The reaction shown is a key step in tryptophan bio synthesis.

(b) provide a mechanism, using curved-arrow notation, for the fragmentation
reaction shown above. the x-ray crystal structure of the enzyme that catalyzes this
reaction reveals that a glutamate residue is suitably positioned to serve as a general
acid-general base, and an aspartate residue serves as an electrostatic catalyst. indicate the roles of these residues in you catalytic mechanism.

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.