Prothoracic gland or ptc, Biology

Assignment Help:

Prothoracic Gland or PTC

Prothoracic gland (PTC) or moulting gland and ecdysone or moulting hormone

The 3rd endocrine gland-prothoracic gland- is an irregular branching mass of glandular cells situated in the prothorax (segment of the thorax which bears the anterior most of its three pairs of legs), in close association along with the tracheal lubes and secretes the hormone ecdysone that has been isolated and crystallized in pure form from Calliphora and from pupa of a silkworm. It is a unique water soluble steroid and is associated closely to cholesterol. Recent studies though show that all an ecdysone is converted into P ecdysone (ecdysterone) after liberation into the haemolymph and that ecdysterone is the active moulting hormone.

Ecdysterone exerts its effect directly on those cells concerned in growth and moulting; it activates them and stimulates them to renew protein synthesis. It is believed that it acts directly on those loci in the chromosomes that are concerned with growth. It induces characteristic puffing in the giant polytene chromosomes of Diptera. These puffs are referred to be the sites for the formation of the messenger R N A required for protein synthesis.


Related Discussions:- Prothoracic gland or ptc

Late recurrence of artgirza--recurrence of angina, Late recurrence of a...

Late recurrence of artgirza: This is a reflection of progress of disease in the native coronary arteries distal to the grafts or narrowing or blockage of one or more of the g

What is cost effective analysis, What is Cost Effective Analysis? Cost ...

What is Cost Effective Analysis? Cost effective analysis: Cost effective analysis provides for the choice of least expensive strategy at the least cost. Here the outcome is mea

Illustrate production of red blood cells, Q. What is the substance that sti...

Q. What is the substance that stimulates the production of red blood cells? Which is the organ that secretes it? Under what conditions does this secretion increase? The substan

circulation patterns, Normal 0 false false false EN-IN...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Blood flow systemic circuit (hepatic portal system) and the , Trace the flo...

Trace the flow of blood through the systemic circuit (hepatic portal system) and the pulmonary circuit, beginning and ending in the left ventricle. You will be using named chamber

What are peristaltic movements, What are peristaltic movements? What is the...

What are peristaltic movements? What is their role in human digestion? Peristalsis is the process of synchronized contractions of the muscular wall of the digestive tube. Peris

Corticosteroid, Corticosteroid Anti-inflammatory and immuno suppressiv...

Corticosteroid Anti-inflammatory and immuno suppressive. Route: Oral, parental, dose as prescribed. Side-effects: sodium and fluid retention, potassium and ca

.Botany, 57. While planning for an artificial hybridisation programme invol...

57. While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps will be irrelevant A usting of pollen on stigma B Collection

Taxol, Paclitaxel is a anticancer drug. It stabilizes microtubules and as a...

Paclitaxel is a anticancer drug. It stabilizes microtubules and as a result, interferes with the normal breakdown of microtubules (you will know about microtubules in future lectur

Protozoa, locomotion in parameceum

locomotion in parameceum

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd