Answer:
The answer is "[tex]4.875 \ \frac{mol}{l}\\[/tex]".
Explanation:
The molar absorptivity value is= 12.3 [tex]\frac {L}{mol \times cm}[/tex]
path length of cell = 1 [tex]\ cm[/tex]
Absorbance = 1.2
Using the beer's lambert law:
[tex]A = \varepsilon \ cl\ \ \ \ \ \ \ _{where} \\\\c= \frac{A}{ \varepsilon l } \\\\[/tex]
[tex]= \frac{1.2}{12.3 \times 1}\\\\= 0.0975 \ \frac{mol}{L}\\[/tex]
Claculating the concentration of the solution after dilution: [tex](m_2)= 0.0975 \ \ \frac{mol}{L}[/tex]
find out the dilution value before concentration :
The volume taken by the dilution: [tex](V_1) = 0.2\ ml[/tex]
The final volume after dilution:
[tex](V_2) = 9.8+0.2\\[/tex]
[tex]= 10 \ ml[/tex]
Formula:
[tex]\bold{M_1 \times V_1 = M_2 \times V_2} \\\\ M_1= \frac{M_2 \times V_2 }{V_1}\\\\[/tex]
[tex]= \frac{ 0.0975 \times 10 }{0.2}\\\\= \frac{ 0.975 }{0.2}\\\\ = 4.875 \ \frac{mol}{l}\\[/tex]
. Which system is responsible for taking the oxygen from the respiratory system then transporting
it all through the body and its main organ is a muscle in constant motion?
Answer:
The circulatory system
Explanation:
The main organ is the heart. The heart pumps deoxygenated blood to the lungs to be oxygenated and spread throughout the body.
1. For variation to be a meaningful contribution to evolution, what must be true?
Group of answer choices
A. The traits that vary in ways meaningful to evolution have purely non-genetic components.
B. The variation must only happen as a result of genetic mutation.
C. The traits that vary in ways meaningful to evolution have genetic components
2. Which of the following about DNA suggests that all living things have a common ancestor.
Group of answer choices
A. Only some living things use DNA as their genetic material
B. Different species use a different genetic code to code for proteins
C. all living things use the same genetic code to code for proteins
D. Different species don't share any of the same DNA sequences
All living things use the same genetic code to code for proteins .The traits that vary in ways meaningful to evolution have genetic components.The option C is correct.
Deoxyribonucleic acid is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses. DNA and ribonucleic acid are nucleic acids.
Evolution is the process by which species adapt over time in response to their changing environment.
Evolution is a process that results in changes in the genetic material of a population over time. Evolution reflects the adaptations of organisms to their changing environments and can result in altered genes, novel traits, and new species.
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Write this number showing three significant figures. Remember to round.
90,862
I am not sure the subject
Answer:
3 significant figures means simply that you only want to see 3 numbers. To make 3 numbers out of those 5 you got there, just round the 6 up and make the 8 turn to a 9.
therefore, the answer you want is 90,9
a couple visits a fertility clinic to determine the basis of their difficulty in conceiving a child. they are surprised to hear they will both be tested for levels of two of the same hormones, which play roles in the ovarian cycle and sperm production. which hormones are they? follicle-stimulating hormone (fsh) and luteinizing hormone (lh) insulin and glucagon adrenocorticotropic hormone (acth) and corticotropin-releasing hormone (crh) oxytocin and luteinizing hormone (lh)
Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are two hormones that are tested by both partners in a couple that is struggling to conceive a child. The hormones play roles in the ovarian cycle and sperm production. They are typically tested during an infertility evaluation at a fertility clinic.
The ovaries are controlled by FSH, which is produced by the pituitary gland. FSH stimulates the growth of follicles in the ovaries, which contain eggsLH triggers ovulation, which is when the ovary releases an egg. LH also stimulates the production of progesterone by the ovaries, which helps prepare the uterus for implantation of a fertilized egg.
FSH stimulates sperm production in the testes, and LH stimulates the production of testosterone, which is needed for sperm production and development.LH and FSH levels are commonly tested during a fertility evaluation because they can provide insight into a couple's fertility potential.
If LH and FSH levels are abnormal, it could indicate an underlying issue with the pituitary gland, hypothalamus, ovaries, or testes that is impacting fertility.
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The farmer's experiment was widely considered to be well-designed and well-implemented. After 8 weeks, he found no difference between groups, and the berry harvest was still lower than in previous years. What can he conclude about his hypothesis?
a. Rodents are eating the berries. b. Birds are eating the berries. c. Birds are not eating the berries. d. The results do not address the hypothesis.
