In order to prepare 1 mL 80 mg/mL, 1 mL 60 mg/mL, 1 mL 40 mg/mL, and 1 mL 20 mg/mL glucose solution from a 100 mg/mL stock solution, 0.8 mL, 0.6 mL, 0.4 mL, and 0.2 mL of the stock will be taking and diluted with 0.2 mL, 0.4 mL, 0.6 mL, and 0.8 mL water resectively.
DilutionThe dilution principle states that the number of moles of solute in the original stock before dilution must be equal to the number of moles of solute in the diluted stock.
This principle is mathematically expressed as: m1v1 = m2v2
Where: m1 and v1 = molarity and volume before dilution
m2 and v2 = molarity and volume after dilution.
In this case, the stock is 100 mg/ml.
To prepare 1 ml, 80 mg/mL solution: m1 = 100 mg/mL, v2 = 1 mL, and m2 = 80 mg/mL.v1 = v2m2/m1
= 1x80/100
= 0.8 mL
This means that 0.8 mL of the stock will be taken and diluted with 0.2 mL of water to make 1 mL, 80 mg/mL solution.
To prepare 60 mg/mL solution:v1 = 1 x 60/100
= 0.6 mL
This means that 0.6 mL of the stock will be taken and diluted with 0.4 mL of water to make 1 mL, 60 mg/mL solution.
To prepare 40 mg/mL solution:v1 = 1 x 40/100
= 0.4 mL
This means that 0.4 mL of the stock will be taken and diluted with 0.6 mL of water to make 1 mL, 40 mg/mL solution.
To prepare 20 mg/mL solution:v1 = 1 x 20/100
= 0.2 mL
This means that 0.2 mL of the stock will be taken and diluted with 0.8 mL of water to make 1 mL, 20 mg/mL solution.
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What is habitat fragmentation?
A. when a habitat gets divided
B. when a habitat loses organisms
C. when a habitat is completely destroyed
When portions of a habitat are destroyed, smaller, disconnected areas are left behind, leading to fragmentation.
What is meant by habitat fragmentation?Habitat fragmentation is the process by which a large area of habitat is divided into several smaller patches with smaller total areas that are isolated from one another by a matrix of habitats that is different from the original.
When portions of a habitat are destroyed, smaller, disconnected areas are left behind, leading to fragmentation. Although fire or volcanic eruptions can cause this naturally, human activity is typically to blame.
The process by which a natural landscape is divided into discrete ecosystems that are separate from one another and are dominated by human activity.
Therefore, the correct answer is option C. when a habitat is completely destroyed.
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Describe external structure of heart
Answer:
The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane.
Answer:
heart is enclosed .in sack like structure
Open and closed systems are complete opposites of one another. All of the following are examples of open systems EXCEPT which
one?
O A pressure cooker
O A pot of pasta boiling on the stove with no lid
O A human being breathing in oxygen and exhaling carbon dioxide
O A fresh cup of hot coffee with no lid
The system that is not an example of an open system is the pressure cooker.
What is an open system?Let us recall that both the open and the closed systems are the types of thermodynamic systems that we have. In effect, we could say that there are actually about two kinds of thermodynamic systems and these are the open system and the closed system. The open system is the system min which there is an exchange of materials and energy with the external environment while in the closed system, there is no exchange of material and energy with the external environment.
Having said this, whet we now have to look out for is the system where we do not have an exchange of material and energy. That sort of system does not qualify as an open system.
As such, the pressure cooker is a closed and not an open system.
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do you think that the incubation period of all the animal is same? why?
Answer:
no
Explanation:
incubation varies for different species.
Oscar has never been to a formal dance before. He asks his friend Jerome what to expect. Jerome tells Oscar what to expect using images and explanations for how to gain admittance to the dance. What BEST describes what Jerome is using in his description?
A.
analogical reasoning
B.
inductive reasoning
C.
mental image
D.
mental model
Jerome is using this in his description of analogical reasoning.
Analogical thinking is any kind of thinking based on analogy. An analogy is an explicit statement in the form of an analogy that invokes the accepted similarities between two systems to support the conclusion that another similarity exists. Analogical thinking is thinking based on finding a common system of relationships between two situations instances or domains.
