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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).
In a numeric pyramid to which trophic level does the base always refer? What about the top level? In a numeric pyramid the base corresponds to the first trophic level, i.e., to
Dietary Management The golden rule in the dietary management of ally fever is "feed the fever". Considering that enteric (typhoid) fever is accompanied by anorexia,
Q. What are the major parts of ferns? Ferns are constituted by small roots that come downwards from the rhizome stem and often horizontalized. The fronds also arise from the rh
Define Rheology and syneresis Rheology: the science of the deformation and flow of matter. It is the branch of physics concerned with the flow and change of shape of matter,
Oral Route Paediatric Medications are prepared as Tablets (which can be crushed), powders, granules, mixtures, emulsions, elixirs and syrups. It is easier to persuade olde
Tools and Techniques - Effects of Plant Growth Regulators We have discussed about the "effect of auxins". In this section we shall discuss the methodology being followed in h
Producers - Biotic Components Producers also called autotrophs are largely green plants that can make food from simple inorganic materials. Food refers to complex organic comp
Global Air Circulation The major wind systems of the earth result because large masses of air around the earth's equator are forced to rise from the bottom due to surface heati
Explain primary structure of proteins The primary structure of a protein having of the order in which amino acids are bonded to one another by a peptide bond.
Q. Describe about Collective or Universal consciousness? Neurochemicals and associated brain processes are simply channel selectors for various states of consciousness. All sta
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