Cells 7th Grade:)

Cells:)

Have you ever imagined that all living things have cells in them? And they are smaller than a human has on your body? Also did you know that there are two kinds of cells ?

Cell size :

Most cells are too small to be seen without a microscope. for example, human cells do need to cover the dot of the letter i . however, some cells are large . The reason why most cells are small is because cells absorb nutrients and get rid of waste through its outer surface.

Parts of a cell :

Cells have many different functions and come in many shapes and sizes. Some cells have common parts as the animal cell and plant cell. All cells are surrounded by a cell membrane . The cell membrane is a protective layer that covers the surface of the cell and acts as a barrier . Which also controls the materials that go in and out of the cell. The cells also have organelles that perform many processes. Arganeles are structures that perform specific functions within the cell . Different cells have different organelles . Some floating organelles in the cytoplasm , whereas others are associated organelles membranes , or other organelles . Another thing is that the cells have DNA. DNA is the genetic material is . DNA carries the information needed to produce new cells and organisms. DNA is passed from one parent to another parent and directs the activities of the cell. Some cells can live without DNA, but other cells can not. Most of the cells need to have DNA . DNA instructs cells how to make proteins.

Prokaryotes and eukaryotes

All cells have cell membranes , organelle , cytoplasm , and DNA. But there are two basic types of cells are prokaryotes and eukaryotes. A cell with a nucleus are eukaryotic . Pokaryotes cells are coreless . Bacteria and archaea are prokaryotes. Prokaryotes are single-celled organisms without a nucleus. Though prokaryotes have no nucleus have DNA. DNA of a prokaryotic cell is a large molecule . Having the shape of a rubber band. other than the prokaryotic cell has a membrane organelles . but lacking ribosomes .