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Published	01/14/2024	A newly isolated enzyme was being studied for its kinetic properties. When a substrate is bound to the enzyme, a significant conformational chan…
Published	01/14/2024	A person is born with a mutation that causes their cells to not have the ability to produce the NADH dehydrogenase complex, the complex that allows th…
Published	01/14/2024	What is the effect of increased levels of hydrogen ions in the intermembrane space of the mitochondria?A. Decreased levels of chemiosmosis B. Increase…
Published	01/14/2024	What phase of cellular respiration has the highest ATP yield?A. Chemiosmosis B. Substrate level phosphorylationC. Glycolysis D. Krebs cycle
Published	01/14/2024	When glucose is converted to lactate by anaerobic glycolysis, __ ATPs are formed. When glucose is completely oxidized to CO2 and water, the equi…
Published	01/14/2024	Which of the following is true regarding the relative energy state by which FADH2 and NADH enter the electron transport chain?A. NADH enters the…
Published	01/14/2024	During oxidative phosphorylation, the proton motive force generated by electron transport is used to
Published	01/14/2024	During oxidative phosphorylation, the proton motive force generated by electron transport is used toA. induce a conformational change in the ATP synth…
Published	01/14/2024	Which of the following compounds transiently binds the substrate or enzyme in an enzyme-catalyzed reaction?A. Prosthetic group B. Coenzyme C. Pr…
Published	01/14/2024	Which of the following is true of the α-ketoglutarate dehydrogenase complex?A. It is membrane-bound B. It is an isoenzyme of pyruvate dehydrogen…
Published	01/14/2024	Why is oxygen necessary in aerobic cellular respiration?A. It provides hydrogen nuclei needed to create a proton gradient in the intermembrane spaceB.…
Published	01/14/2024	Enzymes having slightly different molecular structures or physiologic properties but performing identical activity areA. isoenzymes B. isomers C…
Published	01/14/2024	What would occur if all available hydrogen ions were used by ATP synthase?A. It would increase the levels of inorganic phosphate in the mitochon…
Published	01/14/2024	Which of the following enzymes of the tricarboxylic cycle is membrane-bound?A. Isocitrate dehydrogenase B. Succinate thiokinase C. β-ketoglutarate deh…
Published	01/14/2024	What powers the ATP synthase rotary motor?A. Electron transport B. Reduction of oxygen C. H+ gradient D. Hydrolysis of ATP
Published	01/14/2024	Malonate is an inhibitor in which stage of the extraction of energy from food?A. I B. II C. III D. IV
Published	01/14/2024	Enzyme X in a normal saline solution containing molybdenum catalyzed the formation of product P from substrate S at a rate of 90 U/min. The same enzym…
Published	01/14/2024	Which of the following vitamins is/are essential in the Krebs cycle?A. Thiamine B. Pantothenic acid C. Nicotinamide D. All of the above
Published	01/14/2024	The released energy obtained by oxidation of glucose is stored asA. a concentration gradient across a membrane B. NAD+ C. ADP D. ATP
Published	01/14/2024	Substrate level phosphorylation in the Krebs cycle occurs after the reaction catalyzed by a/anA. ligase B. isomerase C. oxidoreductase D. lyase&…
Published	01/14/2024	Phosphoglycerate kinase functions in carbohydrate metabolism to produce byA. oxidative phosphorylation B. phosphorolysis C. substrate level phosphoryl…
Published	01/14/2024	Which of the following groups of enzymes is present in the glycolytic pathway but not in the tricarboxylic cycle?A. IsomeraseB. Oxidoreductase C…
Published	01/14/2024	Which vitamin deficiency will most likely affect activity of pyruvate dehydrogenase?A. Folic acid B. Pyridoxine C. Pantothenic acid D. Thiamine
Published	01/14/2024	In which part of the cell does conversion of pyruvate to acetyl-CoA occur?A. Mitochondrial matrix B. Mitochondrial intermembrane space C. Inner …
Published	01/14/2024	A patient suffering from arsenic poisoning is expected to accumulate which of the following substrates of the Krebs cycle?A. Citrate B. α-Ketoglutarat…
Published	01/14/2024	Which of the following enzymes catalyze a physiologically irreversible reaction in the glycolytic pathway?A. Phosphoglycerate kinaseB. Glycerald…
