An active repressor protein . Multiple Choice binds to the DNA molecule and promotes transcription initiation binds to an inducer to activate it binds to the DNA molecule and prevents transcription is a structural protein binds to the RNA polymerase, preventing messenger RNA synthesis

i believe it would be c: tons.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

answer; synapse;