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What is the virus that causes flu? Why doesn't the body create permanent immunity against that virus? How does the vaccine against flu work?
Flu is a disease caused by the influenza virus, a highly mutant DNA virus. Because of the high mutation rate of the virus, that forms many dissimilar strains, flu always presents epidemic features in affected populations and people may have some flu episodes during life (the immune response made from previous infections is not efficient in future infections).
The vaccine against flu is a vaccine made of attenuated virus of three dissimilar strains. Each year the WHO (World Health Organization) researches and determines which are the strains that should compose the vaccine. This is a method to face the high mutation rate of the virus.
The genotype of a plant showing the dominant phenotype can be determined by : 1. Test cross 2. Dihybrid cross 3. Pedigree analysis 4. Back cross It is determined
Oxidation Some enzymes which have the sulfhydryl (-SH) group in the catalytic site are very sensitive to oxidation. Due to oxidation of the -SH group by aerial oxygen
Q. Can the heat capacity of water be considered small or large? What is the biological consequence of that characteristic? From Thermology it is acknowledged that the quantity
CHROMOLIPID Formed by lipid & pigment, eg. carotene, xanthophylls. Lycopene present in tomato & red chilli. Carrot is rich in b-carotene, converted into vitamin A.
CT is a 3 year old female who develops signs of hypoglycemia in the early morning unless she is fed during the night. CT eats balanced meals for her age group during the day, with
Nursing Assessment If you observe a child of thalassemia major you can identify the following clinical manifestations: Anaemia with haemoglobin level of 3 to 8 gm per ce
Phycomycosis (zygomycosis) Zygomycosis (previously known phycomycosis) involves fungi belonging to genera Mucor, Rhizopus, Absidia, Entomophthora, Mortierella and Basidiobolou
A v i a n leukosis (Sarcoma group of retroviruses) This is a complex of viral diseases caused by an avian retrovirus with various manifestations such as lymphoid leukosis,
Feline calcivirus infection This disease is caused by a virus under the family Caliciviridae. Its symptoms include rhinitis, tracheitis and pneumonia. The animals are lethargi
MULTIPLE ALLELES (i) More than two alternative forms (alleles) of a gene in a population occupying the same locus on a chromosome or its homologue are known as multiple
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