Both prokaryotes and differentiated eukaryotic cells express of their genes at any given time in the process called a. all; translation b. a small number; translation c. a small number; transcription d. all; transcription e. a large number; transcription

c. a small number; transcription

Explanation:

We call transcription the process in which RNA is synthesized from a DNA template. We can divide the RNA synthesis process into three important steps in eukaryotes (initiation, stretching and termination) and four steps in prokaryotes (recognition, initiation, stretching, termination). The transcription process occurs in both eukaryotic and prokaryotic cells through a DNA template that is formed by a small number of cells.

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.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.