A classmate has asked you to help them determine the concentration of DNA in their solution. Their A260 reading was 1.69. What was the concentration of their DNA

Answers

Answer 1

Answer:

Acid , phenol or protein

Explanation:

The ratio of absorbance at 260 and 280nm is what is usually used to assess the purity which a DNA or RNA posses. A ratio of 1.8 is generally accepted as being pure for a DNA sample and a ratio of 2.0 is generally accepted also as being pure for RNA. when the ratio is significantly lower in each case, it indicates that there is presence of protein, phenol or other contaminants.


Related Questions

What happens at the Pacific Ring of Fire?

Answers

Answer:

THE PACIFIC RING OF FIRE Is an area around the pacific ocean with a lot of volcanic activity. magma is under the surface and lava is above the surface.

The Ring of Fire is home to 75% of the world's volcanoes and 90% of its earthquakes. This movement results in deep ocean trenches, volcanic eruptions, and earthquake epicenters along the boundaries where the plates meet, called fault lines.  

so in conclusion in the pacific area there is basically a lot of volcanic activity

hope it helps

its all i could think of : )

Explanation:

I need a media article, about science, that seems like bs. More about sex or anything along those lines? I need to debunk it. But that article has to be based off an actual scientific experiment with a published paper. Does anyone have any articles?

Answers

Are you referring to debunking sex as in sex and gender are separate? Because that’s true, here’s a great link for that! Interviewed a scientists. The guardian, meet the neuroscientist shattering the myth of the gendered brain. There’s also statistics in this article.

Which is a common mistake to watch out for when taking a test?
reading test directions
rushing through the test
checking that answers are legible
showing all work

Answers

Answer:

Rushing through the tests B.

Explanation:

Answer:

The answer you are lookin for is B

Explanation:

What enzyme catalyzes the reaction in the Calvin cycle?

Answers

Answer:

ribulose bisphosphate carboxylase (RuBisCO)

Explanation:

The Calvin cycle is a process utilized to ensure carbon dioxide fixation. ... The carbon dioxide is combined with ribulose 1,5-bisphosphate to form two 3-phosphoglycerate molecules (3-PG). The enzyme that catalyzes this specific reaction is ribulose bisphosphate carboxylase (RuBisCO).

Answer:

ribulose bisphosphate carboxylase

Why are stem cells important to multicellular organisms?

Answers

Answer:The fabulous ability of an embryo to diversify and of certain adult tissues to regenerate throughout life is a direct result of stem cells, nature's gift to multicellular organisms.

Explanation:

Diagram 1 shows the tilt of Earth's axis. Diagram 2 shows how Earth would look if the tilt of the axis were increased. Each diagram shows the same two locations, Location X and Location Y. Sun Y X- um Earth Diagram 1 Sun •Y X- Swi Earth Diagram 2 Which statement BEST predicts the effect of increasing the tilt of Earth's axis in Diagram 2 on the two locations? Location Y will be cooler in winter and Location X will be cooler in summer. Location Y will be warmer in winter and Location X will be cooler in summer, Location Y will be cooler in winter and Location X will be warmer in summer. Location Y will be warmer in winter and Location X will be warmer in summer. PLEASE HELP MEEEEE​

Answers

Answer:

confused

Explanation:

Identify the structure labeled C

A. Phosphate
B. Nucleotide
C. Base
D. Sugar

Answers

C. Base

In DNA there are 4( sometimes 5) types of bases: adenine, guanine, thymine. They are the BASES

Hope that helps :)!

what shoukd the patient expect to experience living with the disease- Sitius Inversus?? in ur own words

Answers

Answer:

there is a complete mirror image transposition of the thoracic (chest) and abdominal organs , and anterior-posterior (front-back) symmetry is normal. Many affected people have no associated health issues when the condition is isolated.

Explanation:

How could research on mice or rats help answer our medical research questions — questions that are, after all, about humans?

Answers

Answer:

you could disect them or observe what they do by doing things like putting them in a maze or seeing what they do in front of a mirror.

Explanation:

Define essential nutrient.

Answers

Answer:

Here:

Explanation:

They are nutrients that are not produced inside your body but your body needs it to survive. One example is Omega-3 fatty acid which is an essential fatty acid.

Answer:

Substance that must be obtained from the diet because the body cannot make it in sufficient quantity to meet its needs.

