Protein Synthesis (DP IB Biology: SL)

Which row of the table best describes the events of polypeptide synthesis?

A piece of DNA was analysed to find the number of nucleotide bases in each of the polynucleotide strands.  Some of the results are shown below.

What is the maximum number of amino acids that could be coded for by this DNA?

What terminates the formation of a polypeptide chain during protein synthesis in cells?

The diagram below represents an electron micrograph of eukaryotic polysomes.

What is the main advantage that polysomes give to a eukaryotic cell?

A polypeptide has the following amino acid sequence:

alanine - alanine - valine - lysine - valine - serine

The table below gives the base sequences for the DNA triplets of each amino acid.

A mutation in the DNA coding for this polypeptide chain caused the tenth nucleotide to change from an A to a T.

Which of the following would represent the amino acid sequence in the polypeptide after the mutation occurred?

Which of the following processes involve both DNA and RNA?

I. Replication

II. Transcription

III. Translation

IV. Protein synthesis

A short section of mRNA that was produced after transcription occurred has the following base sequence:

AAACUUCUCAUAGAACGG

The following table shows the base sequence for codons and the corresponding amino acids that they code for.

Which of the following would represent the correct amino acid sequence coded for by this section of mRNA?

Which of the following applies to both free and bound ribosomes?

I. They produce polypeptides that are destined to be used for processes occurring in the cytosol

II. Translation is interrupted and then re-initiated once movement of the ribosome is complete

III. They are found in all eukaryotic cells and may be either 70S or 80S

IV. They facilitate the binding of mRNA and tRNA and catalyse the formation of peptide bonds

V. They have four binding sites to allow the molecules involved with translation to attach to its subunits

The following steps describes the events taking place during the elongation of a polypeptide in no particular order.

I. Free tRNA molecules bind to their corresponding amino acids due to their specific anticodon and transport it to the ribosome 

II. A tRNA with a complementary anticodon binds to the "A" site bringing its specific amino acid along

III. The initiator tRNA moves from the "P" to the "E" site on the ribosome where it initiates translation

IV. The amino acid carried by the tRNA at the "P" site is linked to the polypeptide chain by a peptide bond

V. tRNA carrying the peptide chain moves from the "A" site to the "P" site as the ribosome moves in the 5' → 3' direction along the mRNA molecule

Which of these steps contain incorrect information?