Bio Exam 3 TP Clicker Questions

Bio Exam 3 TP Clicker Questions - 64. A gene is a sequence...

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64. A gene is a sequence of DNA bases that is transcribed into a complementary sequence in an RNA molecule. Which statement about transcription is NOT correct? A. Some genes are transcribed into RNA molecules that are never translated into protein. B. Many genes in eukaryotes code for proteins, but the initial RNA transcripts are not mRNAs. C. In eukaryotes there are three types of RNA polymerase enzymes; two of these transcribe protein-coding genes. D. In bacteria, translation of mRNA molecules into protein begins even before the mRNA is fully transcribed. 65. Which RNA polymerase is responsible for transcription of protein-coding genes? A. Pol I B. Pol II C. Pol III 66. In eukaryotes, where do splicing and addition of the 5’ cap and poly-A tail take place? A. In the cytoplasm B. In the nucleus C. Splicing takes place in the nucleus, addition of the cap and tail takes place in the cytoplasm. D. Addition of the cap and tail takes place in the nucleus, splicing takes place in the cytoplasm. 67. Which RNA polymerase(s) is(are) responsible for transcription of genes that code for transfer RNAs? A.RNA Pol I B.RNA Pol II C.RNA Pol III D.B. and C. 68. Introns are known to contain stop codons (UAG, UGA, UAA), but such codons do NOT terminate the translation of any protein. Why not? A. These codons are really “start” codons, not ”stop" codons. B. Stop codons do not code for amino acids. C. These stop codons are removed prior to translation. D. Stop codons located in introns are followed by a start codon that prevents termination of translation. 69. Introns are known to contain start codons (AUG), but such codons do NOT initiate the translation of any protein. Why not? A. AUG is a ”stop" codon, not a start codon. B. AUG does not code for an amino acid or initiate translation unless it is located within an exon. C. All AUG codons in the initial mRNA transcript are removed prior to translation. D. AUG start codons located in introns are followed immediately by stop codons that prevent the intiation of translation.
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70. Which of the following statements is CORRECT? A. A compound other than a protein enzyme is able to catalyze the formation of peptide bonds. B. Peptide bond formation occurs within the small subunit of the ribosome. C. Protein enzymes catalyze the formation of peptide bonds between adjacent amino acids.
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This note was uploaded on 01/22/2011 for the course BIO 100 taught by Professor Sokolove during the Fall '08 term at UMBC.

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Bio Exam 3 TP Clicker Questions - 64. A gene is a sequence...

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