Gene Expression II INP

What is the function of the start codon in protein translation?

• It signals the termination of translation

• It marks the binding site for tRNA

• It defines the reading frame for translation

• It catalyzes peptide bond formation

Which of the following is a characteristic of a eukaryotic ribosome?

• It consists of 30S and 50S subunits

• It is composed of RNA and protein molecules

• It is smaller than prokaryotic ribosome

• It only operates in the nucleus

During translation, what is the role of the tRNA molecule?

• It catalyzes peptide bond formation

• It brings amino acid to the ribosome

• It binds to the stop codon to termination translation

• It separates the ribosomal subunits

What happen during the elongation phase of protein translation?

• The ribosome subunits are assembled

• Amino acids are added sequentially to the growing polypeptide chain

• The mRNA is exported from the nucleus

• The ribosome reaches a stop codon

Which codon sequence corresponds to the amino acid methionine (Met) in most organisms?

• UGA

• AUG

• UAA

• UGG

What signals the termination of protein translation?

• A tRNA carrying the stop codon

• The release factor binding to the stop codon

• The ribosome reaching the 5' cap of the mRNA

• A signal sequence within the polypeptide chain

What is the role of mRNA in translation?

• It transports amino acids to the ribosome

• It provides the template for assembling the polypeptide sequence

• It catalyzes peptide bond formation

• It assembles the ribosome subunits

What is the primary role of ubiquitin in protein degradation?

• It transports proteins to the nucleus

• It tags proteins for degradation in the proteasome

• It blocks protein synthesis

• It stabilizes the protein structure

What are the two components of a ribosome?

• Protein and DNA

• RNA and protein

• RNA and DNA

• Lipids and protein

Which ribosomal site is responsible for holding the growing polypeptide chain during translation?

• E-site (Exit)

• P-site (Peptidyl)

• A-site (Aminoacyl)

• R-site (Ribosomal)