The covalent attachment of an amino acid to a tRNA is an endergonic reaction. In other words, it requires an input of energy for the reaction to proceed. Where does the energy come from to attach amino acids to tRNA molecules?

the chemical group responsible for nucleophilic attack in translational elongation is  a) free alpha-NH2 group on amino acid of A site aminocyal tRNA b) the 3=hydroxyl on the 3' end ribose c) the oxygen on the alpha phosphate of the incoming NTP d) the 5= hydroxyl on the 5' end deoxyribose e) an oxyanion on the Y-phosphate of the dNTP

A tRNA anticodon has the base sequence CCG. Identify the DNA base sequence that was used to produce the codon that will bind it to this anticodon?

The synthesis of a protein requires that the amino acids that constitute the growing polypeptide chain be covalently linked to the amino acid attached to the tRNA at the aminoacyl site of the ribosome. Which of the following catalyses this reaction? Options:   the aminoacyl tRNA synthetase   eEF2   eEF1-GTP   a large ribosomal RNA   the initiator tRNA met