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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).
Each of the three eukaryotic RNA polymerases has more subunits or 12 and so these are big complex enzymes. The genes encoding some of the subunits of each eukaryotic enzyme show
Explain Genital herpes Acyclovir (Zovirax, and others), famciclovir (Famvir) or valacyclovir (Valtrex) taken orally for 7-10 days shortens the duration of pain, viral sheddi
An experiment supported by NASA calculated the heights of 6 men rapidly before going to bed, and then again after 3 days of bed rest. The data were as follows: What is the 95% con
Process of Regeneration in Planarians Regeneration in planarians has been broadly studied and considerable information regarding this phenomenon is now available. Let us see w
Coding sequence is the portion of the gene or the mRNA which actually codes for a protein. Introns are not coding for the sequences; nor are the 5' or 3' untranslated regions (or
Q. Technical Requirements for pulmonary angiography? Digital subtraction pulmonary angiography with selective pulmonary arterial injections is vastly superior to conventional c
Growing roots from different parts of plants Secure a box of sand and place it away from direct sunlight. Wet the sand thoroughly and keep it moist. Plant the following thi
(a)State the law of independent assortment. (b )Using punnett square demonstrate the law of independent assortment in a dihybrid cross including two heterozygous parents.
Please explain the differences between an integral membrane protein, a Davison-Danielli peripheral membrane protein, and a protein in which alpha-helices would not be found.
Cleavage of fructose-1,6-bisphosphate Aldolase cleaves fructose-1, 6-bisphosphate to dihydroxyacetone phosphate and glyceraldehyde-3-phosphate in the reversible reaction.
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