Describe the intracellular events that occur when a population of wild type ( lac+) escherichia coliis transferred from a medium with glucose as the sole nutrient source to a medium with lactose as the sole nutrient source.

Answers

Answer 1

The lac repressor protein is bound to the operator region of the lac operon when there is no lactose in the medium. When introduced in lactose, it binds to an allosteric site on the repressor causing its to change conformation and release from the operator. This allows the polymerase that is bound to the promoter region to proceed transcription of the lac operon genes (LacZ, Lac A, and Lac Y). Translation of these genes forms enzymes that enable the organism to break down lactose for energy.   






Describe The Intracellular Events That Occur When A Population Of Wild Type ( Lac+) Escherichia Coliis

Related Questions

The correct medical term for deficient activity of the adrenal glands is:

Answers

Answer is Hypoadrenalism

The correct medical term for deficient activity of the adrenal glands is "adrenal insufficiency," which encompasses various conditions related to inadequate adrenal function.

Primary Adrenal Insufficiency (Addison's Disease): This condition occurs when the adrenal glands themselves are damaged and cannot produce an adequate amount of essential hormones, particularly cortisol and aldosterone.

The most common cause of primary adrenal insufficiency is autoimmune destruction of the adrenal cortex. Symptoms may include fatigue, weakness, weight loss, and darkening of the skin.

Secondary Adrenal Insufficiency: Secondary adrenal insufficiency arises when the pituitary gland or hypothalamus in the brain does not release adequate amounts of adrenocorticotropic hormone (ACTH), which stimulates the adrenal glands to produce cortisol.

It can result from various factors, such as tumors, pituitary disorders, or abrupt withdrawal from long-term corticosteroid therapy. Symptoms are similar to primary adrenal insufficiency.

Adrenal insufficiency can lead to a range of symptoms, including fatigue, weakness, weight loss, low blood pressure, and electrolyte imbalances.

It can be life-threatening if left untreated. Diagnosis often involves blood tests to measure hormone levels, including cortisol and ACTH, as well as imaging studies to identify any underlying causes.

For such a more question on adrenal                                                                                                                                                                        

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Question

What is the correct medical term for deficient activity of the adrenal glands?

What characteristic is true of between 80 and 90 percent of the labor in most export processing zones (epzs)?

Answers

The characteristic that is true of between 80% and 90% of the labor in most export processing zones is that they are women. Export processing zones are areas within developing countries which offer incentives and a barrier-free environment to promote the economic growth by attracting foreign investment for export-oriented production. They are specific type of free trade zone that are set up to promote industrial and commercial exports.

Why are vestigial structures considered critical evidence of evolution?

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Vestigial structures are considered evidence since scientists believe they are structures that were once used by a species ancestors but are no longer needed. They do not impair the organisms in any way, so there is no need for evolution to get rid of them. Vestigial structures are anatomical features that no longer seems to have a function or purpose in the current form of an organism of the given species. Examples are wisdom teeth, the muscles of the ear, the appendix, the tail bone among others in human. 

Discuss the adaptations of vascular plants to life on land

Answers

Answer:
               Vascular plants are successful land plants. Spermatophyte  (seed plants) is the largest group of vascular plants having two sub classes, angiosperms and gymnosperms. It include 300 families, 12500 genera and 300000 known species. The most successful and and important of these plants belong to Gramineae or the grass family with 7500 known species, which have colonized the great area of earth surface in particularly all sort of soil and climatic conditions and constitute the main source of man's food supply.

Factors responsible for success 
1. Their adaptability to all kinds of environments.
2. The production of flowers,  fruits and seeds, which show various                    adaptations for dispersal over large area.
3. These plants posses cuticle a thick cover around the epidermis which help in maintaining water or prevent dehydration.
4. Stomata are pesent in leaves or lenticle in stem which regulate the in and out of CO₂, O₂ and H₂O.
5. Well develop root system which help in absorption of mineral and other nutrients.

Respiratory organs have large surface areas. how is this an advantage to an animal?

Answers

Large respiratory surface areas help an organism to have a more efficient gas exchange. The respiratory surface consists of an alveolar epithelial cell and a pulmonary capillary endothelial cell and it enables the movement of O2 and CO2 through it. The movement goes from the alveolar air into the blood for the O2, while CO2 moves in the opposite direction. With larger surface area more erythrocytes can pass and the more O2 can be received.

