My daughter found a recently hatched cow bird egg that appeared to be abandoned by the mother. She and my husband hand fed and cared for it until it could fledge (fly away). This same cowbird kept returning to our deck and would land on my husband's shoulder. It just would not go away and find a mate. This is a real life example (I have pictures) representing imprinting. a) trueb) false

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.

digestion

it excretes wastes

b. climate change will cause an increase in biodiversity of all ecosystems.

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