Question

How does trna is used when building protiens

Answer 1

Ribosomes are the building blocks of trna, that are produced in the mitochondria, aka the powerhouse of the cell

Answer 2

TRNA carries a single amino acid to the ribosome.
It fits the codon on the mRNA in the ribosome with it's anti-codon.

The ribosome has peptidyl-transferase activity which catalyses the peptide bond between 2 amino acids on 2 tRNAs in the ribosome.

One tRNA is released and then picks up another amino acid depending on its anti-codon.