1. What is the chemical formula for urea?
a) NH3
b) NH2COONH4
c) NH4OH
d) CO2H
2. How is urea formed in the body?
a) From the breakdown of amino acids
b) From the breakdown of carbohydrates
c) From the breakdown of fats
d) From the breakdown of nucleic acids
3. What is the primary function of urea in the body?
a) To regulate blood sugar levels
b) To transport oxygen in the blood
c) To remove excess nitrogen from the body
d) To assist in muscle contractions
4. What is the name of the enzyme responsible for the conversion of ammonia to urea in the liver?
a) Urease
b) Glutamine synthetase
c) Ornithine transcarbamylase
d) Carbonic anhydrase
5. What is the most common use of urea in industry?
a) As a fertiliser
b) As a fuel
c) As a food additive
d) As a cleaning agent
6. How is urea produced on a large scale in industry?
a) By fermentation of glucose
b) By chemical synthesis
c) By distillation of crude oil
d) By extraction from natural sources
7. What is the melting point of urea?
a) -34°C
b) 0°C
c) 34°C
d) 100°C
8. What is the solubility of urea in water?
a) Insoluble
b) Slightly soluble
c) Moderately soluble
d) Highly soluble
9. What is the pH of a solution of urea in water?
a) Acidic
b) Neutral
c) Basic
d) It depends on the concentration of urea in the solution
10. What is the toxicity of urea to humans?
a) Extremely toxic
b) Moderately toxic
c) Slightly toxic
d) Not toxic at all
Answers:
- b
- a
- c
- c
- a
- b
- a
- d
- b
- d