Question

Drag the terms on the left to the appropriate blanks on the right to complete the sentences.

The enzymes catalyzing____ and_____ metabolism are produced from genes has been whose transcription is activated only when these sugars are present____ and depleted. Gene transcription from the bacterial lac operon is induced by the binding of the This process opens the lac_____ metabolite_____, to the_____ and activates transcription Induction of operator and____ region for ____and activates transcription of GAL genes by_____ is more indirect The y GAL genes have their east transcription activated by binding of _____protein to _____elements affiliated with each gene _____binding is induced when it is released from ______,which is caused by the binding of____ to Gal80, which occurs only when Gal3 is bound to_____ and cellular_____has been depleted.
a. lactose
b. allolactose
c. glucose
d. galactose
e. RNA polymerase
f. operator
g. repressor protein
h. enhancer
i. promoter
j. Gal3
k. Gal4
l. Gal80
m. UAS
n. inducer

Answer 1

The lactose and galactose metabolism enzyme genes are only transcribed when these sugars are present and glucose is depleted, involving the lac operon for lactose and GAL genes for galactose, activated by different mechanisms with the involvement of specific proteins and inducers.

Step-by-step explanation:

The enzymes catalyzing lactose and galactose metabolism are produced from genes whose transcription is activated only when these sugars are present and glucose is depleted. Gene transcription from the bacterial lac operon is induced by the binding of the metabolite allolactose, to the repressor protein and activates transcription. This process opens the lac operator region for RNA polymerase and activates transcription of GAL genes by galactose is more indirect.

The yeast GAL genes have their transcription activated by binding of Gal4 protein to UAS (upstream activating sequences) elements affiliated with each gene. Gal4 binding is induced when it is released from Gal80, which is caused by the binding of galactose to Gal80, which occurs only when Gal3 is bound to galactose and cellular glucose has been depleted.

This regulation ensures that the cell only produces the enzymes necessary for lactose metabolism when glucose is scarce and lactose is available.