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Published	01/14/2024	Which of the following groups of enzymes is present in the TCA but not in the glycolytic pathways? Oxidoreductase Lyase Ligase NOTA
Published	01/14/2024	Which of the following conditions leads to maximal expression of the lac operon? lactose absent, glucose present lactose present, glucose present lact…
Published	01/14/2024	Which of the following types of RNA is known for its catalytic abilities? A. dsRNA B. tRNA C. mRNA D. rRNA
Published	01/14/2024	Which of the following groups of enzymes is present in the glycolytic pathway but not in the TCA cycle? A. LyaseB. TransferaseC. OxidoreductaseD. Liga…
Published	01/14/2024	Which of the following contributes nitrogen atoms to both purine and pyrimidine rings? A. Carbamoyl phosphate B. Carbon dioxide C. Aspartate D. Glutam…
Published	01/14/2024	Which of the following is FALSE? A.The rate of purine and pyrimidine synthesis is controlled by the intracellular concentration of PRPP B. Both puri…
Published	01/14/2024	3 amino acids that donate amine groups for the purine synthesis A.Glycine, Glutamine, Aspartate B. Glycine, Lysine, Asparagine C.Glycine, Alanine, Asp…
Published	01/14/2024	These are features of Methotrexate, EXCEPT: A. inhibiting thymidylate synthase B. inhibits DNA synthesis and cell growth C. prevents methylation of dU…
Published	01/14/2024	Which of the following is the correct order of the following steps in protein synthesis?1. A peptide bond is formed 2. The small ribosomal subunit is …
Published	01/14/2024	What is meant by degenerate code? A. One code can control more than one amino acidB. One amino acid is coded by one code C. One amino acid can be code…
Published	01/14/2024	What sequence on the template strand of DNA corresponds to the first amino acid inserted into a protein?A. TAC B. UAA C. AUG D. UAG
Published	01/14/2024	An operon of genes encoding enzymes in a biosynthetic pathway is likely to be: A. inducible B. repressible C. monocistronic D. constitutive
Published	01/14/2024	Thioredoxin reductase is involved in the A. conversion of dUMP to dTMP B. conversion of AMP to ATP C.conversion of ribonucleotide to a deoxyribo…
Published	01/14/2024	A cell that relies solely on the malate shuttle to conduct reducing equivalents through the mitochondrial membrane will produce ___ ATPs (net) after c…
Published	01/14/2024	Which of the following is NOT a function of the 5’ cap and 3’ poly-A tail of a mature eukaryotic mRNA molecule?A.Facilitate splicing B. Aid ribosome b…
Published	01/14/2024	Which of the following statements is TRUE? A. Orotidine 5-monophosphate (OMP) is the first pyrimidine ringB.Aspartate donate N in both purine and&nbsp…
Published	01/14/2024	When the ribosome reaches a nonsense codon, which of the following occurs? A. The polypeptide is released B. The A side binds to a charged tRNA C. A m…
Published	01/14/2024	Which of the following vitamins are essential in Glycolysis? A. Nicotinamide B. All options are needed in glycolysis C. Thiamine D. Pantothenic acid
Published	01/14/2024	Which of the following vitamins are required for a-ketoglutarate dehydrogenase activity? A. riboflavin B. all of the options are needed for aketogluta…
Published	01/14/2024	Which of the stages in the extraction of energy from food will be most likely affected by arsenic and its derivatives?A. I and II B. III and IV C. II …
Published	01/14/2024	A 44-year-old woman presents to the ER because of fever, chills, and severe right flank pain. The patient states that she feels a burning sensation wh…
Published	01/14/2024	During denaturation of DNA, which of the following happens? A. Hydrogen bonds between complementary bases breakB. Phosphodiester bonds between co…
Published	01/14/2024	A 40-year-old man is being treated for a bacterial infection with an antibiotic, an RNA polymerase inhibitor. Which of the following best describes it…
Published	01/14/2024	Which one of the following enzymes of purine biosynthesis is inhibited by 6-Mercaptopurine? A. Adenylsuccinase B. GMP synthetase C.Adenyl succinate sy…
Published	01/14/2024	Which of the following components is involved in the inhibition of transcription? A. start codon B. origin C. primer D. promoter
