Approximately how many nephrons does a kidney have?
A.
billions
B.
one million
C.
one
D.
100
Answers
Answer:
nephron, functional unit of the kidney, the structure that actually produces urine in the process of removing waste and excess substances from the blood. There are about 1,000,000 nephrons in each human kidney.
Related Questions
What is an oxidizing agent ?
Answers
Answer:
A substance that tends to bring about oxidation by being reduced and gaining electrons
Explanation:
Answer:
An oxidizing agent is a substance that takes negatively charged electrons "away" from a substance or object; usually taking these electrons for itself it can also transport the electrons from an object and "give" them to another substance or object. The object that has been oxidized will then have a positive charge after losing the negative electrons and the substance receiving the electrons will become negative.
Explanation:
Examples include halogens, potassium nitrate, and nitric acid.
Which number on the diagram is labeling the large intestine?
a. 4
b. 5
c. 2
d. 3
Answers
Answer:
5 would be the large intestine
Explanation:
How many atoms of titanium are in 0.085 mol of titanium
Answers
Answer:
5.12x10^23 atoms
Explanation:
To find atoms, you need to use Avogadro's number. Here is the equation:
0.085 mol x 6.022x10^23 atoms = 5.12x10^22 atoms of titanium
Keep in mind that units need to cancel and make sure to double check those sig figs!
Which element has higher electronegativity: Nitrogen or Arsenic
Answers
Answer:
Definetly Nitrogen
Explanation:
Nitrogen is the most electronegative
how many grams of ice, solid h2o, can be melted with exactly 1.5 kj of heat? the heat of fusion of ice is 6.01 kj/mol, and the molar mass of ice is 18.02 g/mol. express your answer to three significant figures.
Answers
The quantity of ice, solid H₂O, that can be melted with exactly 1.5 kJ of heat, whose heat of fusion is 6.01 kJ/mol, is approximately 4.505 g.
It can be determined through the following steps.
Step 1: Determine the heat of fusion of one mole of ice. The heat of fusion of ice, which is the amount of heat required to melt one mole of ice, is given as 6.01 kJ/mol.
Step 2: Convert the heat required to melt the ice into Joules
1 kJ = 1000 J, so 1.5 kJ = 1500 J
Step 3: Determine the number of moles of ice whose heat of fusion is equivalent to the heat required to melt the ice.
The heat of fusion of 1 mole of ice = 6.01 kJ/mol = 6010 J/mol
The heat required to melt the ice = 1500 J
The number of moles of ice = Heat required to melt the ice/Heat of fusion of one mole of ice
= 1500 J/6010 J/mol ≈ 0.25 mol of ice
Step 4: Convert the number of moles of ice to grams
The molar mass of ice (H2O) = 18.02 g/mol
Mass of ice = Number of moles of ice × Molar mass of ice
= 0.25 mol × 18.02 g/mol≈ 4.505 g
Therefore, the quantity of ice, solid H₂O, that can be melted is approximately 4.505 g.
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Suppose you want to search for high-redshift star-forming galaxies using a telescope equipped with a spectrograph able to measure the entire optical spectrum (400-700 nm). Star-forming galaxies contain copious hydrogen gas, from which stars form. Some of this gas will be ionized by the newly-formed stars; the spectra of star-forming galaxies there exhibit bright hydrogen lines in emission. Light from the newly-formed stars is absorbed by neutral hydrogen gas as it passes through the galaxy. a) If you wish to search for Lyman-a emitting galaxies, over what redshift range can you find such galaxies? [3 points] b) If you detect only one line, you cannot be certain that this line is the Lyman-a line, and hence that the galaxy is indeed at the computed redshift. Assuming you can also observe in the infrared (wavelengths >700 nm), how can you change your strategy to make sure that the line you detect is really the Lyman-a line? Give three examples of how you can increase confidence in the correct identification of the Lyman-a line considering only hydrogen gas. [3 points] c) Limited only to optical wavelengths and considering only hydrogen gas, what strategy should you adopt to be certain that the line you detect is really the Lyman-a line while maximizing the redshift range over which you find galaxies? With this strategy, over what redshift range can you find star-forming galaxies? Justify through appropriate computations and reasoning that this is in fact the optimal strategy for maximizing the redshift range of your search. [10 points] d) Apart form hydrogen emission lines, star-forming galaxies also usually exhibit bright [OIII] forbidden lines. Why can such lines be seen from interstellar gas but not the Earth's atmosphere or in the laboratory? [4 points]
Answers
a) The maximum observable range of redshifts that produces Lyman-alpha line is 0 ≤ z ≤ 10.6
b) i) identifying the galaxy with a radio source, ii) looking for other Lyman lines, iii) a coincidence with a continuum break
c)The maximum redshift range over which galaxies can be found using this strategy is z = 7 to z = 15.5.
