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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Question 7 (True/False Worth 1 points)
(05.03 LC)
The correct way to calculate population density is by dividing the total population by the land area.
O True
O False
Answer: true
Explanation:
3. what is an ecosystem?
o a group of animals of all the same species in an area
a group of living and nonliving things
the process for converting energy into food
the relationship between plants and animals
Answer:
A group of animals of all the same species in an area.
Explanation:
A chamber within a bone normally filled with air is a:
A chamber within a bone normally filled with air is a sinus
What is a sinus?A sinus is a sac or cavity in an organ or tissue, or an abnormal cavity formed as a result of the destruction of tissues.
Sinus also refers to paranasal sinuses, which are air cavities in the cranial bones, near the nose and connecting to it.
Some individuals have four paired cavities found in the cranial bone or skull.
Thus, sinus is a chamber within a bone normally filled with air.
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In a laboratory, students used a stimulus that decreased the distance between R waves on an ECG. This represents a _____. increased length of time for one heartbeat and increased heart rate decreased length of time for one heartbeat and increased heart rate decreased length of time for one heartbeat and decreased heart rate increased length of time for one heartbeat and decreased heart rate
The information represents a B. decreased length of time for one heartbeat and increased heart rate.
What is stimulus?It should be noted that stimulus means a change in the structure of an organism based on the environment.
In this case, in the laboratory, the students used a stimulus that decreased the distance between R waves on an ECG. This leads to decreased length of time for one heartbeat and increased heart rate.
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How does phosphorylation control protein activity?.
Answer:
Phosphorylation offers a dynamic way to regulate protein activity and subcellular localization, which is achieved through its reversibility and fast kinetics. Adding or removing a dianionic phosphate group somewhere on a protein often changes the protein's structural properties, its stability and dynamics.
Explanation:
cells that are thick in the middle and tapered towards the end are called _________ cells
Cells that are thick in the middle and tapered towards the end are called fusiform cells
What are fusiform cells?Fusiform cells are those cells that has a spindle-like structure which means that it is thinner at the extremes and larger at the center.
A typical example of fusiform cell are the cells of the dorsal cochlear nucleus (DCN).
Therefore, cells that are thick in the middle and tapered towards the end are called fusiform cells
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How many times does the Krebs Cycle turn for one molecule of glucose?
Two turns of Kreb's cycle are needed for one molecule of glucose.
The Kreb's CycleThe cycle represents part of the process of breaking down glucose to extract the locked energy in the form of ATP.
Each glucose molecule to be broken down first undergo glycolysis at the end of which 2 pyruvate molecules are produced.
Each turn of the Kreb's cycle requires a molecule of pyruvate. Thus, the two pyruvates molecules generated from single glucose will require 2 turns of Kreb's cycle.
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The reason that skin cells start to swell after soaking in water is that the cell membranes are
What reduces friction around the lungs as they expand and contract?
The answer choice which reduces friction around the lungs as they expand and contract is; Choice C; Pleural fluid.
What reduces friction around the lungs as they expand and contract?A membrane with two layers, termed the pleura surrounds the lungs. A slippery liquid called pleural fluid acts as a lubricant to reduce friction in the space between those two layers, called pleural cavity during breathing.
Remarks:
A. Surfactant
B. Synovial fluid
C. Pleural fluid
D. Mucus
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For each sediment in the list below, record in the table whether you would be more likely to find the sediment near location A or location B in
the diagram of the stream.
SEDIMENT LIST
cobble
Silt
Clay
Sand
Boulder
IN THE PICTURE B IS CUT OFF, SORRY ABOUT THAT! B IS LOCATED RIGHT AT THE BOTTOM OF THE PICTURE.
Thanks so much for your help!
Silt, clay, and Sand would be more likely to find the sediment near location A, while cobble and boulder would be more likely to find the sediment near location B in the diagram of the stream.
What are Sediments?Sediments may be defined as naturally occurring elements or materials that are broken down into small pieces of fragments due to weathering and erosion.
The sediments of silt are found in soil along with other types of sediments such as clay, gravel, and sand. While cobble and boulders are those sediments that are found in the mountainous part of the geographical locations.
Thus, it is well described above.
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Disavantages of carbon
Answer:
Disavantages if Carbon: Carbon can cause climate change by trapping heat, and they can contribute to respiratory disease from smog and air pollution.
