Erstellt von scarlettjaynem
vor fast 10 Jahre
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Frage | Antworten |
Which chemical elements make up proteins? | Carbon, Hydrogen, Oxygen and Nitrogen and occasionally sulphur |
How do plants gain their proteins for growth? | They can absorb carbon, hydrogen and oxygen from carbon dioxide and water. Nitrogen mus be obtained from the soil |
How do animals obtain their proteins for growth? | Through our food |
Test for protein | Heat in presence of soda lime. The gas released will turn moist pH paper blue. |
What are proteins used for in the body? | Cell Structures - membranes Hormones - insulin Body Structures - hair,nails Enzymes Muscle fibers Binding proteins - haemoglobin |
How many functional groups does an amino acid have? | 2 - amino group (NH2) and a carboxl group (COOH) |
How can amino acids link up to form a chain? | Because they all have 2 functional groups which can combine to make an amide link in a condensation reaction. |
What is a peptide? | a unit made up of a small chain of amino acids (tripeptide - 3 amino acids) |
What are two alternative names for proteins? | Polyamides and polypeptides |
How many amino acid molecules are in a typical protein? | 2-3 hundred |
What is this? | Amide link |
Why are some amino acids known as "essential"? | Because we cannot make them in out bodies, they must be consumed through our food. |
What are the 4 steps of protein hydrolysis? | Protein foods Breaking down proteins Absorbing amino acids bulilding proteins |
Describe the Breaking down of proteins | Acids and enzymes in the digestive system help break down the peptide |
Describe the Absorbing of amino acids | While protein molecules are too large to pass through the walls of the gut, individual amino acids are small enough o they pass through the wall and are absorbed into the bloodstream. |
Describe the building of proteins | Amino acids are joined together in a different sequence, changing the final protein |
What determines the type of protein built? | the sequence of amino acids |
Which enzyme begins the digestion of proteins? | pepsin |
Word equation for hydrolysis of protein | Protein + Water -> Amino Acids |
How are proteins hydrolysed? | Peptide links are identified and broken water is intorduced amino acids are built |
How are amino acids hydrolysed in a lab? | Through reflux with concentrated hydrochloric acid for several hours |
How can Hydrolysed proteins be analysed? | Through chromatography |
What are the two types of protein? | Fibrous - long, fibre like structure, sheets Globular - spiral chains, 3d appearance |
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