Q1. Answer the following:
- a) "Bacteria have a major impact on human life by their beneficial activities". Elaborate with examples. (200 words)
- b) Discuss the lysogenic cycle with a neat diagram. (200 words)
- Nitrogen-fixing bacteria (e.g., Rhizobium) convert atmospheric nitrogen into usable forms, enhancing soil fertility.
- Lactobacillus species are crucial for food fermentation, producing dairy products like yogurt and cheese.
- Streptomyces bacteria are sources of many important antibiotics, used in medicine.
- The human gut microbiome, composed of beneficial bacteria, aids digestion, synthesizes vitamins, and supports immune function.
Answer: Bacteria, despite their reputation for causing diseases, are indispensable to human life through a myriad of beneficial activities across various sectors. These microscopic organisms play crucial roles in maintaining ecological balance, supporting industrial processes, and contributing directly to human health. Simultaneously, viruses, specifically bacteriophages, exhibit distinct replication strategies like the lysogenic cycle. This cycle allows the viral genome to integrate into the host bact...