Which one of the following accurately describes the lac operon?
a. the repressor protein binds to the operator when lactose is present.
b. the repressor is freed from the operator when lactose is present.
c. rna polymerase transcribes the lac genes when lactose isn't present.
d. rna polymerase is prevented from transcribing the lac genes when lactose is present.

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the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.