A peptide has the sequence NH_2-phe-pro-lys-gly-phe-pro-COOH. Which of the follo

Question

A peptide has the sequence NH_2-phe-pro-lys-gly-phe-pro-COOH. Which of the following sequences in the coding strand of the DNA could code for this peptide? A) 3' UUU-CCC-AAA-GGG-UUU-CCC B) 3' AUG-AAA-GGG-TTT-CCC-AAA-GGG C) 5' TTT-CCC-AAA-GGG-TTT-CCC D) 5' GGG-AAA-TTT-AAA-CCC-ACT-GGG E) 5' ACT-TAC-CAT-AAA-CAT-TAC-UGA What is a ribozyme? A) an enzyme that uses RNA as a substrate D) an enzyme that catalyzes the association B) an RNA with enzymatic activity C) an enzyme that eatalyzes the association between the large and small ribosomal subunits D) an enzyme that synthesizes RNA as part of the transcription process E) an enzyme that synthesizes synthesizes RNA primers during DNA replication A particular triplet of bases in the template strand of DNA is S' AGT 3'. The corresponding codon for the mRNA transcribed is A) 3' UCA 5'. B) 3' UGA 5'. C) 5' TCA 3'. D) 3' ACU 5'. E) either UCA or TCA, depending on wobble in the first base. Which of the following investigators was/were responsible for the following discovery? In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine. A) Frederick Griffith B) Alfred Hershey and Martha Chase C) Oswald Avery, Maclyn McCarty, and Colin MacLeod D) Erwin Chargaff E) Matthew Meselson and Franklin Stahl Cytosine makes up 42% of the nucleotides in a sample of DNA from an organism. Approximately what percentage of the nucleotides in this sample will be thymine? A) 8% B) 16% C) 31% D) 42% E) It cannot be determined from the information provided. In an analysis of the nucleotide composition of DNA, which of the following will be found? A) A = C B) A = G and C = T C) A + C = G + T D) G + C = T + A At a specific area of a chromosome, the sequence of nucleotides below is present where the chain opens to form a replication fork: 3' C C T A G G C T G C A A T C C 5' An RNA primer is formed starting at the underlined T(T) of the template. Which of the following represents the primer sequence? A) 5' G C C T A G G 3' B) 3' G C C T A G G 5' D) 5' A C G U U A G G 3' E) 5' G C C U A G G 3' C) 5' A C G T T A G G 3' Which of the following help(s) to hold the DNA strands apart while they are being replicated? A) primase B) ligase C) DNA polymerase D) single-strand binding proteins E) exonuclease

Explanation / Answer

11. The DNA sequence for the given peptide is

Ans: C. 5’TTT CCC AAA GGG TTT CCC 3’.

12. A ribosome is

Ans: B. A RNA with enzymatic activity.

13. The sequence of the codon in mRNA is

Ans: A. 3’UCA 5’

14. DNA from any species, Amount of A =T and amount of G=C is discovered by

Ans. D. Erwin Chargaff.

15. C=42% then the % of T in the same sample is

Ans: A. 8%

Because, if C=42% then G=42%, then A+T= 16%. As A=T then T=8%.

16. In the analysis of DNA sample -

Ans. None of them.

A=C is wrong always A=T, A=G& T=C is not true because A=T and G=C, A+C=G+T is wrong because A+G=T+C, similarly   A+T=G+C is wrong because A+G=T+C.

17. The sequence of the RNA primer is

And. D: 5’ACGUUAGG3’

18. Ans. D. Single strand binding protein helps to holds the DNA strand apart while they are being replicated.

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