In general, operons that encode the enzymes of a biosynthetic (anabolic) pathway (such as the trp operon) are and those encoding the enzymes of a catabolic pathway (such as the lac operon) are

a. repressible; inducible
b. inducible; repressible
c. permanently on ; permanently off
d. permanently off; permanently on
e. easily mutated; resistant to mutations

Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.