All of the following is correct about folate and vitamin B12 involvement in resynthesis of methionine from homocysteine except: Cobalamin acts as a methyl donor by giving the methyl group to 5-methyl THF Methylcobalamin give a methyl group to homocysteine to form methionine and reform cobalamin 5, 10-methylene THF is converted to 5-methyl THF by methylene THF reductase The involvement of folate and vitamin B12occurs in the cytosol.
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All of the following is correct about folate and vitamin B12 involvement in resynthesis of methionine from homocysteine except:
- Cobalamin acts as a methyl donor by giving the methyl group to 5-methyl THF
- Methylcobalamin give a methyl group to homocysteine to form methionine and reform cobalamin
- 5, 10-methylene THF is converted to 5-methyl THF by methylene THF reductase
- The involvement of folate and vitamin B12occurs in the cytosol.
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- Which cytochrome P450-catalyzed reaction is shown below? R-CH2NH2 [R-CH=NH] Oxidation of aromatic amines Oxidative deamination Oxidative O-dealkylation Oxidative N-dealkylation para-hydroxylation R-CHO + NH3One of the steps in psilocybin biosynthesis is the phosphorylation of 4-hydroxytryptamine By the enzyme Psik as shown below, that involves the hydrolysis of ATP. NH₂ OH HO Psik HO of A& ADP 4-hydroxytryptamine ATP norbaeocystin The standard free energy changes for each reaction is shown in the Table below. J reaction 4-hydroxytryptamine + P₁ → norbaeocystin ATP → ADP+ Pi (b) What is the equilibrium constant at 37 °C? AG 27.7 kJ/mol -32.2 kJ/mol (a) Write the net reaction. What is the standard free energy change for the net reaction? (c) In the cell, the concentration of ATP is 3.1 mM, the concentration of P; Is 5.90 mM, and the Concentration of ADP is 220 μM. What will AG Be if the concentration of norbaeocystin Is always kept at 1/100 of the concentration of 4-hydroxytryptamine?Transamination reactions typically involve which of the following (select all that apply)? O almidine linkage/Schiff base O biotin O alpha-keto acid O pyridoxal phosphate zymogens O glutamate dehydrogenase
- Match each of the enzymes involved in de novo pyrimidine synthesis with the correct description: _______ Dihydroorotate dehydrogenase _______ UMP synthase_______ Carbamoyl phosphate synthetase II _______ TMP synthase _______ CTP synthetase_______ Aspartate transcarbamoylase _______ PRPP synthetase (A) attaches an aspartate to an activated carbamoyl molecule(B) bifunctional enzyme that combines a nitrogenase pyrimidine ring to an activated ribose(C) catalyzes the formation of the activated ribose sugar(D) uses glutamine to add an amine to a preformed nucleotide(E) produces the first cyclic nitrogenase ring during de novo pyrimidine synthesis(F) combines bicarbonate and nitrogen from glutamine in the first step of pyrimidine ring synthesis (G) uses a folate derivative to add a methyl group to a preformed nucleotideIn this step of purine biosynthesis, which functional group gets activated by ATP Pribose NH, ATP Carboxyaminolmidazole ribonedeotide Asp AD Fumarate Pribose NH, S-Aminolmidazole- 4(N-succinylcarboxamide) ribonucleotide O Carboxyaminoimidazole ribonucleotide COOH O Carboxyaminoimidazole ribonucleotide NH2 O Asp side chain COOH O Asp main chain NH2 O Asp main chain COOHWhich of the following statements is not true about the catalytic triad in chymotrypsin? Group of answer choices the side chain of the serine 195 is hydrogen bonded to the imidazole ring of histidine the -NH group of the imidazole ring of histidine is hydrogen bonded to the carboxylate group of aspartate 102 the histidine residue serves to position the aspartate 102 side chain and to polarize its carboxylate group so that it is poised for deprotonation histidine acts as a general base catalyst none of these
- For each of the following descriptions, match the corresponding enzyme: Utilizes a ATP for formation of carboxy biotin Utilizes a Schiff's base for the stabilization of a carbanion Utilizes TPP for the stabilization of a carbanion Facilitates a hydration reaction Enzymes: Enalose phosphoglucoisomerase phosphoenolpyruvate carboxykinase pyruvate carboxylase transketolase transaldoasePsilocybin is a hallucinogenic compound found in some mushrooms. Present a straightforward pathway for its biosynthesis from one of the aromatic amino acids.Which of the following are required for serine biosynthesis (select all that apply)? O NADP+ O 3-phophogylcerate O PLP pyruvate O glutamate O PEP
- Which of the following statement is CORRECT? O Hydrolysis of starch into glucose in an elimination reaction Group transfer reaction is a nucleophilic substitution reaction Conversion of 3-phosphoglycerate to 2-phosphoglycerate is a group transfer reaction Most biochemical reaction occurs via homolytic cleavage Electrophiles are electron-rich, while nucleophiles are electron-deficientDescribe each step of the metabolic pathway shown in the image below. Linoleic Acid Metabolism 18:2n-6, HO. Linoleic Acid 18:3n-6 он Gamma Linolenic Acid 20:3n-6 он Dihomo Gamma Linolenic Acid 20:4n-6 HO, Arachidonic Acid 22:4n-6 но, Docosatetraenoic AcidAll of the following products of biosynthesis are nitrogen-rich tetrapyrrole structures that can be synthesized from Krebs cycle intermediates (in some plants, animals, or bacteria), with the exception of: triglyceride molecules chlorophyll b molecules vitamin B12 molecules chlorophyll a molecules heme molecules Identify the Krebs cycle enzyme that consumes a six-carbon substrate molecule, producing a five-carbon product molecule along with NADH, and one molecule of CO2. succinyl CoA synthetase a-ketoglutarate dehydrogenase malate dehydrogenase isocitrate dehydrogenase citrate synthase