Question

Which of the following is NOT an accurate description of protein synthesis and folding?

a. Many copies of a protein can be synthesized simultaneously from the same mRNA.
b. The 3D shape of a protein is determined largely by the ribosome forming the protein.
c. The entire chain of amino acid exits the ribosome before it begins folding into its 3D shape.
d. The first encoded amino acid in every protein is methionine.

Answer 1

The entire chain of amino acids exits the ribosome before it begins folding into its 3D shape. All options are correct

Step-by-step explanation:

The accurate description of protein synthesis and folding is:

1. Many copies of a protein can be synthesized simultaneously from the same mRNA.
2. The 3D shape of a protein is determined largely by the ribosome forming the protein.
3. The entire chain of amino acid exits the ribosome before it begins folding into its 3D shape.
4. The first encoded amino acid in every protein is methionine.

Protein synthesis begins with the formation of an initiation complex, involving the small ribosomal subunit, mRNA template, initiation factors, and a special initiator tRNA. The initiator tRNA has an anticodon that interacts with the start codon AUG and is charged with the amino acid methionine.

Therefore, methionine is the first amino acid in every polypeptide chain.

All options are correct