The lac operon in Escherichia coli Group of answer choices promotes the expression of lactose-utilizing enzymes when lactose is absent from the environment. prevents lactose-utilizing enzymes from being expressed when lactose is absent from the environment. prevents lactose intolerance. prevents lactose-utilizing enzymes from being expressed when lactose is present in the environment.

Answers

Answer 1

Answer:

The correct answer is - prevents lactose-utilizing enzymes from being expressed when lactose is absent from the environment.

Explanation:

The lac operon or the lactose operon is a operon that is essential for the many bacteria like Escherichia coli for metabolism and transport of the lactose.

In the presence of the lactose in the environment of the cell the lac genes are expressed due to the isomer of of lactose called allolactose binds to the Lac repressor protein and do not allow to bind it to lac operator. But in the absence of the lactose, the lactose utilizing enzymes are not expressed  due to repressor bind to the lac operator and prevents the binding of RNA polymerase to the promoter.


Related Questions

what is the first president of of Canada​

Answers

Answer:

Sir John Alexander Macdonald was the first prime minister of Canada

F. Choose the odd one out from the given term and name the category to which
the others belong.
1. Haemophilia.Colour blindness, thalassaemia, night blindness
2. Gene. Chromosome. Allele, Ovule
3. Diffusion. Imbibition. Osmosis, Oxidation
4. Seed shape. Seed colour. Flower position. Inflorescence

Answers

Answer:

1. night blindness

2. Ovule

3. Oxidation

4. Inflorescence

Explanation:

1. Night blindness is odd among haemophilia, colour blindness, thalassaemia because night blindness is not an inheriditary disorder while other three are inheriditary diorder.

2. Ovule is odd among gene, chromosome, allele, ovule because ovule develops into a seed when fertilized and is not a part of genetic material DNA while the other three are part of genetic material.

3. Oxidation is odd among diffusion, imbibition, and osmosis because other belongs to the method of conduction of water and minerals by plants.

4. Inflorescence is odd among seed shape, seed colour and flower position because inflorescence is a group pf flower is flower axis while other belongs to a characteristic of a single or individual flower.

Hence, the correct answer is:

1. night blindness

2. Ovule

3. Oxidation

4. Inflorescence

The leading strand runs in a
direction and is replicated
A. 5' to 3', continuously
B.5' to 3', discontinuously
C. 3' to 5', continuously
D. 3 to 5', discontinuously

Answers

Answer:

option C is correct that is 3` to 5` continuously

Explanation:

when replication begins the two parent DNA strand  are separated one of this is called leading strand and is replicated continuously in the 3` to 5` direction the other strand is lagging strand and is replicated discontinuously in short sections

What is each half of a chromosome called?
O A. Demisome
OB. Spindle Fiber
C. Chromatid
D. Centromere

Answers

Answer:

cromatidaida

Explanation:

Answer:

the answer is C

''chromatid''

Explanation:

hope this helps :)

A research biologist is studying cells from a new organism recently discovered in the Brazilian rainforest. She determines that the somates contain a total of 10 chromosomes. How many possible combinations of chromosomes could this organism produce as a result of independent assortment

Answers

Answer:

32 possible combination of chromosome

Explanation:

According to the law of independent assortment as proposed by Mendel, alleles of a gene will separate into gamete independently of the alleles of another gene. Since this organism contains 10 chromosomes in its somatic cell, it will undergo meiosis to produce half number of chromosomes in its gametes i.e. 5 chromosomes.

If we know the haploid number of chromosomes of an organism i.e. n, we can calculate the possible combination of chromosomes that will be present in its gametes as a result of independent assortment during meiosis using the formula:

2^n, where n= haploid no. of chromosome

If n is 5 chromosome in this case, the possible combination of chromosome in its gametes will be 2^5 = 32. Hence, as a result of independent assortment, an organism with 10 chromosome in its somatic cell will produce 32 possible combinations of chromosome in its gametes.

