Which of the following statements regarding rna polymerase ii, the enzyme that synthesizes mrna in eukaryotic cells, is true?
a. rna polymerase ii converts between an active form that binds to a promoter and an inactive form that cannot bind to a promoter.
b. rna polymerase ii can bind to a promoter region and initiate transcription either alone or in conjunction with transcription factors.
c. rna polymerase ii requires other transcription factors in order to bind to a promoter site.
d. rna polymerase ii is blocked from initiating transcription when transcription factors bind to a promoter region.

10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii

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.

How did the work of farmers and breeders in england influence the work of charles darwin