what happens to lac repressors in E. coli when lactose is present

Answer:

Yes.

Explanation:

Yes, DNA is formed from three main components comprise of deoxyribose sugar, phosphate group, and a nitrogen- containing base. This DNA molecule have a genetic information about the organism's form and structure. DNA is made of blocks of nucleotide and that nucleotide is formed from deoxyribose sugar, phosphate group, and a nitrogen- containing base.

Answer:

nucleotides

Explanation:

HECK YEA BROTHER!! (got it right on CK12)

The following statement(s) describe(s) likely reason(s) that a fish associated with a cleaner fish like labroides dimidiatus does not eat the cleaner fish, even when the cleaner fish is in its mouth is due to the establishment of a mutualistic relationship between the two fish.

The cleaner fish removes parasites, dead skin, and damaged tissue from the host fish, thus providing a cleaning service that benefits the host. In return, the cleaner fish receives nutrition from the mucus, scales, and skin cells of the host fish. Therefore, the host fish has evolved to tolerate the presence of the cleaner fish and not view it as a threat.

Additionally, the cleaner fish has evolved to display certain behaviors that signal to the host fish that it is not a threat, such as a distinctive coloration and specific swimming patterns. As a result, the host fish recognizes the cleaner fish as a beneficial partner and is less likely to eat it, even when it is in its mouth. In conclusion, the mutualistic relationship between cleaner fish and their host fish is the likely reason why the host fish does not eat the cleaner fish, even when it is in its mouth.

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The fish associated with a cleaner fish like Labroides dimidiatus does not eat the cleaner fish, even when the cleaner fish is in its mouth for the following reasons:• Labroides dimidiatus keeps the fish clean, which prevents infection.

• The fish understands that if it eats the cleaner, it will lose its source of free cleaning.• In addition, the fish understands that if it eats the cleaner fish, it may never find another cleaner.• Because the cleaner fish has a mutually beneficial relationship with the fish, it is allowed to eat parasites and dead skin off of the fish without being eaten. Therefore, it has developed a mechanism to keep from being eaten by fish.•

The cleaner fish also makes a rapid side-to-side motion when threatened, which usually scares the predatory fish off. It is less likely for the predator fish to eat cleaner fish even when it is in the mouth because the cleaner fish's presence in the mouth could give the prey fish enough time to shake the predator off or make an escape from the predator.As a result of these mechanisms, fish associated with cleaner fish like Labroides dimidiatus does not eat the cleaner fish, even when the cleaner fish is in its mouth.

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A high-resolution transmission electron microscope (HR-TEM) can reveal several qualitative information about a material, including its crystal structure, lattice defects, grain boundaries, chemical composition, and the presence of nanoparticles or nanoscale features.

A high-resolution transmission electron microscope (HR-TEM) is a powerful tool for investigating the structure and properties of materials at the atomic scale. By using a focused electron beam to transmit through a thin specimen, HR-TEM can provide detailed qualitative information about the material under study.

Firstly, HR-TEM can reveal the crystal structure of a material. By analyzing the diffraction patterns produced by the electron beam interacting with the crystal lattice, researchers can determine the arrangement of atoms within the material.

Secondly, HR-TEM can identify lattice defects within a material. These defects include vacancies, dislocations, stacking faults, and other structural imperfections that can affect the material's mechanical, electrical, or optical properties. HR-TEM allows researchers to visualize and characterize these defects at high resolution.

Furthermore, HR-TEM can detect and analyze grain boundaries in polycrystalline materials. Grain boundaries are interfaces between adjacent crystalline grains and can significantly influence the material's properties. HR-TEM enables researchers to examine the structure and properties of grain boundaries, providing insights into the material's behavior.

Additionally, HR-TEM can provide information about the chemical composition of a material. By utilizing energy-dispersive X-ray spectroscopy (EDS) in combination with TEM, researchers can map and identify the elements present in the material, aiding in the understanding of its composition and elemental distribution.