The farmer cannot directly conclude anything about his original hypothesis. The lack of difference between groups and the continued low berry harvest do not provide clear evidence or support for any specific conclusion about rodent or bird behavior. The experiment's outcome indicates that the hypothesis may be invalid. The answer is (d) The results do not address the hypothesis. An experiment is a scientific process that seeks to establish cause-and-effect relationships among variables in a controlled environment.
It is designed to test a hypothesis and examine the relationship between independent and dependent variables. A hypothesis is a proposed explanation or assumption for a scientific investigation. It's a statement or assertion that requires proof through research, testing, or experimentation .The farmer's hypothesis was probably about what was causing the low yield of berries. His hypothesis was most likely not supported by his experiment's results. Since there was no significant difference between the groups and the berry harvest remained low, his hypothesis was most likely invalid. Therefore, he could conclude that his hypothesis was not supported by the experiment's results.
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A cell wall and a cell membrane are different. All cells are surrounded by a ______________ that is _________________ and interacts with the environment.
Answer:
Cell Membrane---Semi-permeable
Explanation:
All cells have cell membranes, regardless of the type, and they are all semi-permeable, or selectively permeable, which means they can regulate what enters and leaves the cell.
How many covalent bonds are found in 1 water molecule?
and
How is capillary action applicable to living things?
Which best describes the law of conservation of mass?
The coefficients in front of the chemicals in the reactants should be based on the phys cal state of the products.
Products in the form of gases are not considered a part of the total mass change from reactants to products.
When reactants contain both a solid and a liquid, the solid counts toward the overall mas and the liquid does not.
The mass of the reactants and products is equal and is not dependent on the physical state of the substances.
Answer:
The mass of the reactants and products is equal and is not dependent on the physical state of the substances.
Explanation:
You need to make sure all atoms are equal in number when balancing a chemical equation
Answer:
Explanation:D) The mass of the reactants and products is equal and is not dependent on the physical state of the substances.
Farmers make a great effort to prevent fungi from growing on their stored crops. In a pile of grain or nuts, fungi have plenty of food and living space. The best way for farmers to prevent fungi from growing is to make sure there is not enough____________ for fungi to survive and grow.
plz help, I have to get this in by noon
Answer:
humidity
Explanation:
What do animal cells have that plant cells do not have?
the matter is everything that takes space is True or false.
Answer:
TRUE
Explanation:
Which statement describes gravity
Answer:
A) Gravity is the force that pulls objects toward Earth's center.
Explanation:
i took the quiz on ed.
Answer:
B. Gravity is the force that pulls objects toward Earth’s center.
Explanation:
in the graph below is shown the relationship between the number of offspring produced and the average size of offspring produced. what is the term (two words that are hyphenated) for this relationship?
The relationship between the number of offspring produced and the average size of offspring produced is called the reproductive trade-off. What is a reproductive trade-off A reproductive trade-off refers to the compromise that organisms make between reproductive traits, such as the number and size of offspring.
Reproductive trade-offs may occur within and between organisms, as well as between traits. A trait that is beneficial in one respect may have disadvantages in another, resulting in a trade-off. Trade-offs arise because organisms must allocate their finite energy and resources to various physiological functions, such as growth, maintenance, and reproduction.
Therefore, when organisms put more resources into one physiological function, such as reproduction, fewer resources are available for others. The number of offspring produced and the average size of offspring produced is an excellent example of a reproductive trade-off.
Some species may produce a few large offspring, while others may produce many small offspring. These strategies, however, come with different costs and benefits.
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which of the following pairs is the best example of homologous structures?group of answer choicesthe shape of the dorsal fin in dolphins and the shape of the dorsal fin in sharks wings on an owl and wings on a hornet eyelessness in the australian mole and eyelessness in the north american molebones in the bat wing and bones in the human forelimb
Homologous structures are a term used to describe the similarity between structures in different organisms that have the same origin but have evolved into different functions. Thus, the best example of homologous structures is the bones in the bat wing and bones in the human forelimb.
Both the bat and human have arms with similar bones, the humerus, radius, and ulna, as well as digits with phalanges. The difference lies in the function of these structures;
the arm in the human is designed to grasp and carry objects, while the bat wing is designed for flight. These bones are considered homologous because they have the same origin but have adapted to different functions.
