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

Determine general principles of allergy management, Determine General Princ...

Determine General Principles of Allergy Management? The four general principles of allergy management include: 1.  Avoid factors that cause symptoms. 2.  Use appropriate

Presenting features of exstrophy of the bladder, Presenting Features ...

Presenting Features Anterior abdominal wall and anterior bladder wall is deficient and on the surface everted posterior wall of bladder with two ureteric orifices is seen.

Define effect of dietary fibre expect physiological effects, Define effect ...

Define effect of dietary fibre expect physiological effects? In addition to all the physiological effects mentioned above, dietary fibre may exert other effects. Acetate and pr

Explain about steatorrhoea, Q. Explain about Steatorrhoea? Steatorrhoea...

Q. Explain about Steatorrhoea? Steatorrhoea is a symptom of the disorders of fat metabolism and malabsorption syndrome and can be defined as n condition of foul-smelling bulky

Explain the physiological effects of ingestion of fibres, Explain the Physi...

Explain the Physiological effects of ingestion of fibres? Physiological effects of ingestion of fibres with adsorption properties are: 1. Diminished absorption of lipids. Wi

What is the importance of surface area, A. How is the villus the functional...

A. How is the villus the functional unit of the small intestine? In your answer, include a discussion of its structure and function and the enzymes found there. What is the importa

Describe animal which limits activity to period of dim light, Which term is...

Which term is used to describe an animal which limits its activity to periods of dim light at dawn and dusk? a) Diurnal (pron: die-ER-nal) b) Vesperal (pron: VESS-per-al)

Determine causes of iron deficiency anaemia, Determine Causes of Iron Defic...

Determine Causes of Iron Deficiency Anaemia? Dietary Inadequacy Poor bioavailability of iron Presence of absorption interfering substances in diet Poverty and

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