The Amish populations in the United States began with relatively few individuals and have not recruited many newcomers to the population. Today, these Amish populations exhibit a much higher incidence of polydactyly (possessing extra digits) than other American populations. Which mechanism of evolution is likely responsible for this phenomenon

Answers

Answer: The founder effect

Explanation: The high incidence of polydactyl prevalent among the Amish population could be attributed to the a case of genetic drift called the founder effect. The founder effect occurs when a small population consisting of few people separate from a much large population, just like the Amish population separating from the larger American community. Due to the few composition or small size of the population, the genetic impact or influence on members of the population is usually higher than the effect on the larger population and leading to more rapid spread. The relatively small individuals which make up the Amish population compared to the larger American community is the reason why polydactyl hmis prevent within them and since theere are no newcomers, the trend will likely continue.

What adaptation allows the Artic fox to survive in its environment?

Answers

Answer: Arctic foxes have several adaptations that allow them to survive. Their round, compact bodies minimize surface area that is exposed to the cold air. Their muzzle, ears, and legs are short, which also conserves heat.

Explanation:

Fish developed many characteristics for survival. Match the parts of the fish to their correct functions.
allow the fish
to breathe
underwater
protects the fish
from the external
environment
creates balance and
helps with escape
and predation


eye
gills
fin
mouth
scales

Answers

Gills allow the fishes to breathe underwater. Scales help the fish in external environments due to waters. And find help balance the fish becoming more quicker. Mouth let’s fish eat small algae. And eyes help fish see electric move money from muscles to help see.

The fish breathes by using its gills. The outer scales protect themselves from the outer environment. Fins are for creating balance and protection. Mouth and eye is for predation.

What are the characteristics of fish?

A fish is classified as a vertebrate because it has a vertebral column. There are different types of fish, such as cartilaginous fish and bony fish. In cartilaginous fish, the endoskeleton is made up of cartilage, and this is seen in some large deep-sea animals such as sharks.

Bony fish such as Labeo rohita have endoskeletons made up of bones. This bone is stronger and harder than the cartilage. Most deep-sea animals lack bony skeletons because the pressure exerted on the body at that depth causes them to sink; this is why they evolved in this manner. Some fish can store an oil-like structure that helps them maintain body functions. Some have an air bladder that maintains the proper position.

Hence, the fish does breathe through its gills. The outer scales protect themselves from the outer environment. Fins are for creating balance and protection. Mouth and eye is for predation.

Learn more about the fish here.

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6.
Water rises in the xylem tubes due to
photosynthesis.
respiration
gravitation pull.
transpiration pull.
Tul​

Answers

My answer to the question is Transpiration pull.

Which motion describes molecules in a solid at extremely low
temperatures? *
Moving freely and randomly in a space
Vibrating while closely packed together
Sliding around one another and colliding
Bumping together with some room to move​

Answers

Answer:

vibrating while closely packed together

Explanation:

Your question has been heard loud and clear.

Vibrating while closely packed together is the right answer

which type of cell(s) contain ribosomes?

Answers

Answer:

Ribosomes are found in prokaryotic and eukaryotic cells; in mitochondria, chloroplasts and bacteria. Those found in prokaryotes are generally smaller than those in eukaryotes. Ribosomes in mitochondria and chloroplasts are similar in size to those in bacteria. hope this is good enough to help you

Explanation:

Which of the following statements is true? Bacteria and protozoa are examples of unicellular organisms. Individual cells do not need to maintain homeostasis. Most multicellular organisms reproduce through mitosis. Two identical daughter cells are created from sexual reproduction.

Answers

Answer:

Bacteria and protozoa are examples of unicellular organisms.

Explanation:

Bacteria are prokaryotic organisms in which the genetic material is not enclosed in a membrane. Bacteria are one of the oldest groups on Earth. Bacteria may inhabit diverse environments such as the deep ocean, soils, acidic hot surfaces, radioactive materials, etc. On the other hand, protozoa (also known as protozoan) are unicellular, heterotrophic, eukaryotic microorganisms, whose genetic material is enclosed within a nucleus that has a membrane. This group was originally considered to be animals because they have animal-like features including, for example, motility and predation.

