Which statement best describes a physical change? changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same. changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same. changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same. changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.

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.