Chemistry for Biologists

Excretion and the liver

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

 

RSC