Question

30. An isotonic solution means that the solute concentration outside the cell: A. Is slightly less than inside the cell B. Is much greater than inside the cell C. Is much less than inside the cell D. Is same as inside the cell E. Is slightly greater than inside the cell 31. A solvent is a A .A salt or sugar B. One component of a cell membrane C. The substance in which a solutes are dissolved D. Selectively permable 32. Catechol is converted to quinine by the removal of hydrogen which is combine with to form water A. Carbon B. Nitrogen С. Oxygen D. Phosphorus 33. In the reaction above, the catechol is A. Reduced B. Oxidized C. Energized D. None of the above 34. A cell placed in a hypotonic solution will: A. Neither gain nor lose water B. Lose water C. Both gain and lose water equally D. Gain water E. Gain water initially and then lose water 35. The basic unit of structure and function for all life is the A molecule. B. organism. C. atom. D. cell. E. organ 36. Benedict's test is used to test for the presence of what organic molecule? A. Proteins B. Lipids C. Simple sugars D. Nucleic acids

Answer 1

Ans. 30. The tonicity of a solution is a measure of the amount of osmosis that will take place between two solutions separated by a semi permeable membrane. The term 'isotonic' means two solutions with same tonicity. As both the solutions have same tonicity, so osmosis will not take place on either side of semi permeable membrane.

So, the answer is option D.

31. A solvent is a substance in which another substance called solute is dissolved. The solute may be a salt or sugar, or any other liquid, or even a gas. The solute dissolved in solvent forms the solution.

So, the answer is option C.

32. The conversion of catechol to quinine is a redox reaction in which catechol is oxidized to quinine. The hydrogen that is removed from catechol combines with oxygen to form water.

So, the answer is option C.

33. In the above reaction, hydrogen is removed from catechol. So, catechol is oxidized.

So, the answer is option B.

34. When a cell is placed in a hypotonic solution, the concentration of solutes within the cell is greater than the concentration of solutes outside the cell. Therefore, the cell draws in water into the cell sap by the process of endosmosis.

So, the answer is option D.

35. The cell is the structural and functional unit of living organisms. Each cell is again made up of various macromolecules which are in turn made up of various atoms. A group of cells together form a tissue which in turn form an organ.

So, the answer is option D.

36. A cell is made up of various organic molecules. One of them is carbohydrates which are made up of sugars. Benedict's test is used to detect the presence of sugar in a given sample.

So, the answer is option C.