cycle is?

a) 2-carbon radical

b) 3-carbon radical

c) 4-carbon radical

d) 6-carbon radical

18 / 50

18. During which conversion does decarboxylation occur in the Krebs cycle?

a) Malate to oxaloacetate

b) Succinate to fumarate

c) Succinyl CoA to succinate

d) Isocitrate to alpha-ketoglutarate

19 / 50

19. Formation of ATP during the Krebs cycle is formed during the conversion of?

a) Malate to oxaloacetate

b) Succinate to fumarate

c) Succinyl CoA to succinate

d) Isocitrate to alpha-ketoglutarate

e) Succinate to succinyl CoA

20 / 50

20. In which process does decarboxylation not occur?

a) Malate to oxaloacetate

b) Pyruvate to lactic acid

c) Photolysis of water

d) Fumarate to malate

e) All of these

21 / 50

21. During glycolysis, glucose is phosphorylated into?

a) Fructose 6-phosphate

b) Fructose 1,6-bisphosphate

c) Glucose 6-phosphate

d) Glucose 5-phosphate

e) DHAP

22 / 50

22. The triose phosphate, when entering the cytosol via a phosphorus translocator, is turned into a sugar called?

a) Hexose

b) Glucose

c) Sucrose

d) Glycine

e) Starch

23 / 50

23. In which cycle is the 4-carbon compound directly converted into a 6-carbon compound?

a) Glycolysis

b) Krebs cycle

c) Alcohol fermentation

d) Lactic acid fermentation

e) All of these

24 / 50

24. ATP formed during glycolysis is an example of?

a) Photorespiration

b) Photophosphorylation

c) Substrate-level phosphorylation

d) Oxidative phosphorylation

25 / 50

25. In CAM plants, the stomata close during?

a) Daytime

b) Nighttime

c) Dusk time

d) Dawn time

26 / 50

26. In C4 cycles, the carbon fixation is done by?

a) RuBP

b) Rubisco

c) PEP

d) Enol

27 / 50

27. Downstream electron correct sequence in ETC is:

a) Plastocyanin > PqA > PqB > PqC > PqA3

b) Coenzyme A > PqB > PqC > PqA > PqA3

c) Cytochrome b/f > PqB > PqC > PqA > PqA3

d) Coenzyme Q > PqB > PqC > PqA > PqA3

28 / 50

28. The last acceptor of electrons in the ETC is?

a) Plastoquinone

b) Plastocyanin

c) Oxygen

d) Cytochrome b/f

29 / 50

29. The first phase of cellular respiration is?

a) Chemiosmosis

b) Glycolysis

c) Lactic acid fermentation

d) Krebs cycle

e) Electron transport chain

30 / 50

30. Oxidation of one pyruvic acid gives how many acetyl-CoA, CO2, and NADH2 respectively?

a) Acetyl-CoA: 1, CO2: 2, NADH2: 3

b) Acetyl-CoA: 1, CO2: 4, NADH2: 5

c) Acetyl-CoA: 2, CO2: 2, NADH2: 2

d) Acetyl-CoA: 1, CO2: 1, NADH2: 1

31 / 50

31. In which phase of the Krebs cycle is NADH formed?

a) Oxaloacetate to citric acid

b) Alpha-ketoglutarate to succinyl CoA

c) Succinyl CoA to succinate

d) Fumarate to malate

e) Isocitrate to oxaloacetate

32 / 50

32. The full name of RuBP is?

a) Ribulose 1,3-bisphosphate

b) Ribulose 1,4-bisphosphate

c) Ribulose 1,5-bisphosphate

d) Ribulose 1,6-bisphosphate

33 / 50

33. A single NADPH2 requires how many electrons and protons to reduce?

a) 1 electron and 1 proton

b) 2 electrons and 2 protons

c) 3 electrons and 2 protons

d) 5 electrons and 2 protons

34 / 50

34. The water-splitting complex is composed of?

a) Manganese clusters

b) Z-complex

c) ATPase complex

d) A and B

35 / 50

35. Movement of H+ through the ATPase complex due to the concentration gradient is called?

a) Electrochemical gradient

b) Chemiosmosis

c) Cyclic phosphorylation

d) Electron transport chain

36 / 50

36. Choose the correct sequence during photorespiration:

a) RuBP → glycolate → serine → glycine

b) Glucose → glycolate → serine → glycine

c) RuBP → glycolate → glycine → serine

d) Glucose → glycolate → glycine → serine

37 / 50

37. Action spectrum and absorption spectra are not parallel due to?

a) Chlorophyll A and B

b) Chlorobium

c) Accessory pigments

d) All of these

38 / 50

38. The cyclic photophosphorylation is triggered by?

a) Low ATP and low NADPH2

b) Low ATP and high NADPH2

c) High ATP and high NADPH2

d) High ATP and low NADPH2High ATP and low NADPH2

39 / 50

39. How many hydrogen ions are required for the synthesis of ATP in chemiosmosis?

a) 2 H+

b) 3 H+

c) 4 H+

d) 5 H+

40 / 50

40. Chlorophyll is embedded into the hydrophobic core of the thylakoid membrane via?

a) Porphyrin ring

b) Pyrrole ring

c) Phytol chain

d) All of these

41 / 50

41. Glycolate is how many carbon radical?

a) Two-carbon radical

b) Three-carbon radical

c) Four-carbon radical

d) Five-carbon radical

42 / 50

42. Conversion of pyruvate into lactic acid by lactic acid fermentation is via an enzyme called?

a) Lactic hydrogenase

b) Lactic dehydrogenase

c) Lactic oxidoreductase

d) Lactic carboxylase

43 / 50

43. Chlorophyll B has a different functional group compared to chlorophyll A, which is:

a) Methyl group

b) Methane group

c) Aldehyde group

d) C₂₀H₃₉

44 / 50

44. The action spectrum peaks are ___ and valleys are ___.

a) Broader and deep

b) Broader and narrow

c) Narrow and deep

d) Deep and narrow

45 / 50

45. The molecular formula of chlorophyll B is:

a) C₅₅H₇₂O₆N₄Mg

b) C₅₅H₇₀O₆N₄Mg

c) C₅₅H₇₂O₅N₄Mg

d) C₅₅H₇₀O₅N₄Mg

46 / 50

46. Which of the following is not a part of photosynthesis?

a) Krebs cycle

b) Dark reaction

c) Chemiosmosis in the thylakoid membrane

d) C3 cycle

47 / 50

47. In the reduction phase of the Calvin cycle, how many NADPH2 and how many ATP are used?

a) 6 ATP and 6 NADPH2

b) 6 ATP and 9 NADPH2

c) 9 ATP and 6 NADPH2

d) No ATP and NADPH2 used

48 / 50

48. Ferredoxin is an/a:

a) Iron containing protein

b) Iron-magnesium containing protein

c) copper-containing protein

d) Magnesium-sulfur containing protein

49 / 50

49. In the Calvin-Benson cycle, a short intermediate is formed after carboxylation of RuBP. How many carbons does this radical have?

a) 2 carbons

b) 4 carbons

c) 3 carbons

d) 6 carbons

50 / 50

50. Which of the following releases hydrogen ions into the lumen when two electrons pass downstream into it?

a) Plastoquinone

b) Plastocyanin

c) Ferredoxin

d) Iron-sulfur proteins

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