If there is no lactose present, how does bacteria respond? The gene for beta-galactosidase turns on. The gene for beta-galactosidase turns off. Lactose is produced. Beta-galactosidase production increases.

The gene for beta-galactosidase turns off.

Explanation:

The gene that codifies the beta-galactosidase enzyme is part of the lac operon, which also contains two other genes that produce enzymes involved in the metabolization of lactose.

Between glucose and lactose, the bacteria will preferentially use glucose as an energy source. On the other hand, lactose is a dimer, and thus a series of enzymes are needed to process lactose before its use as an energy source.

If there is no lactose present, the genes contained inside this operon are turned off (the operon is repressed).

The gene for beta-galactosidase turns off

Explanation:

Beta-galactosidase is an enzyme which cleaves lactose molecule into glucose and galactose.

The lactose-metabolizing enzymes are encoded by the lac operon. The lac operon contains three genes:

In an absence of lactose, Lac repressor binds to lac operator. And as a result of this binding, transcription of lac operon will be prevented. Hence all the above mentioned genes of the lac operon will be repressed or will be turned off.

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

hope this , have a good day. c;

the missing space is phylum