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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.)
After the food intake is over, the food gets digested, assimilated and finally egested through the kidneys and anus. The urinary system: • Filters waste materials from the blood
Q. What are the kinds of fecundation that occur in arthropods? What is the predominant kind? In arthropods there are species having exterior fecundation and other species havin
Define Population size, inbreeding and genetic variation? "Darwin proposed, and modern evolutionary biology affirms, that evolution is relies on variation in the characteristic
Agroup of realated genera are classified as-?
Properties of Stem Cells Stem cells are defined by having 3 major properties: 1) They are capable of self-renewal. 2) They divide, some daughter cells give rise to cells
Functional Domains in Children There are three functional domains of particular interest in this age range: Attention, Memory, and Executive function. The
Soil-Environmental Components The word soil is derived from Latin word 'solum' meaning earthy material in which plants grow. The soil is the consolidated outer layer of the ear
Cellulose Cellulose is found in plants as microfibrils (2-20 nm diameter and 100-40,000 nm long). These form the structurally strong framework in the cell walls. Cellulose is
Q. Chronic complications of diabetes? These occur gradually when the diabetics do not monitor the blood sugar and they are careless about eating, exercise and the medications a
What is Chromosomes ? The terminology used to describe DNA replication may sometimes be confusing. Originally, the term "chromosome" referred to the structures seen through the
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