Question

what is a structure of a cell​

Answer 1

$\sf\red{Question}\begin{cases}\sf\red{ What \: is \: Structure \: Of \: a \: Cell}\end{cases}$

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⇒ All living cells have the same structural organisation with a few changes in plants and animals cells. The basic structure of a cell includes a cell membrane or plasma membrane, cytoplasm and nucleus.

⇒ Cell membrane or plasma membrane :- It is a thin, elastic membrane surrounding the cell. It protects the cell and it a shape. It is semipermeable, which means it selectively allows the materials to go in and out of the cell. All the material of the cell that is enclosed by the cell membrane is called the protoplasm.

⇒ Cell Wall :- It is present only in plant cells. It is an extra layer present outside the cell membrane. Plants are fixed in one place, have to face unfavourable conditions and do not have any skeleton for support. The cell wall provides rigidity and protection to the plant cells. It is made up of cellulose.

Answer 2

All living things are composed of cells. Cells are the basic units of life and all tissues and organs are composed of cells. They are so small that they must be viewed with a microscope. There are different types of cells. Cells can either be eukaryotic or prokaryotic. Eukaryotic cells have a nucleus and membrane bound organelles. Plant and animal cells are eukaryotes. Plant cells are generally a square shape while animal cells are usually circular. Plant cells and animal cells have evolved different organelles to perform specific functions. Plant cells have chloroplasts, a cell wall and a central vacuole. Animal cells lack these three organelles. Plant cells have chloroplasts because they make their own food. Plant cells have a cell wall so that they do not burst when the central vacuole fills up with water. Prokaryotes do not have a nucleus, and lack membrane bound organelles. They are the oldest cells on earth. Bacteria are prokaryotes. Prokaryotes often move using special structures such as flagella or cilia.

Cells have many structures inside of them called organelles. These organelles are like the organs in a human and they help the cell stay alive. Each organelle has it’s own specific function to help the cell survive. The nucleus of a eukaryotic cell directs the cell’s activities and stores DNA. Eukaryotes also have a golgi apparatus that packages and distributes proteins. Mitochondria are the power house of the cell and provide the cell with energy. Both plant and animal cells have mitochondria. Lysosomes are like the stomach of the cell. They contain enzymes that digest the cell’s used parts. All of the cell’s organelles must work together to keep the cell healthy.

The cell membrane is the protective barrier that surrounds the cell and prevents unwanted material from getting into it. The cell membrane has many functions, but one main function that it has is to transport materials (salts, electrolytes, glucose and other necessary molecules) into the cell to support necessary life functions. Not only does the membrane let molecules into the cell, but it also lets wastes such as carbon dioxide out of the cell. The cell membrane is made up of a phosholipid bilayer. Each phopholipid contains a hydrophilic, or water loving head and ahydrophobic, or water fearing tail. These properties that the phospholipids have and the specific orientation they are arranged in provide the cell with an selectively permeable barrier.