9. If an amino acid substitution occurred in a polypeptide chain, predict which option would have the most significant
impact on the structure and function of the final protein? Why?
a. Serine is replaced by glutamate
b. Alanine is replaced by lysine
c. Glycine is replaced by valine

Environmental impacts on evolution : mastery test

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

The empty trna moves off and picks up another matching amino acid from the cytoplasm in the cell. the anticodon of the trna, with its attached amino acid, pairs to the codon of the mrna, which is attached to a ribosome. this sequence is repeated until the ribosome reaches a stop codon on the mrna, which signals the end of protein synthesis. the ribosome forms a peptide bond between the amino acids, and an amino acid chain begins to form. when a second trna with its specific amino acid pairs to the next codon in sequence, the attached amino acid breaks from the first trna and is bonded to the amino acid of the second trna.