Your roommate is 5' 1" and weighs 100 lbs what bmi category would she be in

Answers

In this hypothetical situation the roommate would have a BMI of 18.9 which would be labeled as a Normal range of BMI.

What common bone structure is shared in the forelimbs of the lobe fin fish and amphibians?

Answers

The common bone structure that is shared in the forelimbs of the lobe fin fish and amphibians are the humerus, radius, ulna, and finger bones. Tetrapods are related by the presence of the named bones. Tetrapods includes all limbed vertebrates constituting the classes Amphibian, Reptilia, Aves, Mammalia. 

A type of white blood cell that engulfs foreign pathogens and activate lymphocytes is a(n)

Answers

I believe that the answer would be a phagocyte.

Phagocytes are a type of white blood cell that are found in bone marrow. They protect the body y engulfing foreign particles including pathogens.

I hope this helps! I'm happy to ask any other questions you might have :)

White blood cells are the specialized type of cells which are involved in the body's defense mechanism. Phagocytes such as Macrophages engulfs foreign pathogens and cell debris and activate lymphocytes present in the blood.

What are White blood cells?

White blood cells (WBC) are the specialized cells present in the blood which are responsible for the defense mechanism of the body against pathogens. White blood cells are of different types from which phagocyte is a major class.

Phagocytes are the class of white blood cells that are found in the bone marrow. They protect the body by engulfing the foreign particles such as pathogens and from cell debris.

Macrophage is a type of phagocyte. These are the body's first line of defense and play many roles. A macrophage is the primary cell which recognizes and engulf the foreign pathogens (antigens). Macrophages break down these foreign substances and present these smaller proteins to the T-lymphocytes.

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In what ways might anna's infection have played a role in her untimely death?

Answers

Anna's infection affected her body cells, it impaired the body's function and all organs. The urinary tract infection resulted to a septic shock that caused multiple organ failures. In addition to this, bacteria is yet to be identified so there is no actual reason stated for the cause of death.

Which of the following is defined as the age structure, sex ratio, and reproductive capacity of a population? Composition Distribution Dynamics Migration

Answers

The answer would be Composition

Answer:

The correct answer is option A, Composition

Explanation:

The population composition is the representation of population distribution based on the factors such as age, sex, culture, ethnic values etc. It is very essential component of population studies. There can be following types of population composition -

a) Based on age

b) Based on sex

c) Based on ethnic values

d) Based on religion

e) Based on caste

f) Based on language  

g) Based on occupation

Why did reporter bob woodward become interested in what appeared to be a routine burglary?

Answers

For the answer to the questions above, because one of the 5 defendants caught his attention. One of them was James McCord who answered that he was retired from government service (CIA) and ask himself on why was a former CIA agent involved in what seemed to be just a burglary.
Woodward and his colleague, Carl Bernstein investigated this. They uncovered a something that triggered a constitutional crisis which forced Nixon to resign to the office.

Final answer:

Reporter Bob Woodward became interested in the Watergate burglary because of information from anonymous sources implicating the White House. His investigation eventually led to Nixon's resignation.

Explanation:

Reporter Bob Woodward became interested in what appeared to be a routine burglary because he received information from several anonymous sources, including one known as 'Deep Throat', that led him to realize the White House was deeply implicated in the break-in. Woodward and his colleague Carl Bernstein continued to dig and publish their findings, keeping the public's attention on the unfolding scandal. The information eventually led to Nixon's resignation and the indictment of many individuals in his administration.

__________are inpatient treatment facilities that focus on the "resocialization" of the individual and use the program's entire community as important treatment components. question 13 options:
a.therapeutic communities
b.medical detoxification clinics
c.matrix communities
d.all of these are correct.

Answers

the answer is A. therapeutic communities

hope this helps you!

Answer is a. therapeutic communities.

Therapeutic communities are a common form of long-term residential treatment for substance use disorders. These communities provide drug-free environments in which people with addictive problems live together in an organized and structured manner to promote change toward recovery and re-socialization. Some such groups evolved into self-supporting and democratically run residences to support abstinence and recovery from drug use.

What is an allele? a dna sequence different versions of a gene a hairstyle a physical trait?

Answers

i believe the answer is different versions of a gene :)

In theory, a population grows most quickly at ____ % of the environment's carrying capacity

Answers

The answer to this question is 50%

What evidence would you need to show that genetic diversity is the result of reproductive character displacement?

