name three structural features which are common in all cells
Answers
Answer:
All cells share four common components: (1) a plasma membrane, an outer covering that separates the cell’s interior from its surrounding environment; (2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; (3) DNA, the genetic material of the cell; and (4) ribosomes, particles that synthesize proteins. However, prokaryotes differ from eukaryotic cells in several ways.
In this illustration, the prokaryotic cell has an oval shape. The circular chromosome is concentrated in a region called the nucleoid. The fluid inside the cell is called the cytoplasm. Ribosomes, depicted as small circles, float in the cytoplasm. The cytoplasm is encased by a plasma membrane, which in turn is encased by a cell wall. A capsule surrounds the cell wall. The bacterium depicted has a flagellum protruding from one narrow end. Pili are small protrusions that project from the capsule in all directions.
Figure 1. This figure shows the generalized structure of a prokaryotic cell.
A prokaryotic cell
Answer:
The common features of prokaryotic and eukaryotic cells are:
1) DNA, the genetic material contained in one or more chromosomes and located in the nucleoid (nuclear membrane absent) region in prokaryotes and a membrane-bound nucleus in eukaryotes.
2) Plasma membrane, a phospholipid bilayer with proteins that separates the cell from the surrounding environment and functions as a selective barrier for the import and export of materials.
3) Cytoplasm, the rest of the material of the cell within the plasma membrane (excluding the nucleoid region or nucleus) that consists of a fluid portion called the cytosol and the organelles and other particulates suspended in it.
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