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In higher vertebrates, the immune system...

In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self-cells, then it leads to

A

Active immunity

B

Allergic response

C

Graft rejection

D

Auto-immune disease

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A system of greater disorder of molecules is more probable. The disorder of molecules is reflected by the entropy of the system. A liquid vapourizes to form a more disordered gas. When a solute is present, there is additional contribution to the entropy of the liquid due to increased randomness. As the entropy of solution is higher than that of pure liquid, there is weaker tendency to form the gas. Thus, a solute (non-volatile) lowers the vapour pressure of a liquid, and hence a higher boiling point of the solution. Similarly, the greater randomness of the solution opposes the tendercy to freeze. In consequence, a lower temperature must be reached for achieving the equilibrium between the solid (frozen solvent) and the solution. The elevation in boiling point (DeltaT_(b)) and depression in freezing point (DeltaT_(f)) of a solution are the colligative properties which depend only on the concentration of particles of the solute and not their identity. For dilute solutions, (DeltaT_(b)) and (DeltaT_(f)) are proportional to the molarity of the solute in the solution. A liquid possessing which of the following characteristics will be most suitable for determining the molecular mass of a compound by cryoscopic measurements?

A system of greater disorder of molecules is more probable. The disorder of molecules is reflected by the entropy of the system. A liquid vapourizes to form a more disordered gas. When a solute is present, there is additional contribution to the entropy of the liquid due to increased randomness. As the entropy of solution is higher than that of pure liquid, there is weaker tendency to form the gas. Thus, a solute (non-volatile) lowers the vapour pressure of a liquid, and hence a higher boiling point of the solution. Similarly, the greater randomness of the solution opposes the tendercy to freeze. In consequence, a lower temperature must be reached for achieving the equilibrium between the solid (frozen solvent) and the solution. The elevation in boiling point (DeltaT_(b)) and depression in freezing point (DeltaT_(f)) of a solution are the colligative properties which depend only on the concentration of particles of the solute and not their identity. For dilute solutions, (DeltaT_(b)) and (DeltaT_(f)) are proportional to the molarity of the solute in the solution. A mixture of two immiscible liquids at a constant pressure of 1.0 atm boils at temperature

TRUEMAN BIOLOGY-(AIPMT(NEET Phase-1)-2016)(Conducted by CBSE on 01-05-2016)(Solved Paper)-MCQs
  1. The taq polymerase enzyme is obtained from

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  2. Stems modlfted into flat green organs performing the functions of leav...

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  3. In higher vertebrates, the immune system can distinguish self-cells an...

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  4. Nomenclature is governed by certain universal rules. Which one of the ...

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  5. In bryophytes and pteridophytes, transport of male gametes requires

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  6. In context of Amniocentesis, which of the following statement is incor...

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  7. In the stomach, gastric acid is secreted by the

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  8. Spindle fibres attach on to

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  9. Which is the National Aquatic Animal of India

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  10. Which one of the following cell organelles is enclosed by a single...

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  11. The two polypeptides of human insulin are linked together by

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  12. In which of the following, all three are macronutrients?

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  13. Which of the following statements is wrong for viroids

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  14. Analogous crgans are a result of

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  15. Select the incorrect statement

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  16. Which one of the following characteristics is not shared by bird...

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  17. Which of the following statements is not correct ?

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  18. Seed formation without fertilization in flowering plants involes the p...

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  19. Which of the following approaches does not give the defined action of ...

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  20. The amino acid Tryptophan is the precursor for the synthesis of

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