Published	01/14/2024	Which of the following will occur if an organism lacks phosphotriose isomerase?A. 1 NADH is produced at the end of anaerobic glycolysis B. 2 ATPs will…
Published	01/14/2024	If electron transfer in tightly coupled mitochondria is blocked (with antimycin A) between cytochrome b and cytochrome c1, thenA. all ATP synthesis wi…
Published	01/14/2024	Which of the following enzymes allows cells to survive anoxic episodes?A. Lactate dehydrogenaseB. Pyruvate kinase C. Hexokinase D. Aldolase
Published	01/14/2024	The Watson-Crick model of DNA is typified byA. a smaller number of purines than pyrimidines B. 12-base pair per helical turn C. bases located in the i…
Published	01/14/2024	In the lagging strand, the gaps between Okazaki fragments are filled by the action ofA. ligase B. DNA polymerase alpha C. DNA polymerase beta D. DNA p…
Published	01/14/2024	Which enzyme catalyzes the synthesis of DNA that is complementary to viral RNA?A. DNA-directed DNA polymerase B. DNA-directed RNA polymerase C. RNA-di…
Published	01/14/2024	What is the role of small nuclear RNAs in protein synthesis?A. Translates the genetic code to a specific amino acid B. Provides the genetic blueprint …
Published	01/14/2024	This prevents aminoacyl-tRNA from binding amino acid to tRNAA. Tetracycline B. Puromycin C. Rifampicin D. Chloramphenicol
Published	01/14/2024	The immediate product of gene transcriptionA. mRNA B. SNURPS C. ssRNA D. Primary transcript
Published	01/14/2024	The antimetabolite, 5-FU inhibits DNA replication by which mechanism?A. Intercalates into the DNAB. Cross-links adjacent guanine residues in the DNA C…
Published	01/14/2024	Which of the following is NOT true of operator region of Lac Operon?A. Lies adjacent to lactose repressor gene B. Can block transcription C. Repressor…
Published	01/14/2024	Which post-translational modifications are needed to protect the native conformation of the proteins from denaturation?A. Carboxylation B. Methylation…
Published	01/14/2024	During RNA synthesis, DNA template sequence 5’-TpApGpCp-3’ would be transcribed to produce which of the following sequences?A. 3’-GpCpTpAp-5’ B.…
Published	01/14/2024	Which of the following is incorrect regarding double helical DNA?A. Molar amounts of A + T = molar amounts of G + C B. Separation of strands require u…
Published	01/14/2024	Which eukaryotic DNA polymerase is responsible for synthesis of lagging strand?A. Delta B. Gamma C. Beta D. Alpha
Published	01/14/2024	Guanine-cytosine base pairs in DNA molecule are more stable to denaturation than adenine-thymine pairs becauseA. the phosphodiester bonds among G-C pa…
Published	01/14/2024	Which of the following promoters is important in eukaryotic initiation of transcription?A. CAAT box B. Pribnow box C. Hogness box D. Hageman box
Published	01/14/2024	Which posttranscriptional processing is used as a recognition signal for ribosome to bind to mRNA?A. Methylguanosine triPO4 B. Poly A tail C. Ad…
Published	01/14/2024	In the operon, inducer functions in the regulation of gene expression byA. altering the conformation of repressor protein B. binding to the oper…
Published	01/14/2024	What is the mechanism responsible for xeroderma pigmentosum?A. Mutation of endonuclease B. Oxidative free radical formation C. Formation of thym…
Published	01/14/2024	Which of the following reactions does RNA-directed DNA polymerase catalyze?A. Removal of wrong nucleoside inserted during DNA synthesis B. Synthesis …
Published	01/14/2024	Which of these constitute the second level of organization of DNA?A. Chromosome B. Condensed metaphase chromosome C. Nucleosome D. Double helix …
Published	01/14/2024	Which phase of protein synthesis does the release of newly synthesized polypeptide from the ribosome takes place?A. Initiation B. Termination C.…
Published	01/14/2024	A promoter site on DNA functions in which of the following?A. Initiates transcription B. Binds transcription factors C. Transcribes repressor D. Codes…
Published	01/14/2024	Which enzyme is capable of proofreading and correcting errors during translation?A. 3’ exonuclease B. Polymerase C. Aminoacyl tRNA synthaseD. 5’…
Published	01/14/2024	This best describes the Okazaki fragmentA. Fragments of DNA which are eventually joined to form continuous DNAB. Synthesized from 5’ to 3’ and p…
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