Explain the reproduction of:

Here are the answers to your biology assignment: 6. Explain the reproduction of: Amoeba: Amoeba primarily reproduces asexually through binary fission*. In this process, the single-celled amoeba first duplicates its genetic material. Then, the nucleus divides, followed by the cytoplasm, resulting in two identical daughter amoebae. Yeast: Yeast, a single-celled fungus, primarily reproduces asexually through budding*. A small outgrowth, or bud, forms on the parent cell. The nucleus of the parent cell divides, and one of the daughter nuclei moves into the bud. The bud then grows and eventually detaches from the parent cell, forming a new, independent yeast cell. 7. Differentiate between viruses and bacteria under the following headings: | Feature | Viruses | Bacteria | | :----------- | :------------------------------------------ | :-------------------------------------------- | | Structure | Acellular; genetic material (DNA or RNA) enclosed in a protein capsid. Some have an outer envelope. | Prokaryotic cells; possess a cell wall, cell membrane, cytoplasm, ribosomes, and nucleoid. | | Reproduction | Replicate only inside living host cells, using the host's machinery. | Reproduce asexually by binary fission (cell division). | | Nutrition | No metabolism; rely entirely on host cell for nutrients and energy. | Diverse nutritional modes: autotrophic (photosynthetic, chemosynthetic) or heterotrophic (saprophytic, parasitic). | | Size | Extremely small (20-400 nm), visible only with an electron microscope. | Larger than viruses (0.2-10 µm), visible with a light microscope. | 8. List five diseases caused by each of the following: Viruses: Influenza* (Flu) Measles* HIV/AIDS* Chickenpox* Common Cold* Bacteria: Tuberculosis* Cholera* Typhoid Fever* Tetanus* Pneumonia* Fungi: Ringworm* Athlete's Foot* Candidiasis* (Thrush) Histoplasmosis* Aspergillosis* Protozoa: Malaria* Amoebic Dysentery* Giardiasis* Sleeping Sickness* (Trypanosomiasis) Leishmaniasis* 9. Explain the role of microorganisms in the nitrogen cycle. Microorganisms play crucial roles in the nitrogen cycle, transforming nitrogen between various forms essential for life. Nitrogen Fixation: Certain bacteria (e.g., Rhizobium in legume root nodules, Azotobacter* in soil) convert atmospheric nitrogen gas (N_2) into ammonia (NH_3), which plants can absorb. Nitrification: Nitrifying bacteria (e.g., Nitrosomonas, Nitrobacter*) convert ammonia into nitrites (NO_2^-) and then into nitrates (NO_3^-), which are readily usable by plants. Ammonification: Decomposers (bacteria and fungi) break down organic nitrogen from dead organisms and waste products into ammonia. Denitrification: Denitrifying bacteria (e.g., Pseudomonas*) convert nitrates back into nitrogen gas, releasing it into the atmosphere and completing the cycle. 10. Describe the life cycle of a virus and explain how viruses reproduce inside a host cell. The life cycle of a virus, also known as viral replication, involves several key steps that occur inside a host cell: Attachment (Adsorption): The virus binds to specific receptor sites on the surface of a susceptible host cell. Entry (Penetration): The virus or its genetic material enters the host cell. This can occur through various mechanisms, such as direct injection of genetic material, endocytosis (engulfment by the cell), or fusion of the viral envelope with the host cell membrane. Uncoating: Once inside, the viral capsid is removed, releasing the genetic material (DNA or RNA) into the host cell's cytoplasm. Replication/Biosynthesis: The viral genetic material takes over the host cell's machinery to synthesize viral components. This involves replicating the viral genome and transcribing/translating viral genes into viral proteins (e.g., capsid proteins, enzymes). Assembly (Maturation): Newly synthesized viral genomes and proteins are assembled into new, complete virus particles (virions). Release: The new virions are released from the host cell. This can happen through lysis (bursting) of the host cell, or by budding, where the virions acquire an envelope from the host cell membrane as they exit. The released virions can then infect new host cells, continuing the cycle. 3 done, 2 left today. You're making progress.