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
Taya2010 [7]
3 years ago
13

Bacterial form that is in a state of slow metabolism and that does not reproduce

Biology
1 answer:
Salsk061 [2.6K]3 years ago
5 0
The bacterial form that is in a state of slow metabolism and that does not reproduce <span><span>is endospore.
It is a dormant state of bacteria when bacteria reduce itself. Endospores enable bacteria to lie dormant for a very long period. Endospores are extremely resistant (to ultraviolet radiation, desiccation, high temperature, freezing)</span> <span>can survive without nutrients. </span></span>
You might be interested in
What is the biggest challenge to the successful use of pig organs in human transplants?
iragen [17]
The biggest challenge is rejection. Sometimes the human body will not accept the pig organ unfortunately. 

Hope this helped. Good luck !
5 0
2 years ago
Read 2 more answers
Why is it colder in winter than summer?
iragen [17]
One reason is because the short days and long nights prevent the earth from warming up, another reason could be because the sun's rays in winter are more spread out thus minimizing the amount of energy
6 0
2 years ago
Read 2 more answers
Describe the probable effects on gene expression in the lac operon of each mutation: a. Mutation in the lac operator that delete
Stella [2.4K]

Answer:

a. Reduces represor binding.

b. Constitutive expression of the operon.

c. Stronger promoter if it is more similar to the consensus sequence. Weaker promoter if less similar.

Explanation:

The lac operon is an operon required for lactose transport and metabolism in enteric bacteria such as <em>Escherichia coli</em>. <u>It is regulated by glucose and lactose availability</u> and consists of the following structural genes:

  • Lac z gene: encodes the enzyme β-galactosidase, which catalyzes the hydrolysis reaction of lactose into glucose and galactose.
  • Gene lac y: encodes the protein galactoside permease involved in the transport of lactose into the bacterium.
  • Lac a gene: encodes the enzyme thiogalactoside transferase, which catalyzes the transfer of the acetyl group of acetyl coenzyme A to 6-OH of a thiogalactoside acceptor. This gene is not related to lactose metabolism.
  • Promoter: region of DNA recognized by RNA polymerase for transcription.
  • Operator: region of DNA located between the promoter and the beginning of the structural genes, which is recognized by the repressor protein Lac I.
  • Repressor gene (lac I): encodes the Lac I repressor protein, which recognizes the operator region, where it binds. It prevents the transcription of genes under the control of this promoter but stimulates the binding of RNA polymerase. When the repressor is absent (in the presence of inducer which in this case will be lactose or IPTG), RNA polymerase will begin transcription.

The lac operon is under a type of negative regulation, where genes can always be transcribed, except when the Lac I repressor protein is bound to the operon region, for which it has a high affinity. In this case, the promoter of the lac I gene is constitutive, so the Lac I protein is permanently expressed and remains bound in tetramer form to the operon region, preventing the transcription of structural genes.

Since lactose is the inducer of the operon, it is able to bind to the Lac I repressor protein and generate a conformational change that decreases its affinity for the operon region. Thus, the operon region is left free, <u>RNA polymerase can freely transcribe the structural genes and β-galactosidase can degrade lactose to glucose plus galactose</u>. <u>In the absence of lactose, the Lac I repressor protein maintains its high affinity for the operator region, preventing RNA polymerase from transcribing the structural genes</u>. In this way, the system remains closed with consequent energy savings for the bacterium.

As a final clarification, actually the true inducing molecule of the lac operon is called allolactose, an isomer of lactose obtained by a transglycosylation occasionally carried out by β-galactosidase.

a. When there is a mutation in the lac operator that deletes most of the operator, then the repressor Lac I can no longer bind and RNA polymerase will begin transcription.

b. When there is a mutation in the Lac I gene that eliminates the binding of repressor to operator, then this protein can not produce the repression so there would be a constitutive expression of the operon.

c. Since the promoter us a region of DNA recognized by RNA polymerase for transcription, if there is a mutation here it will generate a stronger promoter in the case that this part is similar to a consensus sequence (the most commonly encountered nucleotides found at a certain location). In the case that it is less similar, then it will generate a weaker promoter.

7 0
3 years ago
What quantity is equal between two solutions that are isotonic ?
bazaltina [42]

An isotonic solution is a solution in which the amount of dissolved material is equal both inside and outside of the cell. Water still flows in both directions, but an equal amount enters and leaves the cell.  Hope this helps. :)

8 0
3 years ago
Question 6
ycow [4]

Answer:

Cytoskeleton

Explanation:

It provide mechanical support that enables cells to carry out function like division and movement

3 0
3 years ago
Other questions:
  • What is the difference between osmosis and diffusions?
    5·2 answers
  • Which organ directly interacts with the blood to remove carbon dioxide and provide oxygen?
    5·1 answer
  • A soil deficient in humus would ____________.
    13·1 answer
  • The human reproductive systemA) is as essential to the survival of an individual as all other anatomic systems.B) remains functi
    7·1 answer
  • Plants alter their generations by switching between
    10·2 answers
  • A?
    6·1 answer
  • which atom is found in all organic substances but rarely in organic substances? a.carbon b.oxygen c.nitrogen d.phosphorus
    15·2 answers
  • What is the meaning of life.
    6·1 answer
  • Which of th following processes releases carbon dioxide as waste
    7·1 answer
  • Carolina was always hungry. After visiting the doctor, she was told that her _____ was producing too much insulin, causing low b
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!