An operon in E. coli called the Gua operon, encodes proteins responsible for guanine biosynthesis. Two genes, guaA and guaB are under the control of a single promoter and operator, similar to the arrangement in the lac and trp operons. A repressor protein, purR, binds to the operator. In what conditions (high guanine or low guanine) do you suppose this repressor binds to the operator? Do you consider this a "repressible" or "inducible" operon? 3 pts

Answers

Answer 1

Answer:

Hight guanine"Repressible" operon

Explanation:

An operon is a fragment of DNI with genes that encode for different proteins of metabolic vias. Operons are composed of a regulator gene (that codifies for the repressor), the operator region (that links with the repressor protein), and the promotor sequence (RNA polymerase recognizes the promotor where it begins the RNA synthesis).

The repressor deactivates the expression of a gene when binding the operator of that gene. This binding does not allow the production of mRNA, and hence, proteins that this molecule should synthesize.

This protein has a negative effect on genic expression impeding the transcription of RNA from DNA.

Operons might be inducible or repressible. When the operon is inactive, and a little inductor protein activates it, then the operon is inducible. On the contrary, the repressible operon is the one that is normally active, but the little corepressor protein inactivates it.

During high guanine concentration, the repressor protein must act to regulate the amount of guanine in the environment. Hence it links the operator of genes guaA and guaB to stop the biosynthesis. The operon was initially active, but then by the union of the repressor, it gets inactivated. This is a "repressible" operon.

Related Questions

What do you notice about the Moon’s orbit?

Answers

Answer:The Moon has a nearly circular orbit (e=0.05) which is tilted about 5° to the plane of the Earth's orbit. Its average distance from the Earth is 384,400 km. ... Therefore, Earth-bound observers can never see the 'far-side' of the Moon. Tidal forces cause many of the moons of our solar system to have this type of orbit.

Explanation:

Write a food chain from this food web with six trophic levels.

Link In Comments

Answers

Answer:

where is the link I didn't see in comments

PLEASE HELP ME WITH THIS QUESTION

Answers

Answer:golgi apparatus

Explanation:

The Golgi apparatus is the correct answer

How does the phrase
division of labor relate to differentiation?

Answers

It relates because whither separate a long fast into more manageable steps.

SOMEONE PLZ HELP ME!!!!!!!!!!!!!

Answers

The cell membrane because it protects the whole cell. I’m pretty sure that’s right.

Is cellulose a monosaccharide, disaccharide, or polysaccharide.

Answers

Answer:

Monosaccharide.

Explanation:

The major component in the rigid cell walls in plants is cellulose and is a linear polysaccharide polymer with many glucose monosaccharide units. This is the storage form of glucose in animals and humans which is analogous to the starch in plants.

Answer:

It is a polysaccharide

Explanation:

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Genetic counselors work mostly with
1 school counselors.
2 researchers in genetic engineering.
3 elderly adults who live in care facilities.
4 couples who are planning to have children.

Answers

Answer: couples who are having children

Explanation:

I got it right on my quiz

Does the resulting wave demonstrate destructive
interference? Explain your answer.

Answers

Answer:

Destructive interference happens when one wave is oscillating the opposite way as the other one, so it compensates.

Explanation:

Answer:does not demonstrate destructive interference,

Explanation:

How are cancerous cells different from normal cells?

Answers

Answer:

Cancer cells differ from normal cells in many ways that allow them to grow out of control and become invasive. One important difference is that cancer cells are less specialized than normal cells. That is, whereas normal cells mature into very distinct cell types with specific functions, cancer cells do not.

Explanation:

Hope this helps ya!!

SOMEONE PLZ HELP!!!!!!!!!!!

Answers

Answer:

B

Explanation:

it was a question I had last week on my test.

Answer:

endoplasmic reticulum (ER)

Explanation:

What is a feedback mechanism?

Answers

Feedback occurs when outputs of a system are routed back as inputs as part of a chain of cause-and-effect that forms a circuit or loop. The system can then be said to feed back into itself

What controls when a cell divides?

Answers

Answer:

A variety of genes are involved in the control of cell growth and division. Tight regulation of this process ensures that a dividing cell's DNA is copied properly, any errors in the DNA are repaired, and each daughter cell receives a full set of chromosomes.

Explanation: hope this helps love

Answer:

A variety of genes are involved in the control of cell growth and division. Tight regulation of this process ensures that a dividing cell's DNA is copied properly, any errors in the DNA are repaired, and each daughter cell receives a full set of chromosomes.

