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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).
As the functions of individual genes become known, the power of this new biology can be used to change organisms in predictable and desirable pathways. Organisms which have been c
What structure does the sheath replace in a dicot?
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what is genitalia?
Q. Can Nutrition affecting the growth of microorganism? Ans. Food is food to humans and microbes - be it carbohydrates, proteins or fats. The nutritional requirements of b
How do contraceptive pills generally work? Contraceptive pills generally have the hormones estrogen and progesterone. If taken daily from the 4th day after menses the abnormal
Q. Can you explain Bacillus Cereus Poisoning? Ans. Bacillus cereus poisoning is caused by the organism which is a large (3-5 pm long .and 1-4 pm wide), gram po%tive,
What are the Symptoms of Brown-Sequard syndrome Symptoms of Brown-Sequard syndrome usually appear after an affected individual experiences a trauma to the neck or back. First s
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