What is the structure and function of microtubules?
Structurally microtubules are composed of alpha and beta-tubulin, whereas their functions include cell division, structural support, etc.
What are microtubules?The microtubules are key proteins present in eukaryotic cells that form part of the cytoskeleton.
Microtubules are composed of subunits of alpha and beta-tubulin that link together to form structures 24 nm thick.
In conclusion, structurally microtubules are composed of alpha and beta-tubulin, whereas their functions include cell division, structural support, etc.
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After absorption, long-chain fatty acids and monoglycerides inside intestinal cells are
After absorption, long-chain fatty acids and monoglycerides inside intestinal cells are reformed into triglycerides.
Where are long chain triglycerides absorbed?As previously mentioned, MCTs do not delay gastric emptying and are absorbed faster in the intestine than MCTs, being transported via blood to the liver.
In this case, long-chain triglycerides are oils or fats of vegetable or animal origin, and are obtained from the reaction between a fatty acid and glycerol.
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Suppose that a person takes a fall while hiking and develops tetanus when the pathogen enters through an open wound in their arm. They do not spread the tetanus infection to anyone else. The tetanus infection is considered to be ______.
The tetanus infection is considered to be a Droplet infection.
What is Tetanus?
Tetanus is a neurological disease which is characterized by the occurrence of spasms in the muscle.
Tetanus can be caused if initial care does not take place after the wound occurs and therefore, it is very important to immediately take care of the wound.
To treat the wound tetanus immunoglobulin and tetanus toxoids are given to the person, however, it is necessary to give the two injections using different syringes and at different sites, because the immunoglobulin can cause neutralization fo the toxoid.
Thus, this could be the answer.
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Which is considered a chemical mutation? tanning beds, tobacco, X-rays, or sunlight
Explanation:
chemical mutations are those chemical which change the DNA molecule in such an extent that it function and make different expressions of gene
tobacco is considered as chemical mutation
how is an action potential generated ?
The action potential generated through a threshold or suprathreshold stimulus on a neuron.
Where is the action potential generated?The action potential (AP) originates thanks to a disturbance of the resting state of the cell membrane, with consequent flow of ions through the membrane and alteration of the ionic concentration in the intra and extracellular environments.
In this case, is a rapid change in the electrical potential of neuron membranes.
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Which muscle contributes to external rotation of the glenohumeral joint?
According to the research, the infraspinatus contributes to external rotation of the glenohumeral joint.
What is the infraspinatus?It is a flat muscle, which is part of the rotator cuff of the shoulder, it fulfills the function of stabilizing the joint surfaces involved in the glenohumeral joint, performing external rotation.
In other words, this muscle performs similar movements and shares the same place where they are inserted, with the supraspinatus, the teres minor and the subscapularis.
Therefore, we can conclude that according to the research, the infraspinatus contributes to external rotation of the glenohumeral joint.
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A housewife used excessive amount of sodium nitrate and phosphate fertiliser to her tree,
after 3 days, she found her tree had withered and died.
Answer:
excessive amount of fertiliser can cause high amount of acidic medium to the plant which can lead to death of many microbes necessary for the plant to survive.
there are a certain conditions in which the plants can survive, any change to that or Amy change in habitat will lead the plants to died
What adaptations does the small intestine make for absorption?
The small intestines are well adapted for absorbing nutrients during digestion by being very long, having villi and microvilli that increase surface area, using muscular contractions to move and mix food, and receiving and housing digestive enzymes and bile that help the breakdown of food.
The adaptations in which the small intestine make for absorption is the presence of a finger-like structure called villi.
What is Villi?These are finger-like structures found in the small intestine which increase the surface area for absorption.
They possess blood vessel which ensures the nutrients are transported to other parts of the body.
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The cell membrane is said to be:
[tex]\huge\mathfrak\red{ANSWER}[/tex]
Semi-PermeableExplanation is in the pic
Hope it heps
Answer:
The cell membrane is said to be semi-permeable.Explanation:What is meant by a semi-permeable membrane?✈This is a membrane which allow only certain substances to go in or out of the cell.
The Cell membrane of living cells is said to be a semi permeable membrane.
