When human red blood cells are placed in pure water, the cells immediately burst. which process explains what happens to the red blood cells?
Final answer:
Red blood cells burst or undergo hemolysis when placed in pure water due to the hypotonic environment causing water to flow into the cells more quickly than it can flow out. The cells' plasma membrane can only stretch so much before it breaks, releasing the cell's contents.
Explanation:
When human red blood cells are placed in pure water, they encounter a hypotonic solution. This means that the concentration of solutes is higher inside the cells compared to the surrounding water. As a result, water rushes into the cells through the process of osmosis, causing the cells to swell. Animal cells, including red blood cells, typically lack rigid cell walls that can resist the pressure of the incoming water. Instead, they have a plasma membrane that can only stretch to a limit.
Hemolysis is what occurs when red blood cells swell to the point where the plasma membrane is no longer able to contain the pressure, resulting in the cells bursting. The plasma membrane, which resembles a mosaic composed of lipids and proteins, has a fixed surface area and when this limit is exceeded by the swelling cell, it will lyse.
In a hypertonic solution, the water would flow out of the cells, causing them to shrivel up, a process called crenation. Conversely, in an isotonic solution, the movement of water in and out of the cell is equal, allowing the cell to retain its shape and function properly. Red blood cells lack the regulatory mechanisms many other cells have to prevent excess water uptake, which makes them particularly prone to hemolysis in a hypotonic environment like pure water.
A garden aboard the International Space Station allows space scientists to research the growth of plants in space. This research is important because astronauts will need to grow their own food to survive long space journeys. What challenges would you expect scientists to face when growing plants in space? What challenges will the astronauts have with meeting their own energy needs? Scientists are also evaluating plants for gene mutations that would help them grow better in space environments. What traits could a plant have that would help it grow better in space?
Explain why tropical rain forests contain a large variety of plants and animals
Tropical rainforests occupy only 2% of the earth’s surface but it contains 50% of plants and animals on Earth. The reasons why plants and animals are abundant in this place are:
1) Climate – Plants and animals get a lot of sunlight responsible for photosynthesis. Energy converted is stored by plants and then later consumed by animals.
2) Canopy structure- offers sources of food and shelter to plants and animals
This is the sample question on e academy:
Tropical rain forests are warm and wet, and the temperature does not vary much. Because of this, a huge variety of plants can live in tropical rain forests. Because there are so many kinds of plants, there are habitats for many different kinds of animals as well.
The total number of cells in an organism increases as a result of what
The pink parts of the graph represent the pH range where some common freshwater organisms survive. If the pH of a lake were to start at 3 and become more basic, at what pH would these freshwater organisms begin to die out?
4.0 As the pH increases, the first type of fish, catfish, would begin to die off at a pH of 4.0. By the time the pH increased to 5.5, all organisms would be removed.
A _____ remains when the nitrogen-containing portion of an amino acid is removed. select one:
a. fatty acid
b. ribonucleotide
c. carbon skeleton
d. dipeptide fragment
The removal of the nitrogen-containing part of an amino acid leaves behind its carbon skeleton. This includes the central ">-carbon attached to a carboxyl group, an amino group, and a variable side chain.
When the nitrogen-containing portion of an amino acid is removed, what remains is the carbon skeleton. The ">-carbon is central to the structure of an amino acid and is attached to a carboxyl group (C=O), the amino group (N-H), and a variable side chain, or R group, which distinguishes one amino acid from another. In a protein, the amino acids are linked by peptide bonds to form chains, where individual amino acids are referred to as residues.
During a heated argument with his father, mike was suddenly unable to move his right arm. medical examinations are unable to detect a physiological basis for the paralysis. it is likely that mike suffers from
What is underground layer of rock or sediment that holds water?
An aquifer is an underground layer of permeable rock or sediment that holds groundwater, which can be stored for a long time and accessed through wells for human use.
The underground layer of rock or sediment that holds water is known as an aquifer. An aquifer consists of permeable rock, like sandstone, that is saturated with groundwater, allowing water to percolate from the surface down through the rock's pores. The water in an aquifer is referred to as groundwater, which can also be stored in rock fissures or between particles of sand, dirt, and gravel.
