Test
Enzymes
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Preguntas del test (14)
1Protein molecules are made up of long chains of amino acids. These long chains are folded to produce a specific shape that enables other molecules to fit into the protein.
- AVerdadero
- BFalso
2Proteins act as:
- AHormones.
- BProtection.
- CStructural components of tissues such as muscles.
- DCatalysts.
- EThe foundation of food molecules.
- FEnzymes.
3Catalysts decrease the rate of reaction.
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4The shape of an enzyme is vital for its function.
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5Select the correct statements.
- ALipase works best in the stomach where hydrocholoric acid keeps the environment acidic.
- BAmylase works best in the stomach where hydrocholoric acid keeps the environment acidic.
- CLipase works best in the small intestine where hydrocholoric acid keeps the environment acidic.
- DLipase works best in the small intestine where bile (made in the liver) keeps the environment alkali.
- EAmylase and lipase work efficiently regardless of the pH level of their surroundings.
6All enzymes work inside the body cells.
- AVerdadero
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7Where are digestive enzymes produced?
- ABy specialised cells in glands (such as the pancreas and salivary glands), the liver and in the lining of the gut.
- BBy specialised cells in glands (such as the pancreas and salivary glands) and in the lining of the gut.
- CIn the lining of the gut and the liver.
- DBy specialised cells in glands (such as the pancreas and salivary glands) and in the liver.
8Enzymes pass out of the cells of the glands in which they're made and into the gut where they come into contact with food molecules. They catalyse the breakdown of large molecules into smaller molecules.
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9Where is the enzyme amylase produced?
- ALiver.
- BPancreas.
- CSalivary glands.
- DStomach.
- ESmall intestine.
- FLarge intestine.
- GRectum.
10Where is the enzyme protease produced?
- AStomach.
- BLiver.
- CSalivary glands.
- DRectum.
- EPancreas.
- FSmall intestine.
- GLarge intestine.
11Where is the enzyme lipase produced?
- AStomach.
- BPancreas.
- CLarge intestine.
- DLiver.
- ESalivary glands.
- FSmall intestine.
- GRectum.
12The stomach also produces nitric acid. The enzymes in the stomach work most effectively in these acid conditions.
- AVerdadero
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13The liver produces bile, which is stored in the gall bladder before being released into the small intestine. Bile neutralises the acid that was added to food in the stomach. This provides alkaline conditions in which enzymes in the small intestine work most effectively.
- AVerdadero
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14 How are enzymes used in the home and in industry?
- ABiological detergents may contain protein-digesting and fat-digesting enzymes (proteases and lipases).
- BProteases are used to ‘pre-digest’ the protein in some baby foods.
- CBleach contains an enzyme that corrodes dirt and grime away.
- DCarbohydrases are used to convert starch into sugar syrup.
- EIsomerase is used to convert glucose syrup into fructose syrup, which is much sweeter and therefore can be used in smaller quantities in slimming foods.
Información
- Descripción
- (Biology) Science Test sobre Enzymes, creado por lucy.leggett el 30/04/2014.
- Autor
- lucy.leggett
- Idioma
- English
- Visitas
- 12
- Etiquetas
- Valoración
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