Explanation:

Hope this answers your question :)

There are three semicircular canals per ear.
True
O False
Qui

Answers

The answer to this question is true

Describe what happens in your central nervous system when you prepare and eat breakfast. Start with objects in the environment and be specific.

Answers

Answer:

CNS controls eating by homeostatic mechanisms that interact  with different cognitive control systems (e.g., memory, reward, attention, etc)

Explanation:

In the brain, eating control is modulated by different systems:

1- Homeostatic control: the hypothalamus plays a key role by controlling both the appetite and food intake

2- Attention: the parietal and visual parietal cortices are involved in sensory perception and integration

3- Emotion and memory: amygdala and hippocampus

4-Cognitive control: the prefrontal cortex (i.e., executive functions)

5-Reward: associated with the functioning of the striatum

In the first place, external signals such as, for example, neurotransmitters and hormones, are received by the hypothalamus that interacts with different systems (reward, emotion, memory) in order to achieve a homeostatic control of eating. Neuronal stimulation (for example, when we view foods), is achieved by the supply of oxygenated hemoglobin.

This diagram shows a plant cell. Which of these statements about plant cells must be true?
A)
A plant cell does not have a nucleus.
B)
Plant cells are all the same exact size and shape.
C)
A plant cell has many smaller vacuoles.
D)
A plant cell contains one large vacuole.

Answers

Answer:

I think the answer is a plant cell contains one large vacuole in its wrong because they have a nucleus I did not all plants have the same size or shape and they only have one large vacuole or sap vacoule hope it helps

Answer:

Its d

Explanation:

DNA libraries are useful for identifying and isolating eukaryotic DNA fragments of interest in research. Select the ways in which genomic and cDNA libraries differ.

a. Genomic libraries are difficult to express in prokaryotic cells, which lack a splicing mechanism.
b. cDNA libraries contain only the sequences from genes that are expressed in an organism.
c. cDNA libraries are the DNA fragment collections that are stored and propagated in host cells through cloning.
d. cDNA libraries contain more sequence information than genomic libraries.

Answers

a is correct because for cDNA first we need to have out mRNA sequence and we know that in prokaryotes they dont have mRNA and splicing mechine

The ways in which genomic and cDNA libraries differ is that the Genomic libraries are difficult to express in prokaryotic cells, which lack a splicing mechanism. Thus, the correct option for this question is A.

What do you mean by Genomic libraries?

Genomic libraries may be defined as a group of overlapping segments of genomic DNA that is significantly cloned into a backbone vector, which statistically includes all regions of the genome of an organism efficiently in order to function normally.

On contrary, cDNA libraries may be characterized as the collection of cloned DNA sequences that are complementary to the mRNA and were remarkably extracted from an organism or tissue in order to stimulate its function.

Therefore, genomic libraries are difficult to express in prokaryotic cells, which lack a splicing mechanism is one of the ways in which genomic and cDNA libraries differ.

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Which of the following is a property of matter in the liquid
state?

Answers

Answer:

the answer is- the element

Explanation:

reason for my answer is because only two element are liquid at standard conditions for temperature and pressure: mercury and bromine.

The zika virus was first identified in Uganda in 1947. The virus is transmitted from person to person by a bite from a mosquito. It is commonly carried by the Aedes mosquito which is prevalent throughout Central Africa. The virus has more recently spread to the Americas (South, Central, and now North) and is expected to spread to Europe. There is a concern that the virus may reach epidemic proportions. Zika virus is related to yellow and dengue fever. Common symptoms are low grade fever and a distinctive skin rash and other symptoms include vomiting, headache, and muscle and/or joint pain. Pregnant women should avoid traveling to areas known to have zika virus present because the virus is known to cause microcephaly and developmental difficulties related to the central nervous system. Based on the paragraph above, class discussions, and other VALID (be careful with your selection of e-materials! CDC – Center for Disease Control is a good place to start) sources of information please answer the following questions. State a reason why the virus has spread to the Americas and likely to spread to Europe. Define the term microcephaly. What bones of the fetal skull would be affected by zika? Specifically, what area of the CNS is not fully developed in microcephalic individuals. In 1 -3 sentences describe the developmental difficulties of microcephalic individuals. How does one know if they have contracted zika? Do men need to be concerned about contracting zika? How does one avoid contracting zika? In a short paragraph (2-5 sentences!) provide one example of a scientific measure that could possibly control the spread of zika and explain how the measure works (controls the spread).