Once such a common system is found what is known about one situation can be used to derive new information about another situation. A mental model is a description of a person's thought process for how something works in the real world. It describes a person's intuitive perception of the world around him, the relationships between its various parts, and his actions and their consequences.
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Think of a place on Earth where you would like to live or visit some day. Write down a description of the climate there and the various factors you think might influence that climate. Think about the reasons why you chose those particular factors as important contributors to the climate.
The presence of methane or carbon dioxide in the air is associated with climate because they function as greenhouse gases that trap heat from solar radiation into the atmosphere.
What are greenhouse gases?Greenhouse gases such as carbon dioxide or methane are able to alter the global climate because they do not allow the dispersion of heat from solar radiation into space, thereby increasing global temperatures.
Therefore, we can conclude that greenhouse gases (e.g., carbon dioxide or methane) may alter the global temperature and therefore the concentration levels of these substances in the atmosphere are indicative of climate conditions.
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What BEST describes the roles of photosystem I and photosystem II in the process of photosynthesis?
OA. They form ATP as hydrogen ions cross the thylakoid membrane.
OB. They absorb sunlight and distribute the energy as heat.
OC. They transfer electrons from a series of intermediates to form NADPH.
O D. They absorb sunlight and transfer the energy to electrons.
The statement they absorb sunlight and transfer the energy to electrons BEST describes the roles of photosystem I and photosystem II in the process of photosynthesis (Option D).
What are photosystem I and photosystem II?Photosystem I and photosystem II are macromolecular complexes used during the process of photosynthesis which are able to transport electrons in order to couple this movement to the generation of ATP.
Therefore, we can conclude that photosystem I and photosystem II are protein complexes that plant cells use to produce energy by using electron transference transport.
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Provide information on the weather and climate of your biome Taiga
Give five abiotic factors and five biotic factors in your Taiga
Provide an example of how an abiotic factor affects a biotic factor in your biome.
Provide a food web for your biome starting with the Earth’s primary source of energy.
Provide examples of how humans are affecting your biome Taiga
Provide a conclusion of the ways humans can help protect your biome Taiga
The taiga is an important biome for the earth because there are many valuable species and clear waters there.
What is a Taiga?The taiga is a biome that is characterized by having coniferous forests, being one of the largest forest masses on the planet.
How is the weather and climate in the Taiga?The weather and climate of the taiga are characterized by being cold during most of the year, with temperatures ranging from 19°C to .30°C. Despite being cold, the rain pattern is not abundant because it averages 450mm.
What biotic and abiotic factors are there in the taiga?The biotic factors of the taiga are:
Fish, birds, mammals, humans and plants.The abiotic factors of the taiga are:
Rocks, water, snow, ice, winds, acid soil.How does an abiotic factor affect a biotic factor in the taiga?The abiotic factor that affects all the biotic factors of the taiga is water, since it is a necessary resource for the life of these organisms.
Taiga food web exampleIn the taiga everything begins with the ground, where plants and grass grow, this grass is used to feed some mammals such as reindeer and deer; these deer serve as food for other predators such as pumas, finally these pumas die and their remains become nutrients for the soil.
What effects is the human causing to the Taiga?The human relationship with the taiga dates back to prehistory. However, during the last time it has caused a negative impact because it has contaminated the crystal clear water that is there. Additionally, the felling of trees has been exceeded, which has affected other species that live there.
How can humans take care of the Taiga?Humans can take care of the taiga by implementing good sustainable practices with the environment. Avoid cutting down trees and not polluting the water.
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Which of the following would be a characteristic of a cell
produced by mitosis?
Daughter cells that are genetically identical to their parent cells are created during mitosis. The cell equally divides its copies of its chromosomes to give each daughter cell a full set before copying, or "replicating," them.
What traits do cells created during mitosis possess?Daughter cells that are genetically identical to their parent cells are created during mitosis. The cell equally divides its copies of its chromosomes to give each daughter cell a full set before copying, or "replicating," them.
