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
Explain Problems of Infants and Preschoolers Nutrition? In spite of all nutrition interventions, there are some of the common yet life threatening problems which need to be loo

β - Pleated Sheets In this inter molecular hydrogen bonds are present Two or more polypeptide chains come together and from a sheet. Condensation in little. However

Explain Cytological Approach in Taxonomy Cytotaxonomy deals with all the aspects of taxonomy at a cellular level. This includes, the structural, genetic and biochemical aspect

Gene or point mutations occur when the DNA sequence of a gene is altered and the new nucleotide sequence is passed on to the offspring. This occurs either due to addition or deleti

Oreopithecus, a late rniocene primate had very close resemblances to those of gibbons, although the tooth structure showed that the animal was only a monkey and not a hominoid. Ano

Q. Nutritional Management in Inflammatory Bowel Disease? Adequacy of nutritional needs and minimizing stress on the inflamed or narrowed segment of the bowel are the main princ

Pound cake test In some cases, oil or margarine creaming volume is most accuratelymeasured by preparing a regular pound cake, omitting the chemical leavener andmeasuring the vo

How many distinct hexapeptides can be made from 20 amino acids?

Q. What are the gynoecium and the androecium? What are the other structures of flowers? Androecium is set of male reproductive structures of flowers it comprehends the stamens