Question

comparisions between bacterim cell ,plant cell and animal cell.

Answer 1

1. Cell Wall

Plant Cells: Plant cell walls are made mainly of cellulose.
Animal Cells: None
Bacteria Cells: Prokaryotic cell walls are made of murein.

2. Cell Nucleus

Plant Cells: Controls the activity of the cell and contains the genetic material. Each cell nucleus is surrounded by a double nuclear membrane that is crossed by nuclear pores.
Animal Cells: Controls cell activity and contains the genetic material. The largest cellular organelle in animal cells, surrounded by a double nuclear membrane crossed by nuclear pores. Most animal cells have one nucleus, but:
Some very large cells (e.g. some striated muscle fibres) have many nuclei. Such multinucleate cells are called coenocytes.
Some special cells (e.g. erythrocytes) have no nucleus. Cells that have no nucleus are called anucleated cells.
Bacteria Cells: None

3. Plasmids

Plant Cells: None
Animal Cells: None
Bacteria Cells: A plasmid is a molecule of DNA that is separate from and can replicate independently of the chromosomal DNA. They are double-stranded, generally circular, and capable of replicating autonomously within a suitable host.

4. Mitochondria (pl.). sing = mitochondrion

Plant Cells and
Animal Cells: Mitochondria provide the cells' energy requirements. In the same way as cell nuclei they have a double membrane. The outer membrane of a mitochondrion is smooth while the inner membrane forms folds called cristae to increase the inner membrane's surface area on which sugar combines with oxygen to produce ATP - the cell's primary energy source.
Bacteria Cells: None

5. Ribosomes

Plant Cells and
Animal Cells: The ribosomes present in plant and animal cells are the larger (80 S) type of ribosomes but are the smallest and most numerous of the eukaryotic cell organelles. They are composed of protein and RNA and are the sites of protein synthesis.
Ribosomes can exist free in the cytoplasm but are usually found attached to rough endoplasmic reticulum (RER). The ribosomes in eukaryotic cells are made in the nucleolus - which is inside the cell's nucleus.
Bacteria Cells: Ribosomes are present - but are very small. That is, the ribosomes in prokaryotic cells (i.e. bacterial cells) are the smaller (70 S) type.

6. Chloroplasts

Plant Cells: Chloroplasts are green (because they contain the pigment chlorophyll) and are members of a class of organelles called plastids. They capture light energy, store it in the molecules ATP and NADPH, then use it to produce organic molecules and free oxygen from carbon dioxide and water by the process of photosynthesis.
Animal Cells: None
Bacteria Cells: None

7. Permanent vacuole

Plant Cells: Contains water needed for turgor pressure (turgidity) - that pushes the plasma membrane, which is also called the cell membrane, against the cell wall. Plants need turgidity to maintain rigidity. Molecules and ions may also be stored in the permanent vacuole.
Animal Cells: None
Bacteria Cells: None