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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).
Define Rhizoids - Types of Hyphae? Rhizoids - These are brown slender root like structures which arise in cluster from each node of the stolon. These penetrate the substratum
why is it known as middle man
Hydrophilic and some lipophilic hormones bind to cell surface receptors. These are necessary membrane proteins located in the plasma membrane which bind the signaling mol
Why do membranes figure so prominently in eukaryotic cells? What essential function do they serve?
Nicotinic acid (Niacin) Niacin refers to both nicotinic acid and its amide derivative. Nicotinic acid occurs as white or almost white crystals or as a crystalline powder of the
Q. Explain about Lactose Intolerance? We commonly hear from people of all age groups, particularly children and elderly to be complaining of abdominal discomfort after consumin
Coiling of garden pea tendrils around any support is an example of: 1. Thigmotaxis 2. Thigmonasty 3. Thigmotropism 4. Thermotaxis Thigmotropism
Axon: Axon is a projection from the cell body. Each neuron has only one axon. Unlike dendrites, axons are very long and are usually unbranched structures. The axon
Explain the Pathogens of forest insects? Caterpillars that defoliate forest trees have main economic impacts. Many such species go through periodic outbreaks. The forces which
Water Stress - Responses of Plants to Stress Water stress in a plant can result from drought, excess salinity in the soil and very low or high temperatures. It has been found
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