Answers

Character displacement – trait evolution stemming from selection to lessen resource competition or reproductive interactions between species – has long been viewed as an important mechanism for enabling closely related species to coexist.

A biological or physical vehicle that carries an agent to a host represents a ____.

Answers

Answer: a. vector.

Vector is the vehicle that brings an agent(pathogen) into the host.  One of the examples of the vector would be mosquitos. Mosquitos can take blood from a person that infected by malaria parasites or dengue virus. After that, the mosquitos will fly to other person and introduce the agent taken earlier.

The ________ is not adequate for searching through large arrays

Answers

The linear/ sequential search algorithm is not adequate for searching though large arrays

Hope this helps!

algorithm

hope this helps (and that it is right)

What can be interpreted from the graph?

Answers

When working with non-linear functions, the average rate of change is not constant.

When working with non-linear functions, the average rate of change is not constant.

Explanation:

When working with linear functions, average rate of change is constant.

Answer:

can i see a grapgh plz

Explanation:

when grass is cut with a lawn mower, it gives off a distinct aroma. why does newly-mowed grass smell a little bit sweet?

Answers

It may smell pleasant but the plants are releasing stress signals called green leaf volatiles (GLV). this is an adaptation to warn other grass patches of the 'impending danger '. These compounds also help the grass heal it's wounds faster and prevent infections by pathogens.

Answer:

When the grass leaves are cut, a small amount of sugar is produced at the site of injury to plug the phloem.

Explanation:

I took the test and it's the correct answer hope it helps!

Organisms interact with the nonliving parts of their environments true or false

Answers

the answer for this is false, I believe

The major division of the nervous system that make up the brain and spinal cord is called:

Answers

Answer: Central Nervous System

-----

The two major subdivisions are the central nervous system and the peripheral nervous system. The CNS includes the brain and spinal cord, while the PNS is everything else outside it.

Vitamin d regulates the absorption of ______ from the small intestine. calcium and fluoride phosphorus and magnesium calcium and magnesium calcium and phosphorus

Answers

Final answer:

Vitamin D is crucial for the absorption of calcium and phosphorus from the small intestine. It facilitates the intake of these minerals, which are key to bone health and the prevention of skeletal diseases like rickets and osteomalacia.

Explanation:

Vitamin D regulates the absorption of calcium and phosphorus from the small intestine. It is essential for bone health because it promotes the synthesis of a specific calcium-binding protein, which is involved in the active transport of calcium across the small intestinal mucosa. Moreover, vitamin D facilitates the intestinal absorption of calcium and phosphorus, which are vital components of bone in the form of calcium phosphate and calcium carbonate.

Without adequate vitamin D, the body cannot effectively absorb calcium from the diet, leading to potential skeletal problems such as rickets in children and osteomalacia in adults, which may contribute to osteoporosis.

Thus, sufficient intake of vitamin D is critical not only for the absorption of calcium but also for maintaining normal calcium concentration in the blood and for the process of bone remodeling.

How do mirnas function in controlling gene expression? view available hint(s) how do mirnas function in controlling gene expression? by binding to dna and preventing transcription of certain genes?

Answers

I believe the miRNAs function in controlling gene expression by binding to the mRNAs and degrading them or blocking their translation. MicroRNAs are short non-coding RNAs that regulate gene expression post transcriptionally. They bind to the 3'-UTR of their target mRNAs and repress protein production by destabilizing the mRNA and translational silencing.
Final answer:

miRNAs are key components in gene regulation, working not by binding to DNA but by binding to mRNAs post-transcription. Their interaction with mRNAs results in mRNA degradation or inhibition of translation, suppressing specific gene expression.

Explanation:

MicroRNAs, commonly referred to as miRNAs, play a crucial role in the regulation of gene expression. Unlike the student's proposition, miRNAs do not generally bind to DNA. Instead, they function by binding to messenger RNAs (mRNAs) after transcription has occurred. The interaction between the miRNA and the mRNA typically results in the mRNA's degradation or the inhibition of its translation into a protein, thus preventing the expression of the corresponding gene.

These small non-coding RNA molecules are key components in the post-transcriptional regulation of gene expression, and can suppress the expression of specific genes through a process known as RNA interference. The ability of miRNAs to control gene expression makes them important regulators of various biological processes, including cell growth, differentiation, and apoptosis.