The statement "Bacteria and protozoa are examples of unicellular organisms" is true. Bacteria and protozoa are both single-celled organisms.

What are the false statements?

The statement "Individual cells do not need to maintain homeostasis" is false. Homeostasis is the ability of cells to regulate their internal environment to maintain a stable condition necessary for proper functioning.

The statement "Most multicellular organisms reproduce through mitosis" is false. Most multicellular organisms reproduce through a process called meiosis, which involves the formation of specialized cells called gametes.

The statement "Two identical daughter cells are created from sexual reproduction" is false. Sexual reproduction involves the fusion of two gametes, resulting in the formation of a genetically diverse offspring.

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A teacher collected some
beetles from a rotting log
and placed them in a
container of dry oatmeal in
her classroom. She kept the
box covered with a light cloth
so that the beetles could not
escape. She also asked one
of her students to add
potato and apple pieces
once a week to provide food
and moisture for the beetles.
After several weeks, the
student reported that there
were some strange-looking,
wormlike organisms in the
container

Answers

Answer:

beetle larva

Explanation:

if you think about fat as old stuff,what new stuff can be made from it

Answers

Answer:

Paints, Lubricants, Biofuel, Face cream, Soap,

Explanation:

Fat is derived from plant and animal sources. They include seeds, fruits, fatty fish.

Fats serve as a source of energy in organisms and also serve as insulation.

If you think about fat as old stuff,what new stuff can be made from it means of the things fats can be made from and they include Paints, Lubricants, Biofuel, Face cream, Soap etc. These products are manufactured in industries on a large scale due to their high demand.

Answer:

Paints, Lubricants, Biofuel, Face cream, Soap,

Explanation:

Match each statement to the type of behavior it describes. Jenna published the results of her latest experiment for the public to see. Malcolm altered an experiment to be able reach his desired conclusion. Elena keeps complete records of all her experiment results. Neal shared the results of his field study even though they didn’t support his hypothesis.

Answers

Answer:

See the answer below

Explanation:

It may seem that the question is incomplete. The complete question reads:

Match each statement to the type of behavior it describes. Jenna published the results of her latest experiment for the public to see. Malcolm altered an experiment to be able reach his desired conclusion. Elena keeps complete records of all her experiment results. Neal shared the results of his field study even though they didn’t support his hypothesis. Put each description to the group it belongs to. 1.Responsible 2.Irresponsible.

To answer the question:

Responsible behavior

Jenna published the results of her latest experiment for the public to see.Elena keeps complete records of all her experiment results.Neal shared the results of his field study even though they didn't support his hypothesis.

Irresponsible behavior

Malcolm altered an experiment to be able to reach his desired conclusion

Responsible behaviors are those that support responsible scientific practices and do not jeopardize the objective nature of research. Every data during experiments must be well kept and after thorough analysis, results must be published fro the public to see irrespective of whether it agrees or disagrees with the original hypothesis.

Altering an experiment in order to achieve the desired result is grossly irresponsible, as this eliminates the objectivity that should be the main goal of every experiment. Bias must be eliminated from every scientific experiment.

The narrative point of view in this excerpt allows the
reader to experience
O Rainsford's feelings as he enters the room.
Rainsford's feelings about his host.
Rainsford's impression of the dining room.
O Rainsford's impression of the island.

Answers

Answer:

O Rainsford's impression of the dining room.

Explanation:

Richard Connell's short story "The Most Dangerous Game" revolves around the famed hunter Sanger Rainsford and his change of fortune when he was left stranded in an island famed for hunting humans as a game by the island's barbaric owner General Zaroff.

In the given excerpt, the narrator reveals the "dining room to which Ivan conducted (Rainsford)". The impression that the hall was "of feudal times with its oaken panels, its high ceiling, its vast refectory table where twoscore men could sit down to eat" reveals the outline of the enormous dining hall where Rainsford was conducted to eat with Zaroff. This narrative point of view allows the reader to experience the impression of the dining room.

