14. If a competitive inhibitor of enzyme x was added to the reaction graphed abo

Question

14. If a competitive inhibitor of enzyme x was added to the reaction graphed above what would change a. Vmax would increase b. Km would increase c. The apparent substrate affinity of enzyme x would increase d. Km would decrease 15. African cattle herders are unusual in that... a. adults are strict carnivores b. adults and children both produce lactase. c. only adults produce lactase. d. adults do not produce lactase but they can drink milk without gut distress. 16. Which body component has the greatest mass in a normal, slender adult human? a. Proteins b. Lipids c. Nucleic acid d. Carbohydrates 17. The graph below, shows data gathered for two populations of people, one that has a high starch diet and the other that has a low startch diet. The bars referring to the high starch diet population is shifted to the right. Which of the following is the best description for the x-axis? N Median Mean s.d High starch 133 7 672 235 B Low starch 93 5 544 204 0.25 0.20 3 0.15 0.05 0.00 2 345678910 11 12 13 14 15 a. The number of lactase gene duplications b. The number of amylase gene copies c. The percentage of lactose intolerant genes d. The amount of amino acids absorbed into gut epithelia

Explanation / Answer

14.(b).Competitive inhibitors can only bind to E and not to ES. They increase Km by interfering with the binding of the substrate, but they do not affect Vmax because the inhibitordoes not change the catalysis in ES because it cannot bind to ES.

15.(b).Its a common fact that as we grow older,we loose to ability to digest milk because of insufficient production of lactase.But recent studies have discovered group of human populations which are lactose tolerant in their older ages also.These are the groups of african herders.It is believed that this ability has co evolved in them with cattles.

16.(a)

Protein: In a lean male, the percentages of protein and water are comparable. It's about 16 percent by mass. Muscles, including the heart, contain a lot of muscle. Hair and fingernails are protein. Skin contains a large amount of protein, too.

17.(b).Amyalse is required for digestion of starch.Amyalse is produced by salivery glands as well as pancreas.High starch content means low copy of amylase so digestion of starch is not upto mark while low strach content can be linked with high amylase copies which result in high amount of amylase to digest starch.

Hope this will help.

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