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Water-soluble nutrients absorbed into the blood are routed directly from the small intestine through the portal vein to the __________ before any other organ.:

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Water-soluble nutrients stored in blood are routed directly from the small intestine through the portal vein to the liver before any other organ. The portal vein or hepatic portal vein is a blood vessel which carries blood from the GI tract, to the liver. The blood contains nutrients and toxins extracted from digested contents. The portal vein is not a true vein, since it conducts blood to capillary beds in the liver and not directly to the heart. It is the main component of the hepatic portal system.

Final answer:

Water-soluble nutrients absorbed from the small intestine are sent directly to the liver via the portal vein for processing before reaching other parts of the body.

Explanation:

Water-soluble nutrients that are absorbed into the blood are sent directly from the small intestine through the portal vein to the liver before any other organ. The hepatic portal system is a critical component in the body's nutrient distribution system, where the liver acts as a processing plant. Nutrient-rich blood from the small intestine, where most absorption occurs, reaches the liver for detoxification, storage, or metabolic processing before being circulated to the heart and throughout the body.

Heterozygous alleles are found on ________ chromosomes

Answers

24 pairs of chromosomes

Answer is Homologous.

A diploid individual having two different alleles for a specific trait is called heterozygous. An allele is the alternative form of the same gene. The cells in diploid organisms contain sets of homologous chromosomes, which are paired chromosomes. Each chromosome of a homologous pair has the same genes on the same positions. Although homologous chromosomes have the same genes, they may have different alleles for those genes.  

Example: The gene for seed color trait in a pea plant exists in pair. One gene or allele for yellow seed (R) and the other for green seed color (r). A heterozygous plant would contain alleles for seed color (Rr). Gene R is present one chromosome and its allele (r) is present on the other chromosome of the homologous pair.  


A herpetologist wants to estimate how many snakes are in a forest. She counts 12 snakes in a 100,000 square foot area. Estimate how many snakes are in the entire forest of 7,000 acres.
(1 acre = 43,560 square feet)
Please help me solve thus

Answers

Answer:

Approximately 36 522

Explanation:

First convert 100 000 square ft to acres = 2.3

Using ratio method:

[tex]x = \frac{12 x 7000}{2.3} \\   = 36 521.7[/tex]

A nursing instructor is working with a class of first semester nursing students. the instructor explains the interrelatedness of health and wellness. what would be the best definition the nursing instructor could give of health?

Answers

health is relating to ones physical nature, and wellness is a broader spectrum relating to overall well being...IE: physical and mental

Plant hormones can have different effects at different concentrations. this explains how ________.

Answers

Plant hormones can have different effects at different concentrations. This explains how

auxin can stimulate cell elongation in apical meristems, yet will inhibit the growth of axillary buds

Concentration produce different effects on plant hormones which explains why auxin at low concentration induce growth in apical meristems but at higher concentrations inhibit growth of axillary buds.

What are plant hormones?

Plant hormones are chemical substances produced by plants which modify and regulate the growth and development of plants.

Plants hormones include the following:

auxin abscissic acid ethylene

Plant hormones can have different effects at different concentrations. At higher concentrations they may have inhibitory effects while at low concentrations, they may have stimulatory effects.

For example auxin at low concentration induce growth in apical meristems while at higher concentrations, they inhibit growth of axillary buds.

Therefore, concentration produce different effects on plant hormones.

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The client with o+ blood is in need of an emergency transfusion but the lab does not have any o+ blood available. which unit of blood can be potentially given to the client?

Answers

In an emergency, a client with O+ blood can receive O- blood due to its universal donor status. If O- is unavailable, blood types with the same Rh factor, such as A+ or B+, might be used cautiously, considering the risk of immune reactions. Research into artificial blood substitutes aims to eliminate the incompatibility risk in transfusions.

If a client with O+ blood requires an emergency transfusion and O+ blood is not available, the following blood type can be given:

The first alternative would be O- blood, as it lacks the A, B, and Rh antigens, making it a universal donor blood type that is compatible with all other ABO and Rh blood groups.If O- blood is also not available, then in an emergency, the next safest alternative would be a blood type with the same Rh factor, such as A+ or B+, to avoid Rh incompatibility reactions. However, this introduces a risk for an immune reaction due to the A or B antigens present in donor blood.

