The expression of the lac operon in an e. coli cell missing the gene that encodes for the lac repressor will: increase when lactose is present. decrease when lactose is present. decrease when glucose is present. increase when glucose is present.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg