PRS questions for second exam

PRS questions for second exam - 2/20/2012 1 A reaction can...

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Unformatted text preview: 2/20/2012 1 A reaction can run in a cell in spite of a positive G if T h e su b s tra te . . T h e p ro d u c t is. . E ith e r o f th e . . N e ith e r o f th e . . 16% 5% 60% 20% 1. The substrate is added to high levels 2. The product is taken away 3. Either of the above 4. Neither of the above Glycolysis requires ATP T ru e F a lse 6% 94% 1. True 2. False Oxidation of glucose via glycolysis requires molecular oxygen T ru e F a lse 89% 11% 1. True 2. False Which molecule has less internal energy? M e th a n e C a rb o n d io x id e 60% 40% 1. Methane 2. Carbon dioxide If the cell has a lot of ATP, the first step of glycolysis is shut down. Y e s N o 87% 13% 1. Yes 2. No At high ATP concentrations, phosphofructokinase is a ctiv e ly p ro d u . . n o t p ro d u c in g . . 85% 15% 1. actively producing fructose 1,6- bisphosphate 2. not producing fructose 1,6- bisphosphate 2/20/2012 2 Which site of phosphofructokinase has higher affinity for ATP? C a ta ly tic site R e g u la to ry sit. . 39% 61% 1. Catalytic site 2. Regulatory site Which is the oxidized form? N A D + N A D H 8% 92% 1. NAD + 2. NADH The process of fermentation results in R e d u c tio n o f N . . R e d u c tio n o f N . . O x id a tio n o f N . . O x id a tio n o f N . . 15% 67% 10% 8% 1. Reduction of NAD + 2. Reduction of NADH 3. Oxidation of NAD + 4. Oxidation of NADH Which aspect of protein structure would be most significantly affected by phosphorylation P rim a ry S e c o n d a ry T e rtia ry 8% 58% 33% 1. Primary 2. Secondary 3. Tertiary In the enzyme phosphofructokinase, the regulatory ATP site has a higher Km than the ATP catalytic site T ru e F a lse 1% 99% 1. True 2. False Hydrolysis of the phosphate from PEP provides sufficient energy to make ATP from ADP T ru e F a lse 0% 100% 1. True 2. False 2/20/2012 3 The same enzymes are used for gylcolysis and gluconeogenesis in all but three steps. T ru e F a lse 1% 99% 1. True 2. False In a FRAP experiment, the following results were seen. The two samples represented cells with different amounts of cholesterol, both at 37C. Which sample had more cholesterol? S a m p le # 1 S a m p le # 2 85% 15% 1. Sample #1 2. Sample #2 Which of the following is not amphipathic? T rig ly c e rid e P h o s p h o lip id D e te rg e n t S p h in g o lip id 72% 9% 16% 3% 1. Triglyceride 2. Phospholipid 3. Detergent 4. Sphingolipid Integral proteins have transmembrane helices which interact with the phosphilipids. Which of the following amino acids is likely to be in such helices Ly sin e Le u c in e G lu ta m in e A rg in in e 17% 3% 8% 72% 1. Lysine 2. Leucine 3. Glutamine 4. Arginine At 37C cholesterol reduces membrane fluidity T ru e F a lse 15% 85% 1. True 2. False Which if the following is not true of lipid rafts T h e y a re h ig h in c h o le ste ro l T h e y a re h ig h in sp h in g o l. . T h e y a re w id e r th a n th e . . T h e y a re d e te rg e n t in s o l. . A l o f th e a b o v e a re tru e 3% 2% 61% 22% 11% 1. They are high in cholesterol 1....
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PRS questions for second exam - 2/20/2012 1 A reaction can...

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