Answers

Answer:

1.Most people infected with the Zika virus have no signs and symptoms, while others report mild fever, rash and muscle pain. Other signs and symptoms may include headache, red eyes (conjunctivitis) and a general feeling of discomfort. Zika virus is also called Zika or Zika virus disease. 2.The frontal and parietal bones, but not the occipital bone, collapse over the injured brain. Almost all of the children had prominent calcifications in the brain. Unlike in children infected with cytomegalovirus, periventricular calcifications are the exception in children infected with Zika virus. 3.No they should not be worried.

Explanation:

What do some scientists today believe causes more adaptations' competition or environmental changes?

Answers

Answer:

According to an April study, table corals (Acropora hyacinthus) can adapt to resist bleaching in warmer waters. On Ofu Island in American Samoa, A. hyacinthus lives in both hot and cool pools. In the lab, researchers tested corals from both environments to see how they reacted to increased heat.

Explanation:

i dont really know i tried

Some scientists today believe that adaptations are more caused or provoked by the fact of competition.

What is meant by Adaptation?

Adaptation may be defined as the process that significantly involves the modification of internal and external attributes of organisms that makes them fit for survival and reproduction in the natural environment.

Competition is because of the fact that as the diversity of organisms increases, the resource limits remarkably enable the organisms to activate the mechanism of competition. Due to this, each and every species makes itself superior in order to make their survival in the natural environment.

Therefore, some scientists today believe that adaptations are more caused or provoked by the fact of competition.

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HELP will give brainlst and 20 points if ur correct
Explain how scientist measure geologic time.

Answers

The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks. They used relative dating to divide Earth's past in several chunks of time when similar organisms were on Earth.

Answer: Layered rocks and evolution of life and radiometric time scale based on radioactivity of chemical elements

Explanation:

Two scales are used to date these episodes and to measure the age of the Earth: a relative time scale, based on the sequence of layering of the rocks and the evolution of life, and the radiometric time scale, based on the natural radioactivity of chemical elements in some of the rocks.

When a patient comes to a hospital with severe dehydration, doctors will give
them an IV filled with a salt-water solution called saline, which is isotonic with
the body's blood cells.
Why is the patient not given pure water?

Answers

Answer:

The red blood cells could burst.

Explanation:

If they are given pure water, the IV fluid will be hypotonic to the blood cells. That means water will end the red blood cells by osmosis, from a high concentration outside to a lower concentration inside.

This will result in the red blood cells becoming swollen and even potential  bursting.

How does the storage of energy in ATP molecules benefit a cell?

Answers

Answer:

ATP. Specifically, during cellular respiration, the energy stored in glucose is transferred to ATP (Figure below). ATP, or adenosine triphosphate, is chemical energy the cell can use. It is the molecule that provides energy for your cells to perform work, such as moving your muscles as you walk down the street.

Explanation:

what level of protein structure is found in most enzymes and hemogoblin​

Answers

Interactions among the amino acid side chains within a single protein molecule determine the protein's tertiary structure. Tertiary structure is the most important of the structural levels in determining, for example, the enzymatic activity of a protein.

Tertiary level of protein structure is found in most enzymes and hemoglobin.

What are the functions of proteins?

Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for the structure, function, and regulation of the body's tissues and organs.

Protein has many roles in your body. It helps repair and build your body's tissues, allows metabolic reactions to take place and coordinates bodily functions. In addition to providing your body with a structural framework, proteins also maintain proper pH and fluid balance.

There are seven types of proteins: antibodies, contractile proteins, enzymes, hormonal proteins, structural proteins, storage proteins, and transport proteins.

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which kingdoms contain organisms that are multicellular You by bacteria archaea bacteria plant Amenia​

Answers

Answer:

(B and (C    

Animalia and Plantae

Explanation:

Got it right on edge (:

The kingdoms that contain organisms that are multicellular are Plantae, Animalia, and Fungi.

What are multicellular organisms?

Multicellular organisms are living beings that comprise cells, they represent the prevailing form of life, on our planet encompass a range of organisms such, as plants, animals, fungi and certain protists.

