Atypical raindrop is much more massive than a mosquito and falling much faster than a mosquito flies. how does a mos quito survive the impact? recent research has found that the collision of a falling raindrop with a mosquito is a perfectly inelastic collision. that is, the mosquito is swept up by the raindrop and ends up traveling along with the raindrop. once the relative speed between the mosquito and the raindrop is zero, the mosquito is able to detach itself from the drop and fly away.

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.

when it is at an intermediate population density