Lastly, HR-TEM is capable of visualizing nanoparticles and nanoscale features within a material. The high-resolution imaging capability of HR-TEM allows for the observation and characterization of nanoscale structures, such as nanoparticles, nanotubes, and nanowires, providing valuable insights into their size, shape, and arrangement.

In summary, a high-resolution transmission electron microscope (HR-TEM) can reveal qualitative information about a material's crystal structure, lattice defects, grain boundaries, chemical composition, and the presence of nanoparticles or nanoscale features. This information is crucial for understanding the material's properties and behavior at the atomic and nanoscale levels.

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Answer:

Experiment 1

Explanation:

This is because she repeated her experiment several times and not just one time.

Answer:

Most of the ATP energy obtained from cellular respiration is produced in the third and final stage, the electron transport chain.

Without a proper context is quite vague, nonetheless, we are seeing a cyclin behavior, at the end of each year we see a drastic drop in population numbers so probably we are seeing the effect of seasonal changes, now by the type of habitat of rabbits and the harshness of certain seasons is more logical to assume that we are seeing the effect of winters, so the correct answer is option d.

Answer: Yy; they’re purple if there’s no codominance or incomplete dominance

Explanation:

1. Is a virus a living organism? Why?

viruses are not living things because on their own they can do nothing until they enter a living cell. Also without cells, viruses cannot multiply

2. Why are antibiotics not good for virus infections?

antibiotics are useless against viruses cause viruses are so simple they use their host cells to perform their activities for them

3. What is the difference between an organ and an organ system?

organs are structures made up of two or more tissues

organ systems are systems composed of two or more organs

4. What happens to the other organ systems if one organ system fail? How does this affect homeostasis?

it will affect other organ systems cause all organ systems work together to function properly

if one organ system fails, it will affect other organ systems

5. What is one body system humans have? What is one body system humans DO NOT have?

one body system humans have is digestive system

i dont really know a system humans dont have

sorry :((

I hope this helped ! :)

Answer:

360

Explanation:

"bases and home plate on a baseball diamond is 90 feet"

90

your distance and displacement traveled as you finish your home -run jog around the bases

There are 4 bases in baseball.

90x4=360

Answer:

360

Explanation:

Explanation:"bases and home plate on a baseball diamond is 90 feet"90your distance and displacement traveled as you finish your home -run jog around the basesThere are 4 bases in baseball.90x4=360

Answer:

True

Explanation:

The statement "Sewage is the most common form of pollution in rivers and streams." is true.

Pollution is the accumulation of unwanted things in the place, which affects the place and the organisms living in the place. Pollution increases diseases and the purity of nature is decreasing.

Sewage is the dirty water that comes out from households, factories, and industries, which is disposed of in rivers and ponds.

Thus, the statement is true.

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Answer:

Eye color in Drosophila is an example of a X-linked trait: In Drosophila, the gene for eye color is located on the X chromosome. Clockwise from top left are brown, cinnabar, sepia, vermilion, white, and red. Red eye color is wild-type and is dominant to white eye color.

Explanation:

The definition of cellular respiration is as follows:

The advantages of cellular respiration are as follows:

During the process of cellular respiration, glucose and oxygen can be used as reactants while carbon dioxide, water, and useable energy are extracted in the form of products. It involves a series of chemical reactions to power life processes. Sunlight is used in the process of photosynthesis.

Therefore, cellular respiration is the process of using chemical energy from food and oxygen molecules to power life processes.

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Answer:

Due to change in environment or evolution.

Explanation:

The characteristics of life are not always perfect guidelines used for classification of living things because these characteristics of life are different for every organism due to change in environment or due to evolution occurs with the passage of time. So for that reason we classify organisms on the basis of common ancestor and similarities in the structure not on the characteristics of life.

Answer:

a

Explanation:

the nucleus

1. Forgetfulness: People may find themselves forgetting simple things like where they placed their keys, the names of familiar acquaintances, or even common words during conversations.

2. Difficulty Concentrating: Due to increased stress, anxiety, or the disruption of regular routines, many individuals have found it challenging to concentrate on tasks that were previously routine or easy for them.

