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

Nerve cell - the basic unit, Nerve Cell - The Basic Unit The basic un...

Nerve Cell - The Basic Unit The basic unit of the nervous system is the nerve cell or neuron. A neuron is to the nervous system what a brick is to the building. It has a cell

Describe how many bones are there in human foot, Describe how many bones ar...

Describe how many bones are there in human foot The human foot is a great mechanical marvel. It has 26 bones, 29 joints, and 42, various ligaments, a sensitive and protective s

Multipotent scs-pulp tissue revascularization, Multipotent SCs: are cells ...

Multipotent SCs: are cells differentiated & form a number of other tissues, while their sources are not fetal tissue; umblical cord blood & postnatal stem cells including dental p

Explain operational taxonomic units - numerical taxonomy, Explain Operation...

Explain Operational Taxonomic Units - Numerical Taxonomy 1) Then the characters to be used for studying the OTUs are selected. Usually a large number of characters are taken as

Define the effect of niacin deficiency on skin, Define the effect of niacin...

Define the effect of niacin deficiency on Skin? Dermatitis is the characteristic feature of the' disease, It is symmetrical in distribution. In early stages, a bright red eryt

How linnaeus classify the plant kingdom, Q. How Linnaeus classify the plant...

Q. How Linnaeus classify the plant kingdom? Linnaeus classified the plant kingdom into 24 classes in his famous work 'Genera Plantarum' (1737) and 'Species Plantarum' (1753). I

How are human voices created, How are human voices created? Human voice...

How are human voices created? Human voice is formed with the help of muscles in the neck and the vocal cords. The tighter the vocal cords the higher the pitch of voice. This is

What are the five classes of vertebrates, Q. What are the five classes of v...

Q. What are the five classes of vertebrates? To which of these do human beings belong? The five classes of vertebrates are amphibians, reptiles, fishes (osteichthyes and chondr

Is the bone marrow made of osseous tissue, Q. In which bones can bone marro...

Q. In which bones can bone marrow chiefly be found? Is the bone marrow made of osseous tissue? Bone marrow can mainly be found in the internal cavities of flat bones, like the

Define the theory or principle of drying, Define the Theory or Principle of...

Define the Theory or Principle of Drying? Drying can be illustrated as the application of heat under controlled conditions to eliminate the majority of the water generally avai

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