Chemistry for Biologists

Excretion and the liver

1. The amino group is reduced by:
adding carbonyl groups
adding nitrogen groups
adding oxygen molecules
adding hydrogen molecules
2. Urea is produced when:
ammonia reacts with protein in the presence of enzymes
ammonia reacts with carbon dioxide in the presence of enzymes
ammonia reacts with carbon dioxide in the presence of enzymes
ammonia reacts with carbon dioxide in the presence of water
3. Enzymes
will change colour at the end of a reaction
become more acidic at the end of a reaction
are more basic at the end of a reaction
remain unchanged at the end of a reaction
4. The production of ammonia is potentially:
useful to the body as it aids digestion
useful to the body as it stimulates the production of growth hormones during puberty
harmful to the body and must be removed quickly
harmful to the liver and must be transferred to the stomach quickly
5. The amino acid is oxidised by:
amino groups
adding hydrogen molecules
adding carbonyl groups
adding oxygen molecules
6. The bodies of mammals are unable to store:
blood
amino acids
fats
carbohydrates
7. Deamination is the removal of:
oxygen
carbonyl groups
amino groups
hydrogen
8. Once in the liver amino acids are absorbed by:
muscle cells
nitrogen cells
blood cells
liver cells
9. Excretion is the removal of:
fats from proteins
toxic substances from the body
DNA from cheek cells
hair from the body
10. Nitrogenous compound are compounds that contain:
carbon atoms
sulfur
water molecules
nitrogen

 

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