During transcription, what happens to the RNA polymerase if a repressor protein attaches to the operator? A. It begins transcription.
B. It begins translation.
C. It cannot attach to enzyme 1.
D. It cannot attach to the promoter.

phylogenetic tree is the tree of life or evolution tree. it shows the different branches of evolution. the sequence goes like tissues - coelom - backbone - endoskeleton - segmentation

this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.

they deliver oxygen to the blood

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.