THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the sense strand of DNA is used as a template to make mRNA
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the antisense strand of DNA is used as a template to make mRNA
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the code in mRNA is read to make a polypeptide
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several ribosomes attach to DNA to make mRNA and then polypeptides
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Detailed explanation-1: -Transcription begins when RNA polymerase binds to a promoter sequence near the beginning of a gene (directly or through helper proteins). RNA polymerase uses one of the DNA strands (the template strand) as a template to make a new, complementary RNA molecule. Transcription ends in a process called termination.
Detailed explanation-2: -During transcription, the DNA of a gene serves as a template for complementary base-pairing, and an enzyme called RNA polymerase II catalyzes the formation of a pre-mRNA molecule, which is then processed to form mature mRNA (Figure 1).
Detailed explanation-3: -In transcription, a portion of the double-stranded DNA template gives rise to a single-stranded RNA molecule. In some cases, the RNA molecule itself is a “finished product” that serves some important function within the cell.
Detailed explanation-4: -The DNA strand that serves as a template for mRNA synthesis is called as anticoding strand or antisense strand or noncoding strand. The other strand is called coding strand or sense strand as its base sequence is same as that of newly synthesized mRNA.
Detailed explanation-5: -Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA). DNA safely and stably stores genetic material in the nuclei of cells as a reference, or template.