The emergence of organisms has bestowed benefits compared to their unicellular counterparts. Notably their ability to achieve sizes and intricate complexities sets them apart.

Moreover multicellular organisms possess the capability to differentiate their cells for functions. This adaptability enables them to thrive in environments and enhances their edge in securing vital resources.

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Which of the following lists the levels of body organization from least complex to most complex?

Answers

Answer:The highest level of organization for living things is the biosphere; it encompasses all other levels. 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:

Which means of particle transport is shown in Figure 7–4 below?

The figure shows the inside of a cell, the cell membrane, and the outside of the cell. Inside the cell, 15 spheres are labeled “high concentration.” Outside the cell, three spheres are labeled “low concentration.” A sphere enters a figure labeled “transport protein” that spans the cell membrane. An arrow shows that the sphere is moving from outside of the cell into the cell. A lightning bolt-shaped arrow is labeled “energy” and points to the transport protein.• A shaded hemisphere is shown at the top of the illustration titled 'Inside of Cell.' In the hemisphere are sixteen small spheres labeled 'High Concentration.'
• At the bottom of the illustration is the label 'Outside of Cell' on the unshaded part of the image. There are three small spheres labeled 'Low Concentration' in this area.
• A curvy horseshoe looking shape labeled 'Transport Protein' is shown entering the inside of the cell and has an upward arrow labeled on it.
• A small sphere is at the bottom of the curvy horseshoe shape with a jagged arrow next to it labeled 'Energy.'
A. diffusion
B. osmosis
C. facilitated diffusion
D. active transport

Answers

Answer:

The answer is D

Explanation:

In a given strand of dna the number of thymines

A. Is same as the number of uracils

B. Is double the number of guanines

C. Is double the number cytosines

D. Is the same as the number of adenines

Plz answer ASAP

Answers

Answer:

D. same number as adenines

Explanation:

As mentioned, adenines match with thymines and cytosines match with guanines, so there will always be the same quantity of guanine and cytosine and the same quantity of adenine and thymine.

Answer:

D

Explanation:

The number as adenines

Which conditions need to be in balance for cells to function? Check all that apply.

Answers

Blood sugar
Food intake
Body water
Body temperature
Body mass

Hope this helps!

true or false all cells living or dead can produce new living cells ​

Answers

Answer:

TRUE!

Scientist use dead cell embryos to produce living cells

All cells living or dead cannot produce new living cells. Only the living cells can produce new cells. Therefore, the given statement is false.

What is Cell division?

Cell division is the process by which a parent cell divides into two new daughter cells. Cell division usually occurs as a part of a larger cell cycle in which the living cell grows and replicates its chromosome before undergoing division.

Cell division occurs in living cells through mitosis and meiosis. The cell division occurs through karyokinesis and cytokinesis. Cell division is a part of the cell cycle. Cell cycle is divided into different phases such as G1 phase, S phase, G2 phase, and M phase.

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Describing Uses for Mercury
Visit this website and locate the element mercury, whose chemical symbol is Hg. Click on the square to read about the history, properties, and uses of mercury.

Name three uses for mercury.

Answers

Answer:

Mercury is used for making thermometers,advertising signs, and mercury switches.

Explanation:

hope this helps! :)

Answer:

thermometers, barometers, diffusion pumps, and other laboratory instruments

pesticides, dental preparations, batteries, and catalysts

Explanation:

Plzz help!
Which best describes the relationship between two species and a niche?
If two species have the same niche, one species will always become extinct.
Two species are able to occupy the same niche in the same habitat.
Two species cannot occupy the same niche in the same habitat.
If two species have the same niche, one species will always move.

Answers

Answer:

C. Two species cannot occupy the same niche in the same habitat.

Explanation:

just took the quiz

Answer:

C

Explanation:

I did it on edge 2020

Which of the following is a function of nucleic acids?
a. Nucleic acids provide energy.
b. Nucleic acids store fatty acids.
c. Nucleic acids store and transmit genetic information.
d. Nucleic acids manufacture simple sugars,

Answers

Answer:

I belivie is C) Nucleic acids store and transmit genetic information

good luck ;)

