MRNA has some additional sequences that are not translated and are known as

Explanation:

mRNA has some additional sequences that are not translated and are referred as untranslated regions, (UTRs). The UTRs are present at both 5 end (before start codon) and at 3-end (after stop codon). They are required efficient translation process.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]