"apo-repressor of trp operon is an inactive form of repressor." justify this statement. select one of the options below as your
a. apo-repressor can only bind to the operator site of trp operon when a tryptophan molecule, which is a co-repressor, binds to it.
b. apo-repressor acts as an inducer if there is a lesser amount of tryptophan present in the surrounding medium and remains inactive when sufficient tryptophan is present.
c. apo-repressor cannot bind to the operator site of trp operon if a tryptophan molecule, which is a co- repressor, binds to it.

Female luna moths (actias luna) attract males by emitting chemical signals that spread through the air. a male hundreds of meters away can detect these molecules and fly toward their source. the sensory organs responsible for this behavior are the comblike antennae visible in the photograph shown here. each filament of an antenna is equipped with thousands of receptor cells that detect the sex attractant. based on what you learned in this chapter, propose a hypothesis to account for the ability of the male moth to detect a specific molecule in the presence of many other molecules in the air. what predictions does your hypothesis make? design an experiment to test one of these predictions.