Answer:

C

Explanation:I took the quick on Ed (:

Which of the following choices correctly shows an example of the way energy flows in an ecosystem? A. Rattlesnake to Hawk to Kangaroo Rat to Fungus to Cactus B. Fungus to Hawk toRattlesnake to Kangaroo Rat to Cactus C. Cactus to Kangaroo Rat to Rattlesnake to Hawk to Fungus D. Cactus to Fungus to Kangaroo Rat to Hawk to Rattlesnake

Answers

ANSWER:

C. Cactus to Kangaroo Rat to Rattlesnake to Hawk to Fungus

EXPLANATION

Living organisms in an ecosystem obtain energy by feeding on one another. As one organisms feeds on the other, ENERGY FLOWS. However, the flow of energy is UNIDIRECTIONAL. The flow of energy is represented by a FOOD CHAIN where the arrow signals which organism is feeding on which.

According to this question, a typical example of energy flow in a terrestrial ecosystem is as follows:

Cactus → Kangaroo rat → Rattlesnake → Hawk → Fungus

In the above food chain, energy flows as cactus plant (producer) is fed on by kangaroo rat (primary consumer), which is fed on by rattlesnake (secondary consumer), which is fed on by hawk (tertiary consumer). Hawk is decomposed by fungi (decomposer) when it dies. Energy flows in this direction.

Hence, an example of the way energy flows in an ecosystem is represented by Cactus to Kangaroo Rat to Rattlesnake to Hawk to Fungus

EQ: What is the scientific Method and
how do we use it in our everyday lives?

Answers

Answer:

The scientific method :

Make an observation.

Ask a question.

Form a hypothesis, or testable explanation.

Make a prediction based on the hypothesis.

Test the prediction.

Iterate: use the results to make new hypotheses or prediction

Explanation

that's the scientific method but there are many example to how you use it in everyday life i.e the lights went out and you want to find out why, perhaps you didn't pay your bill or maybe the power went out.  then you would go through the steps to find out what happened

In part A, you analyzed genes that contribute to two diseases. (cystic fibrosis and muscular dystrophy) How can scientists use this information to develop new treatments for these diseases? Based on your findings, do you think that scientists will need to develop multiple treatments to control symptoms of these diseases? Explain your reasoning.

Answers

Answer:

By designing suitable gene therapies in order to restore target gene expression.

Explanation:

Cystic fibrosis and muscular dystrophy are inherited genetic disorders associated with serious health problems. Cystic fibrosis is caused by mutations in the gene that encodes for the cystic fibrosis transmembrane conductance regulator (CFTR) protein, and it is a condition associated with abnormal production of sticky mucus that leads to problems in the lungs and the digestive systems. On the other hand, muscular dystrophy is produced by mutations in genes localized on the X chromosome such as, for example, the gene 'dystrophin'. Gene therapy is an experimental approach used to compensate abnormal gene function by introducing exogenous genetic material and thus restore their altered protein products. Consequently, personalized gene therapies can be useful to treat inherited disorders such as cystic fibrosis and muscular dystrophy.

What effect does insulin have on the body? It raises blood-sugar levels. It lowers blood-sugar levels. It raises glucagon levels. It lowers glucagon levels.

Answers

it regulates blood sugar level.

Explanation:

Insulin helps control blood glucose ( sugar) levels by signaling the liver and muscle and fat cells to take in glucose ( sugar) from the blood. Insulin therefore helps cells to take in glucose (sugar) to be used for energy. If the body has sufficient energy, insulin signals the liver to take up glucose ( sugar) and store it as glycogen.

The following events are part of a negative-feedback mechanism. I. blood pressure increase II. receptors detect a low blood pressure III. control center compares actual pressure with the set point IV. the heart beats faster Choose the arrangement that lists the event in the order they occur.

Answers

Answer:

II, III, IV, I

Explanation:

Blood pressure regulation is an example of negative feedback mechanism. When the blood pressure is low, sensor in the blood vessels called baroreceptors detect this and send a signal to the control center which is the hypothalamus.