Explanation:

Villi in small intestine helps to increase area of absorption for minerals and nutrients.

True
False

Answers

I think it’s true correct me if I’m wrong .

Answer:true

Explanation:The function of the plicae circulares, the villi, and the microvilli is to increase the amount of surface area available for the absorption of nutrients. Each villus transports nutrients to a network of capillaries and fine lymphatic vessels called lacteals close to its surface.

What is a major difference between DNA replication and DNA transcription?

Answers

Answer:

RNA molecules produced by transcription are much shorter in length than DNA molecules produced by replication.

Explanation:

In DNA transcription, only a segment of DNA is copied, or "transcribed," to a complementary strand of messenger RNA.

In DNA replication, the entire length of the DNA molecule is copied so that it can be passed to a new cell.

HELPPP ITS DUE IN A HOUR!!!

Answers

Answer:

below

Explanation:

Radiation Transfer which is the fission of atoms, and conduction, which is the solidarity of atoms

One goal of scientists is to assign every organism a universally accepted name according to the system known as

Answers

Answer:

Binomial Nomenclature

Explanation:

Karl Line is the creator of the binomial nomenclature, which leads to uniqueness in naming plants and categorizing plants into classes, orders, genders, and species.

Binomial nomenclature in biology denotes the official method of naming species. As the word itself suggests, the scientific name is formed by a combination of two expressions: the name of a genus and a species.

pls help me answer this

Answers

Answer:

Hypertonic:) u welcome

Explanation:

Answer:

I would probably say #4 All the previous could cause this

Biology: Performance Task 1 (USATESTPREP) What goes in the blanks in each column of the Venn Diagram? Need help ASAP (30 minutes or less)

Answers

Answer:

ok hollup ima need to get it up

One difference between weather and climate is that _____. climate is localized, and weather occurs over large areas. weather is localized, and climate occurs over large areas. weather is the day-to-day conditions, and climate is the conditions expected over relatively long periods of time. climate is the day-to-day conditions, and weather is the conditions expected over relatively long periods of time.

Answers

Answer:

Weather is the day-to-day conditions, and climate is the conditions expected over relatively long periods of time.

Explanation:

The difference between weather and climate is how long the period of time they refer to is.

Weather is what conditions of the atmosphere are over a short period of time, or day-to-day conditions. It's what we see on the weather forecast every day - whether it's going to be sunny or rainy today and tomorrow and similar.

Climate is what conditions of the atmosphere are over longer periods of time, usually 30 years. In fact, it's an average pattern of weather for a particular region. A description of a region's climate will include the precipitation, temperature, humidity, sunshine, wind velocity, phenomena such as fog, frost, and hail storms, and similar conditions.

A salt is formed during a reaction of sodium and chlorine ions. Which type of bonding occurred?

A. Van der Waals forces

B. hydrogen bond

C. ionic bond

D. covalent bond

Answers

The Answer is: Ionic bond

. Oleander is a very hardy plant that can survive in a wide
variety of climates. It is also known to have very distinct
hydrotropic behavior. Explain how this may be problematic if
the oleander is planted near a home or business.

Answers

Answer: you have to tend to it for 1 hour ever day and make sure there are no weed taking the water.

Explanation:

help

someone that knows it

Answers

Answer:

According to the image, the approximate QT interval is 0.4 seconds.

Explanation:

The QT interval is the space between the beginning of the QRS complex and the end of the T wave, which represents from the beginning of depolarization to ventricular repolarization.

Considering that the extandardized measurements of an EKG, where the paper circulates at a speed of 25 mm/s, 1 mm horizontal —measuring time— has an equivalence of 0.04 s.

In the image, there is 10 mm between the beginning of the QRS and the end of the T wave, so:

    0.04 seconds X 10 mm = 0.4 seconds.

Then, the estimated QT interval is 0.4 seconds.

What is the purpose of the Terra satellite? O A. To monitor conditions on Earth B. To identify near-Earth objects C. To search for planets in other solar systems D. To observe the movement of the moon


n e w a. p. e. x. 2020​

Answers

Answer:

to monitor conditions on earth

Explanation:

To monitor conditions on Earth is the purpose of the Terra satellite. Therefore, the correct option is option A.

