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Excretion and the liver
1.
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
2.
The amino group is reduced by:
adding carbonyl groups
adding nitrogen groups
adding oxygen molecules
adding hydrogen molecules
3.
Deamination is the removal of:
amino groups
hydrogen
oxygen
carbonyl groups
4.
The amino acid is oxidised by:
amino groups
adding hydrogen molecules
adding carbonyl groups
adding oxygen molecules
5.
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
6.
The production of ammonia is potentially:
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
useful to the body as it aids digestion
7.
Nitrogenous compound are compounds that contain:
water molecules
carbon atoms
nitrogen
sulfur
8.
Once in the liver amino acids are absorbed by:
liver cells
muscle cells
nitrogen cells
blood cells
9.
The bodies of mammals are unable to store:
blood
fats
carbohydrates
amino acids
10.
Excretion is the removal of:
toxic substances from the body
DNA from cheek cells
fats from proteins
hair from the body
