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

Explain the urinary system in human body, Explain the Urinary System in hum...

Explain the Urinary System in human body? The urinary system removes the waste materials produced as a result of all the metabolic process required to sustain life. The process

Bergmann's method of cell plating, Bergmann's Method of Cell Plating I...

Bergmann's Method of Cell Plating In this method free cells are suspended in a liquid medium at a density twice the finally desired plating density. Melted agar containing med

Explain a renewable exhaustible natural resource, A renewable exhaustible n...

A renewable exhaustible natural resource is: 1. Coal 2. Petroleum 3. Minerals 4. Forest Forest is a renewable exhaustible natural resource

Physical environment and genetics, Physical Environment and Genetic Phy...

Physical Environment and Genetic Physical Environment : Safe water and clean air, healthy workplace, safe houses, communication and roads all contribute to good health. The

Define factors that are involved in the regulation, Describe the factors th...

Describe the factors that are involved in the regulation of respiration in a child who decides to hold his/her breath for as long as possible.

Identical chromatids bound, Q. What is the structure that to maintains iden...

Q. What is the structure that to maintains identical chromatids bound? The structure that to maintains identical chromatids bound is the centromere.

Define tubular-dorsal nervous system, Q. How can the tubular-dorsal nervous...

Q. How can the tubular-dorsal nervous system in chordates be compared to the nervous pattern present in invertebrates? In chordates the nervous system is dorsal and highly ceph

Density independent factors, Density Independent Factors Density inde...

Density Independent Factors Density independent factors are the extrinsic factors which tend to regulate the density of a population in ways that are not correlated with its

Explain water-soluble and fat-soluble vitamins, What is the difference betw...

What is the difference between water-soluble and fat-soluble vitamins? Why can fat-soluble vitamins cause harm when ingested in excess? Water-soluble vitamins are those soluble

What is a test tube and how is it used, What is a test tube and how is it u...

What is a test tube and how is it used? A test tube is a clear, cylindrical glass tube generally open at one end and rounded at the other, used in laboratory experimentation.

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