The lactose operon, as well as other operons with genes that encode enzymes for the utilization of different carbohydrates, is regulated by the concentration of crp-camp in the cell. one of the consequences is that the cell can have a hierarchy of preferences for the utilization of various carbohydrates. glucose is at the top of the hierarchy, and when glucose is present in sufficient concentration, the level of crp-camp in the cell is low, and none of the other operons are fully induced even if their associated carbohydrate is present. as the glucose is depleted, the level of crp-camp increases, and each operon in turn becomes fully inducible according to its ranking in the hierarchy. the least preferred carbohydrates require the highest concentration of crp-camp to be fully induced. suppose the order of preference for sugars were, from most to least preferred after glucose, maltose, lactose, cellobiose, trehalose, and raffinose. which operon would require the highest level of crp-camp to be fully induced

raffinose

Explanation:

The least preferred carbohydrate requires the highest concentration of CRP-cAMP to be fully induced. Since the raffinose is the last in the hierarchy it will require the  tho highest concentration of CRP-cAMP. On the other hand maltose would require the lowest level of CRP-cAMP to be fully induced.

CRP is an important regulatory protein in bacteria, which binds to the promoters of the bacteria genes it controls and activates the transcription of the gene. CRP can bind for the promoter only when it is activated by cAMP.

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.