d)Earth's atmosphere absorbs the radiation, and the laboratory conditions are not the same as interstellar conditions.
a) Lyman-alpha line is produced by the hydrogen atoms that have electrons that are in the ground state being raised to the first excited state. Over a certain range of redshifts, the Lyman-alpha line is redshifted to longer wavelengths that are observable by an optical spectrograph. The maximum observable range of redshifts that produces Lyman-alpha line is 0 ≤ z ≤ 10.6 (depending on the exact details of the galaxy's emission profile).
b) Observing the galaxy in the infrared can help in the identification of the Lyman-alpha line as it is shifted to longer wavelengths. Three ways to increase confidence in the correct identification of the Lyman-alpha line are:
i) identifying the galaxy with a radio source, ii) looking for other Lyman lines, iii) a coincidence with a continuum break.
c) The strategy that needs to be adopted is to look for the Lyman limit, which is the point at which the spectrum is cut off by the absorption of all hydrogen in the galaxy. To be certain that the line you detect is the Lyman-alpha line, you need to look for a decrement in the flux of the galaxy at wavelengths shorter than the line and a decrement in the flux at wavelengths longer than the line. This is because the Lyman limit will be shifted to longer wavelengths at higher redshifts, so to maximize the redshift range over which galaxies can be found, you need to search for the Lyman limit at the longest wavelength possible. The maximum redshift range over which galaxies can be found using this strategy is z = 7 to z = 15.5.
d) The reason why such lines can be seen from interstellar gas but not the Earth's atmosphere or in the laboratory is that the Earth's atmosphere absorbs the radiation, and the laboratory conditions are not the same as interstellar conditions. The forbidden lines from the interstellar gas are not affected by dust absorption because they are produced in regions where dust is not present.
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gentian violet is a dye using in dna gel electrophoresis it is yellow in strongly acidic solutions and purple in solutions ______
Answers
Gentian violet, a dye used in DNA gel electrophoresis, exhibits a yellow color in strongly acidic solutions and turns purple in solutions with higher pH levels, such as neutral or basic solutions. This color change aids in the visualization of DNA fragments during the gel electrophoresis process.
Gentian violet is a common dye used in DNA gel electrophoresis to stain DNA bands. It is a cationic dye that binds to DNA molecules, making them visible under UV light. Gentian violet appears yellow in strongly acidic solutions and purple in solutions with a higher pH. During electrophoresis, the DNA is separated by size and charge, resulting in distinct bands on the gel. Gentian violet stains these bands, allowing scientists to visualize the DNA fragments. However, excessive use of gentian violet can damage DNA, so it is important to use it in moderation. In summary, gentian violet is a vital tool for DNA analysis, but its use must be carefully controlled to prevent any negative effects on the DNA samples.
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What are the 3 components of an expressway that allows car to enter onto the road?.
Answers
3 components of an expressway are :
Acceleration Lane
Merging Area
Slow Lane
Safety design features of an expressway:
Safety elements on the freeways include lane separators and shoulders. Broad, clearly indicated lanes: Highway lanes are broad and feature distinct markings. The inside edge of paved shoulders often has elevated or grooved patterns called "rumble strips" that are typically found alongside major highways.
What are expressways designed for?
Instead of the current practice of every business or establishment connecting the main roadway, access restricted roads have a limited number of designated entry and exit points. Coming onto the main highway is done via segregated service roads.
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What neutral atom has a nuclear charge of +9, and a nuclear mass of 19 amu? How many neutrons does it have. How many electrons does it have ?