Published	01/14/2024	The activity of which of the following enzymes is inhibited by the chemotherapeutic agent during deoxyribonucleotide synthesis?A. Thymidylate synthase…
Published	01/14/2024	The only substrate level phosphorylation reaction in the Krebs cycle forms the for a /an: A. ligase B. oxidoreductase C. lyase D. transferase
Published	01/14/2024	Which of the following is a change in the sequence that leads to formation of a stop codon? A. Silent mutation B. Missense mutation C. Nonsense mutati…
Published	01/14/2024	DNA replication in eukaryotes is characterized by the following, EXCEPT: A. Occurs during the S phase B. Occurs before mitosis and meiosis C. Involve…
Published	01/14/2024	Which pyrimidine base contains an amino group at carbon 4? A. Adenine B. Thymine C. Cytosine D. Uracil
Published	01/14/2024	The major control of de novo pyrimidine nucleotide synthesis is A. feedback inhibition of aspartate transcarbamoylaseB.competitive inhibition of carba…
Published	01/14/2024	Mutations in a particular step of the DNA replication can lead to genetic diseases and cancer. Proofreading is important to prevent the transfer of mu…
Published	01/14/2024	This best characterize the rate-limiting enzyme in de novo purine synthesis A. controlled primarily by substrate availability B. requires AMP for acti…
Published	01/14/2024	A human cell was subjected to a solution containing fluorocitrate. Formation of which metabolites will most likely be affected?A. a-ketoglutarate, 3-p…
Published	01/14/2024	The protein of an enzyme is called: A. coenzyme B. apoenzyme C. proenzyme D. isoenzyme
Published	01/14/2024	Which of the following is TRUE of the succinate dehydrogenase complex? A. It is an isoenzyme of pyruvate dehydrogenase since they have similar require…
Published	01/14/2024	Feedback inhibition of pyrimidine nucleotide synthesis can occur by A. CTP allosteric effects B. Increased activity of Aspartate transcarbamoylaseC. I…
Published	01/14/2024	Which of the following enzymes of the TCA has similar complexity with pyruvate dehydrogenase? A. a-ketoglutarate dehydrogenase B. succinate thiokinase…
Published	01/14/2024	Conversion of dUMP to TMP is catalyzed by the enzyme A. Ribonucleotide reductase B. Orotidylic acid decarboxylase C.CTP synthetase D.Thymidylate synt…
Published	01/14/2024	What powers the ATP synthase rotary motor? A.Electron transport B. Hydrolysis of ATP C.Reduction of oxygen D.H+ gradient
Published	01/14/2024	Which of the following serves as recyclable shuttles in enzyme-catalyzed reactions? A. coenzyme B. prosthetic group C. apoenzyme D. cofactor
Published	01/14/2024	PRPP glutamyl amidotransferase, the 1st enzyme committed to purine synthesis is feedback-inhibited by the following, EXCEPT:A. GMP B. AMP C. IMP D. XM…
Published	01/14/2024	The carbon atoms at position 4 & 5 and the N atom at position 7 of the purine base are supplied from A.Glycine B. Valine C.Serine D.Alanine
Published	01/14/2024	A mutation resulted in a non-functioning glycerophosphate shuttle. The cell that contains this mutation will generate how many moles of ATP for every …
Published	01/14/2024	A child is found to have severe combined immunodeficiency. The enzyme that is defective in this disorder is important in which of the following proces…
Published	01/14/2024	Allopurinol has no effect on the very high blood uric acid level of patients with Lesch-Nyhan syndrome because it does NOTA. decreases de novo purine …
Published	01/14/2024	Important enzyme in the purine salvage pathway A. phosphoribosyl transferase B. phosphoamido transferase C. amido transferase D. ribosyl transferase
Published	01/14/2024	Which of the following enzymes is required during the Stage II of the conversion of food to hight energy phosphates?A. FAD dehydrogenase B. Hydrolases…
Published	01/14/2024	In tissues that do not carry out active de novo synthesis, maintenance of an adequate supply of adenine nucleotidesA. occurs primarily by adenine salv…
Published	01/14/2024	Arrange in the correct order of their use the following enzymes that are involved in the catabolism of AMP to uric acid. 1. nucleotidase 2. xanthine …
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