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Q. Why is it difficult to produce efficient vaccines against a viral infection like dengue and AIDS?
It is difficult to make vaccines for dengue because there are four different types of viruses that cause the disease (DEN1, DEN2, DEN3 and DEN4) and it is supposed that the protection against one of them aggravates the clinical manifestation when the person is later infected by the another dengue virus similarly, In the case of HIV, the production of a vaccine is difficult because the virus is highly evades and mutant the antibody action.
Q. What are the extraembryonic membranes present in vertebrates? The extraembryonic membranes that may be present in vertebrates are the yolk sac, the amnion, the placenta, the
Why do vestigial structures persist in modern organisms? Explain the evidence that indicates that species evolve over time. The environment will not select for or against
How do the cheek and onion cells visually resemble one another, and why are shapes of squamous cells so different than the onion cells?
explain the genotypes for each blood type and how this is an example of codominance. Blood type- A, AB, B, 0
Q. Bird identity card. How are birds characterized according to examples of representing beings, basic morphology, respiration, skin, nitrogen waste, circulation,thermal control an
Chronic Bronchitis Chronic Bronchitis is defined clinically as hypersecretion of mucus and recurrent episode of productive cough for a period of 3 months per year at least tw
Q. Show types of hiatus hernia? Depending on the extent of herniation and placement of stomach, it could be of two types: 1, Para Oesophageal Hernia (oesophagus is in normal
Are the growth and development of plants only influenced by plant hormones? Chemical and Physical environmental factors, like position and intensity of light in relation to the
A flashlight with a 6-volt bulb draws 2 amps from its batteries. What is the resistance of its circuitry?
Nervous System of Asteroidea The nervous system of steroids is not ganglionated and is closely related with epidermis. It consists mainly of a circumoral nerve ring surroundin
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