Question

In: Biology

• What is a structural gene? • What is a regulatory sequence? • What is a...

• What is a structural gene?
• What is a regulatory sequence?
• What is a promoter? What is an operator?
• What are the regulatory GENES and their promoters? What is a repressor? Are these genes considered
part of the operon? Are they always located next to the genes they control?

Solutions

Expert Solution

a. A structural gene contains a coding sequence that specifies a protein. It codes for a diffusible product i.e. trans-acting production (RNA/protein)

b. A regulatory sequence is a cis-acting element. It does not code for any diffusible product. However, it regulates the expression of a linked sequence. EX: promoter and operator

c. A promoter is a cis-acting element that acts in a direction dependent manner. It is the binding site for RNA polymerase to initiate transcription.
An operator is a cis-acting element that acts in a direction dependent manner. It is the binding site for repressor protein to inhibit transcription.

d. Regulatory genes bind to the cis-elements of other genes and activate/repress their expression. An activator activates gene expression. A repressor inhibits gene expression.
These genes are generally located near the operon. However, they are considered as part of the operon as they are expressed independently of the operon.

gladiator answered 2 years ago
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