Question

Prokaryotes used in making curd and antibiotics are

Answer 1

Curd and antibiotics production

• Curd is prepared from milk by Lactobacillus. It ferments the milk and produces lactic acid, which reduces the pH of milk to form curd.
• Antibiotics are secondary metabolites produced by some bacteria such as Streptomyces. They are used as medicine.

Heterotrophic bacteria

• Heterotrophic bacteria utilises organic carbon sources to produce energy. They do not synthesise their own food but depend on these organic molecules (also known as substrate) for their food.
• Lactobacillus and Streptomyces are heterotrophs that utilise simple sugars such as lactose and glucose as their carbon source respectively.