Repressible operons require that binds to the repressor protein before it can bind to the operator. select one: a. the product b. a cofactor c. a coenzyme d. the substrate e. the reactant

The correct answer will be option-A

Explanation:

An operon is a group of genes arranged in series having a single promoter which gets activated by the same stimuli which together controls the specific action. The operons are common in prokaryotic bacteria which could be inducible operons or repressible operons.

The repressible operons are the operons which remain activated all the time in a bacteria but can be repressed or stop when a molecule binds the operator. The co-repressor molecule is usually the product of the operon like the tryptophan in the trp operon which binds the protein and switches off the operon.  

Thus, option-A is the correct answer.

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

the correct answer is b. possesses the characteristic of compartmentalization of organelles, wherein the organelles are bound by membranes.

explanation: