As Scientists Were Unraveling the Mysteries Associated with Transcription and Translation,they

question 13

Multiple Choice

As scientists were unraveling the mysteries associated with transcription and translation,they discovered there was not a one-to-one correspondence between nucleotide sequence of a gene and base sequence of the mRNA it codes for.They proposed the genes-in-pieces hypothesis.How can the genes-in-pieces hypothesis be explained?

• A)Introns are noncoding segments of DNA that are present in the initial transcript,but are removed by splicing.
• B)Introns are noncoding segments of DNA that are not read or transcribed by RNA polymerase II.
• C)Exons are noncoding segments of DNA that are not read or transcribed by RNA polymerase II.
• D)Exons are noncoding segments of DNA that are present in the initial transcript,but are removed by splicing.

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