The water within an aquifer is part of a larger cycle, where precipitation infiltrates the ground and is stored in these porous rock layers. The region where the rock is saturated with water delineates the water table, which is the upper boundary of the groundwater. Below an aquifer, there is typically an impermeable layer, such as clay, preventing the water from seeping further down. Groundwater in aquifers can remain there for millennia but can be accessed through wells to provide water for human use.
What is the advantage of crossing-over?
Final answer:
Crossing-over during meiosis leads to genetic diversity and gene recombination which are critical for species adaptation and evolution. It results in unique genetic combinations and limits mutation effects, enabling species like the sweetpotato to develop genetic variation essential for survival.
Explanation:
The advantage of crossing-over during prophase I of meiosis is significant since it contributes to genetic diversity. During this phase, homologous chromosomes pair up and exchange segments, which results in new combinations of genes on each chromosome. This process not only allows for genetic recombination, making it possible for offspring to have a unique genetic makeup different from both parents, but it also helps to limit the effects of mutations to specific areas around a gene rather than affecting an entire chromosome.
Gene recombination resulting from crossing-over is fundamental to evolution, as it leads to increased variation within a population. This variation is vital for the survival of a species as it enhances the ability of a population to adapt to changing environments. In species such as sweetpotato, which are highly heterozygous and generally self-incompatible, crossing-over enables the creation of genetic variation since seeds cannot develop through self-fertilization.
how does niche partitioning relate to biodiversity
Niche partitioning is a concept in ecology that relates to the coexistence of multiple species within an ecosystem. It refers to the division of resources and ecological niches among different species, allowing them to avoid direct competition and coexist in the same habitat.
When different species in an ecosystem occupy different niches and utilize different resources, they reduce direct competition for those resources. By utilizing different parts of the habitat or different food sources, species can coexist without significantly overlapping in their resource requirements. This partitioning of resources can occur in various ways, such as differences in foraging behavior, diet, spatial distribution, or temporal activity patterns.
The process of niche partitioning promotes biodiversity by allowing a greater number of species to coexist in the same ecosystem. When species occupy different ecological niches and utilize different resources, it reduces the intensity of competition for limited resources. This reduces the likelihood of one species outcompeting another and increases the chances of species coexisting and persisting over time.
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decay of organic matter is caused by?
What are the short-term effects on the land? (Flooding, coastal dune erosion, etc.)
Answer:
The short-term effects can take place by various types of processes such as flooding, earthquakes, dune erosion, and many others.
Due to the high amount of rainfall, flood occurs which is one of the natural disasters that can result from the collapsing of dams and natural levees. Some of the short term effects of flooding on land include the damage of household properties, agricultural crops and also affect the fertility of the soil. Every year, a lot of people dies due to flood
And, some of the short-term effects of coastal dune erosion include the increasing sea level, occurrence of frequent storms. The coastal sands are eroded as a result of which the coast becomes steeper.
You arrive on scene with your partner abe to find a 64 year old woman who is very obese. her son tells you she has a heart condition. she is unconscious with a baggie of what appears to be street drugs next to her. she is breathing at 18 a minute and regular - her pulse is 99 and her bp is 90/50. what is likely the cause for the low blood pressure?
Exercise is a good way to handle stress because
a. exercise increases oxygen supplies throughout the body, which helps in the handling of stress.
b. exercise will guarantee that the stress will go away.
c. exercise will allow you to come up with a solution to the stress.
d. the stronger you are, the less likely you are to be exposed to stress. brainly
Exercise is a good way to handle stress because exercise increases oxygen supplies throughout the body, which helps in the handling of stress. Hence option a is correct.
What is stress?Stress is defined as a typical sensation we get when we're under pressure, overwhelmed, or incapable of coping. You may find that all it takes to feel calmer is a little break from a stressful situation or some time away from your regular habits and thoughts. Emotional issues, depression, panic attacks, and other types of anxiety and worry can result from stress.
Your overall health and sense of wellness are enhanced by exercise, which gives you more energy throughout the day. But there are certain ways that exercise also directly lowers stress. It boosts the synthesis of endorphins. When you exercise, your brain may produce more endorphins, the feel-good chemicals.
Thus, exercise is a good way to handle stress because exercise increases oxygen supplies throughout the body, which helps in the handling of stress. Hence option a is correct.