What types of cells are capable of undergoing mitosis to produce them?A cell divides into two identical copies during the process of mitosis, each of which has the same number of chromosomes. Four gametes are produced during the meiotic division of a cell. Male gametes are more frequently referred to as sperm, and female gametes as eggs.
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12. The pairing of purines with pyrimidines to create a double-stranded DNA molecule is called What?
Base pairing is the process of combining purines and pyrimidines to form a double-stranded DNA molecule.
Meaning of base pairing:Pay attention to how it sounds. (Payers Bays) On the two opposing strands of both the DNA double helix are molecules called nucleotides that interact chemically. These chemical connections, which act as rungs on a ladder, hold the two DNA strands together.
What types of bases pair with pyrimidines?The two main pyrimidine bases found in DNA are cytosine and thymine, which base pair (see Watson-Crick Pairing) with guanine as well as adenine (see Purine Bases) correspondingly. Thymine is swapped out for uracil and base pairs are switched to adenine in RNA.
Why do bases pair?Between the nucleon-bases of the respective nucleotides, hydrogen bonds are created to establish base pairing. Bi and Bj must be in the interaction range for hydrogen bonding to form.
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Over hunting of a species by humans can cause evolution to occur due to
natural selection
mutation
founder effect
Immigration
bottle neck effect
Over hunting of a species by humans can cause evolution to occur due to option E: bottle neck effect.
What is the bottleneck effect in regards to biology?The bottleneck effect is known to be a term that describes how a population's size is first decreased as well as then increased and how this changes how genetic variation is distributed among its members.
Note that When a population is drastically reduced in number, genetic drift is said to manifests itself most dramatically in a phenomenon known as the bottleneck effect.
Hence, Natural disasters (earthquakes, floods, as well as fires) can completely devastate a population, killing the majority of species and leaving only a few, haphazard survivors in their wake.
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four effects of muscle contraction.
Answer:Isometric: A muscular contraction in which the length of the muscle does not change. isotonic: A muscular contraction in which the length of the muscle changes. eccentric: An isotonic contraction where the muscle lengthens. concentric: An isotonic contraction where the muscle shortens
Explanation:
HELP ASAP PLEASE
Maria has started a new diet that consist of consuming many fruits and vegetables each day. She is at your office to make sure that this new diet will aid in her goal of losing 10-20 lbs.
As a doctor. you will need to describe to Maria how a food molecule travels through the cell. Create a response to Maria that explains how a food molecule will pass through different organelles on its way to being hydrolyzed and converted into usable energy.
* You must use at least 4 organelles in your explanation to Maria.
The four organelles through which the food molecule is hydrolyzed and converted into usable energy are Nucleus, cytoplasm, mitochondria , Ribosomes.
Cellular respiration
The process of converting glucose into a form of energy (ATP) that is useable by cells.The organelles involved in it are:
1. Nucleus
The nucleus, a substantial organelle that houses the cell's DNA (deoxyribonucleic acid), is referred to as the "command center" of the cell . All of the cell's functions, including growth and metabolism, are controlled by the nucleus. Thus, it commands cell to uptake the glucose.
2. Cytoplasm
The glucose when comes in cytoplasm undergoes glycolysis to form 2 molecules of pyruvate.
3. Ribosomes
These are protein forming substances and help in cell metabolism.
4. Mitochondria
The 2 molecules of pyruvate then goes inside the mitochondria to undergo TCA (Tricarboxylic acid cycle) which ultimately lead to the formation of ATP.
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Match the following structures and functions to the prokaryotes, please.
According to the options displayed, the answers are:
cytoplasm --> water based, jelly like substance within the cell.
nucleoid region --> contains the DNA
cell wall --> maintains shape
capsule --> surrounds cell wall and protects
flagella --> locomotion
pili --> hair like structures for DNA exchange
cell membrane --> primary barrier
What’s the correct answer answer asap for brainlist
Answer:
Axial skeleton and appendicular skeleton
Explanation:
The Axial forms the vertical, central axis of the body and includes all of the head, neck, chest, and back bones. The appendicular system includes all of the lower and upper limb bones plus the attaching bones to the Axial skeleton.