Yeah It’s C it’s right because I got it right on my test
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find the possible factor for the estimated product 5,600 Which description correctly identifies the difference between political appointees and civil service workers?A.Political appointees work for the government, while civil service workers work for the president.B.Political appointees work for the military, while civil service workers are civilians.C.Political appointees get their jobs through the merit system, while civil service workers get their jobs through the spoils system.D.Political appointees get their jobs from the president, while civil service workers get their jobs based upon their ability. Math question please help Refer to the Newsela article "A Step-by-Step Guide to the Scientific Method."What is the meaning of experiment?(A) a controlled observation(B) proof that a hypothesis is true(C) an answer to a question(D) a list of questions----------------------------------------------------------------------------------------------------------------------------Refer to the Newsela article "A Step-by-Step Guide to the Scientific Method."Part AWhich statement is a central idea of the text?(A) Scientists generate guesses in the scientific method.(B) Variables are sometimes used in the scientific method.(C) The scientific method is based on reading scientific journals.(D) The scientific method is based on observations.Question 2Part BWhich detail from the text best supports the answer in Part A?(A) Experiments produce evidence for scientific ideas.(B) Scientists share their results in journals and papers.(C) Conditions change in different experiments.(D) Hypotheses are ideas about what might happen. Describe the global demand for oil over the past few decades. How much oil was being produced daily? I have 7 cookies. If I eat 1/4 of them of the cookies. How many cookies do I have left? Dao has 2 38 pounds of hamburger meat. He is making 14pound hamburgers. Dao has enough meat to make 10 hamburgers. True Or False? How does a circle help create a trianglular shape 23. For the reaction shown, calculate how many moles of eachproduct form when the given amount of each reactant com-pletely reacts. Assume there is more than enough of theother reactant.2PbS(s) + 302(g) 2PbO(s) + 2S02(8)(a) 2.4 mol PbS(b) 2.4 mol O2(c) 5.3 mol PbS(d) 5.3 mol O2 A sample of 100 mg of cobalt is studied over time. After 1 year, the sample was measured at 97.5 mg. If the size of the sample continues to change at the same rate, which equation models the change? A newborn baby has about 26,000,000,000 cells. An adult has about 1.9 X 10^3 times as many cells as a newborn. About how many cells does an adult have? 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Hattie traced her mothers index finger to a building that was so high that she had to crane her neck to see the top.This? Evelyn gasped.Her father, the man who was never at a loss for words, didnt say anything. He adjusted the weight of the three bags that contained most of the possessions theyd been able to bring on the three-hour plane journey that had uprooted them from their old lives and deposited them in New York City.Her father struggled to open the heavy front door, and when they were inside, the smell of hundreds of different meals clashed in her nose: spaghetti, fried chicken, fish, and curry. They stood in front of a bank of elevators as Evelyn pushed the button for the seventeenth floor. When they entered what would be their new home, Hattie spun around in tiny circles as her father gave them the grand tour.Here is where you and Evelyn will sleep, he announced. 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She wanted to put the smile back on because she knew it would be better for Evelyn and everyone else that way, but she couldnt summon it now. She turned around and saw her blurry sister through tear-filled eyes. In front of her face, Evelyn was holding a folded-up picture of the whole family in front of the farmhouse.I miss it too, Evelyn began, but we dont have to forget it.Together, they taped the picture to the corner of the bedroom window so they could see it whenever they wanted. Hattie pulled Evelyn close, knowing that a place would never be as important as the people in it. Vanessa collected Barbie dolls. She began with 2 dolls and added the same amount of dolls to her collection each year. In the 24th year, Vanessa had 98 dolls. Which function, d(n), can be used to determine the number of dolls Vanessa had in any year? Show complete working format please What is the Spanish word for sir"?la cajab. seora.c.de acuerdod. aqu The TCMS Mustangs played the GCF Grizzlies. 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Match the sentence to what it illustrates. independent clauses linked without a conjunction Christ was equal with God, but He willingly became a servant. an introductory participial phrase Hang gliding is a popular pastime; it takes skill and a bit of daring. a mark indicating that a list will follow You seem to have found, my good friend, a real peace in life. a comma linking two independent clauses Walking without a cane, the old man tried to escape unnoticed. a sentence demonstrating direct address These colors were chosen for the school: purple, green, and white. Nanjones Company manufactures a line of products distributed nationally through wholesalers. Presented below are planned manufacturing data for the year and actual data for November of the current year. The company applies overhead based on planned machine hours using a predetermined annual rate. 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