Practice Questions

RNA synthesis uses nucleoside triphosphates (ATP, CTP, GTP, UTP); the cleavage of pyrophosphate yields the energy needed for polymerization.

Eukaryotic structural genes are organized as split sequences where protein-coding regions (exons) are interrupted by non-coding regions (introns).

The anticodon loop exposes three nucleotide bases designed to form anti-parallel hydrogen bonds with the matching mRNA codon triplet.

Capping enzymes require the 5' triphosphate terminal structure of the nascent RNA transcript to successfully link the inverted guanosine cap.

The P (peptidyl) site retains the tRNA molecule attached to the evolving polypeptide chain before transferring it to the incoming A-site tRNA.

The A (aminoacyl) site welcomes the newly arrived, charged tRNA molecule carrying the next amino acid to be added to the growing peptide chain.

The physical stress of the hairpin combined with the weak hydrogen bonds of the U-rich stretch forces the transcript to detach from the DNA template.

Uncharged tRNAs lack attached amino acids; their buildup indicates that the cell is running low on amino acids to fuel protein translation.

RNA polymerases possess the unique biochemical capacity to initiate the synthesis of a new polynucleotide chain completely de novo.

Double-stranded RNA genomes rely on regular hydrogen bonds between complementary base pairs, specifically adenine-uracil and guanine-cytosine.