1 BMB 401 Practice Exam 4B Amino Acid 1 and 3 letter codes A Ala Alanine M C Cys Cysteine N D Asp Aspartate P E Glu Glutamate Q F Phe Phenylalanine R G Gly Glycine S H His Histidine T I Ile Isoleucine V K Lys Lysine W L Leu Leucine Y Met Asn Pro Gln Arg Ser Thr Val Trp Tyr Methionine Asparagine Proline Glutamine Arginine Serine Threonine Valine Tryptophan Tyrosine BMB 401 Practice Exam 4B 2 1 Sulfonamides are a class of antibiotic that inhibits translation in bacteria by preventing the formation of the initiation complex True False 2 Please choose the true statement a During replication the DNA leading strand is polymerized in the 5 to 3 direction but the lagging strand is polymerized in the 3 to 5 direction b During replication the DNA template is read in the 3 to 5 direction c During replication both strands of DNA are polymerized in the 3 to 5 direction d Both b and c are true e None of these statements is true 3 Please choose the true statement a PKU phenylketonuria results from a defect in the de novo synthesis of pyrimidines b Severe combined immunodeficiency results from a defect in tyrosine catabolism c Gout can result from a defect in the salvage pathway of purines d Huntingdon s disease results from a defect in the salvage pathway of purines e Both b and c are true f None of these statements is true 4 Please choose the true statement a The pyrimidines found in nucleic acid are guanine uracil and cytosine b The pyrimidines found in nucleic acid are uracil thymine and cytosine c The purines found in nucleic acid are guanine and cytosine d The purines found in nucleic acid are glycine and alanine 5 Please choose correct parings of enzyme and primary product a RNA Pol I mRNA RNA Pol II rRNA RNA Pol III tRNA b RNA Pol I rRNA RNA Pol II tRNA RNA Pol III mRNA c RNA Pol I rRNA RNA Pol II mRNA RNA Pol III tRNA d RNA Pol I tRNA RNA Pol II mRNA RNA Pol III rRNA e There are no correct statements 6 Which enzyme polymerizes the primer during replication in eukaryotes a Pol b Pol c Pol I d Pol III e Sigma factor 7 Which of the following intermediates can be used to make glucose in humans a Alanine b Lysine c Leucine d All the above are glucogenic amino acids 8 The CAC to CGC mutation is a point mutation called a transition mutation True False 9 Please select the true statement a The mRNA template is read in the 3 5 direction during translation b In bacteria and eukaryotes mRNA is synthesized in the 3 5 direction c The DNA template is read in the 3 5 direction during transcription d All the above are true e There are no true answers here 10 Lesch Nhyan syndrome is a fatal disease caused by an inability to break down branched chain amino acids True False BMB 401 Practice Exam 4B 3 11 Which intermediate is formed from the breakdown of argininosuccinate in the urea cycle and links the urea cycle with the TCA cycle a Succinyl CoA b Malate c Fumarate d Succinate 12 Please select the true statement a In the purine salvage pathway the enzyme HGPRT transfers hypoxanthine and cytosine to PRPP b Alcaptonuria is caused by overabundance of homogentisate which is released in the urine c The transamination of alanine with alpha ketoglutarate as an acceptor alpha ketoacid yields pyruvate and glutamate d All the above are true e Only b and c are true 13 Please choose the true statement a The basal transcription factors in E coli that are present at the initiation site of Pol II transcripts are TFIIA TFIIB TFIID TFIIE TFIIF and TFIIH b TFIID has the helicase and kinase activity necessary for promoter escape c The UP sequence is a bacterial DNA sequence found upstream of transcripts that are used frequently d Only b and c are true e There are no true statements here 14 Trans factors are proteins involved in the regulation of transcription whereas cis factors are DNA sequences involved in the regulation of transcription True False 15 Please choose the true statement Note inosinate is the same as inosine monophosphate and IMP a Inosine monophosphate is a nucleoside monophosphate with hypoxanthine for its base b Inosine monophosphate is an intermediate in the de novo synthesis of purines c In the synthesis of adenosine monophosphate ATP is used as a phosphate source d All the above are true e Only a and b are true f None of these statements is true 16 Each bacterial genome has one chromosome with one origin of replication while each eukaryotic genome has many chromosomes each of which has more than one origin of replication per chromosome True False 17 Please choose the FALSE statement a The conformation of Z DNA is a left handed helix and is generated largely by runs of alternating purines and pyrimidines b The conformation of B DNA is a right handed helix and is the most common DNA conformation c U1 U2 U4 U5 and U6 snRNPs are comprised of protein and RNA and are components of the splicing machinery d 5S RNA is a component of DNA polymerase alpha and is used for sequence recognition 18 In the de novo synthesis of pyrimidines orotate is formed before uridylate UMP True False 19 Please choose the true statement regarding Phenylketonuria a This condition is caused by an overabundance of active phenylalanine hydroxylase b This condition may be caused by a deficiency in the cofactor pyridoxal phosphate c This condition is a result of a defect in phenylalanine catabolism d Only b and c are true 20 During the de novo synthesis of purines bases are formed first then are attached to PRPP True False BMB 401 Practice Exam 4B 4 21 Which of the following is not an essential amino acid a Histidine b Leucine c Valine d Aspartate e These are all essential 22 Which intermediate is a metabolite that is correctly paired with its possible fate a Threonine Both Glucose and Ketone bodies b Lysine Glucose but NOT ketone bodies c Isoleucine Ketone bodies but NOT glucose d Tryptophan Both Glucose and Ketone bodies 23 Histone acetyl transferases increase accessibility of the DNA to transcriptional machinery by adding acetyl groups to histones True False 24 Which of the following could be bound to DNA to initiate transcription in prokaryotes a Lac repressor b TFIID c sigma factor d Rec A 25 Please choose the true statement regarding pyridoxal phosphate a This cofactor contains a reactive aldehyde b This cofactor makes a protonated Shiff base with amino groups c This cofactor is present and necessary in all aminotransferases d All the above are true e Only b and c are true 26 In mammalian systems nitrogen is fixed by the enzyme
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