What does the $3D$ structure of a transfer $RNA$ $(tRNA)$ molecule look like?

The exon part of $m-RNA$ codes for .............

Describe $tRNA$ as an adapter molecule.

During protein synthesis,$AUG$ functions as the initiator codon in $mRNA$. What should be the anticodon on the $tRNA$ molecule that picks up and brings the amino acid specified by this codon?

The given figure shows two $tRNA$ molecules. Which amino acids are attached to these $tRNAs$ ($P$ and $Q$)?

Define/Explain the following:
$1.$ Transfer $\text{RNA}$ $(t\text{-RNA})$
$2.$ Ribosomal $\text{RNA}$ $(r\text{-RNA})$