A normal breath takes in about 1.0 L of air. If air has an average molar mass of 28.8 g per 1 mol and has a density of 0.97 g/mL, how many molecules of air do you take in with each breath
Taking into account the definition of density and Avogadro's Number, you take 2.0286×10²⁵ molecules of air.
What is densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
What is Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Amount of molecules of airIn this case, you know that:
Density= 0.97 [tex]\frac{g}{mL}[/tex]Volume= 1 L= 1000 mLReplacing in the definition of density:
[tex]0.97 \frac{g}{mL}=\frac{mass}{1000 mL}[/tex]
Solving:
mass= 0.97 [tex]\frac{g}{mL}[/tex] ×1000 mL
mass= 970 g
Air has an average molar mass of 28.8 g per 1 mol. Then 970 grams are contained in 33.68 moles.
Now, considering the definition of Avogadro's number you can apply the following rule of three: If 1 mole of air contains 6.023×10²³ molecules, 33.68 moles contains how many molecules?
amount of molecules = (33.68 moles× 6.023×10²³ molecules)÷ 1 mole
amount of molecules= 2.0286×10²⁵ molecules
Finally, you take 2.0286×10²⁵ molecules of air.
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An owl,
grasshopper, grass plant, and shrew are all part of the same food chain.
1. Describe what a food chain represents.
2. What would be the order of these organisms in a food chain?
3. Which organism is the producer? Explain.
4. Which organism is a tertiary consumer? Explain.
Number your answers in your response below.
The food chain represents the linear sequence of organisms through which nutrients and energy gets transferred from one trophic level of the organism to another.
What is the Trophic level?In a food chain, the trophic level may be characterized as the hierarchical series that is illustrated by organisms that are the exact number of steps extracted from the primary producers.
The order of the food chain is:
Grass plants → Grasshopper → Shrew → Owl.
The grass plant is a producer in this food chain, a grasshopper is a herbivore (primary consumer), the shrew is a carnivore (secondary consumer), and an owl is an omnivore (tertiary consumer).
Therefore, it is well described above.
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Which characteristic is used to measure the amount of light radiated by a star?
size
color
luminosity
temperature
Validity of an experiment is based upon:
A. Using a control group.
B. Performing a fair test in which only the independent variable affects the dependent variable.
OC. Using multiple independent variables.
D. Performing a fair test, in which only the dependent variable affects the independent variable.
A
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Answer:
performing a fair test, in which only the dependent variable affects the independent variable
The sympathetic nervous system a. is always excitatory for smooth muscle b. innervates only tissues concerned with protecting the body against challenges from the outside environment c. dominates in rest-and-digest situations d. contains cholinergic and adrenergic fibers e. a and d
The sympathetic nervous system innervates only tissues concerned with protecting the body against challenges from the outside environment.
What is the importance of sympathetic nervous system?The sympathetic nervous system orders the body to quick involuntary response to stressful situations. A specific hormones boosts the body's alertness and heart rate in order to send extra blood to the muscles.
So we can conclude that the sympathetic nervous system innervates only tissues concerned with protecting the body against challenges from the outside environment.
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glomerular capillaries and podocytes together form the:
According to the research, glomerular capillaries and podocytes together form the filtration membrane.
What is the filtration membrane?It is the filtration barrier of the renal corpuscle that consists of the endothelium of the glomerular capillaries, the podocytes, and prevents the passage of macromolecules mechanically and electrically.
Podocytes also keep the glomerular filtration barrier stable by removing proteins and immunoglobulins.
Therefore, we can conclude that according to the research, glomerular capillaries and podocytes together form the filtration membrane.
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What are some land adaptations of vertebrates?
The vertebrates that first invaded the land possessed a series of pre-adaptations, such as air-breathing and limb-based locomotion, that allowed them to move about effectively on land; however, other behaviors such as reproduction and swallowing likely tied these vertebrates to the water
When moving to land, animals faced several changes to adapt to the new environment, like lung and limbs development, tegumentary cover, and internal fertilization.
Which are the adaptations of vertebrates to land habits?
Any change to a new environment needs adaptations.
Aquatic animals had to face many changes in their morphology and physiology when changing to terrestrial habits. Some of them are,
Lung developmentThe most significant change is probably lung development, needed to produce gas interchange between tissues and the air.
Once on the ground, animals need to interchange oxygen and carbon dioxide with air. They managed to do so through the respiration process in which the circulatory and respiratory systems work together.
Tegumentary coverAnimals needed to develop a new thicker and harder tegumentary cover.
It needed to be more resistant, especially to avoid or reduce dehydration.
