Final answer:
The common features of tRNA are its L-shaped structure, anticodon loop, and function as an adaptor in protein synthesis, accurately pairing amino acids to codons during translation. Notably, tRNA is universally important for translation across different types of cells. The correct option is A. True
Step-by-step explanation:
The question asked is related to the structure and function of transfer RNA (tRNA). The statement 'All known transfer RNA molecules have the following features' is presented without specifying the features, hence we cannot determine its veracity.
However, generally speaking, although there are different types of tRNA with variations in their sequence, they all generally share some common structural features, such as the L-shaped three-dimensional structure, an anticodon loop that pairs with the mRNA codon, a 3' terminal end that binds an amino acid, the D-loop, and the TΨC loop.
Additionally, they all function as adaptors for protein synthesis, matching amino acids to the corresponding codons on the mRNA during translation.
Addressing the referenced content, the answers to the true or false questions would be: statement 7 (RNA bases) is False as RNA contains A, C, G, and U (not T); statement 8 (RNA double helix) is False as RNA is typically single-stranded; statement 11 (introns binding to tRNA) is False as introns are non-coding regions removed during mRNA processing; statement 12 (tRNAs as the link between amino acids and codons) is True. The correct option is A. True