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Q. Why does not a long lasting vaccine against common cold exist yet?
Viruses that present a high mutation rate like the virus that causes the common cold escape easily from the action of vaccines against them. After a primary immune response (artificially or natural induced) against the virus in the next season of infection new mutant resistant strains appear and the protection obtained with the immune response of the last season is lost (One could say that the high mutation rate is a form of "immunization" found by these viruses.)
Q. How are the triglycerides made? Triglycerides, oils or fats, are made of one molecule of glycerol bound to three molecules of fatty acids. Hydroxyls of each one of the three
What is cloning? Cloning is the making of an organism genetically the same to another by means of genetic engineering. The basis of cloning is the nucleus transplantation ma
Direct demonstration of the causative agent by electron microscopy (EM): Where facilities for electron microscopy are available and a viral disease is suspected, presence o
Determine the Occurrence of vitamin K Vitamin K is found naturally in plants and vitamin K2 is synthesized by the bacteria in the intestines in humans. In nature, only two nap
Complement system is a chemical defense system which kills the microorganisms directly, it supplements inflammatory response, and works with, or complements, the immune system.
1. Carbon monoxide (CO): It is colourless, odourless, tasteless gas and is not soluble in water. Source: CO is produced due to: (i) Incomplete combustion of fuels
Define the Classification of Carbohydrates? If you go back and read up your theory, you will recall that there are four main classes of carbohydrates based on the number of mon
Exercise- Heat Production During physical activity heat production by exercise can to some extent substitute for heat generated by shivering. However, exercise also tends to
What is Nutrition? Explain types of nutrition? Nutrition - Taking Nutrients from environment Nutrients - Substances which are needed for the sources of chemical potential en
What is the special characteristic of (a) stem cells, (b) embryonic stem cells? (a) Stem cells can continue to divide throughout their life. (b)The special characteristic of
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