Answer:
contains salt
Explanation:
List the quality control measures taken to ensure contamination does not occur during the Chelex extraction process (DNA extraction) and give reason
Answer and Explanation:
To promote a good DNA extraction through the Chelex extraction protocol, it is important to follow some measures, which are essential for the entire process to take place efficiently.
The most important measure is to avoid contamination. In this case, all surfaces, container and substances used must be properly sterilized, preventing unnecessary elements from coming into contact with the DNA sample or the protocol reagents.
It is important that the researcher is wearing clean, appropriate clothing and gloves when using this protocol. This avoids impurities and contamination with the researcher's DNA.
Another precaution must be taken with the DNA sample and the reagents that will be used during the extraction. All must be stored correctly, preventing their degradation, especially the DNA, which is a very unstable molecule.
Finally, the researcher must strictly follow all the steps of the protocol as indicated.
Two nucleotide sequences found in two different species are almost
exactly the same. What does this suggest about these two species?
Answer:
May have similar evolutionary histories.
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Explanation:
which of the following is not possible consequence of surface meaning?
An antibiotic kills 99.9% of a bacterial population. You would expect the next generation of bacteria Group of answer choices to be just as susceptible to that antibiotic as was the previous generation. to be more resistant to that antibiotic. to be more contagious than the prior generation. to die out due to the drastic decrease in population size.
to be more resistant to that antibiotic
if an antibiotic eliminates 99.9% of the germs. It makes sense to assume that the new strain of bacteria will be more resistant to that drug than the old strain. Here the correct option is A.
The majority of the susceptible bacteria in the population are killed by the addition of a bactericidal antibiotic, while the resistant bacteria continue to exist. Only the resistant bacteria will continue to grow and multiply while being exposed to the antibiotic.
Antibiotic misuse, overuse, and ineffective infection prevention and control all contribute to the acceleration of antibiotic resistance. At all societal levels, actions can be made to lessen the effects and contain the spread of resistance.
Thus the correct opion is A.
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Match the hominin with the best description.
Late Pleistocene hominins found only in Europe, Western Asia, and Central Asia; the Shanidar site belongs to this group.
Middle Pleistocene hominin; found in Africa, Asia, Europe; shows a mixture of features from previous and later hominins.
Answer:
- Late Pleistocene hominins found only in Europe, Western Asia, and Central Asia; the Shanidar site belongs to this group: Neandertals
- Middle Pleistocene hominin; found in Africa, Asia, Europe; shows a mixture of features from previous and later hominins: Homo_heidelbergensis
Explanation:
Neandertals represent an extinct hominid lineage and the closest evolutionary relatives of humans. Neandertals lived in Europe, Central Asia, the Middle East and western Siberia. This group of extinct hominids appeared around 130,000 years ago until their extinction, approx. 40,000 years ago. On the other hand, Homo_heidelbergensis is an extinct group of Homo_Hominids who lived during the Middle Pleistocene, a time period spanning 780,000-120,000 years ago. Homo_heidelbergensis is considered the most recent common ancestor between H. sapiens (modern humans) and Neanderthals. This species (Homo_heidelbergensis) combined primitive features (e.g., a wide face, and thick arching brow ridges) with modern features (e.g., a large brain capacity).
Why do all microorganisms produce pyruvate via glycolysis?
a-Evolution
b-All microorganisms do not produce glucose via glycolysis,
there are alternate pathways that produce glucose.
c-Alternate pathways exist where glucose is directly converted to acetyl-CoA
d-All microorganisms do not produce pyruvate via glycolysis, there are alternate pathways that produce pyruvate.
e-Pyruvate is necessary for all dephosphorylation reactions in cells.
Answer:
B) All microorganisms do not produce glucose via glycolysis,
there are alternate pathways that produce glucose.
The branch shown below has FOUR individual leaves. Use the dichotomous key to identify the tree’s genus and species.
A.Albizia julibrissin
B.Cornus florida
C.Juglans nigra
D.Pinus taeda
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Pseudomonas putida is used for fermentation of the lactose present in cheese whey. The bacteria are cultivated in a steady-state chemostat with sterile feed and at a dilution rate of D = 0.28 h-1. The lactose concentration in the feed and the effluent are S0 = 2.0 g/L and S = 0.10 g/L, respectively. The following information is available: YX/S = 0.45 g X/g S, YX/O2 = 0.25 g X/g O2, and C* = 8 mg/l (saturation DO). a. Determine the steady-state biomass concentration (X) and the specific rate of oxygen consumption (go2) b. What should be the oxygen transfer coefficient (Kia) to overcome oxygen transfer limitations if the desired DO concentration in the fermentation medium is 2 mg/l?
