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
lana66690 [7]
3 years ago
6

Which of the following features of the trp operon is most essential to the process of attenuation independent of the repressor p

rotein?
The order of the structural genes, E, D, C, B, A
Allosteric modifications as a result of tryptophan binding.
The operator sequence (trpO)
The ability of sequences within the leader mRNA to pair with one another and form stem-lopp structures
Biology
1 answer:
diamong [38]3 years ago
4 0

Answer:

The ability of sequences within the leader mRNA to pair with one another and form stem-lopp structures

Explanation:

A form of feedback regulation controls the  trp operon by regulating transcription termination, a mechanism referred to as Attenuation.

-In the presence of high concentrations of tryptophan, RNA polymerase ceases transcription  shortly after initiation in a region called the leader sequence.

-If  the concentration of tryptophan is low, transcription does not  terminate until the entire operon is transcribed. The mechanism of attenuation links alternative RNA secondary structures  to transcription termination.

-Immediately after transcription,  RNA from the leader region folds into one of two alternative  secondary structures.

-One of these structures is a transcription  termination signal that stops RNA polymerase from continuing  to the end of the operon.

-The alternative structure does not  contain a transcription termination signal and allows transcription of a single mRNA that encodes all the structural genes.  

-The decision as to which of the two alternative RNA structures  formed is regulated by the concentration of tryptophan.

You might be interested in
Which best helps scientists determine the age of fossils
natima [27]
Relative dating best helps determine fossil age. It's where layers of sedimentary rock and fossils pile up on top of each other; the oldest fossils being in the bottom layer and the youngest in the top.
6 0
3 years ago
Global warming is a theory accepted by a majority of scientists.<br><br> T<br> F
Igoryamba

Answer:

t

Explanation:

6 0
3 years ago
Read 2 more answers
In species where males provide the bulk of the parental care, males are most likely to
aivan3 [116]
This question is incomplete. The options are:
<span>a. be choosy about which females they mate with.
b. be indiscriminant about which females they mate with.
c. mate with as many females as possible.
d. compete to mate with choosy females.
</span>
The answer is a: be choosy about which females they mate with. 
This is because the male would in this case be investing a lot of energy in parenting its young, and would therefore adopt a strategy of mating with one or very few females. It therefore makes sense that the male would be choosy in regards to its mate. 
5 0
3 years ago
Why is it incorrect to say the insulation 'keeps out the cold'
Sonja [21]
Because technically there is no such thing as cold
all that exists is heat
this is because heat is the rapid movement of particles, made by friction (to understand why you must delve into physics and some chemistry)
so, when you feel cold, it's really the absence of heat
so instead of "keeping the cold out", which makes no sense at all scientifically, insulation keeps the heat in.

as a side note
the feeling of cold is produced when you come in contact with an object (yes, air counts) that has less heat, or energy, than you do, You feel cold because heat (energy) from your body is being transferred to the environment. This ABSENCE OF HEAT in your body is why you feel cold
4 0
3 years ago
Read 2 more answers
A moon phase that looks like a half-circle from Earth *
Archy [21]
<h2><em>C</em><em>.</em><em> </em><em>Quarter</em><em> </em><em>moon</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em><em>.</em></h2>

6 0
2 years ago
Other questions:
  • Enzymes 2) Enzymes A) are composed of long chains of fatty acids. B) can be destroyed by variations in temperature or pH. C) are
    15·2 answers
  • Plants in a tropical rainforest usually have
    8·2 answers
  • Is dna made of repeating subunits called nucleotides?
    7·1 answer
  • Which of the following is a chemical property of water?
    5·1 answer
  • Hydrophilic molecules readily assosciate with
    7·1 answer
  • Some maerials can move across the cell membrane against a concentration gradient by
    14·1 answer
  • Who is Charles darwin​
    7·2 answers
  • What are the two means of moving large molecules across the cell membrane with energy
    8·1 answer
  • Which factors influence ocean currents? Select the three correct answers.
    10·2 answers
  • The division of the autonomic nervous system that is short‐lived and very localized is.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!