Public Transit in Iowa. Demand Response â Provided by the 16 regional transit agencies. Ride reservations are made in advance, normally 24 hours, with the bus picking up the passenger at their location and taking them to their destination. Service is available to the general public, including persons with disabilities.
Structure. Proteins are polymers made up of amino acid subunits bonded together by peptide bonds. This occurs by a condensation reaction. Primary Structure. 1  Given by the sequence of amino acids in the polypeptide.2  Controls all levels of further folding.roteins are polymers made up of amino acid subunits bonded together by peptide bonds. This occurs by a condensation reaction. Primary Structure. 1  Given by the sequence of amino acids in the polypeptide. 2  Controls all levels of further folding.
Animals can have internal or external skeletons-while some do not have a skeleton at all. Insects have an external skeleton made of chitin. Sharks have an internal skeleton made of cartilage, and humans have an internal skeleton made of cartilage and bone. Hinge joints and ball and socket joints are synovial joints.The biceps and triceps muscles act as an antagonistic pair to move the arm at the elbow.nsects have an external skeleton made of chitin. Sharks have an internal skeleton made of cartilage, and humans have an internal skeleton made of cartilage and bone. Hinge joints and ball and socket joints are synovial joints. The biceps and triceps muscles act as an antagonistic pair to move the arm at the elbow.