Answer:
C. repressible
Explanation:
The trp operon in bacteria is a repressible operon. The regulatory gene codes for repressor protein. In the presence of tryptophan, the repressor (inactive) binds with tryptophan and gets activated. This active repressor attaches with operator and prevent polymerase to bind and thus inhibiting transcription of genes in the operon.
The mutant strain cannot attach to operator (trpO+) but it can make dimers. As the operator is mutated so it prevent binding of repressor to operator. Thus, expression of the trp operon is repressible.
Water through a cell membrane.
What are the five phases of the cell cycle? ... What would happen if the cell did not have spindle fibers? Without spindle fibers, the sister chromatids would not separate, and each daughter cell would not receive a complete set of genes. Compare cell division in prokaryotic cells with cell division in eukaryotic cells.
The term is enzymes. The lactase enzyme is produced by many organisms and is used for the breakdown of lactose, in order to utilize whole milk. People who lack lactase, are not able to utilize and become lactose-intolerant.
In humans, Lactase is present in the brsuh border of the small intestines. It is a beta-galactosidase enzyme and hydrolysis the disaccharide lactose into glucose and galactose monomers. Commercially, it is isolated from the yeasts. to cure lactose-intolerance.