A sequence of nucleotides in a DNA strand- 5^' -TTAACGGCTTITITC-3'was used as a template to synt

step 1 The L -A -R -N -A transcript for the sequence would look like this. A -A -U, G -C -G, A -U -A -U

A sequence of nucleotides in a DNA strand- 5^'...

A sequence of nucleotides in a DNA strand- $5^{\prime}$ -TTAACGGCTTITITC-3'was used as a template to synthesize an mRNA that was then translated into protein. Predict the C-terminal amino acid and the N-terminal amino acid of the resulting polypeptide. Assume that the mRNA is translated without the need for a start codon.

Key Concepts

Protein Terminology: N-terminal and C-terminal

Proteins are directional polymers with a distinct beginning and end. The N-terminal refers to the end of the protein that has a free amino group and is the first part of the polypeptide to be synthesized during translation, whereas the C-terminal is the end with a free carboxyl group that is added last. Understanding the N-terminal and C-terminal is important for studying protein structure, function, and processing during and after translation.

Codon Recognition and Reading Frame

The reading frame is determined by dividing the mRNA sequence into successive, non-overlapping codons, each consisting of three nucleotides. The correct reading frame is essential because a shift in the grouping of nucleotides results in completely different codons and, consequently, a different amino acid sequence. Codon recognition involves matching these triplets to the corresponding amino acids during protein synthesis.

DNA Transcription

DNA transcription is the process by which the genetic information encoded in a DNA template strand is copied into a complementary mRNA sequence. During transcription, RNA polymerase reads the DNA in the 3' to 5' direction and synthesizes an mRNA strand in the 5' to 3' direction, replacing thymine with uracil in the RNA. This process is fundamental for transferring genetic codes from DNA, which is stored in the nucleus, to mRNA, which carries the code to the ribosome for protein synthesis.

mRNA Translation

mRNA translation is the process in which the ribosome decodes the genetic information carried by mRNA to synthesize a protein. The mRNA is read in the 5' to 3' direction, with each set of three nucleotides (codon) corresponding to a specific amino acid as determined by the genetic code. This process involves assembling the amino acids in the correct order to form a polypeptide, which folds into a functional protein.

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