The critical principle to be followed is that transfused blood must not contain antigens that the recipient's antibodies can attack. In an emergency where universal donor blood is not available, and the patient's life is threatened by acute hemorrhage, medics can use saline solutions to replace some lost blood volume or potentially transfuse compatible blood types if cross-matching is not feasible.

Research is ongoing to develop artificial blood substitutes, with oxygen carriers like hemoglobin and perfluorocarbons, which would allow for transfusions without the risk of incompatibility.

The part of the brain most closely associated with the regulation of hunger, thirst and body temperature is the :

Answers

Hypothalamus is the part of the brain that is most closely associated with regulation of hunger, thirst, and the body temperature. Hypothalamus is a small but an important part of the brain below the thalamus; it contains several small nuclei with a variety of functions. It plays important roles in the nervous system as well as in the endocrine system.  Hypothalamus is linked to pituitary gland which is also a vital gland in the endocrine system.
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How did the actions of Tiberius Gracchus change the Roman Republic? 1.He angered the Senate by proposing that Rome divide public lands among the returning military and their families. 2.He replaced the elected consuls and the Senate with an empire that could be inherited by members of the ruler's family. 3.He angered the Senate by convincing men to serve in wars by promising them land and citizenship. 4.He restructured the city's politics and strengthened the Senate's power.3 A substance that is not soluble in a polar solvent is The tendency for one extreme phenotype, such as large size or extreme coloration, to be favored over average phenotypes is called Wolff-kishner reduction (hydrazine, koh, ethylene glycol, 130c) of the compound shown gave compounda. treatment of compound a with mchloroperoxybenzoic acid (mcpba) gave compound b, which on reduction with lithium aluminum hydride gave compoundc. oxidation of compound c with chromic acid gave compound d (c9h14o). identify compounds a through d in this sequence, and do not indicate stereochemistry. Probably the biggest issue I kept running into is credibility. The first source that I found seemed to be perfect. It was up to date, and it was an article published in an online newspaper. However, my mom pointed out that the newspaper publishing the article was a highly political website that only published articles that agreed with their political point of view. While the information itself may still have been useful, I felt uncomfortable citing an article from a website with such an obvious bias. Media are like the watch dogs of society. Discuss three ways in which the media act as the watchdogs of society After september 2, 1949 both united states and soviet union had atomic weapons that they could use in a war against each other. How did this fact shape the progress of the cold war and relationship between the two countries Dwarf galaxies are generally only about one-fifth the size of the andromeda galaxy. true or false Which of the following best explains why the North supported high tariffs on foreign goods?A) With high tariffs, foreign goods were taxed so much that the North did not have to lower prices to compete with themB) With high tariffs, it was too expensive for Southern states to buy slaves from Africa, so slavery would stop spreading.C) Without tariffs, the North was afraid that America would trade so much with England that the U.S. would lose independence.D) Without tariffs, the South would not be able to sell their crops for as much money and would stop farming altogether. Use right triangle DCB to find the trig values for angle D.sinD = cosD = tanD = Your grandfather works on the new york times crossword puzzle every day. he has been very good at solving the puzzle and nearly always does. his ability to remember the meaning of words has shown no decline as he has aged, and really shows very little decline for most older adults. what type of memory is this? 2. A cube-shaped aquarium has edges that are 3 ft long. The aquarium is filled with water that has a density of 62 lb/ft^3 (a) Should the aquarium be placed on a table that can support a maximum weight of 200 lb? Explain why or why not. (b) Would the density of the water change if the aquarium was only half full? Explain. Answer: Who became famous for the American victory at Saratoga?A. General Bernardo de GlvezB. General Baron von SteubenC. General Horatio GatesD. General John BurgoyneE. General Barry St. Leger Soar con bebe recien nacido muerto In addition to confession, another important way of letting go of negative emotions is ________ Which of the following graphs shows a negative linear relationship with a correlation coefficient, r, relatively close to -1 When no more than 110 units are produced, the cost of producing y units is given by c(x). c(x)equals0.2 x cubed minus 24 x squared plus 1524 x plus 31 comma 272 how many units should be produced in order to have the lowest possible average cost? Explain how you can use a model to find 4x 3/8 In a circle, a 225 degrees sector has area 490pi in2. What is the radius of the circle? Which of these is a small, icy object that orbits the sun? options: asteroid comet meteoroid star