Also, the tegument provides protection when facing new environmental pressures -predation among them-.
Limbs developmentAnother significant change was limb development, which was obviously needed to move on the ground.
Locomotion on the ground required a new pattern of bone arrangement and many muscle changes.
The muscular system suffered many modifications because animals needed to move facing gravity pressure.
Internal fertilizationAnimals needed to face another change related to their reproductive system.
They could no longer make use of external fertilization, as they used to do in aquatic environments.
They developed reproductive organs needed to insert sperm cells into the female body and fertilize the egg cells inside the females.
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meat, fruits, and vegetables could be contaminated withe. colistrains toxic to humans when they come in contact with animal ____
Meat, fruits, and vegetables could be contaminated withe. colistrains toxic to humans when they come in contact with animal feces, urine and blood.
What is contamination?Contamination us the process in which food materials, water or pure substances become impure or infected when it come in contact with impurities or microorganisms waste products.
Therefore, Meat, fruits, and vegetables could be contaminated withe. colistrains toxic to humans when they come in contact with animal feces, urine and blood.
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The method of _______ is used for tests of hypotheses that three or more population means are equal.
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● The method of " one-way analysis of variance " is used for tests of hypotheses that three or more population means are equal.
Answer:
one-way analysis of variance
Explanation:
An experiment consists of drawing two balls out of an urn with replacement. The urn has 1 red ball, 1 white ball, and 1 blue ball. How many possible outcomes have one white ball?
cells were first discovered when a scientist named _____________ observed cell walls in cork under a microscope
The cells were first discovered when a scientist named Robert Hooke observed cell walls in cork under a microscope.
Who was Robert Hooke and what was his importance for cytology?Robert Hooke's observation made it possible to visualize the dead cell walls of cork, even without knowing what the image represented, exactly, and without relating living beings to a cellular composition.
In the beginning, the cell theory was elaborated by the scientist Robert Hooke, in the year 1665. Based on this research, the cell is a morphophysiological unit of all living beings, that is, it corresponds to the smallest unit of life.
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Which of the following is NOT true of viruses?
A. Some viruses have a membrane envelope.
B. Viruses need a living cell to reproduce.
C. Some viruses live through the lytic cycle.
D. Some viruses contain both DNA and RNA.
Some viruses contain both DNA and RNA as their genetic material is NOT true of viruses (option D).
What is a virus?A virus is a non-living entity that needs a suitable host to reproduce its genetic material (DNA or RNA).
Viruses may contain a genetic material composed of other DNA or RNA but not both.
In conclusion, some viruses contain both DNA and RNA as their genetic material is NOT true of viruses (option D).
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Suppose an mRNA consists of 60 nucleotides; it directs a primary polypeptide chain containing __________ amino acids to be synthesized.A)18B)30C)10
Answer:18
Explanation: gilr i got grade results too
Increasing substrate concentration restores enzyme activity that has been blocked by:.
Answer:
a conpatitive inhibitor only
Which statement about generic disease is true
A
B
C
Answer:
B. Genetic diseases are CURABLE but not TREATABLE.
A scientist shines ultraviolet light on a colony of blue colored bacteria. She then places colonies of the bacteria in separate Petri dishes. After
allowing the bacteria to replicate for several generations, the scientist observes that some of the dishes now contain colonies with purple and
red colored bacteria. What can be concluded from this observation?
on area is 10m * 10m and 6 quadrants of 0.5 * 0.5m where set randomly and counted six five four three two and one grass respectively how many grasses would be found in the whole area
Identify the correct statement(s) regarding heritability Heritability is always calculated by a correlation between parental (mid-parent) and offspring traits If heritability is equal to 1, offspring mean is equal to the mean of the original population When heritability is equal to 1, response to selection is equal to selection differential All of the above are correct
The correct statement regarding heritability is D. All of the above are correct.
What is heritability?Heritability simply means a measure of how well differences in the genes of people account for the difference in their traits.
In this case, a the options given regarding heritability are correct.
Therefore, the correct option is D.
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A nursing instructor is reviewing the role and function of stem cells in the bone marrow with a group of nursing students. After providing the explanation, the instructor asks the students to use their knowledge of anatomy and physiology to determine an alternate way in which adults with diseases that destroy marrow can resume production of blood cells. Which explanation by the students is correct
Bone marrow transplant is the alternate way that destroy marrow can resume production of blood cells.
Determine an alternate way for destroy marrow?A bone marrow transplant, is the treatment and an alternate way that destroy marrow can resume production of blood cells. If a donor is found, your diseased bone marrow is depleted with radiation or chemotherapy and the new bone marrow is transplanted.