Answer:
Explanation:
Given that:
The dilution rate D = 0.28 h⁻¹
The concentration of lactose in the feed [tex]S_o = 2.0 \ g/L[/tex]
The effluent S = 0.10 g/L
Also;
[tex]Y_{X/S} = 0.45 g\ X/g \ S , \\ \\ Y_{X/O2 }= 0.25 g \ X/g \ O2, \\ \\[/tex]
Saturation C* = 8 mg/l
To calculate the steady-state biomass, we use the formula:
[tex]X = Y_{X/S}(S_o-S_e) \\ \\ X = 0.45(2.0 -0.10) \ g/L \\ \\ X= 0.45 (1.9) \ g/L \\ \\ X = 0.855\ g/L \\ \\ X = 855 \ mg/L[/tex]
The biomass is 0.855 g/L
For a steady-state condition, the oxygen uptake rate can be illustrated by using the formula:
[tex]q_{o_2}X =\dfrac{\mu_X}{Y_{X/O_2}}[/tex]
where;
[tex]\mu =[/tex] dilution rate (D)
Thus, the steady-state can be expressed as:
[tex]q_{o_2}X =\dfrac{D}{Y_{X/O_2}}[/tex]
[tex]q_{o_2}X =\dfrac{0.28}{0.25}[/tex]
[tex]q_{o_2}X =1.12 \ h^{-1}[/tex]
The specific rate of oxygen consumption [tex]q_{o_2}X =1.12 \ h^{-1}[/tex]
b)
In the fermentation medium, if the desired DO concentration [tex]C_L[/tex] = 2 mg/L
Here, the oxygen transfer is regarded as the rate-limiting step.
As such, the oxygen transfer rate(OTR) is equivalent to the oxygen uptake rate.
In this scenario, let's determine the oxygen transfer coefficient [tex](K_{La})[/tex] by using the formula:
[tex]OTR = K_{La}(C^* - C_L)[/tex]
where;
[tex]K_{La}[/tex]= coefficient of oxygen transfer
C* = saturation
Since [tex]OTR = q_{O_2}X[/tex]
[tex]q_{o2}X = K_{La}(C^*-C_L) \\\\ (1.12 )(855) = K_{La}(8-2) \\ \\ 957.6 = K_La (6) \\ \\ K_{La}= \dfrac{957.6}{6} \\ \\ K_{La} = 159.6 \ h^{-1}[/tex]
Thus, the oxygen transfer coefficient [tex]K_{La}[/tex] = 159.6 h⁻¹
An example of transamination is finding a brand new sports car in your driveway with your name on it. removing a phosphate group from a molecule. removing an amino group and putting it into the bloodstream for the kidneys to discard. removing an amino group from one molecule and binding it to a different molecule.
Answer:
removing an amino group from one molecule and binding it to a different molecule.
Explanation:
Biological macromolecules can be defined as a very large molecule (structure) that comprises of covalently bonded organic atoms and smaller molecular structures (monomers).
Biological macromolecules are categorized into four main categories and these includes;
I. Lipids.
II. Carbohydrates.
III. Nucleic acid.
IV. Proteins.
Generally, proteins comprises of amino acids and it is responsible for maintaining the proper functioning of the body system.
Transamination can be defined as a biochemical process which typically involves the removal of amino groups from amino acids and transferring them to a ketoacid (amino acid without an amine group), so as to form new amino acids.
Basically, transamination is a reversible oxidation-reduction reaction that is responsible for the deamination of amino acids.
Hence, an example of transamination is removing an amino group from one molecule and binding it to a different molecule.
Synovial joints have the greatest range of flexibility and motion.
Please select the best answer from the choices provided.
T
F
Answer: The answer is true
Answer:
true
Explanation:
true
A group of students prepared a table listing the types of reproduction that occur in
several organisms.
Organism
Type of Reproduction
Amoebas
Yeasts
Cats
Asexual reproduction
Both sexual and asexual reproduction
Sexual reproduction
Both sexual and asexual reproduction
Sexual reproduction
Both sexual and asexual reproduction
Hydras
Frogs
Ferns
Based on this information, which of the organisms can produce offspring that are
genetically identical to the parent organism?
A Ferns only
B Amoebas and yeasts only
C Cats, hydras, frogs, and ferns only
D Amoebas, yeasts, hydras, and ferns only
Based on this information, the organisms that can produce offspring that are genetically identical to the parent organism are ferns only. The correct option is A.
