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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.
Menerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock.
Explain how human activities can cause an imbalance in biogeochemical cycling and lead to problems such as cultural eutrophication and fish kills
Acellular and Cellular Organisms you should be able to characterise living and non- living matter. However, the boundary-line between the two is not very precise. As you have
Explain function of lymph nodes? Lymph nodes have white blood cells which ingest bacteria and prevent them from reaching the circulation.
Differentiate soil horizons and mong the soil groups To make precise differentiation among soil horizons and among the soil groups, the field data on soil morphology are suppor
Q. What is the difference between rough and smooth endoplasmic reticulum? The endoplasmic reticulum is a delicate membranous structure contiguous to the nuclear membrane as wel
male sex organ
What is monera? One of the 5 main kingdoms contains bacteria and blue/green algae. Does NOT have a cell membrane, or in other words, is made of prokaryotic cells. Actually,
Osmoregulation in Marine Non-Chordate Metazoans Studies on the osmotic pressure of body fluids of marine organisms have displayed that their internal osmotic pressure is more
Codex code of practice Codex Alimentarious Commission (CAD) was established in 1963 with the objective to develop International Food Safety Standards to protect human health, w
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