Hope this helps! :)
What’s the correct answer answer asap for brainlist
Answer:
B is your answer of all time
Locate and Label the plasma membrane, cell wall, and middle lamella.
The given diagram is labelled with the plasma membrane, cell wall, and middle lamella.
Plasma Membrane- All cells have a cell membrane, also known as a plasma membrane, which divides the inside of the cell from of the external environment. A semipermeable lipid bilayer makes up the cell membrane. The movement of materials into and out of the cell is controlled by the cell membrane.
Cell Wall- Every plant cell is encased in a particular type of extracellular matrix. Many of the traits that set plant cells apart from animal cells are caused by the cell wall.
Middle Lamella- The portion of the cell wall that makes up the middle lamella is indeed the top layer separating cells. It contains a lot of pectin, which binds the main cell walls of nearby cells. It creates stability and plasmodesmata (connections between cells).
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What’s the correct answer answer asap
Answer:
B
Explanation:
skeletal muscles could get weary or sore if subjected under too much movements.
30 points define in your own words biology
Answer:
Explanation:
Capillary action: movement of water or any liquid through its system by compression, (gravity, towards or away) through the system.
Polar molecule: when a molecule has two opposite charges(positive and negative
Ionic bond :when a chemical compound has electrostatic attraction due to the charged particles within
Covalent bond: when an electron pair is shared between the two atoms
Hydrogen bond considered a weak bond between two molecules, a proton in one molecule and an electro negative atom Adhesion
Cohesion: attraction of molecules of similar kind towards each other.
Adhesion: attraction of molecules of different kind towards each other.
Why did we use percentages to make predictions rather than actual measurements? Use the word 'scale' in your answer.
Because projections might be erroneous, a percentage value is used rather than an actual measurement. The number is taken per 100 people or can be scaled as a percentage.
Because it is a forecast, real measurements cannot be utilised. Because there is no accurate data, only an estimate may be employed.
Why is it crucial to calculate the % difference?% difference is used to determine how much two measurements of the same amount taken independently differ from one another. When comparing a single measurement of a quantity to its theoretical or "currently accepted" value, for instance, the percentage error is employed.
When you measure anything in an experiment, your percent mistakes let you know how significant your errors are. A 1% inaccuracy, for instance, indicates that you were pretty near to the approved number, but a 45% error indicates that you were rather far from the genuine value.
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What are two main things that are unique to the Troposphere?
Question 4 options:
people live in this layer and the weather occurs here
meteors burn up and it's the coldest layer
the International Space Station Orbits in this layer and it has the highest temperatures
none of the above
The troposphere gets some of its heat directly from the Sun which comes from the surface of Earth.
What are the characteristics of the Troposphere?Because the troposphere contains about 85% of the atmosphere's total mass. the troposphere has the elevated density, greatest air pressure, 75% of the atmospheric mass, almost all water vapor, and a temperature range from 62 to -60 degrees F. The temperature in the troposphere decreases continuously with altitude. The stratosphere is very dry air and contains little water vapor. Because of this, few clouds are found in this layer and almost all clouds arise in the lower, more humid troposphere. Polar stratospheric clouds (PSCs) are the exception. PSCs take shape in the lower stratosphere close to the poles in winter.
So we can conclude that some of the heat directly from the Sun gets first by the troposphere.
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What do plant and animal cells have in common?
O plasma membrane, large vacuole
O nucleus, mitochondria
O cell wall, cytoplasm
O cell wall, mitochondrion
PLEASE HELP
Explanation:
nucleus and mitochondria
cell walls are only in plant cells
large vacuole is only in plant cells
(animal cells do have a vacuole but just not a large one)
Answer: Nucleus and Mitochondria
Explanation: A Is wrong because both animal and plant cells have a plasma membrane, but only plant cells have a large vacuole.
C and D is wrong because plant cells only have a cell wall not animal cells.
So B- Nucleus and Mitochondria is your answer!
Hope that makes sense! Have a good day!