So we can conclude that bone marrow transplant is the alternate way that destroy marrow can resume production of blood cells.
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I need the answer asap
Answer:
Executive
Explanation:
having the power to put plans, actions, or laws into effect.
How does a motor neuron work when a mosquito is seen on an arm? it receives stimuli information from the skin and sends it to the brain where it is processed. it receives processed information from the brain, causing the muscles of the arm and hands to remove the mosquito from the arm. it processes information from the stimuli receiver and makes the brain aware that there is a mosquito on the arm. it makes the arm numb from the effect of the mosquito bite.
The motor neuron work when a mosquito is seen on an arm as it receives processed information from the brain, causing the muscles of the arm and hands to remove the mosquito from the arm. The correct option is B.
What is a motor neuron?Motor neurons are a type of brain cell that can be found in both the spinal cord and the brain.
The motor neuron work when a mosquito is seen on an arm as it receives processed information from the brain, causing the muscles of the arm and hands to remove the mosquito from the arm.
Thus, the correct option is B.
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Answer:
b is correct
Explanation:
The size of most prokaryotic cells is about _________ in diameter.
1-2µm
3-4µm
4-5µm
2-5µm
Answer:
option 1
Explanation:
The size of most prokaryotic cells is about in diameter.
1-2µm
The size of most prokaryotic cells is about 1-2µm in diameter. Therefore option A is correct.
Most prokaryotic cells are relatively small, typically ranging in diameter from 1 to 2 micrometers (µm). Prokaryotes are unicellular organisms without a true nucleus or membrane-bound organelles.
Their small size is advantageous as it allows for efficient nutrient uptake and waste elimination, facilitating rapid growth and replication.
Despite their small size, prokaryotic cells are highly diverse and can be found in various environments, including soil, water, and even within the human body.
Therefore option A is correct.
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Which type of scientific statement is defined as "a possible explanation or answer to a scientific question that is based on
prior knowledge or research and is testable"?
hypothesis
O theory
O law
O probability
There are six people in the Fisher family. Olivia and Marcus are the parents. They have four children: Violet, Nathan, Jonas, and Claudia.
Neither Olivia nor Marcus have freckles.
What is Olivia's genotype?
What is Marcus' genotype?
What is the probability that each child has of inheriting freckles?
Both Marcus and Olivia are heterozygous for the hairline trait.
What is the probability that each of their children could inherit a widow's peak?
What is the probability that each of their children could inherit a straight hairline?
What is the probability that each of their children could be homozygous dominant for the trait?
Neither Marcus nor Olivia can roll their tongues.
How many of their children could be born with the ability to roll their tongues?
How many of their children could be heterozygous?
What is the genotype of the whole family?
All four children have dimples.
What is likely the genotypes of their parents?
Do we know with certainty that one of the parents has to have dimples?
Both Olivia and Marcus are EE for the earlobe trait.
Among their children, what is the ratio of free earlobes to attached earlobes?
What percentage of the children are homozygous?
Marcus can not detect the bitter taste. Olivia has been found to be able to detect the bitter taste, but she is heterozygous for the trait.
What is the probability that each of their children could taste the ptc paper?
If Violet can not taste the ptc paper, what is Violet's genotype?
Given what you know, how many of the family can taste the ptc paper?
1.
Freckles are caused by a dominant allele (F).
Marcus and Olivia have recessive homozygotes for the characteristic, ff, if neither of them has freckles.
Olivia's genotype is thus ff.
Marcus has a ff genotype.
Given that they are both recessive homozygotes for the ff gene, there is little chance that their offspring will have freckles.
2.
The straight hairline allele, W is recessive to the widow peak allele, W.
Marcus and Olivia share the hairline trait heterozygosity Ww.
The likelihood of a widow having children is highest when:
Ww = Ww, Ww, Ww, and ww
Widow's peak probability (WW or Ww) equals 3/4
The likelihood that a youngster will have a straight hairline is 1/4.
The likelihood that the offspring will be homozygous
3.
The attached-lobule trait, e, is recessive to the free-lobule trait, E.
The trait, EE, is homozygous dominant in both parents.
One to zero is the ratio of free to connected lobes.
The offspring will be homozygous dominant free lobules, EE, in all cases.
4.
The ability to taste bitter flavors is dominant (T).
Marcus is a recessive homozygote for the trait "tt" since he cannot sense bitterness.
Olivia possesses a "Tt" heterozygote for the trait.
Tt tt equals Tt, Tt, tt, and tt.
There is a 50% chance that each of their kids will try the PTC paper.
Violet's genotype is tt since she cannot taste PTC paper.
