In laci —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? see section 18.2 (page 371) . view available hint(s) in laci —mutant cells, when there are high levels of glucose present but no lactose, how much β-galactosidase will be produced? see section 18.2 (page 371) . a low amount a great deal it depends on what other sugars are present in the growth medium. essentially none

Option D, Essentially none

Explanation:

The essential condition for lac operon to express its subsequent proteins i.e laz A, lacZ and lacY are as follows –  

a)Absence of glucose

b)Presence of Lactose.  

In fact absence of glucose is must. In case when lactose is absent and glucose is present then the lac z sub-protein whose product is  β-galactosidase is not expressed. In fact in lac z breaks down lactose into glucose and galactose in absence of glucose.  

Hence, option D is correct

they deliver oxygen to the blood

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