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

When should eat a salad with lettuce, When you eat a salad with lettuce, cr...

When you eat a salad with lettuce, croutons, hard-boiled egg, bacon bits, and salad dressing, which one of those ingredients will be broken down the least by your digestive system?

What are the characteristics of soil, What are the characteristic of Soil ...

What are the characteristic of Soil It is commonly conceived as a plane at right angles to the surface. The upper part of a soil profile above the parent material in which proc

Is a viral infection treated with drug, Q. Is a viral infection treated wit...

Q. Is a viral infection treated with the same kind of drug that treats bacterial infections? The Antibacterial drugs, potent against a great variety of bacteria, are not effect

Obtaining blood cultures, • Blood cultures are critical in the diagnosis an...

• Blood cultures are critical in the diagnosis and management of IE. • Obtain blood cultures before starting antimicrobial therapy whenever possible. • Intravascular infection l

Maintenance of gut lining, Maintenance of Gut Lining After studying th...

Maintenance of Gut Lining After studying the digestive enzymes you would wonder why the gut linings are not digested themselves. This is because animals have several mechanism

Carbohydrates, Carbohydrates Fifty five to seventy per cent of the re...

Carbohydrates Fifty five to seventy per cent of the required energy in animals is derived from carbohydrates. However, fats and proteins can also be broken down and used for

Define the absorption of vitamin a, Define the Absorption of Vitamin A? ...

Define the Absorption of Vitamin A? Vitamin A and carotenoid tend to aggregate with lipids into globules, which then pass into the small intestine. Dietary vitamin A (retinol)

Explain why exact replication of dna is necessary, Figure  shows part of a ...

Figure  shows part of a DNA molecule (a) (i) What do the dotted lines in Figure represent?  (ii) Name J to M. J.............................. K..............................

Define briefly about the nuts as protein source, Define briefly about the N...

Define briefly about the Nuts as protein source? Nuts are excellent sources of proteins. Examples of nuts include cashew nuts, almond nuts , hazel nuts , coconuts, walnuts, bra

Unit membrane model, structure explanation of unit membrane model

structure explanation of unit membrane model

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