Pepsin, a common enzyme found in the stomach, is most active at ph values between 0.5 and 2.5. it works slowly between ph values of 2.6 and 3.4. beyond a ph of about 3.5, it becomes completely inactive. why does this happen? a) the enzyme inactivates because it melts into a liquid when it is not at the right ph. b) the protein chain in the enzyme is denatured, permanently inactivating it as the ph approaches 7. c) the enzymes slow down, because changing the ph changes the temperature as well, and affects the reaction. eliminate d) the enzyme's active site contracts into the wrong shape, but this is always reversible if the right ph is restored.

Apart of an ecosystem that can restrict the growth of a population is referred to as

Ascientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas which group of statements best describes all of the materials he is using in the investigation?

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