Syed Ali Academy

Q :4 enlist bioelements that make 98% of living system. These are the following elements that make 98% of our living system Oxygen 65% Carbon 18% Hydrogen 10% Nitrogen 3%  Calcium 1.5% sulfur 0.25%  Phosphorus 1% Q 5: Why fats produce more energy than carbohydrates? Because there are so many carbons in three fatty acids, and each 2-carbon unit can enter the citric acid cycle (Krebs cycle), one fatty acid molecule can generate much more ATP than one molecule of glucose Q7: distinguish between saturated and unsaturated acyl glycerol Unsaturated acyl glycerol (oils) Unsaturated acyl glycerol are derived from plants They are liquid at room temperature They contain one or more double bonds between carbon carbon atoms in their chain Saturated acyl glycerol Saturated acyl glycerol are derived from animal source They are solid at room temperature They contain single bond between carbon atoms in their long chain

 Q.NO 1 why lysosomes are called suicidal sacs? ans: Lysosomes are capable of digesting nucleic acid, polysaccharides, fats, and proteins because they contain many different digestive enzymes. Along with them lysosomes also digest or damage its own cells by its own enzymes, which lead to cell death when the membrane of lysosomes is ruptured and enzymes are set free. This process is called as autolysis. Hence lysosomes are also called as suicide bags or suicidal sacs. Q.NO 2 why plasma membrane is differentially permeable in nature? Ans: Plasma membranes or cell membranes are differentially permeable or semi permeable to control the movement of substances into and out of the cells. They allow free diffusion of water and other non-ionic small molecules while preventing the diffusion of charged and large sized particles like glucose, amino acids and solutes etc, these large sized particle enter by the process of facilitate diffusion Q.NO 3 why plant cell wall is rigid? Ans: plant cell wal