Chemistry for Biologists

Excretion and the liver

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

 

RSC