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mutations in either the repressor gene or the operator region of the lac regulatory system in e. coli often lead to full transcription of the three structural genes, even when no lactose is available to the organism. such mutations would be called
The mutations that would lead to the full transcription of the three structural genes in the absence of lactose, resulting in constitutive expression, are called lac operon mutations.
This effect is the result of alterations in either the repressor gene or the operator region of the lac operon regulatory system in Escherichia coli.The E. coli lac operon is a prime example of gene regulation in prokaryotic cells, which is used to control the expression of genes for lactose metabolism.
Mutations in the repressor gene or the operator region can interfere with the function of the regulatory system, resulting in constitutive expression of the structural genes, even in the absence of lactose.
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students performed a laboratory experiment where smelling lavender essential oil decreased heart rate. the students proposed a reflex pathway that included the central nervous system activating the parasympathetic nervous system. if chamomile essential oil activated parasympathetic nervous system signaling more than lavender, which would you predict?
If chamomile essential oil activated parasympathetic nervous system signaling more than lavender, then it can be predicted that the heart rate will further decrease. The parasympathetic nervous system signals the body to relax and the heart rate slows down.
In the experiment, students performed a laboratory experiment where they noted that smelling lavender essential oil decreased the heart rate. They then proposed a reflex pathway that included the central nervous system activating the parasympathetic nervous system.
Now, if chamomile essential oil activated parasympathetic nervous system signaling more than lavender, then it can be predicted that the heart rate will further decrease. Chamomile essential oil can decrease the heart rate at a higher rate than lavender essential oil.
Therefore, chamomile essential oil would cause the body to relax and the heart rate would slow down even further. In conclusion, chamomile essential oil can activate parasympathetic nervous system signaling more than lavender and it can further decrease the heart rate.
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which characteristic must a signaling molecule have in order to bind to a cytosolic or nuclear receptor?
A signaling molecule should have particular features to be able to bind with a cytosolic or nuclear receptor. Cytosolic receptors and nuclear receptors are a class of intracellular proteins that aid in the transfer of information into the cell following binding with the signaling molecules.
The structure of the receptor is a significant characteristic that will determine which kind of signaling molecule can bind with it. The receptor protein is generally made up of a series of amino acids that provide a specific shape and chemical environment.
Binding of the signaling molecule with receptor leads to a conformational change in the receptor structure, which in turn leads to the activation of the signaling pathway or the initiation of gene expression. The interaction between the receptor and signaling molecule is largely driven by molecular recognition.
As a result, a significant characteristic that a signaling molecule should have is the ability to recognize the molecular structure of the receptor.
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what is mean by absorpstion
Ok, Im sorry but this drives me insane, so im only answering it because it drives me nuts.
Anyways.. Absorption is when something such as a towel or paper is absorbing or taking in the liquid that its on or near such as water or juice. Or how the dictionary has it, "the process or action by which one thing absorbs or is absorbed by another."
30. (06.05 mc) suppose a fungus destroys the central xylem and phloem tissues in the roots of a tree. what function of the root system will be lost because of this damage? (2 points)
The central xylem and phloem tissues in roots play a significant role in transporting water, nutrients, and sugars throughout the plant, respectively.
Xylem tissue is responsible for moving water and minerals from the roots to the rest of the plant, while phloem tissue transports sugars, amino acids, and other nutrients produced by the leaves throughout the plant.In a case where the central xylem and phloem tissues in the roots of a tree are destroyed by a fungus, the transport of water, minerals, and sugars would be hindered, leading to a loss of function of the root system. The plant would not be able to absorb essential nutrients and water from the soil effectively, leading to dehydration and malnutrition. This, in turn, could lead to a decrease in the rate of photosynthesis, growth, and reproduction.
Ultimately, the death of the plant would be inevitable if the damage is not corrected in time. The destruction of the central xylem and phloem tissues in roots by the fungus would have severe consequences on the plant's overall health and survival.
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all of the aspect of the nature of science can be demonstrated through inquiry in the science classroom. true false
The statement "all of the aspect of the nature of science can be demonstrated through inquiry in the science classroom" is True.
The aspects include concepts such as empiricism, objectivity, skepticism, creativity, and the use of evidence and logical reasoning. Inquiry-based learning in the science classroom provides an excellent opportunity to demonstrate and explore the nature of science. Through inquiry activities, students can engage in hands-on investigations, ask questions, make observations, collect and analyze data, form hypotheses, and draw conclusions. This process allows students to experience firsthand the key elements of scientific inquiry. Inquiry-based learning encourages students to think critically, evaluate evidence, and engage in problem-solving. It promotes active learning, collaboration, and the development of scientific skills such as observation, measurement, data interpretation, and communication. By engaging in scientific inquiry, students gain a deeper understanding of how science works and develop a more realistic view of the nature of science. Therefore, through inquiry in the science classroom, students can actively experience and demonstrate the various aspects of the nature of science.
