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
Katarina [22]
3 years ago
5

Which of the following BEST describes transcriptional regulation of the lac operon in E. coli?

Biology
1 answer:
Alexeev081 [22]3 years ago
7 0

Answer:

E. On in the presence of lactose and absence of glucose

Explanation:

Expression of lac operon synthesizes the enzymes required for catabolism of lactose sugar. When both glucose and lactose are available, glucose is preferred as a nutrient and the lac operon is not expressed.

Lac operon is expressed only when glucose is absent in the medium and lactose is present. If any of the two conditions deviate, the operon is not expressed.

In the absence of glucose and the presence of lactose, the repressor is rendered inactive to bind to the operator. RNA polymerase enzyme is free to bind to the promoter and continue the process of transcription.

The reduced levels of glucose increase the cAMP levels which in turn bind to the Catabolite activator protein (CAP). CAP is a positive regulator that binds to the promoter to facilitate the transcription of the operon by RNA polymerase.

You might be interested in
Which is a FALSE statement about the blood that leaves the heart through the pulmonary artery?
miv72 [106K]
I think the answer is A..... ps c and d are the same
8 0
3 years ago
Read 2 more answers
Carrying capacity is the
jonny [76]

Answer:

C. Mean

Explanation:

sir / ma your question isn't clear. That aside.

to know how population size of species affect the sustainability we find the mean carrying size(just a guess)

5 0
1 year ago
Do plants or animals adapt to their environment faster?
Jlenok [28]

Answer:

Plants

Explanation:

3 0
3 years ago
Read 2 more answers
When individuals of the same species are reproductively isolated, genetic differences may accumulate in sufficient number so tha
sdas [7]

Answer:

macroevolution

Explanation:

Macroevolution occurs due to the genetic differences accumulates in the population of the same species which gets reproductively isolated from the older population and got different environments and resources to live.

Macroevolution leads to the creation of a new species over a long period of time because of the genetic difference that occurs due to mutation in the gene in the population who got reproductively isolated. So the new species evolved from the macroevolution.

6 0
3 years ago
Would you use an observational, experimental, or modeling approach to study a rare, endangered bird species
son4ous [18]

Answer:

The correct answer would be - observational approach.

Explanation:

Observation approach is the research technique that involves the observation  of the subject or participates behavior in their natural habitat or state. This will be one of best approach to study.

Similarly when characterizing new findings various aspect of  experimental, Observational details or modelling approaches will help in identification , classification and nomenclature. However, in comparison to experimental and modeling approach is more appropriate method for the rare endangered species.

Thus, the correct answer would be - observational approach.

3 0
3 years ago
Other questions:
  • Pathology examination of tissue removed during a pancreas biopsy. report code _____.
    14·1 answer
  • What were the old models of the solar system?
    12·1 answer
  • 1. Mike injured his knee while playing. Examination revealed that the injured area was red, swollen, and warmer than the surroun
    15·1 answer
  • What is meant by a balanced equation?
    8·2 answers
  • In terms of their length of effect, endocrine messages are to _____ as neural messages are to _____.
    7·1 answer
  • Which of the following explain why sunlight is important to aquatic ecosystem?. -Sunlight provides a source of heat energy to in
    10·1 answer
  • What is the spreading of tumor cells to distance parts of the body via blood and lymph referred to as?
    11·1 answer
  • A. two DNA molecules containing the same genetic code as the original DNA molecule are produced.
    11·1 answer
  • The kidneys are an essential organ for which system?
    10·1 answer
  • since cells are filled with water, what would happen to biologically important molecules if they were held together with ionic b
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!