The long chains of amino acids fold to give each type of protein molecule a specific shape. The particular shape that a protein molecule has allows other molecules to fit into it. This is particularly important for antibodies and enzymes.
Introduction: The Wolds Way National Trail is a long distance footpath that follows a natural chalk escarpment which runs from Hull to Filey. At just over 76 miles long the walk crosses beautiful East Yorkshire countryside.
It is generally considered to be Toronto's main street and claims to the longest main street in the world, running from the shore of lake Ontario in the Harbourfront neighbourhood to Lake Simcoe, a total distance of 1,896 km (1,178 mi).