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Proteins
OCR A proteins flashcards
| Question | Answer |
|---|---|
| At which level do ionic bonds occur? | Secondary |
| In a solution, which amino acids have a charge? | Lysine and Aspartate |
| Is Ala hydrophobic, hydrophilic, acidic or basic? | Hydrophobic |
| Is Ser hydrophobic, hydrophilic, acidic or basic? | Hydrophilic |
| Is Lys hydrophobic, hydrophilic, acidic or basic? | Basic |
| Is Asp hydrophobic, hydrophilic, acidic or basic? | Acidic |
| What does the quaternary structure depend on? | The primary structure as higher structures depends on the amino acid sequence. |
| What is the quaternary structure of haemoglobin? | Four polypeptide chains joined together |
| What level do hydrophobic interactions occur? | Tertiary and quaternary |
| What makes haemoglobin a globular protein? | Having hydrophilic groups on its outside, meaning it is solub le in water |
| What types of bonds holds together an alpha helix or a beta pleated sheet of a protein | Hydrogen bonds |
| When a peptide group is formed, what happens to one of the amino acids? | One of the amino acids loses a hydroxyl group from its carboxyl group |
| Where is a dipeptide bond found? | Between each N-C-C backbone |
| Where is the prosthetic group found in haemoglobin? | In each of the 4 polypeptide chains |
| Which bonds are the last to break when an enzyme is heated? | The disulphide bonds as they are the stongest |
| Which bonds hold together the tertiary structure bonds? | Disulphide bonds, hydrophobic interactions, and hydrogen bonds |
| Which level of protein structure would remain unchanged when a protein is treated with urea? | Primary |
| Which protein consists of 4 polypeptide chains (2 alpha sub-units and 2 beta sub-units), each with its own prosthetic group called a haem/heme group? Its role is to be transported around the body in red blood cells. | Haemoglobin |
| Which protein consists of 2 polypeptide chains and no prosthetic group? Its role is as a hormone in the regulation of blood glucose concentration. | Insulin |
| What is the name of the monomer that makes up proteins? | Amino acid |
| What is the general term for a protein that has a prosthetic group? | A conjugated protein |
| What is the name of a complete reagent that is used to test the presence of protein? | Biuret's reagent |
| What type of bond forms between negatively and positively charged R-groups to help hold tertiary structure of a polypeptide chains in place? They are also involved in holding polypeptide chains together in the quaternary structure. | Ionic bond |
| What is the name of the part of an amino acid that varies from one amino acid to another? | R group |
| Which fibrous protein is insoluble in water, has low flexibility and it inelastic? | Keratin |
| Which category of proteins are long and thin, insoluble in water and tend to have simple repeated structures with a limited number of different amino acids, and have a structural role. | Fibrous proteins |
| What is the name of the bond that joins amino acids together to forma chain? | Peptide bonds |
| Which fibrous protein is insoluble in water, flexible and inelastic? It is found in ligaments, cartilage and the walls of arteries and veins where it prevents them over-stretching and protects them from physical damage. | Collagen |
| When a protein is made of two or more polypeptide chains joined together is it said to have which structure? | Quaternary |
| What is the prosthetic group of haemoglobin? | Haem group |
| What type of bond hods the secondary structure of a polypeptide chain in place? | Hydrogen bond |
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Golbs_Helmet