Answer:
17. It has detached from its amino acid and dissociated from the ribosome
18. Draw a rectangle around CUG
19. GAC
20. Leucine
Explanation:
17. The first tRNA isn't shown in the diagram because it has already dropped off its amino acid (Valine) and has dissociated from the ribosome. Vaine has been added to the amino acid chain and linked to the previous amino acid with a peptide bond. The tRNA will be recycled, picking up another Valine to add it to another growing polypeptide chain
18. A rectangle should be drawn around the CUG codon on the mRNA. Codons are triplet sequences that correspond to anticodons on tRNAs. This is how the sequence of amino acids is determined, making a protein. GUG is the first codon, CAU is the second codon, and CUG is the third codon
19. The anticodon sequence is complementary to the codon sequence. The codon sequence is CUG. C always pairs with G, and U always pairs with A (in mRNA). Therefore, the anticodon sequence is GAC
20. The third amino acid in the protein can be determined by looking up the codon sequence and the genetic code. Since we know the codon sequence is CUG, we can look at the corresponding codon in a table of the genetic code (attached) and see what amino acid it corresponds to. The amino acid corresponding to CUG is Leucine