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Nitrogen is one of the important elements for life. Nitrogen is present in DNA and proteins. It’s also a component of 1.water 2.chlorophyll or 3.air in plants, a pigment that’s critical for photosynthesis. Although nitrogen is present in the air, it can’t be consumed directly. It’s converted into usable form by 1. bacteria 2.animals or 3.plants .
Answer: first : Chlorophyll
Second : bacteria
Explanation: Nitrogen is vital component of chlorophyll, that plants use to trap sunlight to produce sugar from the elements like water and carbon dioxide by photosynthesis.
Nitrogen is also present in the proteins that is used by the plants. Without proteins, plant would die.
Although nitrogen is present in atmosphere plants cannot use it until it is converted by the bacteria in a usable form.
Plants do not utilize nitrogen in the form of nitrogen gas it has to be first converted by the bacteria in the from of nitrates.
Bones that join together and are held in place with sheets of collagen between the bones are called ____________ , teeth held in sockets by a fibrous ligament are ____________ , and ____________ are found between most of the bones of the skull.
Answer:
Bones JoinedPeriodontal ligamentSuturesExplanation:
Bones joined are the ones that join and held in place with threads of collagen, they are joined with cartilage between the ends, these are the most complex joints and are an important aid in body mobility.The periodontal ligament is the fibrous and connective tissue that joins the tooth to the alveolar bone or to the socket. The function of this ligament is supportive, sensory, and nutritive.All the bones of the cranium, excepting the mandible, are joined by a fibrous joint called a suture. These sutures have the capacity to permit a small quantity of movement between the bones of the skull. Human cranium has around 20 sutures.Bones joined by collagen sheets are called syndesmoses, teeth in sockets are held by a ligament referred to as gomphoses, and the skull bones connect through sutures, all comprising types of fibrous joints.
Bones that join together and are held in place with sheets of collagen between the bones are called syndesmoses, teeth held in sockets by a fibrous ligament are gomphoses, and sutures are found between most of the bones of the skull. The fibrous joints, also known as fibrous connective tissue, are what link these bones, allowing for little to no movement.
Particularly, syndesmoses involve a band of connective tissue binding the bones, allowing for more movement than in sutures but less than many other joints. Gomphoses, such as teeth anchored in the jaw, are a prime example of this type of fibrous joint. Lastly, sutures are almost exclusively found in the skull, tightly securing the bones with short fibers of connective tissue.
Which of the choices below is not a functional process performed by the respiratory system?
a.pulmonary ventilation
b.transport of respiratory gases
c.external respiration
d.pulmonary respiration?
The right answer is b.transport of respiratory gases.
Breathing is the process by which oxygen from the air gets into your lungs and gets into your body. Our lungs take oxygen from the air and carry it into our bloodstream, which carries it into the tissues and organs that allow us to walk, talk and move. Our lungs also remove carbon dioxide from our blood, through the air we breathe.
The transport of respiratory gases is provided by the blood.
* Oxygen is transported for about 99% in bound form to hemoglobin present in red blood cells.
* Carbon dioxide is transported for about 20% in bound hemoglobin form, the remainder being either dissolved in the plasma or as bicarbonate ion due to its hydration.
Science is not based on inquiry, but rather on facts.
True/False?,
How long does it take iriscode to generate a match?
Any substance that can stimulate the production of antibodies and combine specifically with them
Why did the removal of wolves from northern wisconsin change the makeup of the plants in the forest? question 1 options: wolves used to feed on some of the plants there, and without wolves, the plant population exploded. wolves disperse the seeds of pine trees, and without wolves, the seeds couldn't land in new places to germinate. wolves are important pollinators of many forest species, and without wolves, fewer plants could pollinate. wolves are predators of deer, and without wolves, more deer survived and ate more forest plants. save?
Answer:
Option- D.The wolves are predators of deer, and without wolves, more deer survived and ate more forest plants.
Explanation:
They act as the consumers of the herbivores, as the different organisms are there inside the ecological system or web in which the different organisms serves greater purpose while being a secondary, primary, and tertiary consumers.Along, with having the producers inside the ecological system.So, if there is decrease or increase in one specific species number or density inside any region then we would have an imbalance inside the whole food chain or mainly the ecological pyramid.A nurse educator explains a type of cardiac condition as "a heterogeneous group of diseases of the myocardium associated with mechanical and/or electrical dysfunction that usually exhibit inappropriate ventricular hypertrophy or dilation and often lead to cardiovascular death or progressive heart failure." which condition fits this definition?
