54. where would you most likely find a glacier? low elevation areas near 20 degrees latitude high elevations and near 60 degrees latitude in the desert australia

High elevations and near 60 degrees latitude

Explanation:

The glaciers need special conditions to form. They need very cold and relatively dry climate throughout the whole year. This type of conditions can be found only on the high elevations, and on the high latitudes. Depending on the latitude, the elevation on which a glacier can form goes up or down. The elevation needed at the low latitudes is higher because it is warmer, while on the mid-latitudes and higher latitudes it is lowering because it is colder. The high latitudes provide suitable conditions for glaciers to exist throughout the whole year, as it is either constantly winter, or it is winter for 10-11 months of the year.

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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.