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5. How can we say that added sugar is not necessary for our health (it's not), when we learned that
aerobic cellular respiration uses glucose as a fuel source? (hint - where did hunter/gatherers our
ancestors, get sugar?)
Answer:
more than likely fruits and berries
or natural sugars
The body does not require any added sugar to stay healthy. Hunters/gatherers and our ancestors consumed fruits and milk that are natural sugar to obtain energy.
What is the difference between added sugar and natural sugar?Natural sugars are found in unprocessed food such as fruits and milk.Fruits contain fructose and milk contains lactose.On the other hand, added sugars are the artificial sweeteners that we often add to our daily diet in the form of white sugars and caloric sweeteners. From the perspective of health, it is always better to opt for natural sugar that keeps our body stable energy and stable metabolism.Added sugars are harmful when consumed in higher quantities.Hence, added sugar is not necessary for our health when we have learned that aerobic cellular respiration uses glucose as a fuel source that can be obtained from natural sugar.
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When mpf activity declines in a normal healthy cell it is due to _____
When mpf activity declines in a normal healthy cell it is due to degradation of cyclin.
What is the cell cycle?The cell cycle refers to the process by which new cells are formed by mitosis from an existing cells.
Several cell components are important in the cell cycle.
Cyclin is an important part involved in the cell cycle.
A decrease in cyclin due to increased degradation results in a decline in mpf activity.
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Based on the information in Experiment 3, if researchers wish to further study the inhibitor that is most effective under physiological conditions, they should choose the one that yields the lowest hGGT activity when GSH concentration is:
The experiment is NOT found here but to study which inhibitor is most effective under physiological conditions is required to use the Michaelis–Menten equation.
What is the Michaelis–Menten equation?The Michaelis–Menten equation is a model used to calculate the rate of change of substrates to products in a chemical reaction.
The Michaelis–Menten equation indicates that the velocity of the reaction is equal to the maximum rate of the reaction divided by the product between the Michaelis constant (km) and the concentration of substrate.
In conclusion, the experiment is missing here but to study which inhibitor is most effective under physiological conditions is required to use the Michaelis–Menten equation.
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What are homotopic brain areas? Group of answer choices regions of the cortex that are organized according to spatial maps of the environment areas in corresponding locations in the two cerebral hemispheres areas in the brain that are organized according to spatial and auditory frequency regions of the cortex found within the same cerebral hemisphere
The homotopic brain areas are the reas in the brain that are organized according to spatial and auditory frequency regions of the cortex found within the same cerebral hemisphere.
What are homotopic brain areas?It should be noted that the homotopic brain areas are the connectivity between the mirror areas of the brain hemisphere.
In this case, the homotopic brain areas are the reas in the brain that are organized according to spatial and auditory frequency regions of the cortex found within the same cerebral hemisphere.
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The major pathway of communication between the right and left hemispheres is the:.
The major pathway of communication between the right and left hemisphere is the corpus callosum.
The cerebrum is the recognizable gray covering of the human brain, appearing to comprise the majority of its mass. The cerebral cortex is the wrinkly area; the remainder of the anatomy is hidden behind that layer. The longitudinal fissure, which is a significant gap between the two sides of the cerebrum, exists. It divides the brain into right and left cerebral hemispheres, which are two independent parts. The main channel for communication between the two hemispheres of the cerebral cortex is provided by the white matter of the corpus callosum, which is located deep inside the cerebrum.learn more about corpus callosum here: https://brainly.com/question/13094825
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For plants living in a dry areas, explain a possible conflict between the need to obtain carbon dioxide for photosynthesis and the need to conserve water.
Plants living in dry areas face conflict.
EXPLANATION:
Since they live in dry areas they will undergo more transpiration. If they open stomata during the day there will be excessive loss of water vapor that will result in their death. Therefore plants living in this area open the stomata during the night to obtain Carbon dioxide.This checks the loss of water through transpiration and provides the carbon dioxide for photosynthesis.Abstract
Plants regularly face dry conditions. Not having enough water poses a serious threat to a plant’s ability to grow and develop or even just survive! If plants die, we will not have enough food to eat! How do plants manage to survive during water shortages? They must somehow be able to sense, respond, and adapt to changes in water availability. They do this through a range of techniques that allow for a plant to combat water shortages. A plant’s structural “armor” helps it to decrease the amount of water it loses to the environment and increase water storage. Plants respond to water shortages in very complex ways. These responses can include changes in the plants’ growth and in their ability to protect themselves against toxic chemicals that accumulate in the plant during dry periods. All of a plant’s responses are directly controlled by the plant’s genes. If we can understand the genes that are involved in protecting plants against drought, in the future we might be able to make genetically modified crops that can tolerate global warming and climate changes.
