Question

The image shown below is a Richardson or ribbon representation of a protein structure. Key components of the structure are labelled with the numbers 1 to 9.

1. Which label marks the last amino acid to be added when the protein is synthesized on the ribosome?

2. Protein structure is more conserved than protein function during the course of protein evolution. Is this statement true or false?

Answer 1

1.

Each mRNA dictates the order in which amino acids should be added to a growing protein as it is synthesized. In fact, every amino acid is represented by a three-nucleotide sequence or codon along the mRNA molecule.Translation, or making a protein from an mRNA sequence, occurs on ribosomes. The amino acids are brought to the ribosome by transfer RNAs (tRNAs). The tRNA pairs up with the mRNA by matching up complementary nucleotides. This ensures that the correct amino acid is added to the protein.

2.True.

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