CH369 finalexams03

CH369 finalexams03 - 1 Conversion of ornithine to...

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1. Conversion of ornithine to citrulline is a step in the synthesis of: A) tyrosine B) aspartate C) pyruvate D) carnitine E) urea 2. Almost all of the oxygen (O 2 ) one consumes in breathing is converted to: A) carbon dioxide (CO 2 ) B) carbon monoxide and then to carbon dioxide C) water D) acetyl-CoA E) none of the above 3. All of the following enzymes involved in the flow of carbon from glucose to lactate (glycolysis) are also involved in the reversal of this flow (gluconeogenesis) except : A) phosphoglucoisomerase B) phosphofructokinase-1 C) enolase D) 3-phosphoglycerate kinase E) aldolase 4. The compound that condenses with CO 2 in the first reaction of carbon dioxide assimilation is: A) ribose 1,5-bisphosphate B) ribulose 1,5-bisphosphate C) ribulose 5-phosphate D) 3-phosphoglycerate E) rubisco 5. The assimilation of CO 2 into organic compounds (triose phosphates) in green plants: A) takes place in the cytosol B) results in the production of ATP C) involves condensation of the two-carbon compound acetate with CO 2 to form 3-phosphoglycerate D) requires NADPH E) takes place at equal rates in light and darkness 6. Which of the following is not true of the reaction in which malonyl-CoA is produced during fatty acid synthesis? A) It requires CO 2 (or bicarbonate). B) The cofactor is biotin. C) It requires acyl carrier protein (ACP). D) It is stimulated by citrate.
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7. The Cori cycle is: A) the interconversion between glycogen and glucose 1-phosphate. B) the synthesis of alanine from pyruvate in skeletal muscle and the synthesis of pyruvate from alanine in liver. C) the synthesis of urea in liver and degradation of urea to carbon dioxide and ammonia by bacterial in the gut. D) the production of lactate from glucose in peripheral tissues with the resynthesis of glucose from lactate in liver. E) none of the above. 8. An Ozaki fragment is a: A) small segment of DNA that is an intermediate in the synthesis of the lagging strand. B) fragment of RNA that is a subunit of the 30S ribosome. C) segment of mRNA synthesized by RNA polymerase. D) piece of DNA that is synthesized in the 3’ 5’ direction. E) fragment of DNA resulting from endonuclease action. 9. RNA polymerase: A) separates DNA strands throughout a long region of DNA (up to thousands of base pairs), then copies one of them. B) has a subunit called λ (lambda), which acts as a proofreading ribonuclease. C) binds tightly to a region of DNA thousands of base pairs away from the DNA to be transcribed. D) can synthesize RNA de novo (without a primer). 10. The mRNA for a polypeptide chain of molecular weight 50,000 has a minimum length of: (Assume that the average amino acid residue contributes 110 to the peptide molecular weight.) A) 133 nucleotides B) 460 nucleotides C) 1,400 nucleotides D) 5,000 nucleotides E) It is impossible to determine from the data given. 11. Which of the following statements about tRNA molecules is
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CH369 finalexams03 - 1 Conversion of ornithine to...

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