An artificial object that is purposefully placed into orbit around a celestial body, most frequently the Earth, is referred to as a satellite. It can be either manned or unmanned, and depending on how it is made and how it works, its purpose can be very different. Satellites have revolutionised many elements of our daily lives and have become essential parts of modern technology. Satellites come in a variety of varieties, each with a special function. Long-distance communication is made possible, for instance, by communication satellites that transfer signals between ground stations. To monitor conditions on Earth is the purpose of the Terra satellite.

Therefore, the correct option is option A.

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Which statement describes competition in an environment? Organisms share a place to sleep. A living thing consumes berries on a tree. Sunlight shines only three months out of the year. A stream supplies an abundance of water in a forest.

Answers

Answer:

Sunlight shines only three months out of the year.

Explanation:

I think this is right

Because abundance means a large amount so there would be no competition there.

If organisms share a place to sleep then that means no competition

If a living thing is consuming berries on a tree then the living thing is just eating

But if the sunlight only shines three months out of the year then that can cause a shortage of food in the environment causing for the living creatures in the environment to compete for the food that is left since there won't be enough to supply for and abundance of living things.

The statement that describes competition in an environment is option B a living thing consumes berries on a tree. Thus, consuming berries on a tree is reducing the availability of the food for other livings depends on the berries.

What is survival of living things?

In the nature, the concept that survival of the fittest domintates. The organisms which are fit physically and are smart to gather food will survive in the nature otherwise they will extincts.

An ecological community is a collection of populations of at least two distinct species that interact both directly and indirectly in a specific geographic area. Within this community, diffrent organisms can be found .

Numerous ecological characteristics and functions, including nutrient cycling and food webs, are based on interactions between species. Depending on the evolutionary context and environmental factors that they take place in, these interactions can have a variety of different natures.

Because of this, ecological interactions between particular individuals and entire species are frequently difficult to identify and quantify and depend on their scale and context they face extinction. Hence, option B is correct.

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NEED HELP RLLY BAD!!
What does glucagon do for the body
1. tells the body to release insulin to lower blood glucose levels
2. tells the body to release glycogen to increase blood glucose levels
3. tells the body to release insulin to increase blood glucose levels
4. tells the body to release glycogen to decrease blood glucose levels

Answers

it prevents the blood glucose levels from dropping too low. hope that helps!

PLEASE HELP ME WITH THIS QUESTION

Answers

the answer is the smooth endoplasmic reticulum

Given that almost all organisms obtain energy from food by the process of cellular respiration, which is the most likely explanation for what prevents Earth from running out of oxygen? A. The net effects of the reactions of photosynthesis and cellular respiration are the opposite of one another, therefore the products of one are the reactants of the other, creating a cycle. B. The energy flow—and thus oxygen flow—for cellular respiration and photosynthesis take place in the same direction, and therefore build upon one another. C. Cellular respiration is a process that releases energy and oxygen, while photosynthesis withdraws energy and uses oxygen, therefore keeping each process in balance. D. Oxygen readily accepts electrons, so cellular respiration uses a negligible amount of oxygen.

Answers

Answer:

a

Explanation:

ther are many explanation

4. When an offspring grows off from the body of a parent organism it is called __________________. *

a.fission
b.budding
c.fragmentation
d.sporulatioin

Answers

Answer:

Budding

Explanation:

It is asexual reproduction in which offspring grows out of the parents organisms.

In the process of budding, an offspring grows off from the body of a parent organism and buds off when fully matured. Thus, the correct option is B.

What is Asexual Reproduction?

Asexual reproduction is the type of reproduction only a single parent is involved. In this process, offspring are developed from a single parent called mother cell and these offspring are genetically identical to the parent hence are also called as clones.

During the process of budding which is a types of asexual reproduction, a new organism develops from an outgrowth or bud which is formed on the parent plant due to the cell division at a particular site on the parent plant. For example, the small bulb-like projections coming out from the yeast cell are the buds which give rise to new yeast organism.

 

Therefore, the correct option is B.

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What is the outcome of meiosis?

A. Meiosis creates four identical daughter cells

B. Meiosis creates two unique daughter cells

C. Meiosis creates two identical daughter cells

D. Meiosis creates four unique daughter cells

Answers

Answer:

c

Explanation:

Answer:

d.four unique daughter cells

Explanation:

I learned this last year trust me ;)

Least specialized cells to most specialized cells

Answers

Answer:

1)  Zygote cell

2) Blastocyst cells

3) Mesoderm cells

4) Heart Cells

Hopefully, it helps. :)

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