The hypothalamus compares the current blood pressure with the normal and proceeds to send signals to the heart, as well as blood vessels and kidneys. The heart begins to beat faster, thereby increasing the heart rate and a a result, blood pressure goes back up to normal.

You collect a specimen from a deep jungle survey. It appears to be a new species. You
get to name it, but before you can, you must classify it first. It appears to be single celled,
and contains chloroplasts. When a few of them are kept in the dark too long, they die.
Under the microscope you can see a dark colored nucleus. What classification fits them
best?
O A. Archaeabacteria
B. Fungus
C. Plant
OD. Plant-like protist

Answers

Answer:

The correct option is;

D. Plant-like protist

Explanation:

Protists are a broad collection of not so strictly connected microscopic unicellular (single celled) eukaryotic organisms that is neither a fungus, plant, or an animal but are categorized under the kingdom known as Protista

Protophyta is a known plant-like protist that is made of single celled algae

Other single-celled chloroplast containing protists are diatoms, and dinoflgelates.

A bumblebee carries pollen from the male portion of a plant to the female portion of the same flower. Fertilization occurs. Which statement is true about this type of reproduction?
A.
It’s asexual, and the offspring are genetically identical to the parents
B.
It’s sexual, and the offspring are genetically identical to the parents.
C.
It’s asexual, and the offspring are genetically different from the parents.
D.
It’s sexual, and the offspri

Answers

Answer:

U R (A)sexual  

Explanation:

If you see my dear, the answer will be A because it is not sexual (just like you lol) the offspring will be genetically similar to the parent, which you probably are not, you are adopted :)

I have four brothers
"This is what type of
observation?

Answers

Quantatative data since it is physically counting

1. A government is

.when people who own their own businesses and property
.Institution through which a society makes and enforces public policies
.Institution who elects representatives
who provides goods and services that are bought, sold and used​

Answers

The correct answer is B. Institution through which a society makes and enforces public policies

Explanation:

The government is one of the most important institutions in society. The main function of this institution is to define who holds the political power, how are laws and policies created, how is a nation protected, and how to maintain the general order by enforcing laws and politics. Moreover, there are different types of government depending on who has the power and makes political decisions, this includes democracy, monarchy, aristocracy, etc. In this context, the option that best describes the government is B.

Raekwon wanted to see if listening to music would make the basketball players make more
baskets. On day one, he didn't play any music and counted how many baskets they could
make in 10 minutes. On day 2, he played rap music and counted the baskets, and on day 3,
he played classical music and counted the baskets. IV DV control​

Answers

answer

IV-music

DV-baskets in 10 mins

control-the day no music was played

step by step

IV is the variable being adjusted to achieve variety of results

DV is the counts that will depend on the music played

control with no music only one variable was being tested the counts so a control is where one variable is being tested

What is the friction force of an object wtih a gravity force of 30N, normal force of 30N, applied force of 6N to the right, and a net force of 20N to the left?

Answers

Explanation:

Given that,

The force of gravity is 30 N

Normal force is 30 N

Applied force is 6 N (right)

Net force is 20 N (left)

We need to find the friction force of the object. We know that friction is an opposing force. It always acts in the opposite direction of the applied force. The magnitude of applied force and friction force is same but direction is different.

Hence, frictional force is 6 N to the left.

an interpretation interpretation and explanation are important to study of science because

Answers

Answer:

An interpretation interpretation and explanation are important to study of science because if the following steps are not carefully taken the outcome could change.Scientists use their observation skills to gather data, their inter- pretation skills to understand what was observed, and their explanation skills to explain why the data either supports or disproves a hypothesis.

Hope this helped you!

Explanation:

From Scenario 1: What is the Experimental group?
O the color change
O the type of bush
O the type of soil
O the type of fertlizer

Answers

Answer:

the colour change

Explanation:

because experimental group refers to the things that are exposed to or get affected by the independent variable

Answer:

The tpe of bush

Explanation:

-gene 1
-gene 2
-gene 3
How are these three genes related?

