Which of the following is the result of the hydrolysis of 5'-CTAGTTC-3' at the a side? 2 pC, 3 pT, pA, pG 2pCp, 3 pT, pA, pG, pC-OH pCp, 3 Tp, Ap, Gp, C-OH pCp, 3 pT, pA, pG, pC-OH
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Which of the following is the result of the hydrolysis of 5'-CTAGTTC-3' at the a side?
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2 pC, 3 pT, pA, pG
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2pCp, 3 pT, pA, pG, pC-OH
-
pCp, 3 Tp, Ap, Gp, C-OH
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pCp, 3 pT, pA, pG, pC-OH
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- Which of the following is/are a nucleophile(s) at pH 12? O guanidinium Ohydroxyl O thiol O amine O Both b and cIn the elimination-addition mechanism for phosphate group transfer reactions, the intermediate would best be described as? carbocation concerted tetravalent phosphorous pentavalent phosphorousguanosine and a water bind in the active site, does not matter in which order. The scissile N-1 glycosidic bond between the anomeric carbon and N9 of the base is broken resulting in an oxocarbenium transition state. The leaving group electrons are not protonated, but instead swing up to form a double bond between N9 and C8. The double bond that is already present on the purine swings out on N7 and is protonated by an active site histidine acting as a general acid. An active site aspartate acts as a general base, and deprotonates the water substrate molecule. The deprotonated water is then free to attack the transition state in a manner that will generate an αribose. Draw the active site and show how the mechanism works. You will need to draw 3 or 4 different active site “snap-shots” to show the entire process. Be sure to clearly show the transition state and how it might be stabilized
- Which of the following is incorrect about the chymotrypsin mechanism? a. The (-) charge of oxygen in the transition state is stabilized by the oxyanion hole Ob. Asp does not act as a nucleophile Oc. After H₂O had a proton removed, the OH acts as a nucleophile Od. When His removes a proton from H₂O, it is acting as an acidWhich of the following is an aldo-tetrose ? * НО H НО Н OH Н OH OH CH2OH (a) (d) H Н НО H A B D OE н -ОН -ОН CH₂OH c=0 н -OH CH₂OH (b) (e) н НО НО H- CH₂OH c=0 -H H OH CH₂OH (c) H Н CH₂OH Т c=0 OH OH CH2OHIn the biosynthesis of heme, ring cyclization, isomerization, and decarboxylation reactions take place. Identify the potential intermediates and show the electron flow in the following diagram. HO,C R1 HO2C- -R2 NH HN- но- NH HN- HO2C R R2 unstable intermediate Uro'gen II HO2C Me Me NH HN- -CO2H HN NH Me Me HO2C CO2H Coproporphyrinogen II
- Which of the following statements is correct regarding the structures below? CHO CHO CHO -Н НО H НО н- ОН -Н - ОН CH2OH CAB All are structures of D-sugars. All are structures of ketohexoses. Only CAR is a monosaccharide. O Only CAP is a L-sugar. -ОН -ОН H-OH H-OH H- ОН CH₂OH CAR но-н H-OH н НО т н-он CH₂OH CAP CH₂OH Fo НО-Н H НО-Н H он CH₂OH CATDehalogenase enzymes catalyze the clevage of C-X bonds. One such dehalogenase catalyzes the following reaction. An active site aspartate is thought to carry out the initial nucleophilic attack that expels the chloride. Select the most likely intermediate in the reaction. (Note the stereochemistry. Refer to P11.19 in the textbook if needed.) O O A C D OE -CH₂ H H₂C™ CO₂ H B CO₂ CI N H₂O Cr CO₂ H CO₂ нотум CH3 D CO₂ five N E CH₂Which of the compounds shown below exhibit a high negative free energy of hydrolysis equal to or larger than the free energy of hydrolysis for the phosphoanhydride of ATP? (Choose all that apply) В Α HPΗ Ho HO HO H2N-CH-C CH2 H2N-CH-C CH2 CH2 H2N-CH-Ö CH2 C CH2 D E O A O B O E O=p-00 O=p-00 O=-00 O=0-00 O=L-00
- Use arrow-pushing to show how the glycerol phosphate reacts with the base :B and NAD* to form DHAP. Show the products of the reaction, including the structure of DHAP. The image can be selected for copying and pasting. :B O-H 2. HO-CH-C-CH-O-Pi H H H NAD*The following is the chemical structure of nicotinamide adenine dinucleotides, a coenzyme commonly used in enzymatic reactions. Но 4 HO 0-P-0 *Na "O. `NH2 N 1 "OH H2N OH Which of the indicate regions is the site of the redox activity of this coenzyme? 2.What kind of catalysis is cysteine driving in this picture? S Los i fy R……—NHR N-H---S O. N-H H-N H-N. O Metal catalysis Covalent catalysis Base catalysis O Acid catalysis NHR²