What is reproduction?The generation of descendants is reproduction. Asexual reproduction and sexual reproduction are the two main types. An organism that reproduces sexually incorporates the genetic material from both of its parents and is genetically distinct.
Asexual reproduction creates genetically identical kids by having one parent replicate itself. The generation of plants that we recognize as ferns or horsetails are sporophytes.
Typically, the summer is when the sporophyte releases its spores. For spores to germinate and develop into gametophytes, they need to land on a suitable surface, like a damp, protected place.
Therefore, the correct option is A. Ferns only.
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Why does sexual reproduction increase the genetic variation in a species
Answer:
Sexual reproduction provides genetic diversity because the sperm and egg that are produced contain different combinations of genes than the parent organisms. ... So in order to form a new organism, two gametes -- the sex cells, sperm and egg -- must fuse, further mixing the genes to produce more genetic diversity.
EASY 50 POINTS!!!!!!!! PLEAAASEEE ANSWER AS SOO AS POSSIABLE
Answer:
1 is a
2 is c
3 is d
4 is e
5 is b
Answer:
A is Population. B Gene. C Species D Heterozygous. E Allele
Stable salt densities in the oceans keep the earth's climate in balance. What factor causes salinity in the ocean to increase?
Answer: evaporation, ice melting, precipitation, and ice formation.
Explanation:
Salinity refers to the amount of salt water that can be found in a body of water.
It should be noted that the salinity of a water body can be affected by evaporation, ice melting, precipitation, and ice formation.
The salinity of seawater can be increased through evaporation due to the fact that when the water evaporates, this will lead to the salts being left behind, and this will then increase the salinity.
Where are blood type proteins located?
Answer:
Red blood cell antigens can be sugars or proteins
Blood group antigens are either sugars or proteins, and they are attached to various components in the red blood cell membrane.
Some experts attribute the increase in ADHD diagnoses to an increased awareness of the disorder, while others attribute the increase to ______ diagnoses.
Answer:
incorrect
Explanation:
Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders affecting children. ADHD is characterized by different behaviors that include one or more of the following symptoms: inattention (poor concentration), impulsivity (interrupting behavior) and hyperactivity (state abnormally active). It has been reported that DHD diagnoses in children between 4 and 17 years of age dramatically increased from 6 percent (6%) during the period 1997-1998 to 10 percent (10%) during the period 2015-2016. Although the causes of this increase have not been established, the American Psychiatric Association (APA) indicates that the increase might be due to the increased access of communities historically relegated to receive care and decreased stigma to be diagnosed with ADHD. Other possible causes range from chemical factors to unhealthy habits during pregnancy (e.g., smoking, substance abuse, poor nutrition). On the other hand, it has also been proposed that this increase may be as a result that ADHD is often misdiagnosed and confused with other conditions (e.g., bipolar disorder, autism, kids being kids, etc).
Which of the following is an example of confirmation bias?
A. A researcher is studying the college readiness of American teens. He interviews 200 urban male teenagers from Philadelphia and finds that 85% say they are ready for college. The researcher concludes that 85% of all teenagers in America are ready for college.
B. An oil company has research done on the effects of drilling on the environment. It is found that in 87% of cases, there is a negative effect. The oil company only publishes the 13% that show a positive effect, or no negative effects.
C. A journalist who does not think climate change is real is writing an article about climate change. In his article he cites one article that discusses how humans cannot be causing climate change, and ignores several other articles that discuss how humans can cause climate change.
D. A pharmacologist is studying the effect of certain drugs on humans, and tells the test subjects that the drug may cause headaches. Some of the subjects are given the drug, and some are given placebos (sugar pills) instead. Then the number of headaches is counted.
Answer:
C
Explanation:
the journalist already has an opinion on the matter, and only uses sources that confirm his opinion and ignores anything that says he is wrong. His bias affects his findings.
what system produces most of the hormones in the human body
The hormones created and released by the glands in your body's endocrine system control nearly all the processes in your body
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Answer:
The endocrine system.
Explanation:
It's a group of glands that produce and secrete hormones that the body uses for a variety of purposes.
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The table below shows the use of some energy production methods over time.
Type of energy Average energy used annually in the past (in million tons) Average energy used annually at present (in million tons) Average energy most likely to be used annually in the future (in million tons)
Oil 200 4000 300
Gas 100 2500 700
Coal 1000 2500 1500
Wind 0.1 50 2000
Hydropower 0.7 60 150
Tidal power 0.02 50 500
Based on the table, which of these statements best describes the impact of different methods of energy production on the environment in present times?
Wind energy may be altering all shorelines on Earth.
