Question 2 Listen You have the following DNA sequence: 5'GGT ACG TTG GGG CTC CAT3' This sequence is transcribed and translated. If the G in Bold changes to a T, then the result will be ○ A) A nonsense mutation B) A frameshift mutation C) A silent substitution D) A missense mutation
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- QUESTION 22 Choose all the experiment(s) from the list below that demonstrated that RNA is involved in a transfer step between DNA and protein. O A. pulse chase experiments using radioactive deoxyribose O B. Brenner and Crick's characterization of frameshift suppressor mutations O C. analysis of the burst of RNA synthesis after bacteriophage infection of E. coli O D. pulse chase experiments using radioactive uracil bases O E. the Meselson Stahl experimentQuestion 19 A transversion mutation would be replacing T by: A either A or G BU (c) T D) cQuestion 47 (a) Use the following figure to determine the changes to the amino acids that correspond to the normal and mutated DNA sequences. Normal DNA sequence: 3 CAT TCA AAC ATT 5 Mutated DNA sequence: 3 CAT AGT GAG GTC 5 (Hint: Write the mRNA first, then identify the amino acids.) (b) What type of mutation is shown? First base of codon U C A G U UUU UUC UUA UUG CUU CUC CUA CUG AUU AUC AUA AUG GUU GUC GUA GUG UCU UCC UCA UCG CCU CCC CCA CCG ACU ACC ACA Met ACG GCU GCC GCA GCG Phe -Leu Leu lle Second base of codon A C Val -Ser Pro Thr Ala UAUTYT туг UAC UAA UAG CAU CAC CAA CAG. His Gin AAU AAC Asn AAA GAUT GAC GAA GAG Asp G AAGLYS AGG. GGU GGC GGA GGG Glu UGU UGC UGA UGG CGU CGC CGA CGG Bys A Trp G U C -Arg AGU AGC AGA аса за Ser Arg U C Gly AG A U C A G U C A G Third base of codon
- Question 45 Once the RNA primers are replaced the fragments in the lagging strands are sealed by DNA pol I. A True B) FalseQUESTION 19 A mutation inserts one nucleotide pair in the center of the open reading frame of a gene. Which of the following outcomes do you expect after translation of this gene's MRNA? O A. a protein in which one amino acid is changed O B. a protein in which three amino acids are changed O C. a protein in which most amino acids after the site of the insertion are changed O D. a protein in which two amino acids are changed O E. no protein at all QUESTION 20 An alpha helix is a: O A. secondary structure found in proteins. O B. right-handed twist found in double-stranded DNA. O C. globular structure found in proteins. O D. post-translational modification of certain proteins. O E. helical region found in functional tRNAs. QUESTION 21 The aminoacyl-tRNA synthetase enzymes are responsible for: O A. matching each TRNA with the appropriate mRNA codon. O B. catalyzing the enzymatic step of peptide bond formation during translation. O C. synthesizing TRNA molecules in the nucleus from tRNA…Question 15 Only eukaryotic transcription enzymes will synthesize small nuclear RNA molecules involved in the maturation and processing of other RNAS. (A) True B) False
- QUESTION NO. 1 A transition mutation A. occurs when a purine is substituted for a pyrimidine or vice versa. B. results from the insertion of one or two bases into the DNA chain. C. is most frequently caused by chemicals (like acridine) that intercalate into DNA. D. results from substitution of one purine for another or of one pyrimidine for another. E. always is a missense mutation QUESTION NO. 2 Degeneracy of the generic code denotes the existence of A. multiple codons for a single amino acid. B. codons consisting of only two bases. C. base triplets that do not code for any amino acid. D. different systems in which a given trip let codes for different amino acids. E. codons that include one or more of the unusual bases. QUESTION NO. 3 Replication A. requires that a phosphodiester bond of the incoming dNTP be hydrolyzed in order to be added to the growing chain. B. uses 5' to 3' polymerase activity to synthesize one…QUESTION 21 Choose each of the characteristic(s) of all RNA polymerases from the list below. A. elongation adds new ribonucleotides to the 3-OH B. requires a primer to initiate synthesis C. have 3' to 5' exonuclease activity D. adds nucleotides based on sequence complementarity to a template E. have 5' to 3' polymerase activity O F. elongation adds new ribonucleotides to the 2'-OH G. have 3' to 5' polymerase activityQuestion 17 What is the nucleotide sequence of the DNA strand that is complementary to 5-АTCGCAACTGTCAСТА-3 A 5-UAGUGACAGUUGCGAU-3' B 5'-TAGCGTTGACAGTGATA-3" с) 5-АТCАСTGTCААCGCTA-3 D 5'-TAGTGACAGTTGCGAT-3'
- Question 11 Species A and species B have the following nucleotide sequence at a locus that is not under selective pressure: Species A: ACCTAGCTCAGAGTCCGGATACTGATCAGA Species B: AGCTAGCTCCGATTCCGGATACCGATCAAA Previous sequencing efforts at this locus for closely related species revealed a mutation rate of about 0.068% per million years, and you decide to use this for your study. Given the formula D=ut where D=% sequence divergence, u=mutation rate, and t=time since divergence, how long ago did species A and species B diverge? A 2.45 mya 0.024 mya 1.48 mya D 245 mya E 13.2 mya Last saved 1:07:04 PM Pri Ter |曲 11 e Type here to search PrtScn Home F9Question 33 RNA polymerase IlI: A is located in the nucleoplasm and transcribes the protein-encoding genes through mRNAs. B transcribes tRNA genes and protein transport genes. c) transcribes the 55 RNA genes. D) transcribes RNA genes associated with TRNA processing.QUESTION 10 5' Capping and 3' polyadenylation of eukaryotic mRNA : a. Destabilize MRNA а. b. are required for translation initiation С. are needed for protein degradation d. are required for protein elongation