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Given the following section of DNA from the coding strand for an mRNA transcription and is in its proper reading frame, what would be the correct peptide sequence after translation?

CTAGATCCGTGA

A) Gly-Leu-Asp

B) Leu-Asp-Pro

C) Pro-Asp-Leu

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Casey Durgan
Casey DurganLv2
28 Sep 2019

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Related questions

Biochemistry

Which of the following pentapeptides is expected to be the BESTdissolved in water?

Select one:

a. NH2 - ser - pro- gly - ala- cys - asn - COOH

b. NH2 - tyr - thr - gly - ser - gln - asp - COOH

c. NH2 - ser - ala - gly - phe - gln - asp - COOH

d. NH2 - gly - leu - phe - val - ser - gly - COOH

A protein has a molecular mass of 200 kDa as determined by gelfiltration (=native molecular weight). When separated by SDS-PAGE(without a reducing agent present) only one polypeptide appearedwith a mass corresponding to 100 kDa. When determined by SDS-PAGEin combination with a reducing agent (DTT) exactly two polypeptidesappeared of sizes 40 and 60 kDa. What is the correct structure ofthe native protein?

Select one:

a. The native protein is made of one 40 kDA and one 60 kDApolypeptides

b. The native protein is made of two 100 kDa polypeptides

c. The native protein is made of two 40 kDA and two 60 kDApolypeptides

d. The native protein is made of four polypeptides - two 100 kDapolypeptides, one 40 kDA and one 60 kDA polypeptides

e. None of the answers is correct.

4. It is possible to make some predictions about protein secondary structure based on the primary sequence. Consider the following amino acid sequence.

Ile-Ala-His-Thr-Tyr-Gly-Pro-Phe-Glu-Ala-Ala-Met-Cys-Lys-Trp-Glu-Ala-Gln-Pro-Asp-Gly-Met-Glu-Cys-Ala-Phe-His-Arg

(a) Where might B turns occur?

(b) Where might intrachain disulfide cross-linkages be formed?

(c) Assuming that this sequence is part of a larger globular protein, what is the probable location (exterior or interior of the protein) of the amino acid residues and explain your reasoning.

Asp Ile Thr Ala Gln Lys

1. The amino acid sequence of a particular polypeptide in awild-type bacterium and three single point mutant strains are shownin the following table:

Wild type= Met-Tyr-Ile-Thr-Trp-Glu-Glu-Pro-Val-Lys

Mutant 1= Met-Tyr-Ile-Thr-Trp-Asp-Glu-Pro-Val-Lys

Mutant 2= Met-Tyr-Ile-Pro-Gly-Arg-Asn-Gln

Mutant 3= Met-Tyr-His-Tyr-Leu-Gly-Gly-Thr-Ser-Lys

  1. For each mutant indicate the type of point mutations(transition, transversion, insertion or deletion) and the codon inwhich it occurred.
  2. B. Determine to the extent that is possible, the ribonucleotidesequence of the wild type mRNA molecule.

2. Mutations in several different genes that encode enzymes inthe pathway for the synthesis of the heme group may cause a geneticdisorder called methemoglobinemia. The symptoms of this disorderrange form mild to death in the most severe cases. The enzymecytochrome b5 reductase is one of the enzymes in this pathway. Thisenzyme is responsible for reducing the iron in the heme group tothe ferrous state so that it can bind oxygen. Kobayashi et al.reviewed several mutations in this gene. One of these mutationscauses a Ser to Pro substitution. Explain what nucleotide changeand in which position in the codon can cause this amino acidchange. Assign all possible appropriate terms to this mutation.

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