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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.)
What is aneuploidy? What are the conditions caused by the aneuploidies? The Aneuploidy is an abnormal number of chromosomes in the cells of an individual. The major aneuploi
Palynofossil s (Microfossils) - Fossils of planktons, diatoms, unicellular algae (diatoms) and shelled protozoans. (Heliozoans, Radiolarian and Foraminifera). Its finding in s
Q. What are the four groups of protozoans? The four main groups of protozoans are the mastigophores flagellated, like the trypanosome that causes Chagas' disease, the sarcodine
What is Atraumatic needles Atraumatic needles with sutures comprise an eyeless needle attached to a specific length of suture thread. There are several shapes of surgical n
Why does bark often die and break naturally? The bark is the mature periderm of the stem, branches and roots. It dies and breaks when these structures grow and thus the perider
Q. What is the difference between anaerobic and aerobic beings? Anaerobic organisms are those that live or can live under oxygen-lacking environments and Aerobic organisms are
Q. What are the capillaries of the vascular system? Capillaries are small blood vessels that perform exchange of substances between the tissues and blood the body Capillaries a
Explain Procedure for Estimation of Sucrose by Fehling Soxhlet Method? Follow the proceedure enumerated herewith and carry out the experiment: 1. Standard titration (Standar
Where does Calvin cycle take place in chloroplast? Explain the cycle. a) Where is electron transport system operative in mitochondria? b) Explain the system highlighting the
Starch is one of the most common storage products in seeds. What happens to the starch before it can be used by the germinating seed? Starch is insoluble and has to be changed,
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