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The statement that "all of the aspects of the nature of science can be demonstrated through inquiry in the science classroom" is true.
The nature of science refers to the philosophy of science that highlights the fundamental principles of scientific inquiry, such as objectivity, empirical evidence, testability, falsifiability, and repeatability, among others.
The inquiry is a central component of scientific learning that involves questioning, investigating, designing, conducting experiments, and analyzing data to construct knowledge and understanding of scientific phenomena.
In this sense, inquiry is a powerful tool that enables students to understand and experience the nature of science firsthand. Inquiry in the science classroom promotes scientific literacy and cultivates critical thinking skills that are essential in everyday life.
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What Earth measurement is greatest?
1. Polar Ciccumference
2. Equatorial Circumference
3. Equatorial Caround the equator) diameter
4. Polar (from north to south pole) diameter
Which statement summarizes a change that occurs during photosynthesis?
It converts visible light to high-energy gamma rays.
It converts carbon to oxygen.
It converts light energy to chemical energy.
It converts energy to mass.
Answer:
The answer to this question is C. It converts light energy to chemical energy.
Hope this helps!
Photosynthesis is the procedure that convert light energy into chemical energy. The correct option is C.
What is photosynthesis?The operation by which green plants as well as certain life forms convert light energy into chemical energy is known as photosynthesis.
Light energy is captured and is used by green plants during photosynthesis to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
Thus, the correct option is C.
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tntc - too numerous to count is when the number of colonies on a plate is greater than 300 group of answer choices true false
True or false: TNTC - too numerous to count is when the number of colonies on a plate is greater than 300?Answer: TrueWhen microbiologists work on microbial cultures, they analyze and evaluate them in different ways. The colony-forming units (CFU) are the most prevalent way to determine the number of bacteria in a sample.
Microbiologists grow bacterial samples on agar plates to separate and determine how many bacterial colonies they can create.Microbiologists use a Petri dish and appropriate culture media to culture microbial cells. A streak plate, a spread plate, or a pour plate is used to isolate and purify a colony of microorganisms.
Colony formation is caused by the multiplication of a single microbial cell. A single cell, called a colony-forming unit (CFU), produces one colony on a plate.Each of the colonies grown on the Petri dish contains millions of identical microbes. To determine how many bacteria are in the initial culture, microbiologists count the number of colonies. The CFU is the number of cells or bacteria in the initial culture, estimated by multiplying the number of colonies by the number of cells that form each colony.
When analyzing microbial cultures, if the colonies are so numerous that they cannot be counted, it is referred to as TNTC - too numerous to count. As a general rule, TNTC is defined as having more than 300 colonies on a plate. Thus, we can say that the given statement is true that TNTC - too numerous to count is when the number of colonies on a plate is greater than 300.
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true or false: people with fatal familial insomnia harbor the prion gene mutation in only the cells of the thalamus. (hint: its a genetic disease passed from generation to generation) group of answer choices true false
The statement "people with fatal familial insomnia harbor the prion gene mutation in only the cells of the thalamus" is false. Fatal familial insomnia (FFI) is a genetic disease that is passed down through generations. It is caused by a mutation in the PRNP gene that is located on chromosome 20.
The PRNP gene provides instructions for making a protein called prion protein (PrP), which is found mainly in the brain. The mutation results in the production of a misfolded prion protein that causes the death of nerve cells in the brain. This damage is particularly pronounced in a part of the brain called the thalamus.
The thalamus is responsible for regulating sleep, which is why insomnia is a hallmark symptom of FFI. However, the prion protein is found in other cells besides the cells of the thalamus. This includes cells in the spleen and lymph nodes, as well as other parts of the brain. The misfolded prion protein can accumulate in these cells and lead to the development of other forms of prion disease, such as Creutzfeldt-Jakob disease.
Therefore, it is not accurate to say that the prion gene mutation is only found in the cells of the thalamus.
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which species concept(s) will not work for asexual organisms?group of answer choicesbiologicalevolutionarymorphologicalphylogeneticrecognition
The biological species concept is one of the species concepts that will not work for asexual organisms. The concept is a way of defining species that is based on whether organisms can interbreed and produce viable offspring. According to this concept, members of the same species must be able to interbreed and produce viable offspring.
