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

HELPP PLEASE!!

What is a subjective claim?
A claim based in personal opinion.
A claim that covers two subjects or topics.
A claim based on verifiable fact.

Answers

Answer:

A

Explanation:

its a expression of belief, opinion, or personal preference

Photosynthesis/CR definition

Answers

Answer:

Photosynthesis is the process in which green plants and some other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Cellular Respiration is the process through which cells convert sugars into energy. To create ATP and other forms of energy to power cellular reactions, cells require fuel and an electron acceptor which drives the chemical process of turning energy into a useable form.

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 :)!

An atom has a mass number of 36 and an atomic number of 16, how many
neutrons does the atom have?

Answers

Answer:

36

Explanation:

To find out how many neurons an element has you subtract it’s mass from the atomic number.

Mass (36) - number (16) = 20 neutrons

The height of a painting is ft. Between which two consecutive whole numbers is ​?
Choose the correct answer below.
A.
and
B.
and
C.
and

Answers

Answer:

a

Explanation:

I don't understand what you want it's all the same they all say and

How does the movement of water, carbon, and nitrogen in ecosystems differ from the movement of energy?

Please help me this is due today, thank you if you do^^

Answers

Answer:

While water, carbon, and nitrogen cycle through the ecosystem, energy flows through an ecosystem.

Explanation:

There is a limited amount of water, carbon, and nitrogen in an ecosystem, and therefore, it cycles and passes through an ecosystem multiple times. In the case of energy, however, it is different. Energy goes into a system, flows from organism to organism, and then leaves the system. For example, with water, that water will rain, gather in a river or body of water, and evaporate, doing the cycle over and over again. Energy from the sun however, gets collected by producers, then flows to the organism that eats the plant, then flows to the organism that eats that organism, and so on. The energy does not return to the sun, it just leaves the system (like for example when an organism dies).

Somebody help ????!!!!

Answers

The answer should be d

45 / 10000 Word Limit Question 2 (b) The membranes of both B cells and the cancer cells are largely composed of phospholipids. Explain how, when the membranes are fused, the polar parts of the phospholipids from one cell will interact with the phospholipids from the other cell and how the nonpolar parts of the phospholipids from one cell will interact with the phospholipids from the other cell.

Answers

Answer:

Hydrophobic tails interact among themselves, while polar (hydrophilic) heads interact with water

Explanation:

In the first place, the polar heads of the phospholipids localized on the membrane surface interact with surrounding water molecules that also surround other cell phospholipids. Second, the non-polar tails of the phospholipids from one cell interact with molecules that repel water in the other cell phospholipid. Consequently, it forms a bilayer structure composed of two sheets of phospholipids where hydrophobic tails are arranged on the inside of the membrane, thereby allowing the interaction tail-to-tail among different cell membranes, while the polar heads of the disrupted phospholipid membranes interact together with the surrounding water.

Which is the correct ratio of Carbon Hydrogen Oxygen found in a carbohydrate? 2:21 1:1:2 0212 121​

Answers

Answer:

1:2:1

Explanation:

The ratio of carbon to hydrogen to oxygen in carbohydrate molecules is 1:2:1.

Answer:

1:2:1

Explanation:

carbohydrates have a general formular of C6H12O6.

divide all through by a common factor(I.e 6)

1:2:1

What is the closest star to the Sun?

Hint: Watch one of the SML videos on "Who wants to be a Millionaire" (Super Mario Logan).

Answers

Answer-

The closest star to the sun is Alpha Centauri A.

Answer:

already have.

Explanation:

Which statement BEST explains why the Moon is visible from the Earth?


1) The Moon reflects light from the Sun.

2) The Moon is always lit up by the Sun for us to see.

3) The Moon reflects light from the Earth.

4) The Moon produces its own light through radiation.

Answers

Answer:
The Moon is always lit up by the Sun for us to see.

Lesson 5 Student Activity Sheets: How do bacteria grow?
PREDICTION:
1. If you could zoom in really close to see what was happening on a petri dish, what do you think you
would see?

Answers

Answer:I need some points,, I hope y’all can understand

Explanation:

The growth of bacteria can be observed as the bacteria grows very rapidly and fast by the process of asexual reproduction. They continuously multiplied and in very short period of time they divided from one to thousands.

What is asexual reproduction?

Asexual reproduction is defined as the process of reproduction in which only a single parent is involved. Reproduction has been defined as the process carried out by the living organisms and during the process of reproduction the living organisms produces their own young ones and feed them. Reproduction is the supreme quality of living things.

There are two types of reproduction and these are sexual and asexual reproduction. The process of reproduction in which two parents are involved is said to be sexual mode of reproduction and the process of reproduction in which only single parent is involved in known as asexual mode of reproduction. The example of asexual reproduction are budding, fragmentation, spore formation, and binary fission.

Therefore, The growth of bacteria can be observed as the bacteria grows very rapidly and fast by the process of asexual reproduction. They continuously multiplied and in very short period of time they divided from one to thousands.

Learn more about asexual reproduction here:

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In chickens, FF produces extreme frizzle (very brittle and curly feathers), Ff has mild frizzle and ff has normal feathers. An extreme frizzle hen is mated with a normal
rooster.
Which of the following represents the phenotype ratio for their offspring?
•2 mild frizzle: 2 normal
•2 extreme frizzle: 2 mild frizzle
•100% mild frizzle
•3 extreme frizzle: 1 normal

Answers

Answer:

3 extreme on normal

Explanation:

Use a punnett square to put this question into an easy to understand visual tool.

Which of the following groups could be classified as an ecosystem?
A)The total of all plants and algae populations in a pond
B)The biotic and abiotic factors interacting in a pond
C)The fungi, bacteria, and animals in a pond
D)The light, temperature, and minerals in a pond

Answers

Answer:

The fungi, bacteria, and animals in a pond  

Explanation:

Hope this helps :)

Answer:

C) the fungi, bacteria, and animals in a pond

Explanation: Ecosystem: a biological community of interacting organisms and their physical environment:

How do you get 0 blood type?

Answers

Answer:

You cannot change your blood type. You are born with what you are biologically given and it is permanent.

Answer:

What happened was that dad and mom each passed both an O and an Rh negative to the baby. The end result is an O negative child. Each of their kids has around a 1 in 8 chance of having O negative blood. This is possible because both O and Rh- are something called recessive traits.

Explanation:

My trusty sidekick google, i hope it helps :) <3

In the question “How does pineapple consumption affect the number of digestive bacteria?”, pineapple consumption is

A) the control group B) independent Variable
C) dependent variable D) experimental group

Answers

Answer:

For the approach of how does pineapple consumption affect the number of digestive bacteria?, pineapple consumption is  the independent variable (option B).

Explanation:

The formulation of a hypothesis is not complete without the existence of the independent and dependent variables, the main variables from the research point of view.

The independent variable is one whose change or modification is capable of impacting the dependent variable, which is one that can be quantified or measured.

According to the approach, if somebody want to know how the consumption of pineapple influences the number of digestive bacteria, the independent variable is the consumption of pineapple, which can be controlled and modified, while the characteristic that is under the influence of this variable is the amount of bacteria, so that the latter is the dependent variable.

The other options do not apply because:

The experimental (D) and control (A) groups refer to the population in which the study is conducted. The dependent variable (C), in this case, is the amount of digestive bacteria.

One of the favorites to win a marathon to be held at sea level has been invited by a sponsor to train in Bolivia (very high altitude place) for three weeks before the race. The sponsor has promised to fly him to the race a day before the race. Based on your understanding of hemoglobin function, would you advice the athlete to accept the invitation or continue with his/her plans to train at low altitude

Answers

Answer: At high altitude the body will get prepared for marathon.

Explanation:

The human body is able to adapt the high altitude by long-term and immediate acclimatization.  At high altitude the lack of oxygen is sensed at the carotid arteries. It causes the increase in rate of breathing or hyperpnea.

In addition at high altitude the heart beats faster, gradually the body will also compensate itself for low availability of oxygen and get prepared for marathon.

The hypoxic zone in the Gulf of Mexico is not unique; at least 200 dead zones exist at estuaries and along seacoasts worldwide. These low-oxygen regions share many of the same causes, and they all have ecological and economic repercussions for ecosystems and people. Fortunately, we can pursue strategies to lessen the number, severity, and impacts of dead zones. The following list includes examples of factors that contribute to the development of dead zones (the cause), the consequences that result from dead zones, and possible solutions. Which of the following are consequences of dead zones?

a. Economic losses for fisher's
b. Death or aquatic organism that cannot escape
c. Policies to promote no-till agriculture
d. Construction of wetlands to absorb nutrients
e. Nutrient runoff from agriculture fertilizers, manure, and urban sources, which leads to rapid algal growth and subsequent bacterial decomposition

Answers

Answer:

Answer:

e. Nutrient runoff from agriculture fertilizers, manure, and urban sources, which leads to rapid algal growth and subsequent bacterial decomposition

Answer:

 Explanation:

Run off from agricultural wastes which contain Nitrogen and Phosphorus are the major sources  causes dead zones.The process where these chemical get washed into the aquatic bodies is called Eutrophication.

These substances leads to algae boosts in the water.The increases population of the algae consumes the available oxygen in the water, therefore making the oxygen concentration drops or no oxygen at all;(Hypoxia)

As the algae population feed on the available resources in the water they exhausted this,and later die.

When the decomposing bacteria used the oxygen in the water to breakdown the dead algae they make use of the available oxygen.This further reduced the oxygen availability and therefore   reduces the oxygen and hence the zone becomes the dead zone, because little or no oxygen is available  for survival of organisms.

This is reversible if the process if europhication or other causes  is eliminated



Explanation:

Explanation:

Based on calculations, students should have 10.4 grams of powder after conducting an experiment. The students get these results: 10.2 grams, 10.4 grams, 10.3 grams, 10.4 grams, and 10.5 grams.

Which words best describe this data?

accurate and precise
falsified and inaccurate
invalid and redundant
redundant and falsified

Answers

Answer:

accurate and precise

Explanation:

Given:

      True value  = 10.4 grams

   Measured values = 10.2 grams, 10.4 grams, 10.3 grams, 10.4 grams, and 10.5 grams.

Solution:

To a very reasonable extent, the values measured given are accurate and precise.

Accuracy is the nearness of the measured value to the true value. We can see that the measured value would have a mean of 10.36grams which is very close to the true value on approximation.

Precision is the ability to repeat a given set of values from a measurement. The measured values are quite precise.  

_________ are organisms that consume other organisms.

A:Autotrophs

B:Heterotrophs

C: Producers

D: Plants

Answers

I believe it’s B- heterotrophs
I’m pretty sure It’s B ,

help plz i will do anything

Answers

Answer:

B

Explanation:

Inertia is the tendency of an object to resist changes in its state of motion and it varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has.

Which of the following hormones can be taken orally because they are lipid-soluble and can diffuse across the digestive system wall?

Check All That Apply

Prednisone
Testosterone
Antidiuretic hormone
Insulin
Thyroid hormone
Cortisone

Answers

YUMP OKAY INSULIN THATS RIGHT YUP

The hormones that can be taken orally because they are lipid-soluble and diffuse across the digestive system wall include Prednisone, Testosterone, Thyroid hormone and Cortisone.

Steroid hormones are liposoluble hormones that can translocate through cell membranes.

Prednisone is a synthetic hormone similar to cortisone.

Cortisone is a corticosteroid hormone secreted by the adrenal glands.

Thyroid hormones are liposoluble hormones secreted by the thyroid gland.

Testosterone is a steroid hormone produced by the testicles in males and by the ovaries in females.

In conclusion, the hormones that can be taken orally because they are lipid-soluble and diffuse across the digestive system wall include Prednisone, Testosterone, Thyroid hormone and Cortisone.

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Although Natasha is a brilliant pianist snd highly acclaimed ballet dancer, her high school intelligence test scores were only average. What does Natasha’s experience suggest regarding the nature of intelligence

Answers

Answer:

It suggests she have bodily-kinesthetic intelligence according to Howard Gardener's theory of multiple intelligences.

Explanation:

Howard Gardener's theory of multiple intelligences suggests that there are eight different types of intelligence instead of a single generalized one. Bodily-kinesthetic intelligence is one of them that is the ability to skilfullly use the body or its parts.

Natasha's experience tells that she may be high on this specific kind of intelligence as athletes like her and dancers like her are high on bodily-kinesthetic intelligence.

Why don’t you get the flu when you get a flu shot?
A. You wash your hands to keep from getting the flu
B. Your body makes antibodies to keep flu away
C. Your body makes a pathogen to fight the flu
D. Your body makes a natural immunity for the flu

Answers

B is the correct answer

Which of the followmg statements is true?

A. A technology Society has no impact on the environment

B. A technology society has a completely positive impact on the environment

C. A technology society has both a positive and a negative impact on the environment

D. A technology society has a completely negative impact on the environment

Answers

Answer:

C

Explanation:

C. A technology society has both a positive and a negative impact on the environment

SSESSMENT QUESTIONS
? Which of the following is the best description of the process shown in the image below?
Ada
co
Output
CHO
Coger and share inouts the carbon dicede and glucose are outouts.
Bercer carbon diode and light are nous and glucoses the aut
coded here is leger and glucose are tots

Answers

Image attached

Answer Options

A. Water and oxygen plus light produce carbon dioxide and glucose.

B. Water, oxygen and carbon dioxide plus light produce glucose.

C. Water and carbon dioxide plus light produce oxygen and glucose.

D. Glucose and oxygen plus light produce carbon dioxide and water.

Answer:

C. Water and carbon dioxide plus light produce oxygen and glucose.

Explanation:

The image shown shows a chloroplast, with light, CO2 and water producing C6H12O6 and oxygen. This is the process of photosynthesis, where green plants make sugar from carbon dioxide and water using the energy in sunlight.

Answer:

C.

Explanation:

Answer on gizmos

which of the following is considered a condition of the nervous system and not a disease of the nervous system?
celebral palsy
epilepsy
multiple sclerosis
parkinson's ​

Answers

im not sure since it’s kind of hard to identify which one is not a disease they’re all related to the nervous system but i narrowed it down to either the top two, i hope it helps somehow :)

7. What is the speed of the sound in air of 250 C temperatures
A. 336m/s B.325m/s
C.346m/s
D.355m/s
8. Calculate the speed of sound if the temperature of the vibrating water is28-
A.346m/s
B.347.8m/s
C. 350m/s
D.349.1m/s
9. An echo occurs when sound
A. is trarismitted through a surface
B. is reflected from a distant surface.
C. changes speed when it strikes a distant surface.
D. all the above
10. The change in direction of a sound wave around corners is called
A. diffraction B. interference
C. refraction
D. reflection
11. You can hear noises a long distance away over water at night because
A. of lowered temperature. B. water conducts sound better at night. C. Sound is reflected off water more e
night. D. Of refraction of sound in air.
12. What is the BEST reason why a lot of people love to sing inside the bathroom?
A. because of privacy
B. because the bathroom creates an aurally pleasing acoustic environment
C. because of resonance
D. because the small dimension of the bathroom makes someone comfortable
13. The technique used by bats to find their way or to locate food is
B. RADAR
C.ECHOLOCATION
D. FLAPPING
A. SONAR
14. What kind of wave is sound wave?
A. shock wave.
B. standing wave.
C. transverse wave.
D.longitudinal wave.
15. When does resonance occur?
A. when objects of different natural frequencies are forced to produce vibration
B. when objects vibrate
C. when sound is reflected
D. when one object vibrates at the same natural frequency of a second object​

Answers

Answer:

i think is c

Explanation:

Which is one of the purposes that technology serves in science?
O It illustrates complex systems.
It helps create new science problems.
It assists in data collection.
O It simplifies representations of real objects.

Answers

Answer:

Explanation:

It illustrates complex systems

Answer:

C) It assists in data collection.

Explanation:

trust me bro

To which groups do most of the unknown species belong?

Answers

Answer:

insects and fungi

Explanation:

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Provide the conjugations of Haber in the present perfect tense AND the past perfect tense and describe when to use both tenses. pls help meeeeeeeeeeee!! The horizontal surface on which the block slides is frictionless. The speed of the block before it touches the spring is 6.0 m/s. How fast is the block moving at the instant the spring has been compressed 15 cm The ELEMENTS of design include:O Line, Contrast, Variety, and SymmetryO Line, Shape, Color, Space, and ValueO Shape, Repetition, Color, Line, and PatternLine, Balance, Contrast, and Space Derivation 1.2 showed how to calculate the work of reversible, isothermal expansion of a perfect gas. Suppose that the expansion is reversible but not isothermal and that the temperature decreases as the expansion proceeds. (a) Find an expression You are playing a video game. For each diamond you collect, you earn 110 points. You also earn 80 bonus points by completing the level in less than 2 minutes. 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Who is the boy in the chair? *O A. a strange boyO B. the innkeepers' sisterO C. Charlie's own sonO D. Fiona's new friend where do cells store waste Make a list of climates and natural vegetation of Asia. Un turista francs se pierde en la Ciudad de Mxico. Va caminando por una avenida en direccin al sur. Al doblar a la izquierda y seguir caminando se da cuenta de que est equivocado, se regresa y da vuelta a la derecha; contina y vira otra vez a la derecha. Qu punto cardinal est detrs de l? Diffusion is the movement of molecules from an area of high concentration of molecules to an area with a ____ concentration.A. EqualB. Higher C. LowerD. None of the above If CDEF KLMN, what are the congruent corresponding parts? A. Sides: CDLM,DEKN,EFKL,CFMN;Angles: CN,DM,EK,FL B. Sides: CDKL,DELM,EFMN,CFKN;Angles: CK,DL,EM,FN C. Side: CDKN,DEMN,EFLM,CFKL;Angles: CL,DK,EN,FM D. Sides: CDMN,DEKL,EFKN,CFLM;Angles: CM,DN,EL,FK HELPPPPPP NEEDED NOWW WILL MARK BRAILEST IF CORRECT!! New Technology Leads to Bigger CitiesIn the 1800s, the Uniodd States was still a very young nation, trying to solidify its identity. The Industrial Revolution began in Great Britain, a fast development ofsociety following the introduction of machines. The United States was slower than Great Britain to fully embrace the changes. Yet key technological developmentscaused a rapid growth in American urban areas.Better farming methods and tools in the 1800s increased food production. Americans were able to grow enough food for their families as well as to sell. Theabundance caused food prices to fall.The expansion of cotton and the growth of textile factories in northern states helped produce the first wave of American industry. More people turned to work innorthern factories as a way to support their families. Thousands of immigrants to the United States also settled in or near port cities, looking for work. Even today,the need for work is a common reason people move to urban areas.As a result, cities grew in numbers of people and physical space. As more people and businesses moved in, they needed buildings for living and working. They needed ways to move around the city. We call this process urbanization,In 1820, the United States had only a few cities of 10,000 residents or more. About seven percent of U.S. residents lived in urban areas. The number of cities withmore than 10,000 people grew quickly over the next 40 years, especially in the Northeast and Midwest. By 1860, about 20 percent lived in cities. Philadelphia andNew York City were the most populated cities in 1860 and would soon reach one million residents.The urbanization of the United States quickened due to technology improvements. Without innovations in food production, the factories could not have grown soquickly. The trend quickened after 1860 and continued throughout the 21st century as well. 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For a simple random sample of 30 of the returns audited by Mr. Jones last year, an average of $340 in extra taxes was collected. Required:Assuming a normal population of extra taxes collected with a standard deviation of $90, do the suspicions against Mr. Jones appear to be justified? You should not schedule _____ tasks for the same day.yearlydailyweeklymonthly Facilitated diffusion is a form of passive transport and involves the movement of molecules (like glucose) that are too large to just go through the cell membrane without help. These larger molecules move through the cell membrane from High concentration to Low concentration with the help of _____________________________. What effect did the Sumerians beleve their gods had oneveryday ife? Think about nature, job and social structure asyou prepare an answer. Using the space provided explainyour answer in a minimum of four sentences.I might be able to Venmo you if you help just put your username with it