Question

Soil Ecology

• How is nutrient uptake different between Gram +ve and Gram –ve bacteria?
• Which features of the cell wall of each limit and regulate what gets in?
• Which type of imbalanced medium, or nutrient deficiency, has the most severe effect on bacteria survival?
• How is the immobilized bacteria biomass turned over?
• What are the main grazers of bacteria?
• What happens to the soil if all the nematodes are removed from the field?
• Which bacteria metabolic pathways are active at +200 mv Eh?
• Under anaerobic conditions, which S redox reactions are possible?
• Under what conditions does sulfur becomes limiting in the soil?
• Although nematodes can be destructive to crop production, most of the time, their infection is limited in scope. What are the reasons that is?

Answer 1

1. Answer: Nutrient uptake difference between Gram positive and negative bacteria. Gram positive bacteria have thick peptidoglycan layer whereas gram negative bacteria have thin peptidoglycan. So nutrient uptake efficiency for the gram positive bacteria will be less than the gram negative bacteria. Gram positive bacteria also does not have periplasmic space and there will be no binding proteins for easy uptake of nutrient from the surroundings.