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Fischer 's template or lock and key model
According to this model, the catalytic site of the enzyme has a proper conformation compatible to a specific substrate even in the absence of the substrate molecule. The catalytic site binds the substrate and catalyzes the reaction without any change in its own three dimensional conformation. It has become possible to explain the specificity of many enzymes for only one of the stereoisomers of the substrate by this model.
RESPIR A T ORY ORGANS IN ANIMALS - In Protozoa plasmalemma functions as respiratory surface. In Porifera, respiration occur through body wall. In Coelentrata resp
Which are the heart chambers respectively where the entrance and the exit of blood occur? The heart chambers by which blood enters the heart are the atria. There are the right
Q. Why does thymine replace uracil in DNA? The difference between DNA and RNA is existence of a hydroxyl (-OH) group on 2' carbon of the ribose sugar in the backbone. Removal o
Suppuration High number of PMN cells have been detected around implants that are associated with severe signs of mucosal inflammation. Several studies have shown the presence o
COMPOSITION Proteins = 44-76%, Lipids = 20-53%, Carbohydrates = 1-8%, (Protein-Lipid ratio = 0.8 : 1 to 4 : 1) Most of lipid are "Phospholipids" which are amphipat
Q. Show Artificial systems of classification of plants? Carolus Linnaeus (1707-1778) popularly known as Carl Von Linne was born on May 1707 at Result, a small village in Smalan
Determine the nutritional needs of humans? In the previous unit, we saw how involvement in sport or vigorous activities can affect the body's nutrient needs. In this unit, we w
What is the photoperiod? The Photoperiod is the daily time period of light exposure of a living being and the photoperiod may differ according to the period of the year.
discuss the importance of protozoa to humans
Why do some trees lose their green color in the autumn? In autumn days become shorter and nights longer therefore there is a reduction of the photosynthesis rate and some plant
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