Flashcards
Structure of proteins
Cards in this deck (19)
- 1A dipeptide is named with...a -yl ending for the N terminal amino acid & the full name of the C terminal end
- 2Which protein was the first to have its primary structure determined?Insulin
- 3Insulin: primary structure configuration2 polypeptide chains linked by disulfide bonds.
Chain A has 21 amino acids
Chain B has 30 amino acids - 4Hydrophobic interactions are interactions between..nonpolar groups
- 5Hydrophilic interactions are attractions between...polar or ionized groups and water on the surface of the tertiary structure
- 6What type of interactions are salt bridges...ionic interactions
- 7Disulfide bonds are...strong covalent links between sulfur atoms of two cysteine amino acids
- 8Globular Proteins: shape, function & example- compact, spherical shapes (globe)
- carry out synthesis, transport & metabolism in the cells
- Eg. myoglobin store & tranport oxygen in muscle - 9Fibrous proteins: shape, function, examples- long, fiber-like shapes
- involved in the structure of cells & tissues
- Eg. Alpha keratins which make up hair, wool, skin & nails
- Eg. Beta keratins in feathers of birds & scales of reptiles - 10Protein hydrolysis does what?splits the peptide bonds to give smaller peptides and amino acids
- 11Protein hydrolysis: functionthe digestion of proteins when digestive enzymes split the peptide bonds
- 12Differences between hydrolysis in the lab and hydrolysis in the body- in the lab, it requires an acid or base, water & heat
- in the body, enzymes catalyze the hydrolysis of proteins - 13Denaturation: definitioninvolves disruption of any of the bonds that stabilise the secondary, tertiary & quaternary protein structures
- 14How does heat denature proteins? Example?By breaking apart hydrogen bonds & disrupting hydrophobic interactions
Eg. cooking food to make the proteins more digestible (egg)
Eg. Using heat to disinfect surgical instruments & gowns by denaturing the proteins of any bacteria present. - 15How do acids & bases denature proteins? Example?- Affects the hydrogen bonding between polar R groups & disrupts the ionic bonds (salt bridges)
- Eg. In the preparation of yoghurt & cheese, a bacteria that produces lactic acid is added to denature the mil protein & produce solid casein. - 16Example of how acids & bases denature proteins?- Eg. In the preparation of yoghurt & cheese, a bacteria that produces lactic acid is added to denature the milk protein & produce solid casein.
- Eg. Tannic acid in burn ointments, coagulates proteins at site of the burn, forming a protective cover & preventing further loss of fluid from the burn. - 17How do organic compounds denature proteins?Act as disinfectants by forming their own hydrogen bonds with a protein & disrupting the hydrophobic interactions.
Eg. Alcohol swab used to clean wounds because alcohol coagulates the proteins inside bacteria. - 18How do heavy metal ions denature proteins?They react wit the disulfide bonds to form solids
- 19How does agitation denature proteins?Whipping or beating that stretches the peptide chains until weak bonds break
Information
- Description
- Chemistry Flashcards on Structure of proteins, created by travel_bug on 23/09/2013.
- Created by
- travel_bug
- Views
- 37
- Tags
- Rating