ss. A particular triplet of what codon sequence when ghe ucleotides in the tempi

Question

ss. A particular triplet of what codon sequence when ghe ucleotides in the tempies stresd of DNA the AOT. This sequence will produe DNA is A) UCA B) AGT C) TCA D) TCU E) AGU 89. Anticodons are found in what molecule? A) mRNA B) ribosome C) tRNA D) DNA E) amino acid 90. Which of the following statements is FALSE negarding translation A) Translation is performed by the ribosome. B) The mRNA strand is read froem 3' to 5" during translation. C) The protein is synthesized from amino terminus (N-terminus) to carboxyl terminus (C-terminus) during translation. D) Translation involves the complementary base-pairing of codons and E) Translation requires the use of a start codon. 1.Durng translation, polypeptidetprotein s synthesis continues until what happens? A) all tRNA's are empty (uncharged) B) no further amino acids are needed by the cell C) the polypeptide is long enough D) the ribosome encounters a stop codon E) the ribosome runs off the end of the mRNA 92. Following translation, a particular polypeptide was chemically analyzed and was found to contain 254 amino acids. How many peptide bonds are present in this polypeptide? A) 245 B) 253 C) 508 D) 255 E) 0 93. Using the codon table on the last page of the exam, determine the amino acid sequence of the protein that will be generated when the ribosome translates the following mRNA sequence -CUAUGUCUUCGUUAUCCUUGUGA--3 A) B) met-ser-leu-ser-leu-ser C) met-glu-arg-arg-gln-leu E) leu-cys-leu-arg-glu-glu

Explanation / Answer

Ans 88) UCA

The DNA strand that mRNA is build of is called is called template strand as it serves as a template for transcription The transcribed mRNA will be UCA as we know Thymine s replaced by Uracil in RNA.

Ans 89) C.Anticodons are found in tRNA.

Ans 90) B. The mRNA strand is read from 3' -> 5' direction is false.

Explain- The mRNA strand is read form 5' ->3' direction.

Ans 91) D. Ribosome encounter a stop codon.

Explain= Protein synthesis stops when ribosome encounter astop codon such as UGA, UAA, UAG. Then protein synthesis terminate.

Ans 92) B. 253

Explain: A dipeptide is composed of 2 amino acid and contain 1 peptide bond. Similarly a tripeptide has 3 amino acid but 2 peptide bond. From this it can be calculated that if "n" is thye number of peptide then the number of petide bind will be "n-1". It is given that the number of amino acid is 254 then the number of peptide bond is 254-1 = 253

Ans 93) E. Leu- cys-leu-arg-glu-glu

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