Chemistry for Biologists

Excretion and the liver

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

 

RSC