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
Sonbull [250]
2 years ago
13

What is the regulatory mechanism that allows e.coli to ignore lactose when glucose is present?

Biology
1 answer:
Dovator [93]2 years ago
3 0
Answer:
              The regulatory mechanism that allows E.coli to ignore lactose                           when glucose is present is controlled by Lac Operon. 

Explanation:

                    Lac operon is inducible and and normally turn off. It contain genes responsible for lactose metabolism and expressed when lactose is present and glucose is absent. 

Structure of Lac Operon:
                                          Lac operon is composed of following parts as shown in the figure:

1. Catabolic activator protein (CAP):
                                                              It acts as glucose sensor and activate transcription of operon through hunger signal (cAMP) when glucose level is low. 

2. Promoter:
                   It is binding site for RNA polymerase enzyme, that start transcription.

3. Operator:
                  It is binding site for Lac repressor protein. when there is no need of lactose repressor protein bind to promoter and stop transcription. 

4. Structural genes:
                                  This region is composed of Lac Y, Lac Z and Lac A genes. These genes are transcribed into lactose when needed. 

Regulatory mechanism 
                                    When glucose is present, no cAMP is made. CAP can't bind DNA with out cAMP, so transcription occur at only low rate or stop. 

You might be interested in
where does most of the energy that drives metabolism and most of the cells activities come from(also called a cells "energy curr
loris [4]
Adenosine Triphosphate (ATP)
7 0
3 years ago
20 pts. The color of your eyes is an example of an inherited trait. These are the traits that are passed down to you from your p
kaheart [24]

Answer:C) Traits like this are determined by the genes passed from parents to their children.

Explanation: Every trait in an organism is controlled by a pair of gene. A gene that controls a trait usually have two alleles. During fertilization, for every pair of gene one allele is inherited from the mother while the other allele is inherited from the father and the two alleles come together to form a pair of gene. Every trait in an organism is determined by genes that are passed from the parents to the offsprings.

8 0
2 years ago
This part of the nucleotide forms a hydrogen bond with its complementary part on dna
xxTIMURxx [149]

Answer: Base pairs are formed when adenine forms a hydrogen bond with thymine, or cytosine forms a hydrogen bond with guanine. The second part of a nucleotide is the phosphate, which differentiates the nucleotide molecule from a nucleoside molecule.

Explanation:

7 0
3 years ago
. The average adult (like Hank) is _________% water, ________% protein, _______% fat, _______% minerals, and _______% carbohydra
kiruha [24]

Answer:

1. 62 percent water, 16 percent fat, 16 percent protein, 6 percent minerals, and less than 1 percent carbohydrate, along with very small amounts of vitamins and other miscellaneous substances.

2. Food.

3. Catabolic, Anabolic, Metabolism

3 0
3 years ago
What is most likely the reason Earth moves in an orbit around the sun?
IrinaVladis [17]

I'm almost sure your answer is going to be "Because the sun's mass creates a gravitational force that pulls earth towards it."

correct me if I am wrong.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Large or charged molecules enter the cell trough
    15·1 answer
  • The theories on the expansion of the universe ?
    6·1 answer
  • Is knowing the abo blood type of a potential blood donor enough to determine a suitable match? explain your answer?
    13·1 answer
  • Some fungi secrete substances that are toxic to bacteria that compete with them for food. Scientists have used their knowledge o
    7·1 answer
  • Many living things depend on the ocean currents for food, transportation, and a suitable climate.
    6·2 answers
  • 3. What is the process where excess
    10·2 answers
  • The most common type of cartilage, named for its glassy appearance, is fibrocartilage. hyaline cartilage. elastic cartilage. ret
    8·1 answer
  • Only about 10 percent of the energy in an organism is passed on to the next level of a food chain. look at this food chain: gras
    8·2 answers
  • What are the genotypes of the parents represented in this Punnett square?
    8·2 answers
  • NOT SURE IF THIS IS RIGHT PLEASSSEEEEWEEE HELPP
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!