The main nitrogen-containing waste excreted in urine by humans is
A. AMMONIA
B. UREA
C. URIC ACID
D. NUCLEOTIDE
Select your answer:
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Immunity › ViewWhich of the following statements is incorrect?
A. Active immunity is the stimulation of the immune system to produce antigen-specific antibodies.
B. Vaccines produce immunological memory similar to that acquired by having the natural disease.
C. The most common way to acquire passive immunity is to have the natural disease.
D. Killed forms of a microorganism can act as an antigen.
Macro and Micro Nutrients › View
The role of fibre is to
A. Strengthen teeth and bones
B. Keep the digestive system healthy
C. Provides the body with energy
D. Repairs muscle and tissues