Answers
The neutral atom with a nuclear charge of +9 and a nuclear mass of 19 amu is fluorine-19. It has 10 neutrons and 9 electrons.
The atomic number of an element is equal to the number of protons in its nucleus. Therefore, if an atom has a nuclear charge of +9, it means it has 9 protons. The nuclear mass of an atom is the sum of its protons and neutrons. Since we know the nuclear mass of this atom is 19 amu, and it has 9 protons, it must have 10 neutrons (19 - 9 = 10).
To determine the number of electrons, we need to know the charge of the atom. Since it is a neutral atom, it has no net charge. This means the number of electrons must be equal to the number of protons, which is 9.
Therefore, the identity of the neutral atom is fluorine-19, with 9 protons, 10 neutrons, and 9 electrons.
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How many moles is 78.0 grams of sodium?
Answers
Answer:3.39
Explanation:
How many valence electrons are in each family of elements?
(Boron, Carbon, Neon)
Answers
It has 8 valence electrons.
The valence electrons in each family of elements are:
Boron, Carbon, and Neon are elements that belong to different families.
Boron and Carbon are members of the Carbon family, while Neon is part of the Noble gas family.
They have a varying number of valence electrons.Boron has three valence electrons in its outermost shell.
Carbon has four valence electrons in its outermost shell.
Neon has eight valence electrons in its outermost shell.
Hence, the number of valence electrons in Boron, Carbon, and Neon are 3, 4, and 8, respectively.
Also, we can say that each family of elements has a specific number of valence electrons that help to determine their chemical and physical properties.
The number of valence electrons can be easily found using the Group number of the element in the periodic table.
The Group number of an element represents the number of valence electrons an element has.
For example, Boron and Carbon are present in Group 13 and Group 14, respectively, which means they have 3 and 4 valence electrons.
Neon, on the other hand, is present in Group 18, and it has 8 valence electrons.
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atoms from different element combine to form
Answers
Answer:
new substances
Explanation:
Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.
how many moles are in 78.4g of mgcl2
Answers
Answer:
moles = 0.83
Explanation:
A water and lithium bromide solution that is exposed to air becomes ______.
Answers
A water and lithium bromide solution that is exposed to air becomes hygroscopic.
Hygroscopic substances have a strong affinity for water and readily absorb moisture from the surrounding environment, including air. Lithium bromide is known to be a hygroscopic compound, meaning it attracts and absorbs water molecules from the air.
When a water and lithium bromide solution is exposed to air, the hygroscopic nature of lithium bromide causes the solution to absorb water vapor from the air, resulting in an increase in the water content of the solution. This absorption of moisture can lead to the solution becoming more concentrated over time.
The hygroscopic property of lithium bromide is often utilized in air conditioning systems, where the solution is used as an absorbent to remove moisture from the air.
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Using immunoprecipitation, you can isolate a protein (protein X) you think is involved in chronic myelogenous leukemia (CML), which is caused, in part, by a hyperactive tyrosine protein kinase called ABL. You think one of the targets of ABL is the protein X that you can purify. In comparing tissues with and without the disease, you subject the samples to isoelectic focusing. Understanding how IEF works, how would you expect the samples with CML to migrate compared to the wild type, non-diseased sample protein?
A. The phosphorylated protein will have a lower isoelectric point and thus migrate further toward the anode.
B. The phosphorylated protein will be more attracted to the negative charge on the anode.
C. The non-phosphorylated proteins from the non-diseased samples will move further to the anode without the bulky phosphate group attached to a tyrosine.
D. Non-diseased proteins will migrate with a lower pl than those from diseased tissues and thus the samples from the non-diseased samples will migrate more to the anode than diseased protein.
Answers
The non-phosphorylated proteins from the non-diseased samples will move further to the anode without the bulky phosphate group attached to a tyrosine. The correct option is C.
Isoelectric focusing (IEF) is a technique used to separate proteins based on their isoelectric points (pI), which is the pH at which a protein has a net neutral charge. During IEF, proteins migrate in an electric field through a pH gradient until they reach a region of the gel where the pH matches their individual pI, resulting in immobilization.
