The active site of an enzyme is generally a a) pocket/cleft b) indentation c) hole d) tube e) passageway

answer; ///(b) it is composed of four protein chains and four heme groups;

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this