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Cfe Higher Chemistry - Unit 2: Nature's Chemistry - Proteins
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- 1Which chemical elements make up proteins?Carbon, Hydrogen, Oxygen and Nitrogen and occasionally sulphur
- 2How 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
- 3How do animals obtain their proteins for growth?Through our food
- 4Test for proteinHeat in presence of soda lime. The gas released will turn moist pH paper blue.
- 5What are proteins used for in the body?Cell Structures - membranes
Hormones - insulin
Body Structures - hair,nails
Enzymes
Muscle fibers
Binding proteins - haemoglobin - 6How many functional groups does an amino acid have?2 - amino group (NH2) and a carboxl group (COOH)
- 7How 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.
- 8What is a peptide?a unit made up of a small chain of amino acids (tripeptide - 3 amino acids)
- 9What are two alternative names for proteins?Polyamides and polypeptides
- 10How many amino acid molecules are in a typical protein?2-3 hundred
- 11What is this?Amide link
- 12Why are some amino acids known as "essential"?Because we cannot make them in out bodies, they must be consumed through our food.
- 13What are the 4 steps of protein hydrolysis?Protein foods
Breaking down proteins
Absorbing amino acids
bulilding proteins - 14Describe the Breaking down of proteinsAcids and enzymes in the digestive system help break down the peptide
- 15Describe the Absorbing of amino acidsWhile 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.
- 16Describe the building of proteinsAmino acids are joined together in a different sequence, changing the final protein
- 17What determines the type of protein built?the sequence of amino acids
- 18Which enzyme begins the digestion of proteins?pepsin
- 19Word equation for hydrolysis of proteinProtein + Water -> Amino Acids
- 20How are proteins hydrolysed?Peptide links are identified and broken
water is intorduced
amino acids are built - 21How are amino acids hydrolysed in a lab?Through reflux with concentrated hydrochloric acid for several hours
- 22How can Hydrolysed proteins be analysed?Through chromatography
- 23What are the two types of protein?Fibrous - long, fibre like structure, sheets
Globular - spiral chains, 3d appearance
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- Cfe Higher Chemistry - Unite 2: Nature's Chemistry - Proteins
- Creado por
- scarlettjaynem · ene 2015
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- 13 dic 2016
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