3. Confusion with Time and Dates: With the blurring of routines and a shift to remote work or learning, some people have experienced difficulty keeping track of dates, days of the week, or the passage of time.

4. Increased Procrastination: The pandemic has brought about various challenges and uncertainties, leading to increased stress levels. This stress may result in a decreased motivation to complete tasks promptly, leading to procrastination.

5. Heightened Emotional Responses: The pandemic and its associated challenges can contribute to heightened emotional responses, causing individuals to feel more irritable, anxious, or overwhelmed than usual.

It's important to note that these experiences may vary from person to person, and they are not necessarily indicative of a medical condition. However, if you're concerned about any cognitive or mental health symptoms you're experiencing, it's always advisable to consult with a healthcare professional for a proper evaluation and guidance.

You can use the following formula to determine a population's change:

N = (B + I) - (D + E)

N represents the population change.

The number of births is B.

I represents the quantity of newcomers or immigrants to the area.

The number of fatalities is D.

E stands for the number of emigrants, or those who have left the area

for a example in a town to check the population ,2,000 babies were born. There were 700 new immigrants who became residents.  A total of 1,500 people died. Eight hundred people left the area. Using this data to complete the formula results in the following: N = (2,000 + 700) - (1,500 + 800)All that's left to do is solve the problem now that you have the knowledge and the formula. N = 2,700 - 2,300 N = 400

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The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of sulfur. The correct option is D.

Propane, propylene, butylene, isobutane, and n-butane are only a few of the volatile hydrocarbon gases found in liquefied petroleum gas, which is a fuel gas.

LPG is a fuel gas used in cars, cooking appliances, and heating appliances. LPG exists inside the cylinder as both a liquid and a vapour (gas).

In order to give the normally odourless LPG cooking gas a noticeable smell, a chemical called ethyl mercaptan is added that is a compound of sulfur.

Thus, the correct option is D.

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Normal saline does not readily cross cell membranes, so only a small volume of fluid, about 250 ml (25% of 1 L), will distribute into the intracellular space.

If Jack’s serum sodium was found to be normal and he receives 1 L of normal saline, about 250 ml of that volume will distribute into the intracellular space.

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Regular endurance exercise has been demonstrated to raise HDL cholesterol levels, which may help explain why physically active people have a lower risk of coronary heart disease than sedentary people.

High-density lipoprotein, or HDL, cholesterol collects cholesterol in the blood and transports it back to the liver, earning it the moniker "good" cholesterol. After then, the liver removes it from the body.

An essential B vitamin called niacin has the potential to reduce triglycerides and increase levels of high-density lipoproteins (HDL), or "good" cholesterol. Niacin has been used for a very long time to decrease triglycerides and raise HDL cholesterol.

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Answer:

Natural gas is a fossil fuel that burns relatively cleanly.

When natural gas is burned for energy, it produces fewer air pollutants and carbon dioxide (CO2) than when coal or petroleum products are burned to produce the same amount of energy.

An advantage of a natural gas-burning power plant over an oil-burning power plant is that the burning of natural gas produces no or less amount of air pollution as compared to that of oil or coal burning.

Natural gas may be defined as a type of non-renewable energy resource that typically synthesizes deep under the earth's surface. This gas is a mixture of hydrocarbons that primarily consists of methane.

The burning of natural gas generally releases very less or no amount of air pollutants like carbon dioxide, and other greenhouse gases which are harmful to all living entities. Natural gas is typically cleaner, environment friendly, and burned for energy.

But when coal, oil, or other petroleum products are burned, they release huge amounts of pollutants into the environment and make it toxic for all.

Therefore, it is well described above.

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Count how many oxygen bubbles the plant emits over the course of one minute. This is how quickly photosynthesis occurs at that specific temperature. Checking the gas to ensure that it is oxygen should be done - relights a glowing splint.

The quantity of enzyme-substrate collisions limits the pace of photosynthesis at low temperatures. The rate of photosynthesis rises as a function of temperature because there are more collisions as a result.