Have you heard people speaking about global warming and climate change? Do you know what these terms mean? These terms basically imply that the earth is getting hotter every year. These higher temperatures lead to unexpected and unusual weather patterns. One of these extreme weather patterns is frequent and severe droughts. Droughts are very long dry periods without any rain. What do severe droughts mean for plants? Well, plants are sessileAn organism that can’t move and stays in one place, like a plant., which means they stay in one place and can’t move around like we can. They can’t pull up their roots and relocate to a shady or damp spot. Therefore, plants somehow need to deal with these ever-increasing drought conditions, or they will simply die. Remember, plants are our food. We eat plants raw or cooked (those vegetables your mom insists you eat!) or processed, like your favorite box of breakfast cereal [which is made from wheat or maize (corn)]. So, if plants die because of droughts, we will not have enough food to eat!
If there is no water around, what can plants do to survive? Amazingly, all plants seem to have a number of genes for drought-defense strategies encoded in their DNA. Genes are small sections of DNA, like chapters in a book. How they use these genes determines their ability to survive drought.
Some plants are drought-resistant. When we talk about drought-resistant plants, we mean plants that can withstand dry conditions without dying. A drought-resistant plant can survive drought by using three defense strategies: escaping, avoiding or tolerating the loss of water [1]. Drought tolerant plants are quite rare in nature and can endure long periods with no water at all. Some of the most spectacular drought tolerant plants are called resurrection plants. Resurrection plants are able to survive long periods (up to 3 years!) without any water. However, give them a little water and they will spring back to life in a day or two. Other drought-resistant plants may not be as spectacular, but they too can survive short periods of drought using special techniques and defense strategies.
Some Plants Have Special Structures That Help Them to Survive in Drought Conditions
Some plants are able to survive droughts because of their unique structures. These structural features include the external armor of plants that protects them against water loss, as well as tools to help the plants absorb and store water. Drought-resistant plants can be specially adapted to live and survive in very dry environments. These plants often look quite different from plants living in areas where water is easily available. The drought-resistant plants normally have special “avoidance” (one of the defense adaptations!) features to make sure less water is lost to the environment or that more water gets absorbed and stored in the plant. Plants called desert succulentsPlants that have thickened and fleshy leaves and stems, in which water can be stored. are a good example of plants that have drought avoidance strategies [2]. Desert succulents have thick fleshy leaves, which often don’t resemble leaves at all, and they have a thick waxy layer to prevent water loss. Desert succulents also have extensive root systems that search for water under the dry desert soil (Figure 1). Some succulents have specialized roots that form large bulb structures, which are actually underground water reservoirs for the plant. These plants can survive years of drought using the water stored in their bulbs.
What causes an ionc bond?
Within a decade of the introduction of a new insecticide, nearly all of the descendants of the target pests were immune to the usual-sized dose. The most likely explanation for this immunity to the insecticide is that…?
Answer:
mqa-vivn-jei
Explanation:
truth and dare?
Answer - d: the pests developed physiological adaptations to the insecticide
Explanation: Pests become resistant by evolving physiological adaptations that protect them from the chemical.
Which factor helps determine the fertility rate of a group of people?
A. Wealth
B. Death rate
C. Farmland
D. Consumption rate
Explain how the structure of the nephron and its associated blood vesseles enable the kidney to carry out its functions
The explanation of how the structure of the nephron and its associated blood vessels is; As described below
What is the Operation of the Kidney?The way the kidney is enabled to carry out its' functions are the processes below;
Each human kidney is made up of approximately one million filtering units called nephrons. Now, each nephron includes a filter, called the glomerulus, and a tubule.
Finally, the nephrons work through a two-step process namely;
- The glomerulus filters your blood. Ultrafiltration in glomerulus - smaller molecules filtered out in the glomerulus (e.g. glucose, water, minerals)
- The tubule returns needed substances to your blood and removes wastes.
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