nitrogen-fixation-and-photosynthesis biotechnology question and answers -Page first

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Nitrogen Fixation and Photosynthesis problems

1. Which of the following aid plants in the acquisition of nitrogen from nitrogen gas of the atmosphere?
Options
A. Bacteria
B. Algae
C. Nematodes
D. Moulds

Correct Answer: Bacteria

2. A major plant macronutrient found in nucleic acids and proteins is
Options
A. calcium
B. nitrogen
C. sulphur
D. iron

Correct Answer: nitrogen

3. In the Calvin cycle of C3 plants, which molecule is the acceptor of CO₂?
Options
A. Erythrose-4-phosphate
B. Ribulose-l,5-diphosphate
C. Ribose-5-phosphate
D. Alpha-ketoglutarate

Correct Answer: Ribulose-l,5-diphosphate

4. What is the metal ligand in chlorophylls?
Options
A. Copper (Cu)
B. Iron (Fe)
C. Magnesium (Mg)
D. Manganese (Mn)

Correct Answer: Magnesium (Mg)

5. Which of the following molecule is produced from the fixation of CO₂ in C4 plants?
Options
A. Malate
B. Oxaloacetate
C. Pyruvate
D. Alpha-ketoglutarate

Correct Answer: Oxaloacetate

6. During nitrogen fixation the enzyme nitrogenase catalyse the reaction. The reaction is high energy demanding which require approximately
Options
A. 12 ATP
B. 18 ATP
C. 25 ATP
D. 7 ATP

Correct Answer: 18 ATP

7. Which of the following bacteria genus is capable of oxidizing ammonia (NH₄)?
Options
A. Nitrospina
B. Nitrobacter
C. Nitrosococcus
D. Nitrosobacter

Correct Answer: Nitrosococcus

8. Chlorophyll is associated with
Options
A. thylakoids
B. stroma
C. cristae
D. matrix

Correct Answer: thylakoids

9. Organisms capable of converting N₂ to NO₃ are
Options
A. yeasts
B. bacteria
C. roundworms
D. moulds

Correct Answer: bacteria

10. The chief source of nitrogen for green plants is
Options
A. atmospheric nitrogen
B. nitrates
C. ammonium salts
D. low molecular weight- organic nitrogenous compound

Correct Answer: nitrates

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