As Scientists Were Unraveling the Mysteries Associated with Transcription and Translation

question 34

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) Several related genes are found in the genomes of humans and other animals.
• C) Introns are noncoding segments of DNA that are not read or transcribed by RNA polymerase II.
• D) Exons are noncoding segments of DNA that are not read or transcribed by RNA polymerase II.