Eucaryotic cell structure , Biology

Eucaryotic cell structure

All eucaryotic cells have a cytoskeleton made up of a network of protein filaments (Figure shown below). This network gives the cell its shape, capacity to move and ability to transport organelles from one part of a cell to another. These protein filaments are similar in all eucaryotes. The important protein filaments are-actin and myosin in muscles and tubulin in microtubules. Actin and myosin are involved in muscle contraction and in the formation of microfilaments. Microtubules are hollow ~d form cilia, flagella, centriole and mitotic spindle. This kind of cytoskeleton is absent in the procaryotes.

446_Eurocrytic cell struc.jpg

In procaryotes the DNA molecule lies freely in the cytoplasm attached to the cell membrane. In eucaryotes it is enclosed inside the nucleus. This kind of formation of compartment protects DNA from many chemical changes that occur in the cytoplasm.

The DNA found in eucaryote is not only large (human cells contain DNA thousand times larger than that in a typical bacteria) but is also packed together with histones into / chromosomes. Histones are the proteins which are basic in nature, found in eucaryotes/They bind to DNA and wrap it up into compact chromosomes. Histones also-control the expression of the characters called gene expression. Histones are important proteins which have nbt undergone any change during evolution and are identical in all plant and animal cells studied so far. Division of the nucleus by mitosis is another characteristic of the eucaryotes which permits proper and equal distribution of the genetic material to the daugher cells. Ribosomes which are the granular structures consisting of RNA and proteins are necessary for protein synthesis. These are the only organelles that are common to both procaryotes and eucaryotes. However, there are some minor differences between procaryotic and eucaryotic ribosomes.

Posted Date: 12/9/2012 11:58:14 PM | Location : United States

Related Discussions:- Eucaryotic cell structure , Assignment Help, Ask Question on Eucaryotic cell structure , Get Answer, Expert's Help, Eucaryotic cell structure Discussions

Write discussion on Eucaryotic cell structure
Your posts are moderated
Related Questions
how do flatworm and round worms respire?

Sulphur is one of important of proteins vitamins and hormones. It plays a very crucial role in health of both plants and animals. Most of earth sulphur is tied up in rocks and salt

Im learning about difference cell structures in science. I was wondering if I might be able to get some information about the epithelial tissue, and the connective tissue. Thankyou

Q. Write the meaning of Hyperglycemia? Hyperglycemia is a Greek term: hyper -meaning excessive; glyc - meaning sweet; and emia- means "of the blood". It is a condition in whic

Explain the basic Concept of Energy? Energy in simple terms may be defined as the ability, or power, to do work. As a student of dietetics and nutrition, you already know that

Define Drug effects on Lipid Metabolism? Drugs can affect the metabolism of various essential nutrients in the body. These impairments are highlighted herewith: Lipid metabo

Define factors affect the rate and total drying time? Four main factors affect the rate and total drying time, which include: a) The properties of the products (the moisture

what are the gonad gland disorders and what do they do

Passage of Pollen Tube In cotton, the pollen produces a tube within an hour which grows on the surface of the stigmatic hairs, and then between the cells of the stigma at the