Which of the following is the result of the hydrolysis of 5'-CTAGTTC-3' at the b side?
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Which of the following is the result of the hydrolysis of 5'-CTAGTTC-3' at the b side?
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pCp, 3 Tp, Ap, Gp, C-OH
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pCp, 3 pT, pA, pG, pC-OH
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2 pC, 3 pT, pA, pG
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2pCp, 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? concerted O tetravalent phosphorous pentavalent phosphorous carbocationWhich 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 CH2OH
- In the elimination-addition mechanism for phosphate group transfer reactions, the intermediate would best be described as? carbocation concerted tetravalent phosphorous pentavalent phosphorousDraw the products formed when -D-idose is treated with C6H5NHNH2 (excess), H+Which of the following is an anomer of B-D-gulopyranose? O O го ОН H ОН H ОН H H ОН CH₂OH -II- H H ОН ОН CH2OH H ОН ОН CH2OH О 0. H CH2OH то Н H H ОН H H - о H ОН ОН H ОН H ОН ОН H О ОН ОН H N
- Dehalogenase 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 CH₂When a nonapeptide undergoes partial hydrolysis, it forms dipeptides, a tripeptide and two tetrapeptideswhose amino acid compositions are shown. Reaction of the intact nonapeptide with Edman’s reagentreleases PTH-Leu. What is the sequence of the nonapeptide?1. Pro, Ser 3. Met, Ala, Leu 5. Glu, Ser, Val, Pro 7. Met, Leu2. Gly, Glu 4. Gly, Ala 6. Glu, Pro, Gly 8. His, ValIn 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 CATAcid phosphatases are an important group of enzymes that can be detected in human blood serum. Under slightly acidic conditions (pH 5.0), this group of enzymes can hydrolyze biological phosphate esters as follows; R-O-P-O3-2+ H 20 OR-OH + HO-P-O3-2. Acid phosphatases are produced and can be detected in erythrocytes, kidney, spleen, the liver, and prostate gland. The enzyme from the prostate gland is clinically important because an increased activity in the blood is frequently an indication of cancer of the prostate gland. Tartrate ion can strongly inhibit the phosphatase from the prostate gland, but not acid phosphatases from other tissues. How can you use the information above to develop a specific procedure for measuring the activity of the acid phosphatase of the prostate gland in human blood serum?guanosine 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
