In the process of transcription, the strand of DNA with...

In the process of transcription, the strand of DNA with polarity acts as a strand. (a) $5^{\prime} \rightarrow 5^{\prime}$, Coding strand (b) $3^{\prime} \rightarrow 5^{\prime}$ Template strand (c) $3^{\prime} \rightarrow 3^{\prime}$, Coding strand (d) $5^{\prime} \rightarrow 3^{\prime}$, Template strand

In the process of transcription, the strand of DNA with polarity acts as a strand.
(a) $5^{\prime} \rightarrow 5^{\prime}$, Coding strand
(b) $3^{\prime} \rightarrow 5^{\prime}$ Template strand
(c) $3^{\prime} \rightarrow 3^{\prime}$, Coding strand
(d) $5^{\prime} \rightarrow 3^{\prime}$, Template strand

Key Concepts

Coding Strand

The coding strand, also known as the non-template strand, is the DNA strand that has the same sequence as the newly-synthesized RNA, except that thymine (T) is replaced by uracil (U) in RNA. This strand runs in the 5' to 3' direction and is not used by RNA polymerase during transcription, but its sequence is important because it represents the gene's genetic code.

Template Strand

The template strand in transcription is the DNA strand that is read by RNA polymerase to synthesize the mRNA molecule. It is oriented in the 3' to 5' direction relative to the direction of polymerase movement, ensuring that the newly formed RNA is built in the 5' to 3' direction. This strand is complementary to the mRNA and directly determines its nucleotide sequence.

Transcription

Transcription is the process by which the genetic information in DNA is copied into messenger RNA. It involves multiple steps and enzymes, most notably RNA polymerase, which synthesizes the RNA strand by reading the DNA template. This process is fundamental for gene expression and ultimately for protein synthesis, as the resulting mRNA will be translated into a polypeptide chain.

DNA Polarity

DNA strands have inherent directionality, reflected by their 5' to 3' and 3' to 5' ends. This antiparallel structure is critical for many biological processes, including replication and transcription. The orientation of the strands ensures that enzymes like polymerases, which can only add nucleotides to a free 3' hydroxyl group, work correctly during synthesis.

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