Asked Dec 10, 2019

What is lac operon? Draw and/or identify the status of the lac operon in a given set of environmental conditions and/or cell mutations.


Expert Answer

Step 1

The lac operon, otherwise called as lactose operon is an example of inducible operon. It consists of three structural genes which are necessary to acquire and process the lactose from the environment and breaking it into simple sugars like glucose and galactose. This operon is controlled by the same promotor and operator sequences. The three genes present in the lac operon are lac Z, lac Y and lac A. Each of these gene will produce a specific enzyme to process lactose.

The gene lac Z will encode for the enzyme β-galactosidase which cleaves the lactose into glucose and galactose. The gene lac Y will encode for the enzyme β-galactosidase permease which will pump β-galactosides into the cell. The gene lac A will code for the enzyme β-galactosidase transacetylase which can transfer acetyl group.

Step 2

a) Status of lac operon when lactose is unavailable:

When lactose is absent the repressor protein will bind to the operator regi...


Image Transcriptionclose

lacz lacY lacA promoter operator RNA polymerase-> repressor


Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in




Related Biology Q&A

Find answers to questions asked by student like you
Show more Q&A

Q: Question 2

A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,...


Q: Define dysentery, intoxication, and gastroenteritis. State how infection occurs in the GI tract.

A: The gastrointestinal tract is also known as alimentary canal or gut. It is an organ system inside th...


Q: researchers have noticed that some men who were sterile because their sperm cells were unable to mov...

A: Sperm is the male gamete involved in the process of sexual reproduction. Sterility in men is caused ...


Q: Which of the following unicellular organisms cause human disease? a. Euglena b. Giardia c. Nosema d....

A:  Casual organism:It is defined as a living or non-living agent which can cause a disease in the host...


Q: Nerodia sipedon insularum is a species of the Northern Water Snake that lives on islands in the west...

A: According to Hardy-Weinberg Principle: The Hardy–Weinberg principle, states that allele and genotype...


Q: what is the direction of urine movement in the kidney?

A: Kidneys are paired structure that is present on either side of the ribs in the retroperitoneal space...


Q: In a hypothetical population of 2500 people, 2275 people have brown eyes and 225 people have blue ey...

A: According to Hardy-Weinberg equilibrium, the frequency of alleles in a population can be represented...


Q: describe the location and function of the peritoneum

A: The main body cavity that is present inside the body surrounding the digestive tract and other essen...


Q: An enzyme catalyzes a reaction in which substrate A is cleaved into two products, P and Q. In the ca...

A: As you have posted question with multiple subparts, we will answer the first question for you. If yo...