Question
Do amino acids exist as Zwitter ion. Give its structure. Why is it formed?

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During resting potential, the axonal membrane is polarised, indicate the movement of +ve and –ve ions leading to polarisation diagrammatically.
A man is admitted to a hospital. He is suffering from an abnormal low body temperature, loss of appetite and extreme thirst. The doctor consoled him and also prescribed brain scan as he suspected, there would be a tumour in his brain.
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  2. Which part of the brain would probably show a tumour?
  3. Identify the location of hypothalamus.
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What do you understand by binomial system? Please clarify by example.
Give scientific reasons of the following statements:
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  2. Parathormone is also called Collip's hormone.
  3. The hormones released by the posterior lobe of pituitary are not its own products.
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While teaching cell division in the class, teacher told that during meiosis, the chromosome number is reduced to half of the parent, whereas during mitosis, the number remains the same. Seema was not able to recognise what teacher explained in the class and asked her elder brother, a botany student, the need of reducing chromosomes during gamete formation and what will happen if chromosome number will not reduced to its half. He explained the concept in detail to Seema.
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  2. How does meiosis help in evolution?
  3. Give the significance of meiosis.
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How will you define life as a biologist? What features make you different from non-living things?

Why has the mouse survived in the set-up B but died in the first set-up A? Who conducted this experiment? What did he conclude from this experiment?

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