what is cell
with diagram
Answers
All plant and animal cells have cell membranes. The cell membrane surrounds and protects the cytoplasm. Cytoplasm is part of the protoplasm and is the living component of the cell. The cell membrane is composed of a double layer (bilayer) of special lipids (fats) called phospholipids.
Explanation:
The cell theory developed in 1839 by microbiologists Schleiden and Schwann describes the properties of cells. It is an explanation of the relationship between cells and living things. The theory states that:
all living things are made of cells and their products.
new cells are created by old cells dividing into two.
cells are the basic building blocks of life.
The cell theory applies to all living things, however big or small. The modern understanding of cell theory extends the concepts of the original cell theory to include the following:
The activity of an organism depends on the total activity of independent cells.
Energy flow occurs in cells through the breakdown of carbohydrates by respiration.
Cells contain the information necessary for the creation of new cells. This information is known as 'hereditary information' and is contained within DNA.
The contents of cells from similar species are basically the same.