Which statement correctly describes proteins? A
Polypeptide chains are formed in the nucleus.

B
DNA is the original source of protein structure.

C
The function of a protein is determined by the RNA.

D
Each nucleotide base is encoded into a single amino acid.

B

Explanation:

A - not correct since polypeptide chains are formed in ribosomes which exist in the cytoplasm

C. not correct -protein function is determined by DNA

D.  not correct - 3 nucleotides aka a codon is encoded into a single amino acid.

wheres the options ? : (

explanation:

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation: