When the body breaks down proteins (polymers of amino acids), whether because of famine or because there are too many amino acids in the body, the amino group containing nitrogen must be removed and discarded. This is discarded from a mammal's body in the form of .

Urea

When the body breaks down proteins (polymers of amino acids), whether because of famine or because there are too many amino acids in the body, the amino group containing nitrogen must be removed and discarded. This is discarded from a mammal's body in the form of urea.

Explanation:

In mammals such as humans, amino nitrogen is excreted as urea. Hence, mammals are referred to as ureotelic animals.

Unlike mammals, amino nitrogen is excreted as ammonia in aquatic animals while as uric acid in reptiles and birds.

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explanation:

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.