5.
T, tongue rolling is a dominant characteristic.
Marcus and Olivia both have tt genotypes since neither of them can roll their tongues.
tt = tt = tt = tt
Therefore;
Their offspring won't be able to roll their tongues.
No hybrids will be born to them.
The entire family shares the genetic tt.
6.
A dimple is a dominant trait (D)
The four youngsters all have dimples.
Therefore,
It's possible that both of their parents carry the dominant allele for the characteristic "DD" or
One of them is heterozygous, or "Dd," and the other is homozygous.
The dominant h0m0zygote "DD" is one of them, while the recessive h0m0zygote "dd" is the other.
Therefore, at least one parent must have a dimple.
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High population densities in urban areas have advantages and disadvantages. List as many of each as you can and defend your conclusion. How could the disadvantages be eliminated or reduced? Use evidence to support your conclusion.
Answer:
A larger population density will help reduce the average costs of the transport network. Areas of high population density have not seen the food shortages because of improved yields from agriculture and the ability to trade food. Economic growth will be comparatively more than low density area.
What do excitatory neurotransmitters cause ?
Exitatory neurotrasmitter excite the postsynaptic memebrane by increasing the action potential effects. They allow the messages passage from one cell to the other.
What do excitatory neurotransmitters cause?
Neurotransmitters might be either excitatory or inhibitory.
As the term suggests, excitatory neurotransmitters are in charge of exciting the postsynaptic cell.
Once the neurotransmitter is released from the presynaptic membrane, it travels through the synaptic space until it reaches the postsynaptic membrane.
When the molecule meets its receptor, it triggers a series of events that excite the receiving neuron increasing the action potential effects and allowing messages to be passed from one cell to the other.
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Why did problems with low oxygen levels and increasing carbon dioxide levels develop in Biosphere?
The problem with low oxygen levels and increasing carbon dioxide levels develop in the Biosphere because the oxygen was absorbed by the population of microbes that are growing in an uncontrolled manner and some other concrete structures present in the Biosphere.
What is Biosphere?A biosphere may be defined as the areas of the surface and atmosphere of the earth or another planet inhabited by living organisms. It may also be regarded as the zone of life on earth.
The amount of carbon dioxide directly depends on the amount of oxygen. If the oxygen level reduces, the level of carbon dioxide will definitely tend to increase.
The level of oxygen accounted as low in the biosphere due to the microbial respiration to a larger extent. And thereby, the level of carbon dioxide increases.
Therefore, it is well described above.
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the term __________ refer to a membrane that allows some things to pass through it, but not others
The term selectively permeable refers to a membrane that allows some things to pass through it, but not others.
What is the cell membrane?The cell membrane is a selectively permeable barrier that allows the entry of certain substances into the cell.
Selectivity of the cell membrane is fundamental to maintaining the homeostasis (state of internal equilibrium) of the cell in a surrounding environment.
In conclusion, the term selectively permeable refers to a membrane that allows some things to pass through it, but not others.
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Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called:.
Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called microvilli.
What is microscopic folds?Microscopic folds are those fold that are found above an epithelial cell of an organ where maximum absorption takes place.
These microscopic folds have increased surface areas and a typical example is the microvilli of the small intestine.
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Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called Microvilli.
What is Microvilli?Microvilli are cellular membrane protrusions that improve diffusion surface area while minimizing volume increase than can be seen through a microscope. Plasma membrane covers microvilli, enclosing cytoplasm and microfilaments (the main structure is given by the actin filaments).
In the gastrointestinal system, microvilli serve as the major surface for nutrition absorption. The microvillar membrane is filled with enzymes that help in the breakdown of complicated nutrients into simpler molecules that are more easily absorbed because of its critical role.
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The world's largest ocean is the
a. Indian Ocean
b. Arctic Ocean
C. Atlantic Ocean
d. Pacific Ocean.
[tex]\huge\purple{Hi!}[/tex]
the answer is d.pacific ocean is the largest ocean in the world it is also the world's deepest ocean.
Option d is correct. Pacific Ocean is the largest ocean in the world.
The Pacific Ocean, A body of seawater that stretches from the Antarctic region in the south towards the Arctic Circle in the north and is sandwiched between Asia and Australia on the west and South and North America on the east. It covers roughly one-third of the earth's surface and is arguably the largest of the world's oceans. Its total area, excluding neighbouring seas, is estimated 63,800,000 square miles (165,250,000 square kilometres), which is twice the size of the Atlantic Ocean and larger than the entire land area of the world. It has a mean depth of 14,040 feet (4,280 m). The western Pacific is known for its numerous outlying seas.
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