Now our 3rd RNA is called tRNA or transfer RNA. Here it's the smallest RNA of the 3. It carries amino acids to the ribosome during protein synthesis. Now, here it's going to contain what we call an anticodon. These are just our 3 nucleotides complementary to the mRNA codon. So remember, mRNA has codons, which are our 3 nucleotides. tRNA has anticodons, which are complementary to it. Now, here it's going to contain what we call an acceptor stem and it's at the 3' prime end where amino acids bind. And, we're going to say here that tRNA itself can form a complex 3D cloverleaf-shaped structure. So, if we take a look here, we're going to say that our amino acid is attaching to the 3' prime end here, this blue sphere, and, remember, we have 20 amino acids that we learned previously in our earlier chapters. tRNA is just this entire structure. Now if we were to expand a little bit further, we can see that this structure that's tRNA has these things here on the bottom. These represent our anticodon. Remember, when we copied a portion of DNA to make our mRNA, we created a codon. This codon of our 3 nucleotides here. These 3 nucleotides are complementary to the anticodon of our tRNA. Remember, G links up with C, A links up with U, it's U because remember, RNA deals with uracil not thymine and then again G with C. So these 3 link up with these 3, the codon with the anticodon. So, just remember tRNA may be the smallest RNA but we can see that in its shape it's pretty complex looking. We have our 3' prime end here which the acceptor stem adds or which acts as the acceptor stem where we have the amino acid that can bind. We have our 5' prime end over here. This structure, if you really look at it, kind of resembles a clover leaf. Okay. So that's why they call it that particular shape, because it kind of resembles this, cloverleaf that we have in the right-hand corner. Right? So just remember, this represents our 3rd RNA, which is our smallest RNA.