As a health care worker, you are keenly aware of how important it is to avoid harming patients. you worry about inadvertently transmitting an infectious disease to an already compromised individual. according to the cdc, what is the most important thing you can do to avoid this?
Producers make up more biomass than primary consumers because _____.
a. only 10 percent of the energy at each trophic level is passed on to the next level
b. they do not eat anything
c. pound for pound, plant sugars are heavier than fat
d. both primary and secondary consumers eat grass
The correct answer is option a. only 10 percent of the energy at each trophic level is passed on to the next level.
The producers obtain their energy from the sunlight and convert it into usable form of energy for consumers. The primary consumers eat the plants, and obtain energy from the plants. On each trophic level, only 10 % energy is transferred to the succeeding one.
As only 10% of the energy is transferred to the next trophic level, the primary producers need to eat more plants in order to meet their energy requirement. This insufficiency of the energy transfer from one trophic level to another causes the decrease in the biomass on next level.
How many chromosomes does a human zygote have and where did these chromosomes come from originally?
The correct answer is b) 46.
A human zygote, which is formed by the fusion of a sperm cell and an egg cell during fertilization, typically contains 46 chromosomes.
These chromosomes originate from the gametes (sperm and egg cells) of the parents, each contributing 23 chromosomes to the zygote.Therefore, the zygote inherits a total of 46 chromosomes, half from the father (via the sperm) and half from the mother (via the egg). This combination of chromosomes forms the diploid set necessary for the development of a new individual.Complete Question:
How many chromosomes does a human zygote have and where did these chromosomes come from originally?
a) 48
b) 46
c) 23
d) 92
Pre-australopiths experienced environmental cooling that, over thousands of years, converted large parts of their african habitat from forest to savannah grassland. which adaptation emerged during this time to become one of the key distinguishing characteristics of our ancestors
Which form of water, when present in the atmosphere, is most likely to contribute to global warming?
Water vapor in the atmosphere is the form of water that most significantly contributes to global warming. This is due to its ability to absorb and emit thermal radiation, thereby enhancing the greenhouse effect. Increased global warming can result in more evaporation and therefore a potential increase in atmospheric water vapor.
Explanation:The form of water that, when present in the atmosphere, is most likely to contribute to global warming is water vapor. As an efficient greenhouse gas, water vapor absorbs and emits thermal radiation, which can lead to the heating of the Earth's atmosphere, a phenomenon known as the greenhouse effect.
Global warming can increase the evaporation of water from oceans and land, resulting in an increase in atmospheric water vapor. This can lead to a feedback loop, where the increased water vapor intensifies the greenhouse effect, leading to further warming and hence more evaporation. This phenomenon, in extreme cases, could lead to a runaway greenhouse effect, although this is a long-term scenario that could occur on a timescale of 500 million to 2 billion years, according to some estimates.
The role of water vapor in the atmosphere and the climate is closely connected to Earth's water cycle, where water from the land and oceans enters the atmosphere by evaporation or sublimation, condenses into clouds, and falls as rain or snow, thereby influencing the distribution and availability of water on Earth, including fresh water resources.
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Which function does a phytoplankton have in ocean ecosystems?
A.
producer
B.
consumer
C.
scavenger
D.
decomposer
Answer:
The answer is choice A. producer.
Explanation:
Phytoplankton are single-celled photosynthetic organisms often found in the ocean. They live in a special section of the sea called the photic zone of the ocean, in which photosynthesis is possible. They are organisms that give energy to others and are placed at the bottom of the food chain/food web, thus making them producers.
Fun Fact: Phytoplankton are classified/labeled as primary producers, which means they stand as the basis or basic foundation of the food chain/food web. They are crucial to the survival of their ecosystem. Without them, the environment cannot survive and thrive. (This also means much of the marine ecosystems we know today wouldn't be nearly as luscious and promising as they are without the primary producer phytoplankton.)
In case you want more proof:
what is an herbivore?
Land that is available for agriculture tends to be nutrient-poor
b.nitrogen-fixing bacteria are not as plentiful in agricultural soils because of the use of pesticides
c.grains raised for feeding livestock must be fortified and thus require additional nutrients
d.cultivation of agricultural land inhibits the decomposition of organic matter
e.the nutrients that become the biomass of plants are not cycled back to the soil on lands where they are harvested