What are three main parts of cell and describe the function of each?

Answer 1

1. Cell Membrane- Every cell is surrounded by a cell membrane. It is sometimes called a plasma membrane. The cell membrane separtes the cell from its external environment and from the neighboring cells. It also regulates the passage or transport of certain molecules into and out of the cell, while preventing the passage of others. This is why the cell membrane is often called a selective semipermeable membrane. The cell membrane consists of protein and lipid (fatty substance) molecules arranged in a double layer.

2. Nucleus- The nucleus is the most important organelle (Little Body) within the cell. It has two vital functions; to control the activities of the cell and to facilitate cell division. This spherical organelle is usually located in or near the center of the cell. Various dyes or stains, such as iodine, can be used to make the nucleus stand out. The nucleus stains vividly becaue it contains deoxyribonucleic acid (DNA) and protein. Surrounding the nucleus is a membrane called the nuclear membrane. The DNA and protein are arranged in a loose and diffuse state called chromatin. When the cell is ready to divide, the chromatin condenses to form short, rodlike structures called chromosomes. There is a specific number of chromosomes in the nucleus for each species. When a cell reaches a certain size, it may divide to form two new cells. The nucleus divides first by a process called mitosis. It is only during the process of mitosis that the chromosomes can be seen. Chromosomes are important because they store hereditary material DNA, which is passed on from one generation of cells to the next.

3. Cytoplasm- Cytoplasm is a sticky, semifluid material found between the nucleus and the cell membrane. Chemical analysis of the cytoplasm shows that it consists of proteins, lipids, carbohydrates, minerals, salts, and water. Each of these substances other than water varies greatly from one cell to the next and form one organism to the next. The cytoplasm is the background for all chemical reactions that take place in the cell, such as protein synthesis an cellular respiration. Molecules are transported about the cell by the circular motion of the cytoplasm. Embedded in the cytoplasm are organelles, or cell structures that help a cell to function.

Answer 2

there's definitely more than three parts of a cell but I'm guessing you want:

(this is for eukaryotic animal cells)

- cell membrane : maintains homeostasis by allowing cell to control what enters and exits, also contains all of the organelles and cytoplasm

- cytoplasm : watery substance in which the organelles are suspended, allows things to exist in solution inside cells and also provides volume and structure

- organelles : membrane-contained 'cell organs' that perform the various functions of the cell, including respiration, housing DNA, producing proteins, etc. prokaryotic cells do not have organelles

Answer 3

The three basic parts of a cell are the plasma membrane, the cytoplasm, and the nucleus.