In bacteria, single polycistronic mrna encodes for:
a. a single enzyme although there are many in the metabolic pathway.
b. multiple enzymes of the particular pathway.
c. a single mrna which is split into multiple mrnas before translation.
d. a single peptide with multiple catabolic sites.
e. none of the above.

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary