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

What are the structures that form the external ear, Q. What are the structu...

Q. What are the structures that form the external ear? What is its function? The internal ear comprises the auricle or pinna and the auditory canal its function is to conduct t

What is the meaning of food exchanges, What is the meaning of Food Exchange...

What is the meaning of Food Exchanges Food exchanges mean grouping of foods in which the specified amount of all the food provides approximately equal amounts of carbohydrate,

Define intracellular cytoplasmic calcium concentration, How intracellular c...

How intracellular cytoplasmic calcium concentration is maintained? Intracellular cytoplasmic calcium concentration is maintained by the following mechanisms: a) Limited entr

Sulphur (s) - macronutrients, Sulphur (S) - Macronutrients Sulphur is ...

Sulphur (S) - Macronutrients Sulphur is present in the soil in inorganic and organic forms. In most soils organically bounds is the major S reservoir. The inorganic forms of S

Biomolecules, indicator for testing for the presence of sugar

indicator for testing for the presence of sugar

Excreation, What is the excreatory organ in agama lizard

What is the excreatory organ in agama lizard

What are the major types of animal tissue, Q. What are the major types of a...

Q. What are the major types of animal tissue? The major animal cell tissues are the epithelial tissue, the nervous tissue, the connective tissue and the muscle tissue.

Anatomy of the heart, The human heart is a cone-shaped, four-chambered musc...

The human heart is a cone-shaped, four-chambered muscular pump located in the mediastinal cavity of the thorax between the lungs and beneath the sternum, designed to ensure the cir

What is Bile salts , Bile salts or bile acids are polar derivatives of...

Bile salts or bile acids are polar derivatives of constitute and cholesterol the major pathway for the excretion of cholesterol in mammals.  In the liver, the cholesterol is circul

Oligochaetes - feeding and digestion in annelids, Oligochaetes - Feeding an...

Oligochaetes - Feeding and Digestion in Annelids In between annelids, the oligochaetes which comprise mostly earthworms, feed on dead, decomposing organic vegetation. They as

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