A scientist observes a previously unknown species. It is multicellular and has specialized sense organs. Based on the diagram of the kingdom levels below, this organism should most likely be classified in what kingdom? A

Animalia

B

Fungi

C

Plantae

D

Protista

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products