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Q. What is the virus that causes flu? Why doesn't the body produce permanent immunity against that virus? How does the vaccine against flu work?
Flu is a disease caused through the influenza virus, a highly mutant DNA virus, Due to the high mutation rate of the virus that forms many different strains flu always presents epidemic features in affected populations and people may have several flu episodes during life (the immune response made from previous infections is not proficient in future infections).
The injection against flu is a vaccine made of attenuated virus of three different strains. Each year the World Health Organization (WHO) researches and determines which the strains that should compose the vaccine are. This is a approach to face the high mutation rate of the virus.
Define Procedure for use Microbiological Laboratory Equipments? Now carry out this activity following the steps given herewith: 1. Observe each instrument (as mentioned abov
How is it explained that a person with the spinal cord sectioned at the cervical level is still able to perform the patellar reflex? The arch reflex depends only on the integr
Q. What is the crystallization of a virus? What is the significance of this process? Crystallization is the procedure of transformation of viral components into organized solid
Chemoreceptors These are receptors included in perception of chemical stimuli. You will see that there are three kinds of Chemoreceptors among metazoans: i) Those concerne
Controlled Hypothermia Although birds and mammals frequently function in the homeothermic mode and maintain relatively high stable temperatures, many mammals and some birds ha
Explain Procambium in primary growth in shoot ? The vascular tissue in the shoot is produced from a primary tissue called the procambium, located in the apical meristem. New vas
The principal nitrogenous excretory compound in humans is synthesised: 1. in kidneys but eliminated mostly through liver 2. in kidneys as well as eliminated by kidneys 3.
Tumor Suppressor Genes Tumor suppressor genes or anti-oncogenes generally inhibit cell division in cooperation with proto-oncogenes. The very existence of these genes prevent
Which of the following is true of energy? a. It can be transferred from one form to another with 100 percent efficiency. b. It can be created from nothing. c. It can be stored i
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