In the context of chronic myelogenous leukemia (CML), where the hyperactive tyrosine protein kinase ABL is involved, the phosphorylation of proteins plays a significant role. Phosphorylation refers to the addition of a phosphate group to a protein. Phosphorylated proteins generally have a different charge distribution compared to non-phosphorylated proteins.
In this scenario, it is likely that protein X, which is suspected to be a target of the hyperactive ABL kinase, would be phosphorylated in the samples with CML. The addition of a phosphate group to the protein alters its charge distribution, leading to a change in its pI. Therefore, the phosphorylated protein X would have a different pI compared to the non-phosphorylated form.
Given this information, we can deduce that the non-phosphorylated proteins from the non-diseased samples would have a lower pI compared to the phosphorylated protein X from the CML samples. Consequently, the non-phosphorylated proteins would migrate further toward the anode in the isoelectric focusing process, as they would be attracted to the region of the gel with a higher positive charge.
This aligns with option C, which states that non-phosphorylated proteins from the non-diseased samples would move further to the anode without the bulky phosphate group attached to a tyrosine.
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Why does the amplitude of a seismic wave usually decrease as the wave moves away from the epicenter?
Answers
The amplitude of a seismic wave usually decreases as the wave moves away from the epicenter due to the phenomenon of wave attenuation.
There are several factors that contribute to this attenuation:
Geometric Spreading: As the seismic wave propagates outward from the earthquake's epicenter, it spreads out over a larger area, resulting in the energy being distributed over a larger volume. This causes the amplitude of the wave to decrease with distance. According to the inverse square law, the intensity of the wave decreases with the square of the distance from the source. Absorption and Scattering: The seismic wave encounters various materials and geological structures as it travels through the Earth. These materials can absorb and scatter the energy of the wave, causing a reduction in its amplitude. Different types of rocks and soil have varying levels of attenuation, leading to differences in the decrease of wave amplitude.
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Convert 3.55 moles Nacl to formula units
Answers
Answer:
2.14 x 10²⁴ formula units
Explanation:
Given parameters:
Number of moles of NaCl = 3.55moles
Unknown:
Formula units of NaCl = ?
Solution:
A mole of substance contains the avogadro's number of particles. The number of particles could be protons, atoms, neutrons, formula units etc.
1 mole of substance = 6.02 x 10²³ formula units
3.55 mole of NaCl = 3.55 x 6.02 x 10²³
= 2.14 x 10²⁴ formula units
What characteristics do molecular formula and empirical formula share in common?
Answers
Both molecular formula and empirical formula are related to the composition of a chemical compound. The molecular formula represents the actual number of atoms of each element in a molecule, while the empirical formula represents the simplest whole number ratio of the atoms in a compound. Therefore, both formulas provide information about the types of atoms present and the relative proportions of each element.
Both molecular and empirical formulas represent chemical compounds, and they share some common characteristics:
1. Element representation: Both formulas display the elements present in the compound using their chemical symbols.
2. Ratio of elements: Both formulas provide information about the ratio of elements in the compound. The molecular formula shows the actual number of atoms of each element, while the empirical formula shows the simplest whole-number ratio of atoms.
However, it's important to note their differences too. The molecular formula gives the exact composition of the compound, while the empirical formula shows the reduced form based on the smallest whole number ratio of elements.
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How do diffusion and osmosis differ?
Thank you
Answers
Answer:
Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.
the total genetic variation (the genetic make-up) found in members of a population is called:
Answers
The total genetic variation found in members of a population is called the gene pool. The gene pool refers to the complete set of alleles (versions of a gene) present in a population.
It includes all the genetic information that is available for the population to evolve and adapt to its environment over time.
The gene pool can be affected by various factors, including natural selection, genetic drift, gene flow, and mutation. These factors can alter the frequency of alleles in the gene pool, leading to changes in the genetic make-up of the population over generations.
Understanding the gene pool is important in fields such as evolutionary biology, population genetics, and conservation biology, as it provides insight into the genetic diversity and potential for adaptation within a population.
