Two amino acids<span> are linked together by the formation of a </span>peptide<span> bond. </span>Amino acids<span> joined by a series of </span>peptide bonds to make<span> a </span>peptide<span> chain. Thus , a protein molecule is a </span>polypeptide chain <span>composed of many </span>amino acid residues<span>.</span>
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The answer is 800 meters.
You find this by taking the total distance of the first lap and doubling it. You could also find it by adding 400 meters to 400 meters, which would total at 800 meters