The cells that form the tissues of animals and plants vary significantly in shape, size and internal structure. However, they all show similarities in the main features of the processes of vital activity, metabolism, irritability, growth, development, and the ability to change.
Cells of all types contain two main components that are closely related to each other – the cytoplasm and the nucleus. The nucleus is separated from the cytoplasm by a porous membrane and contains nuclear juice, chromatin and nucleolus. A semi-liquid cytoplasm fills the entire cell and is penetrated by numerous tubules. Outside, it is covered with a cytoplasmic membrane. It contains specialized organoid structures that are constantly present in the cell, and temporary structures — inclusions. Membrane organelles: cytoplasmic membrane (CM), endoplasmic reticulum (EPS), Golgi apparatus, lysosomes, mitochondria and plastids. The basis of the structure of all membrane organelles is a biological membrane. All membranes have a fundamentally unified structural plan and consist of a double layer of phospholipids in which protein molecules are immersed from different sides at different depths. Membranes of organelles differ from each other only in sets of their constituent proteins.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.