Three letter segments of mRNA code for specific
A. Disorders
B. Sickle cells
C. Amino acids
D. Chromosomes
A. Disorders do not have specific three letter segments of mRNA code. Disorders are typically caused by mutations or alterations in the DNA sequence, which can affect the mRNA and protein products.
B. The genetic mutation responsible for sickle cell disease is a substitution of one nucleotide in the DNA sequence, resulting in a change from the amino acid glutamic acid to valine in the protein. This mutation is represented by the three letter mRNA code segment GAG (glutamic acid) changing to GUG (valine).
C. Amino acids are represented by specific three letter segments of mRNA code called codons. For example, the codon GAA codes for the amino acid glutamic acid, while the codon AUG codes for the amino acid methionine, which is also the start codon.
D. Chromosomes do not have specific three letter segments of mRNA code. Chromosomes are made up of DNA, which contains the coding sequences for genes. The mRNA is transcribed from the DNA and carries the genetic information to the ribosomes for protein synthesis.