Answers

Answer:

Depends on the locations of these gene segment on the chromosome whether it be found on the same or different.

It can either be linked or unlinked.

Other Questions
What is the recursive definition for 25,20,15,10? A credit downgrade typically results in _________ interest rate for new debt. A. no change in B. not enough information to tell C. a higher D. a lower 2. There is a(n) _________ relationship between the price of an outstanding bond and market interest rates. A. none of the above B. positive C. direct D. inverse 3. The greater the volatility of earnings the ______________ the bond rating when everything else is held constant. A. there is no relationship between earnings and bond rating. B. higher C. lower D. volatility is irrelevant when evaluating earnings Describe the culture of Jewish Orthodox in America Which equation does the graph of the systems of equations solve? (1 point) 2 linear graphs. They intersect at negative 1, 1 Qu resistencia debe ser conectada en paralelo con una de 20 para hacer unaresistencia combinada de 15 ? What are the basic characteristics of object-oriented analysis and design (OOAD)? How does OOAD compare to structured analysis and design (SAD)? Investing activities on the statement of cash flows generate cash inflows and outflows related to borrowing from and repaying principal to creditors and completing transactions with the companys owners such as selling or repurchasing shares of common stocks and paying dividends.A. True B. False Which of the following is TRUE regarding a dead weight loss.a) It refers to the loss producers incur when operating with excess capacity.b) It is only a feature of perfectly competitive markets.c) It only occurs when a product sells at below equilibrium price.d) It never arises in markets where producers have market power. g how much money should be deposited today in account that earns 5% compounded interest quarterly so that it will accumulate to 7600 in 9 years Assuming that the firm is maximizing profits, the marginal cost of the last unit produced equals:________Price Quantity Total cost10 10 809 20 1008 30 1307 40 1706 50 2305 60 300 4 70 380a. $4 b. $40 c. $5 d. $50 e. $6 There are $400$ pages in Sheila's favorite book. The average number of words per page in the book is $300$. If she types at an average rate of $40$ words per minute, how many hours will it take to type the $400$ pages of the book? Dr jasmine Carr told Maria and her parents that she would have to get braces . Chocolate the correct word that would help clarify the unclear pronoun reference that is boloded Determine the volume of a sphere with a diameter of 70 mm. Question 13 options: A) 21,714.7 mm3 B) 3,216.9 mm3 C) 100,024 mm3 D) 179,594.4 mm3 Which of the following is true regarding the trial balance? Select all that apply. The trial balance includes all of the accounts needed to create the balance sheet and the income statement. Assume Jones Manufacturing begins March with 20 units of inventory that cost $15 each. During March, the following purchases and goods sold were: March 15 Purchased 25 units at $18 30 Sold 30 units Using the FIFO inventory costing method and the perpetual system, what is the ending Merchandise Inventory on March 30? MADs target capital structure is 60 percent debt and 40 percent equity. The yield to maturity on the companys new debt will be 10 percent. MADs beta is 1.7, the risk free rate is 4% and the required market return is 12%. If the companys tax rate is 30 percent, then which of the projects will be accepted? What volume (in mL) needs to be added to 69.6 mL of 0.0887 M MgF2 solution to make a 0.0224 M MgF2 solution 3.03 times 10^-3 in scientific nation 1. A political-economic system that generally includes an authoritarian government:______.2. An economy that depends on strong entrepreneurship and capital investment by individuals:_______. 3. A centrally planned economy:_______.4. A system where prices and wages are set by supply and demand:______. On January 1, 2021, Kendall Inc. began construction of an automated cattle feeder system. The system was finished and ready for use on September 30, 2022. Expenditures on the project were as follows:January 1, 2021 $290,000 September 1, 2021 $408,000 December 31, 2021 $408,000 March 31, 2022 $408,000 September 30, 2022 $290,000 Kendall borrowed $786,000 on a construction loan at 12% interest on January 1, 2021. This loan was outstanding throughout the construction period. The company had $4,680,000 in 9% bonds payable outstanding in 2021 and 2022.Interest capitalized for 2021 was:__________