Chemical Composition of the Body

Proteins Composed of ____________. How many? Made up of 3 functional groups: ______________ Info to make proteins??

Fig 2.26

The Making of a Protein Via dehydration synthesis. Formation of ____________ leads to di________, tri__________, oligo__________, poly____________ 1 structure Polypeptide chains varie in length from 3 to 4,500 amino acids. Fig 2.27

Levels of Protein Structure Fig 2.28

Tertiary Protein Structure What determines the function of the protein? Weak bonds of tertiary structure lead to easy ______________ by pH and Temp. Reversible? Fig 2.29

Protein Structure, cont. Some functional proteins are composed of multiple polypeptide chains covalently bonded together.  = ________________ Examples

Conjugated Proteins Protein must combine with other molecule to become functional Glycoprotein = Protein + ________ Examples: some hormones, proteins in cell membranes  often function as ____________ Lipoprotein = Protein + ______ Examples: in cell membranes, carrier molecules in blood

Protein Functions Can you name some? Structural: collagen fibers in connective tissues; keratin in skin Enzymes: assist every chemical process in the body Hormones Antibodies = protective: part of the immune system Receptors: receive communication from other cells for regulation of cell activity Carriers: across cell membranes or in blood Enzymes Membrane transporters Signal molecules Receptors Binding proteins Immunoglobulins Regulatory proteins

Nucleic Acids Name the types: Building blocks of nucleic acids? Composition?