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| 1. What is the structure of a cell and what are its functions? |  |
Ans. A cell is the basic unit of life and has a specific structure. It consists of various components such as the cell membrane, cytoplasm, and nucleus. The cell membrane acts as a protective barrier, allowing certain substances to enter and exit the cell. The cytoplasm is a jelly-like substance that fills the cell and contains organelles that perform specific functions. The nucleus is the control center of the cell, containing genetic material. Overall, the structure of a cell enables it to carry out essential functions such as metabolism, growth, and reproduction.
| 2. What are the functions of the cell membrane? | |
Ans. The cell membrane has several important functions. Firstly, it acts as a boundary, separating the cell's internal environment from the external environment. It also controls the movement of substances in and out of the cell, allowing nutrients to enter and waste products to exit. Additionally, the cell membrane plays a role in cell communication, as it contains receptors that can receive signals from other cells or the environment. Moreover, it helps maintain the cell's shape and structure by providing support and protection.
| 3. What is the role of the cytoplasm in a cell? | |
Ans. The cytoplasm is a gel-like substance that fills the cell and plays a crucial role in various cellular processes. It acts as a site for metabolic reactions, where enzymes break down nutrients and produce energy. Additionally, the cytoplasm houses various organelles, such as mitochondria and ribosomes, which are involved in protein synthesis and energy production. It also serves as a medium for the transport of molecules within the cell. Overall, the cytoplasm provides a supportive environment for cellular activities to take place.
| 4. What is the function of the nucleus in a cell? | |
Ans. The nucleus is the control center of the cell and has several essential functions. One of its primary roles is to store and protect the cell's genetic material, which is in the form of DNA. The nucleus also regulates gene expression, controlling the synthesis of proteins necessary for various cellular functions. It plays a crucial role in cell division, as it directs the replication of DNA and the formation of new cells. Additionally, the nucleus is involved in the assembly of ribosomes, which are responsible for protein synthesis.
| 5. How do cells carry out the process of reproduction? | |
Ans. Cells can reproduce through two main processes: mitosis and meiosis. Mitosis is the process by which cells divide to produce two identical daughter cells. It is involved in growth, repair, and asexual reproduction. During mitosis, the cell's DNA is replicated, and the chromosomes are evenly distributed to the daughter cells. On the other hand, meiosis is a specialized form of cell division that occurs in reproductive cells. It involves two rounds of division, resulting in the production of four genetically diverse daughter cells. Meiosis is essential for sexual reproduction and the formation of gametes (sperm and eggs).
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