What is the COMPOUND PREDICATE in the following sentence? Jeanne had to measure the flour, pour the sugar, and roll the dough. A. Jeanne B. measure, pour, and roll C. roll the dough D. measure the flour
HELP! ITZ URGENT
Answer:
I believe that it is B
Explanation:
compound predicate Definition - occurs when two or more verbs appear in a single sentence and share the same subject.
B) shares 3 verbs in a single sentence.
Which of the following is a sustainable method of human societal development?
A. Limiting unnecessary resource use
B. Using only nonrenewable resources
C. Degrading resources with pollution
D. Encouraging a throwaway culture
Answer:
D. Encouraging a throwaway culture. The other options approve against this action, which is bad for the earth.
Explanation:
Hope it helps! =D
Question is in the image provided
Answer:
C & A
Explanation:
In the lack of oxygen, cells die by apoptosis rather than necrosis. Apoptotic signaling occurs during oxygen deprivation via the cytochrome c release and the activation of caspase-9 by apaf-1.
What is a difference between endocrine and exocrine glands?
• A. Endocrine glands secrete products into ducts and exocrine glands secrete hormones into the bloodstream.
O B.
Endocrine glands secrete hormones into the bloodstream and exocrine glands secrete products into ducts,
• C. Endocrine glands produce nutrients for cells and exocrine glands absorb minerals for cells.
O D. Endocrine glands absorb minerals for cells and exocrine glands produce nutrients for cells.
Answer:
B.
Explanation:
Endocrine glands release hormones into the bloodstream, while exocrine glands release substances through ducts onto your body surfaces, making B the correct answer.
.Why deontology still important in contemporary healthcare practice?
Deontological values, such as treating patients as ends in themselves, can help to eliminate potential maleficence while increasing beneficence, justice, and autonomy.
What is deontology?Deontology is an approach to ethics that uses regulations to distinguish between what is right and what is wrong.
Immanuel Kant is frequently associated with deontology. Kant held that ethical actions must adhere to universal moral laws.
Deontologists place a premium on three major decision-making principles: intrinsic morality, the duty of care, and the moral consequences of an action.
In deontological ethics, an action is morally good because of some aspect of the action itself, rather than because the result of the action is good.
According to deontological ethics, some acts are morally obligatory regardless of their consequences for human welfare.
Thus, deontology still important in contemporary healthcare practice.
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what abiotic and biotic factors describe a biome
Biome is described as a large community of flora and fauna occupying major habitat . That consists of abiotic and biotic factors.
Biotic factors are living things within an ecosystem mainly plants animal and microorganisms . A biotic factor comprises of living organism that shapes its environment. In a freshwater ecosystem, examples might include aquatic plants, fish, amphibians, and algae. While Abiotic factors are non living components that mainly consists of water soil and atmosphere .Abiotic factors that help characterize a biome include climate, temperature, humidity, soil type and amount of sunlight and the quantity of water that is available in the ecosystem .
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If a population consists of mainly older individuals, how would you expect the future population size to respond?
If a population consists of mainly older individuals, the future population size will go to decline as the no new young individual are available to reproduce.
Population- A population is defined as the quantity of identical species of organisms that are present in a given location at the same time and have the potential to interbreed. Individuals need to be capable of mating with any other people in the population and have fruitful children for interbreeding to happen.
Species- A collection of creatures that can naturally reproduce with each other and generate viable progeny is sometimes referred to as a species.
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The Nutrition Facts panel must provide the ____________________ for important nutrients.
a. percent daily value
b. tolerable upper limit
c. structure–function claims
d. nutrient claim
e. average daily intake
Answer:
Explanation:
The Nutrition Facts panel must provide the percent daily value for important nutrients.
The Nutrition Facts panel must provide the percent daily value for important nutrients, hence option A is correct.
Total fat, trans fat, saturated fat, cholesterol, salt, total carbohydrate, dietary fiber, total sugars, added sugars, protein, and sure vitamins and minerals must all be listed on the Nutrition Facts label.
The facts' panel gives all the necessary details about a product, including serving sizes, servings per container, and the names and amounts of the nutritional components.
The %DV on the nutrition label indicates how much a nutrient in a serving of food contributes to the daily total.
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