Endoplasmic reticulum, Biology

Assignment Help:

ENDOPLASMIC RETICULUM (ER)

Eucaryotic celIs have two major compartments- nucleus and cytoplasm. Cytoplasm was known to have no structure until the discovery of electron micrsscope. That cytoplasm is permeated by a membranous network called endoplasmic reticulum (ER), was revealed only after the introduction of electron microscope. Endoplasmic reticulum is a three dimensional network of membrane channels which constitutes more than half of the total membrane of the cell, ER is a highly folded and convoluted structure and forms a single continuous sheet enclosing one continuous sac. The interior of the sac is called "cisternal space" or "ER lumen". This is separated from the cytoplasm also called cytosol by a single membrane which mediates the communication between these two compartments. ER provides the cell with a compartment for storage of substances to be kept separate from cytosol. In addition, it has a key role in the biosynthesis of macromolecules.

ER is a double membranous organelle which consists of interconnecting flattened sacs called cisternae or interconnected tubules or vesicles. Cisternae are temporary storage sites for nutrients (Figure shown below).

 

527_endoplasmic teticulum.jpg


Related Discussions:- Endoplasmic reticulum

Explain theory of gram staining of bacterial cultures, Explain Theory or Pr...

Explain Theory or Principle of Gram Staining of Bacterial Cultures? Foods are rich in various nutrients and can support the growth and survival of microorganisms. The microbial

Define advantages of using the plate counts method, Define Advantages of Us...

Define Advantages of Using the Plate Counts Method? 1. It is simple and sensitive method. 2. It provides viable count as only live cells will grow and produce the colony.

Zoonoses disease-contagious ecthyma/orf , Contagious ecthyma/ Orf Primaril...

Contagious ecthyma/ Orf Primarily it is a disease of sheep and goats caused by a dermotropic virus - Orf virus - that belongs to the Parapoxvirus genus of the family Poxviridae. T

How rb proteins phosphorylation affects the cell cycle, How Rb protein's ph...

How Rb protein's phosphorylation state affects the cell cycle and cancer progression. please put link or citation of where you find information.

What is the function of the testicles, Q. Concerning reproduction what is t...

Q. Concerning reproduction what is the function of the testicles? The testicles are the male gonad that is the organs where the production of gametes takes place. In human bein

Distinction between breathing and respiration, (a) What is the distinction ...

(a) What is the distinction among 'breathing' and 'respiration'? (b) What part do 'ventilation' and 'gaseous exchange' play in these processes?   (a) Breathing i

What was lamarcks explanation for the succession, What was Lamarck's explan...

What was Lamarck's explanation for the succession of fossils in a given location? ps: I want to the idea for the succession of fossils, not the whole difference between Darwin and

What is pulse rate, Pulse Each time the left ventricle contracts and fo...

Pulse Each time the left ventricle contracts and forces blood into the aorta, it expands to adjust additional blood. And blood already present is pushed to other section and al

What are the two main classes into which fishes are divided, What are the t...

What are the two main classes into which fishes are divided? Fishes are separated into two main classes: chondrichthyes, fishes with cartilaginous skeletons (sharks, rays, dog-

How many biochemicals would be detected, How many biochemicals would be det...

How many biochemicals would be detected in the stomach contents of an omnivorous dinosaur?

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