When is gene expression blocked in the lac operon system? RNA polymerase begins transcribing the genes.

The repressor protein blocks the genes from making mRNA.

The repressor protein destroys the genes required to produce enzymes.

Lactose binds to the repressor and changes its shape.

Construct an explanation about the function of mitosis for multicellular organisms

Which of the following describes a boom period? a. as one population increases, another population decreases. b. as one population increases, the other population also increases. c. as one population decreases, another population increases. d. as one population decreases, another population also decreases

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen