17) What is an enzyme? 1. A protein participating in a metabolic reaction that i

Question

17) What is an enzyme? 1. A protein participating in a metabolic reaction that is required in order to maintain homeostasis A protein catalyst that lowers the activation energy of a reaction A protein catalyst that can turn any chemical reaction into a reversible reaction A substrate required for a reaction in order to take place 3. 4. 18) In every chemical reaction 1. atoms are broken down ical bonds change ucts are degraded 4 all of the above are true 19) When mixed with water, fatty acids will 1. produce micelles 2 be surrounded by hydration spheres 3. produce carbohydrates 4. produce a solution 20) A base will 1. accept protons 2. produce H accept OH 4. reduce the pH of the solution 21) Coca Cola has a pH of 2.8 while coffee has a pH of 6.0. This means that 1. coffee has many more H' than Coca Cola 2. Coca Cola has about double the amount of H' ions than coffee Coca Cola has over a 1000 times higher H+ concentration than coffee 4. Coffee has over a 1000 times higher H' concentration than Coca Cola 22) An important polysaccharide found at the liver is glycogen, which is produced in response to insulin 2. fructose, important in detoxification of the liver 3. glucose, which is produced in response to glucagon 4. cellulose, composed of multiple glucose residues 23) Triglycerides 1. contain three molecules of glycerol bound to one fatty acid 2. are an important component of cell membranes 3are important in energy storage 4. are precursors of steroid hormones 24) In a micelle I. phospholipids hide away from water, while glycolipids seek interaction with water 2. interaction with water is avoided 3. the hydrophilic group in phospholipids faces water 4. the non-polar part of the phospholipid interacts with water. 25) Enzymatic reactions are said to be saturated when the enzyme molecules that catabolize the reaction are inactivated or inhibited the pH is inappropriate for the reaction to take place the activation energy of the reaction is too high for the enzyme to work effectively D all enzyme molecules that catabolize the reaction are working at maximum speed 2. 3. 4.

Explanation / Answer

17- 2

18-2

19-2

20-1

Note - bases are those which accept hydrogen ion proton and release hydroxyl group OH-

They increases the ph of solution . Hydration sphere is formed when the solvent is water with non polar molecules. Enzyme are catalyst which reduce the raction activation eneertgy.

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