The following points highlight the four main Components of Viruses. The components are: 1. Nucleoid 2. Capsid 3. Envelope 4. Enzymes. Component # 1. Nucleoid: It represents the viral chromosome. Nucleoid or viral chromosome is made of a single molecule of nucleic acid. It may be linear or circular with various degrees of coiling. Nucleoid is the infective part of [...]
The following points highlight the two main types of reproductive cycle in virus. The types are: 1. Lytic Cycle 2. Lysogenic Cycle. Type # 1. Lytic Cycle (Fig. 2.5): It is the reproductive cycle of virulent phages, e.g., T4 bacteriophage. The phage attaches itself to the host cell (e.g., Escherichia coli) through its tail fibres. The fibres bend and bring [...]
The upcoming discussion will update you about the differences between Bacteria and Cyanobacteria. Difference # Bacteria: 1. The cells are comparatively smaller. 2. The cell wall is 1—2 layered. 3. Plasmodesmata and pores do not occur in cell wall. 4. They exhibit lesser structural elaboration. 5. Bacteria are both autotrophic and heterotrophic. 6. Autotrophic bacteria possess bacteriochlorophyll. 7. Photosynthesis is [...]