When does translation begin?
a. when rna polymerase binds to the tata box
b. when the subunits of the ribosome assemble into a functional ribosome
c. dna polymerase carries out translation after the ribosome forms
d. when there are enough tdna's to carry all the amino acids

sadness is not good

explanation:

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.