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
salantis [7]
4 years ago
6

Genetic regulation in prokaryotes can involve alterations in RNA secondary structure. What phenomenon occurs in the trp operon t

hat involves such alterations?
A) transcription
B) capping
C) polyadenylation of the 3′ end of the mRNAs
D) intron processing
E) attenuation
Biology
1 answer:
Likurg_2 [28]4 years ago
6 0

Answer:

E) attenuation

Explanation:

Attenuation is a regulatory mechanism in which the transcription is initiated normally but is halted before transcription of operon genes. The trp operon has a leader sequence present at the 5' end of the mRNA. Sequences 3 and 4 of the leader sequence serve as an attenuator by forming a stem-loop structure. Base pairing of sequences 2 and 3 does not allow the formation of the attenuator and the transcription continues.

When the tryptophan levels are high, the sequence 1 is translated and the translation of sequence 2 starts before transcription of sequence 3. The continued transcription allows the formation of attenuator by sequences 3 and 4. When the tryptophan levels are low, the tryptophan code of sequence 1 is not translated by ribosome leading to the base pairing of sequences 2 and 3 to prevent attenuation.

You might be interested in
Which is true of drugs that decrease membrane permeability to sodium ions? some are used as local. they may block nerve impulses
Ivan
<span>The right answer is: they work by blocking sodium channels in the cell membrane.

These drugs are used systemic and not local.
</span>they block sodium channels in the cell membrane in the synapses between neurons, and not along axons. 
Many drug acts by blocking sodium channel, in a specific location, like antiepileptics in the nervous system, and digoxin and antiarrhythmic in the heart.
7 0
3 years ago
Why is RNA required to make proteins?
Nostrana [21]
Ribosomal RNA (rRNA) associates with a set of proteins to form ribosomes. These complex structures, which physically move along an mRNA molecule, catalyze the assembly of amino acids into protein chains. They also bind tRNAs and various accessory molecules necessary for protein synthesis.
4 0
4 years ago
Read 2 more answers
A client takes a home pregnancy test. While she is waiting to read the results, her phone rings. When she gets off the phone 15
Contact [7]

Answer:

Yes a false positive result will be read

Explanation:

Instructions on most pregnancy tests will tell you to read the results in a certain amount of time, usually from a couple of minutes. So you may take a pregnancy test and read it within the above time period as negative.

If you happen to keep the test around to look at later, you may notice that after that allotted time, the test now appears to have a positive result. This is called an evaporation line. It is not indicative of a positive pregnancy test.

What is Evaporation Lines?

Evaporation lines happen when the urine that was on the test area starts to dry out and evaporate. The chemical composition of that particular urine sample has now changed since that urine sample evaporated, sometimes causing the test to show a positive line

4 0
4 years ago
Read 2 more answers
The portion of the Earth that supports the existence of living things is the
Temka [501]

Answer:

Biosphere

Explanation:

6 0
3 years ago
Which of the following led to the discovery of cells?
UNO [17]

Answer:

Microscopes

Explanation:

cells were seen on the microscope.

3 0
3 years ago
Other questions:
  • A patient underwent debridement of the acromion, subacromial bursectomy, division of the coracoacromial ligament, and an abrasio
    12·1 answer
  • In one town, some people support a proposal to
    10·1 answer
  • Nonnative species can harm some populations in an ecosystem why
    12·1 answer
  • PSYCHOLOGY
    15·1 answer
  • In contrast to behaviorism, recent learning theory has emphasized the role of –: the conditioned stimulus helps an animal – the
    11·1 answer
  • Im giving 52 points! PLEASE HELP!!!! I WILL BE REALLY THANKFUL!
    12·2 answers
  • Where do animals get carbon from during the carbon cycle
    12·2 answers
  • What is the correct term for a light particle?
    11·2 answers
  • Which organisms are prokaryotes?<br><br> bacteria<br><br> archaea<br><br> sunflowers
    8·2 answers
  • Plzzz I want to know​
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!