Hydropower may be altering all shorelines on Earth.
Tidal power may not be contributing significantly to climate change.
Coal energy may not be contributing significantly to climate change.(Not this)
Answer:
I think its hydropower
Explanation:
Lucas places 20 kg samples of each substance by the same heat source all samples are at the same initial temperature which sumvstance will have the greatest temperature after some period of time
Answer:
Metallic structure with black colour body.
Explanation:
The substance has metallic structure and black colour body will have greatest temperature among other substances because metallic structure and black colour of body heat up very quickly. Metals have free electrons which make it the best conductor of electricity and heat while on the other hand, black colour is a good absorbent which absorb heat very quickly so that's why we can say that metallic solids are the substance that have the greatest temperature.
Answer:
copper
Explanation:
it copper because it have less specific heat (j/kgoc)
your friend says that humans have evolved from apes.
Which organism in the food chain is impacted the most by Biomagnification
What almost happened to the island foxs and why?
they almost went extinct, about 90% of the fox population was recently lost due to canine distemper virus
how do you justify the statement"biologists have wide choice of career"?
Answer: Due to the fact that biologists have a wide range of topics to research
Explanation:
Where are the neutrons located in the atom? O In the nucleus O Around the nucleus
Answer:
in the nucleus
Explanation:
they are found in it
hermoglobin is a protein that binds to oxygen. it is only produced by red blood cells and it allows blood to transport oxygen throughout the body. what statement does this information best demonstrate?
Answer:
it is lungs as the answer because you are to lazy
if 15% of the nucleotide in a DNA molecule contains guanine, what percentage of the nucleotides contain each of the other bases? Explain your answer. What scientist discovered this "rule"?
From what you know of tonicity, what can you say about the plant cells and the solutions in the test tubes
Answer:
Tonicity is the relative amount of solutes that is dissolved in solution which determine the direction and level of diffusion.
Explanation:
Tonicity is the relative amount of solutes that is dissolved in solution which determine the direction and level of diffusion. There are three types of tonicity i.e. hypertonic, hypotonic and isotonic solution. If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink due to more solute in the external environment. In an isotonic environment, there is no water movement occurs, so there is no change in the size of the cell. When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell. due to lower amount of water present inside the cell.
Mike is studying the phylogenetic tree for big cats.
A big cat phylogenetic tree is shown. A bracket goes to clouded leopard and to another bracket. That bracket goes to 2 additional brackets. One bracket goes to tiger and snow leopard. The other bracket goes to janguar and another bracket. The other bracket has lion and leopard.
He made several statements about the tree. Which statement is not true?
The leopard is more closely related to the jaguar than to the snow leopard.
The leopard is more closely related to the tiger than to the clouded leopard.
The leopard is more closely related to the snow leopard than to the clouded leopard.
The leopard is more closely related to the tiger than to the snow leopard.
Answer:
D
Explanation:
edg 2022
The history of science is full of great works that have marked a turning point in the development of a branch of knowledge, and in which the proposals for a new theoretical frame of reference or a new systematization of the known facts. Explain this argument thoroughly with example
Answer:
The cell theory
Explanation:
The modern cell theory states that 1-all living things are composed of cells, 2-all cells derive from pre-existing cells by cellular division, and 3-the cell is the structural and functional unit of all life forms. Many researchers contributed to the development and formulation of the modern cell theory. First, the invention of the optical microscope, followed by the improvement with lighting by Robert Hooke (1660) and observation of microscopic organisms by Antonie van Leeuwenhoek (1675) contributed to the observation of cellular structures that previously were unknown. Subsequently, the cell theory was proposed by Schleiden and Schwann (1839) who suggested that all life forms are composed of cells (the fundamental unit of life). Subsequently, the theory was expanded by Virchow (1855) who proposed that all cells arise from pre-existing cells. Thus, the modern cell theory is the result of the scientific work of many researchers that have contributed across centuries in order to collect a body of knowledge (both experimental and observational) that supports the statements resumed in this theory. Nowadays, it is impossible to conceive biology as a scientific discipline without making reference to the modern cell theory.
Science brings knowledge and explanation to everything that surrounds us, one of the most impactful theories is the evolution of species by Charles Darwin.
What does science bring to the world?Science allows humanity to understand a little more about nature, science is important in our life because it helps us to have a better quality of life, because through science many diseases have been eliminated. Science enables advances in health, food, energy and others.
Whit this information , we can conclude that Science brings knowledge and explanation to everything that surrounds us, one of the most impactful theories is the evolution of species by Charles Darwin.
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