Short questions 4. a. A polypeptide contains 36 amino acids. How many nucleotides should be found in the openreading frame? How many codons arerequired to produce this polypeptide?b. RNAS play critical roles in various processes in translation. Name the RNA in small subunit ofribosome in E. coli and briefly describe its critical function.

Codons are triplets of nucleotides, which codes for specific amino acids. The open reading frame is…

Answered: 4. a. A polypeptide contains 36 amino…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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1. Translation a)Explain the role of ribosomes in the process of protein translation.b. Explain the role of tRNA molecules in protein translation.c. Define the following terms:1. codon 2. anticodon. Explain how a codon is used in the process of translation.
8. The following diagram illustrates a step in the process of translation. fMet Pro mRNA UAC GGG AUGCCCACG UAG a) Identify the following elements on the diagram. Aminoacyl site (A) Peptidyl site (P) Exit site (E) Amino end of the newly synthesized polypeptide chain Carboxyl end of the newly synthesized polypeptide chain Approximate location of the next peptide bond that will be formed
25. A portion of an mRNA attached to a ribosome reads: 5′ GACAUGAACAGC 3′ If a tRNA with a methionine amino acid attached is in the P site of the ribosome, a tRNA with which amino acid attached will enter the A site? Group of answer choices 1. Asparagine 2. Lysine 3. Threonine 4. Glutamic Acid
3b) In the real world, where "wobble" pairing is possible, what is the minimum number of tRNAs required to service all of the threonine codons? Write out the base sequences of the anticodons of those tRNAs (remember to label the 5' and 3' end of each anticodon sequence).
28. a. Can a tRNA exist that has the anticodon sequence 5' IAA? If so, which amino acid would it carry? b. Answer the same question for the anticodon sequence 5' xm5s²UAA.
c) A gene in a bacteria has the following DNA sequences (the promoter sequence is positioned to the left but is not shown): 5'-CAATCATGGAATGCCATGCTTCATATGAATAGTTGACAT-3' 3'-GTTAGTACCT TACGGTACGAAGTATACTTATCAACTGTA-5' i) By referring to the codon table below, write the corresponding mRNA transcript and polypeptide translated from this DNA strand. 2 Second letter с A UUUPhe UAU Tyr UAC. UGU UGCJ UCU) UCC UCA UUG Leu UCG Cys UUC UUA Ser UAA Stop UGA Stop A UAG Stop UGG Trp G CUU CÚC CCU ССС CAU CGU His САC Pro CC CỦA Leu ССА CAA Arg CGA CUG J CCG) CAG Gin CGG AUU ACU AAU Asn AGU Ser AUC le АСC АCА AAC AAA AGC. Thr JArg AUA AGA AUG Met ACG AAG Lys AGG. GAU Asp GUU) GCU GCC GCA GCG GGU" GGC GGA GGG GUC Val GUA GAC Ala Gly GAA Glu GAGJ GUG ii) If the nucleotide indicated by the highlighted bold letter undergoes a mutation that resulted in deletion of the C:G base pair, what will be the resulting amino acid sequence following transcription and translation? Third letter DUAG DUAG DUAG A. First…
2a) Suppose you have a gene in which a single base substitution has created the nonsense mutation 5'TAA3' (which will be transcribed into 5'UAA3' in the mRNA - but recall that mutations are changes in the DNA sequence). Name all the amino acids that could have been coded for by the original, unmutated codon at that position in the gene.
1. A portion of the template strand of a DNA molecule that codes for the 5'-end of an mRNA has the following nucleotide sequence. Give the primary structure of the polypeptide (use 3-letter amino acid codes), beginning with the most common translation initiation codon, that will be specified by this portion of the gene. Be sure to label the ends of the polypeptide. 3'-TTTTACGGGAATTAGAGTCGCAGGATG-5'
16. Consider the following original coding sequence of a gene that codes for a short 3-amino acid polypeptide: 5'-ATGTGGTCATGA-3' Using the genetic code and the amino acid table below, which of the following sequences arises from a non-conservative missense mutation in the original sequence shown above? First base in codon U C A G UUU UUC- UUA UUG- H₂N+ H H₂N-C- Phe (F) CUU- CCU CUC CCC CUA CCA CUG- CCG AUU ACU AUC Ile (1) ACC AUA ACA AUG Met (M) start ACG- GUU GCU GUC GCC GUA GCA GUG- GCG Nonpolar side chains; hydrophobic Leu (L) U Side chain (R group) OH CH₂ Leu (L) H₂N-C Val (V) HO Glycine (Gly or G) CH3 S CH₂ CH₂ Polar side chains; hydrophilic H O Methionine (Met or M) 0 H₂N-C Second base in codon UCU UCC UCA UCG OH CH, CH HO Aspartic acid (Asp or D) HO Alanine (Ala or A) 0 H O Serine (Ser or S) HO Threonine (Thr or T) Electrically charged side chains; hydrophilic CH3 H₂N-C-C-0- Acidic (negatively charged) CH₂ H₂N+ C CH₂ CH₂ H₂N-C-C-0- H₂N-C- C CH₂ Ser (S) Pro (P) Thr (T) H O…
16. Consider the following original coding sequence of a gene that codes for a short 3-amino acid polypeptide: 5'-ATGTGGTCATGA-3' Using the genetic code and the amino acid table below, which of the following sequences arises from a non-conservative missense mutation in the original sequence shown above? First base in codon U A UUU UUC- UUA UUG- CUU CUC CUA CUG- AUU- ACU AUC Ile (1) ACC AUA- ACA AUG Met (M) start ACG GUU GCU GUC GCC GUA GCA GUG- GCG H₂N- U Phe (F) Leu (L) Leu (L) Nonpolar side chains; hydrophobic Val (V) Side chain (R group) H H₂N-C-C-0- HO Glycine (Gly or G) CH₂ H₂N*- CH₂ CH₂ H O Methionine (Met or M) Polar side chains; hydrophilic 0 CH₂ Second base in codon H O Aspartic acid (Asp or D) UCU UCC UCA UCG CCU CCC CCA CCG Alanine (Ala or A) OH CH₂ H₂N-C C 0 H₂N-C C 0 H O Serine (Ser or S) H O Threonine (Thr or T) Electrically charged side chains; hydrophilic OH CH3 CH -0- H₂N+- Acidic (negatively charged) CH₂ H₂N-C-C-O HO C Ser (S) Pro (P) CH₂ CH₂ Thr (T) CH₂ H₂N-C Ala (A)…
20. TRNA stands for transfer RNA, since a tRNA molecule transfers an amino acid to the growing protein molecule. You could also think of tRNA as translation RNA. Explain how tRNA molecules help the ribosome to translate the sequence.of nucleotides in mRNA to i sequence of amino acids in a protein. To see the process of translation in action, watch "Translation" at https://www.biointeractive.org/classroom-resources/translation-basic-detail. 21a. Fill in the blanks to label each type of molecule in this figure. a.tRNA $ & 7 8 9.
28. a. Can a tRNA exist that has the anticodon sequence 5' IAA? If so, which amino acid would it carry? b. Answer the same question for the anticodon sequence 5' xm³s²UAA. 29. For parts (a) and (b) of Problem 28, consider the DNA sequences of the genes encoding the tRNAs. (Assume both tRNAs exist even if that is not true.) What is the sequence of the RNA-like strand of each tRNA gene that corresponds to the tRNA's anticodon? What is the sequence of the template strand of each gene for these same three nucleotides? Be sure to indicate polarities.

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