Asexual organisms, on the other hand, do not reproduce through sexual reproduction, and hence this concept will not apply to them. In asexual organisms, the species concept that can be applied is the morphological species concept. This concept defines species based on their physical characteristics.
It is most often used in the study of asexual organisms, because it is often difficult to study their reproductive systems. Other species concepts, such as the evolutionary species concept and the recognition species concept, may also be used to study asexual organisms.
However, the morphological species concept remains the most widely used for this group of organisms.
In conclusion, the biological species concept will not work for asexual organisms, and the morphological species concept is most commonly used for defining species in this group.
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(c)
The table below shows what four people ate for lunch.
name
lunch
Jon
chicken and salad
Nadia
cheeseburger and chips
lemonade and a jam doughnut
Clare
Zak
mushroom soup and an orange
(i)
Whose lunch had the most sugar in it?
I
(ii) Whose lunch had the most fat in it?
Answer:
lemonade and jam doughnut
the lymphatic vessel that collects lymph from the left chest, abdomen, and lower limbs is called the:
The lymphatic vessel that collects lymph from the left chest, abdomen, and lower limbs is called the thoracic duct.
The thoracic duct is the largest lymphatic vessel in the body and plays a crucial role in the lymphatic system. The thoracic duct begins in the abdomen, near the second lumbar vertebra, where it collects lymph from the intestinal lymphatic vessels called lacteals. It ascends through the thoracic cavity, alongside the aorta, and collects lymph from various organs and tissues along its course, including the left chest, left arm, left side of the head, neck, and upper thorax. Eventually, the thoracic duct drains into the left subclavian vein near the junction of the left internal jugular vein, returning the lymph back into the bloodstream. This junction is an important site where lymph from the thoracic duct combines with venous blood, allowing the transfer of immune cells and waste products from the lymphatic system to the circulatory system. The thoracic duct serves as a major pathway for the return of lymph and plays a crucial role in maintaining fluid balance, immune response, and nutrient absorption within the body.for more questions on thoracic
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The lymphatic vessel that collects lymph from the left chest, abdomen, and lower limbs is known as the thoracic duct. The thoracic duct is a significant lymphatic vessel in the body that collects lymph from the lower limbs, abdominal, and left side of the chest, and empties it into the bloodstream.
The lymphatic system is a network of vessels and tissues that are part of the immune system, responsible for transporting lymph fluids throughout the body. The thoracic duct is the largest lymphatic vessel in the body, about 40-45cm long, and starts from the level of T12 and ascends through the diaphragm into the chest cavity.
The duct runs parallel to the vertebral column and carries lymph fluid through the thorax and abdomen, draining into the junction of the left subclavian and internal jugular veins. The thoracic duct is responsible for returning excess fluid and protein to the bloodstream and absorbing fats and fat-soluble vitamins from the digestive system.
In conclusion, the thoracic duct is the primary lymphatic vessel that collects lymph from the left chest, abdomen, and lower limbs. It is responsible for returning excess fluid and protein to the bloodstream and plays an important role in maintaining fluid balance in the body.
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One sunflower pot is watered
with pure water and 3 others
are watered with increasing
concentrations of salt water.
The height of the sunflowers is
measured weekly.
What is the independent variable in this investigation?
Answer:
the concentrations of salt water because its being controlled by the scientists.
Explanation: the iv= between the control and expariment.
dv= data or out come
constant+ not changed at all
I'll give u a branliest if correct... nd don't just take the points
Which statement best describes a solid?
a. Definite Shape and very High Energy
b. Fixed Volume and Indefinite Shape
c. Indefinite Shape and Volume
d. Lower Energy and Fixed Shape
Answer:
A
Explanation:
its the one that makes more sense to me
Amebas are single-celled organisms that need to obtain food in order to (1) release oxygen into the air (2) protect themselves from other living things (3) get the energy they need to carry out life functions (4) remove harmful chemicals from the environment PLEASE HELP
Explanation:
i think they obtain food in order to get the energy they need to carry out life functions
Ameoba is single-celled organisms that need to obtain food in order to get the energy they need to carry out.
How does amoeba capture their food?Through the procedure of phagocytosis ( which means cell-eating), which is a type of endocytosis, an Amoeba obtains its food.
Its cell membrane is pliable enough, food particles are consumed forming a food vacuole encircling it which is helped by the pseudopodia.
It secretes digestive enzymes to bring about digestion of the swallowed particle once the food is tangled.
Thus, Ameoba is a single-celled organism that needs to obtain food in order to get the energy they need to carry out.
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