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Sunday, January 1, 2012

Great Features of Little Organelles in the Cell

Today is the first day of 2012. So I thought to write about a short post. It's about organelles.

Organelles

The various structures adapted for doing various purposes in a cell are known as organelles. Let me tell you more details about organelles and their features. Here we go..!

There are number of organelles in the cell. I'm going to explain one by one. so the first one is nucleus.

Nucleus

Organelles of a Cell
Organelles of a Cell
Nucleus is the structure which controls all the activities of the cell. The largest organelle in the cell is the nucleus. Nucleus is covered within two membranes. Inside the nucleus there is a nucleolus and chromatin fiber. Chromatin fiber is responsible for carrying hereditary characteristics.

Chloroplast

Chloroplasts are present only in plant cells. The grana present in chloroplasts contain pigment called chlorophyll. In addition there is some other pigment called carotene and santhophyll. DNA and starch grains are present in chloroplast. It is the organelle in which photosynthesis takes place producing food using light energy trapped by chlorophyll.

Mitochondria

It is covered by two membranes, the inner being folded to form cristae to increase the surface are. The reactions occur in mitochondria supply energy for all the activities in the cell.

Golgi Bodies

It is present in every nucleate cell. It is a flattened, membrane -Bounded sac. It is formed at one end of the stack, endoplasmic reticulum and budded off as vesicles at the other end. This is an internal process and a transport system, the Golgi vesicles transport the materials to other parts of the cell. For example, the Golgi bodies of the cells in pancreas produce trypginogen enzyme by allowing to react the protein with carbohydrates.

Endoplasmic Reticulum

It is present in every nucleate cell. It is tubular structure bounded by two membranes. It is bounded with outer membrane of the nuclear envelope. The ribosomes are found on the outer membrane. R.N.A on the endoplasmic reticulum is important in the synthesis of protein. It also helps to transport nuclear material from cell to cell.

See you soon with another long post about Plant Tissues. Very long one and very explained one. And of course there is a post about Animal Tissues too. That's the biggest one. Wait for it!

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