Protozoans - regeneration in invertebrates, Biology

Protozoans - Regeneration in Invertebrates

Most single celled animals such as protists, i.e. protozoans, regenerate very well. If part of the cytoplasm is removed from the amoeba it is readily replaced. An identical process takes place in flagellates and ciliates. In each instance, though, regeneration occurs only from that fragment of the animal (cell) which consists of the nucleus. A protozoan in which regeneration has been extensively studied is Stentor. It is a large ciliate organism where regeneration takes place only if both the cortical cytoplasm and nuclear genome (which is a large beaded macronucleus) are present in the pan that is to regenerate.

It regenerates in the same way as it reproduces. For reproduction it first divides transversely and after that each half reforms an entire animal. Likewise when Stentor is cut transversely into two halves, then the wound at each cut end heals. The anterior part reconstitutes first by regenerating its posterior end. After this the posterior cut end regenerates its anterior portion. So two animals are formed each complete with cortical cytoplasm and nuclear genome.

Posted Date: 1/31/2013 5:53:48 AM | Location : United States







Related Discussions:- Protozoans - regeneration in invertebrates, Assignment Help, Ask Question on Protozoans - regeneration in invertebrates, Get Answer, Expert's Help, Protozoans - regeneration in invertebrates Discussions

Write discussion on Protozoans - regeneration in invertebrates
Your posts are moderated
Related Questions
Q. What are the digestive functions of the liver? The liver has other digestive functions, besides making bile for release in the duodenum. The venous network that absorbs n

Q. What is the menstrual cycle? The menstrual cycle is the periodic succession of interactions between the organs and hormones of the female reproductive system after the begin

Illustrate about the neuropsychological assessment A neuropsychological assessment is a clinical examination of both the working brain and dysfunctional brain. Neuropsychologic

Determine Food Sources of Zinc? Zinc is normally associated with the protein and/or nucleic acid fraction of foods. Thus, foods high in proteins are good sources of zinc. Lean

Question 1 Write a short note on the following- Plasmids Retrotransposons Hfr Conjugation Generalized transduction Question 2 With the help of a neat diagra

Q. What do you know Zoological Parks? Zoological park has two faced aspects, the relationship between man and beast. There is awe and there is slaughter. There is worship and t

Q. After passing the epididymides through which structures do sperm cells go until exteriorization? After leaving the epididymis in the testicle sperm cells enters the vas defe

Q. Use of Sulphur dioxide and sulphites in microorganisms? Sulphur dioxide as a preservative in wine preparation has been in use since ancient times. It is also used in other f

Endocrine glands Endocrine glands have no ducts - so these are also called as ductless glandsĀ Eg.Pituitary etc., These glands secrete chemical substances called HORMONES

Explain Re- pera at ions and Other Interventions ? These are required for residual VSD with significant shunt, residual RV obstruction and pulmonary valve regurgitation in a fe