1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Svet_ta [14]
4 years ago
12

Describe how the lac operon functions, and explain how it permits E. coli to produce the enzymes needed to break down lactose wh

en it is present in the bacterium.
Biology
1 answer:
KiRa [710]4 years ago
5 0
<span>The lac operon has three genes that encode for proteins that break down lactose into galactose and glucose. When there is no lactose around, it wouldn't make sense for the prokaryote to make these proteins as it would be a waste of energy. So, when there is no lasctose around, the lac repressor binds the operator region of the operon, which inhibits RNA polymerase's ability to bind and start gene expression. However, when lactose is available, it binds to the lac repressor and deactivates it via allosteric inhibition. Once the lac repressor is gone, the genes can be transcribed into mRNA which can be translated into proteins which can go and break down the lactose. </span>
You might be interested in
. While Carl Linnaeus catalogued nearly all known organisms of his day, which major group of organisms did he not account for in
Blababa [14]

Answer:

Single-cell organisms

Explanation:

In 1735, Linnaeus introduced a classification system with only two kingdoms: animals and plants. Linnaeus published this system for naming, ranking, and classifying organisms in the book "Systema Naturae". In the epoch that Linnaeus created this system, single-cell organisms such as bacteria and protists were almost unknown. In 1866, E. Haeckel added a category including both bacteria and protozoa, thereby adding a category formed by single-cell organisms (different from animals and plants). During the 1900-1920 period, bacteria were classified as a separated kingdom named 'prokaryotes'. The current three-domain classification system was introduced by C. Woese in 1990. In this system, all forms of life are divided into three different domains: archaea, bacteria, and eukaryote domains (this last composed of protists, fungi, plants and animals).

6 0
3 years ago
Which organisms have the potential to reproduce?
Blababa [14]
Only unicellular orgaimns I might be wrong
6 0
3 years ago
Read 2 more answers
Define acidity. How is it measured?
Aleksandr [31]

Answer:

its the level of acid in substances

you put the amount of a item into a cup and add water.

Explanation:

4 0
3 years ago
The diagram below shows some of the steps in protein synthesis.
Zinaida [17]

Answer:

According to the diagram shown, the section of DNA used to make the mRNA strand is known as a gene (option 2).

Explanation:

Gene consists of a DNA fragment that codes for the synthesis of a specific protein that defines the structural or functional trait of a living being.

When DNA is transcribed into mRNA, each section of transcribed DNA is part of a gene. The information travels to ribosomes in the cytoplasm where protein synthesis occurs.

A complete DNA molecule forms a chromosome, which contains the genes with information to define specific traits of a species.

The other options are not correct because:

<em>     1.Carbohydrate is a biomolecule that is not involved in the genetic process. </em>

<em>     3. Ribosome is where protein synthesis occurs. </em>

<em>     4. Chromosome is the complete DNA molecule.</em>

3 0
3 years ago
Air exits through nose or mouth.
Airida [17]
1. True
2. False
3. True
4. True
5. False
8 0
3 years ago
Other questions:
  • A mixture of sand, silt and clay that forms a good farming soil is called ______.
    5·1 answer
  • Maple trees are often tapped to extract the sap to make syrup. Which type of tissue is the aim of the tree tap?
    12·1 answer
  • The process in which one species evolves into a variety of species is called apes
    9·1 answer
  • 1. A period during which the embryo of a seed is alive but not growing is
    8·2 answers
  • Active transport requires energy because it usually involves the movement of
    7·2 answers
  • Biology <br> which is the best hypothesis that the experiment could test ?
    9·1 answer
  • Elements can combine to form molecules, like O2 or CO2. Elements combine to form molecules and these elements are joined togethe
    7·2 answers
  • Darwin explained that all life came from ________________
    8·1 answer
  • All herbivore species are small such as insects and would not be able to have massive muscular bodies.
    13·2 answers
  • Why do scientists focus on an animal's cognitive abilities rather than its "intelligence" when studying animal behavior?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!