As photosynthesis is a chemical process, the pace of most chemical reactions normally rises with temperature, the higher the temperature, the greater the rate of photosynthesis will typically be. Yet, the rate of photosynthesis decreases considerably at temperatures exceeding 40°C.

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Answer: The reason for the increased number of drug-resistant bacteria being found in hospitals is due to MISUSE and OVERUSE of antibiotics.

Explanation:

Antibiotics is a type of drug that attacks bacteria microorganisms either by killing or eliminating the bacteria (that is, bactericidal) or by preventing further growth of the bacteria (that is, bacteriostatic). Antibiotics should be taken properly while being used to treat any diseases condition to prevent drug resistance by the bacteria from occurring.

The reason for the increased number of drug-resistant bacteria being found in hospitals is due to MISUSE and OVERUSE of antibiotics. This causes the bacteria to change the way they respond to these medicines making them become antibiotic resistance. When they infect an individual, the infections they cause are harder to treat than those caused by non-resistant bacteria.

Answer:

The biological levels of organization of living things arranged from the simplest to most complex are: organelle, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere.

Explanation:

hope to help

Answer:

A ‘receipt’ is a statement saying that what is presented is true

Explanation:

Hope this helps!（づ￣3￣）づ╭❤～

answer: a receipt is a statement saying that what is presented is true

To prepare 350 ml of LB culture medium, dissolve 18 tablets and add 7g agar-agar for agar form. For Coomasie, use 0.25g Coomasie, 100ml ethanol, 25ml acetic acid, and add distilled water to reach 250ml.

To prepare 350 ml of the culture medium LB, which is distributed in tablets, you need to calculate the number of tablets required. Each tablet can prepare 20 ml of culture broth.

1. Determine the number of tablets needed:

  Number of tablets = Desired volume / Tablet volume

  Number of tablets = 350 ml / 20 ml = 17.5 tablets

  Since you cannot have a fraction of a tablet, you would need to round up to the nearest whole number. Therefore, you will need 18 tablets to prepare 350 ml of the culture medium LB.

2. Dissolving the tablets:

  Add the 18 tablets to a container with distilled water and stir until the tablets completely dissolve.

3. Agar preparation:

  If you want to prepare the medium in the form of agar, you would need to add 2% m/v of agar-agar to the dissolved tablets. Here's how you can calculate the amount of agar-agar needed:

  Agar-agar (in grams) = Total volume (in ml) × Agar concentration (in %) / 100

  Agar-agar = 350 ml × 2% / 100 = 7 grams

  Add 7 grams of agar-agar to the dissolved tablets and mix well.

For the Coomasie solution:

1. Calculate the quantities needed for a 250 ml mixture:

  The Coomasie concentration should be 0.1% m/v in 40% v/v ethanol and 10% v/v acetic acid. The remaining volume is completed with distilled water. Let's calculate the quantities needed:

  Coomasie (in grams) = Total volume (in ml) × Coomasie concentration (in %) / 100

  Coomasie = 250 ml × 0.1% / 100 = 0.25 grams

  Ethanol (in ml) = Total volume (in ml) × Ethanol concentration (in %) / 100

  Ethanol = 250 ml × 40% / 100 = 100 ml

  Acetic acid (in ml) = Total volume (in ml) × Acetic acid concentration (in %) / 100

  Acetic acid = 250 ml × 10% / 100 = 25 ml

  Distilled water = Total volume (in ml) - (Coomasie volume + Ethanol volume + Acetic acid volume)

  Distilled water = 250 ml - (0.25 ml + 100 ml + 25 ml) = 124.75 ml

 Therefore, for the preparation of 250 ml of the mixture, you will use approximately 0.25 grams of Coomasie, 100 ml of ethanol, 25 ml of acetic acid, and around 124.75 ml of distilled water.

Please note that for precise calculations and accuracy, it's recommended to use a balance and measuring equipment with appropriate precision.

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Answer:

D.

She wishes to keep hot air from upstairs from flowing down the stairwell by convection