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Observe: Look at the red lithium atom and the blue oxygen atom. Recall that most atoms are stable when their outermost ring has eight electrons. (Some atoms, such as lithium and beryllium, are stable when their outermost ring has two electrons.)
How many electrons will the lithium atom give up to become stable?
1. eight
2. seven
3. two
4. one
Answers
Answer:
4. one
Explanation:
Describe THREE things that happen at DIVERGENT plate boundaries.
HELP!
Answers
Answer:
1. Earthquakes
2. Creation of oceanic crust
3. Volcanic activity
(ocean basin also widens)
Which of the following are behavioral adaptations? Select all that apply.
A. playing dead
B. migration
C. type of teeth
D. hibernation
E. body coverings
Answers
Answer:
The 2 types of behavioral adaptation are migration, and hibernation. Explanation: Adaptation of animal is the fitness towards its environment.
Explanation:
I am worried about your proposal to install a groundwater heating system in my daughter’s school.
I don’t think that water at a temperature of 30°C has enough energy to heat the school. If the school is too cold, the students won’t be able to focus on learning.
Respond to David Li’s letter. Explain how the groundwater system could heat the air in the school.
Answers
Answer: The temperature would increase assuming it is 30 degree water causing a change in the temperature and assuming it is a seismic groundwater source you are using the earths core to heat the school so it would likely be a stable energy source. There are very few places on the planet where that warm of water is accessible without drilling really deep into the core but if it is there and is a stable fault then the energy would be consistent and stable.
The groundwater system can heat the air in the school by transferring the heat in the ambient atmosphere of school.
Groundwater heating system:
Although the temperature of the ground water is not much but the amount of groundwater is too much.
This large amount water slowly releases heat energy which is transferred in the ambient atmosphere of school.
Therefore, the groundwater system can heat the air in the school by transferring the heat in the ambient atmosphere of school.
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Im lookin for robotisgood22, so yeah, thats it
Answers
Answer:
i cant help yo with that
Explanation:
Sry
Answer:
Nope nowhere to be find
Explanation:
At a supermarket, items made from fossil fuels include _______ . A. steel food cans B. fruits and vegetables C. plastic grocery bags and food containers D. cardboard cereal boxes
Answers
Answer: Plastic bags and food containers
What does it mean if an atom has no charge
Answers
Answer:
It means that its outermost energy level is fully filled with electrons.
Explanation:
You can take an example of all group VIII elements such as noble gases, xenon, krypyon.
This atom is very stable hence cannot participate in any type of bonding.
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What is the perecentage yield of a reaction in which 200g PCl3 reacts with excess water to form 128g HCl according to the f.F reaction? PCl3 +3H2O=H3PO3+ 3HCl
Answers
Answer:
The percentage yield is 80.36% (see calculations in attachment).
Explanation:
The theoretical yield of the reaction is the amount of product that would result if all the limiting reagent reacted. The theoretical yield is calculated using the balanced equation.
In practice, the actual yield, or the amount of product actually obtained from a reaction, is almost always less than the theoretical yield.
To determine how efficient this reaction is, we need to calculate the percent yield, which describes the proportion of the actual yield to the theoretical yield. It is calculated as follows:
\( %yield = actual yield ÷ theoretical yield × 100% \)
First we need to make sure that the equation is properly balanced. In the question they provide the balanced equation.
Since water is in excess, we calculate the theoretical yield using PCl₃.
The boiling process is considered to be____
Answers
your answer is D. physical change, because a new substance is not formed.
The boiling process is considered to be a physical change as no new substance is formed.
What is a physical change?Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
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the long term survival of any species of organnism is possible only if the organisms cansm
Answers
The long term survival of any species of organism is possible only if the organisms can adapt the environment it living and to reproduce.
What is natural adaptation ?Not all kind of living things are fittest to survive in the world to live. Some of them are pray of their predators. Some are unhealthy to survive while some others are competing to find food and shelter.
There are many organisms which have some natural adaptations, like some strategies or physical peculiarities to hide from their predators and survive for ling time. For example, chameleon can hide from others by their color mimicking know as camoflouge.
The fittest one will survive and will be able to maintain their population through reproduction. Therefore, the organisms which can adapt to the environment it lives can survive for ling time.
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