Anonymous
06-04-2004, 10:24 PM
Problem 8: Protein coding sequences
The regions of DNA in a eukaryotic gene that encode a polypeptide product are called:
A. hnRNAs
B. exons
C. enhancers
D. leader sequences
E. tRNAs
Introns
The coding regions of many eukaryotic genes are interrupted by non-coding sequences known as introns. Introns are stretches of DNA whose transcripts are absent from mature mRNA product. Exons are stretches of DNA whose transcripts are present in mature mRNA and encode the product of the eukaryotic gene. The relationship between the interrupted exons at the DNA sequence level and the spliced exons in the mRNA is shown in the diagram.
http://www.biology.arizona.edu/molecular_bio/problem_sets/mol_genetics_of_eukaryotes/graphics/08t.gif
ans:
B. exons
Exons are joined together during splicing, and translated on ribosomes into the polypeptide product of the gene.
The regions of DNA in a eukaryotic gene that encode a polypeptide product are called:
A. hnRNAs
B. exons
C. enhancers
D. leader sequences
E. tRNAs
Introns
The coding regions of many eukaryotic genes are interrupted by non-coding sequences known as introns. Introns are stretches of DNA whose transcripts are absent from mature mRNA product. Exons are stretches of DNA whose transcripts are present in mature mRNA and encode the product of the eukaryotic gene. The relationship between the interrupted exons at the DNA sequence level and the spliced exons in the mRNA is shown in the diagram.
http://www.biology.arizona.edu/molecular_bio/problem_sets/mol_genetics_of_eukaryotes/graphics/08t.gif
ans:
B. exons
Exons are joined together during splicing, and translated on ribosomes into the polypeptide product of the gene.