In the composition of the chromatography solvent used for mixes of chemicals with drastically differing polarities, a polar gradient is used.
Solvents: Hexane is a typical non-polar solvent for thin-layer and chromatography. There are numerous polar solvents that it can be utilized with.
As opposed to separate continuous phases like those found in suspensions, emulsions, and other non-solution mixtures, a solvent-solute mixture consists of a single phase with all solute molecules occurring as solvates (solvent-solute complexes).
There are three parts to the setup. A solution that rises the stationary phase as a result of capillary action is known as the mobile phase. The stationary phase typically consists of polar inorganic solvent water, while the mobile phase typically consists of a combination of non-polar organic solvents.
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When you touch a sharp object and cut yourself, your brain receives the pain messages from your hand and sends a signal back to your hand to pull away from the painful object. Those messages are sent to the hand using __________ neurons.
Question 12 options:
axial
efferent
afferent
sensory
Answer:
Sensory
Explanation:
Detects and responds to external signals
Which of the followingstatementsis true about the LargeGround Finch and theWoodpecker Finch?A. They are similarenough that their niches overlap, causingthem to competefor mostresources.B. Their beaks are adapted to different food sources,SO their niches will compete.C. They are different species,therefore their niches do not overlap and they do notcompete.D. Their beaks are adapted todifferent food sources, sotheir niches generally do notcompete.
The true statement about the Large Ground Finch and the Woodpecker Finch is: Their beaks are adapted to different food sources, so their niches generally do not compete.
They are different species, but this isn't enough for them to avoid competition, they don't compete because their niches are different enough, as their peaks have been adapted to different food sources.
The correct answer is option D.
Select all of the following of how organisms respond to external stimuli
An organism responds to external stimuli because of sensitivity.
Why do organisms respond to external stimuli?External stimuli are the number of factors present outside of the body that absorb by receptors and will lead to a response. External stimuli are temperature changes, vision, hearing, tasting, smelling, and sunlight for plants. Organisms respond to external stimuli to maintain homeostasis. Each organism has its range of sufferance. When an environmental condition (such as temperature) goes above or below an organism's optimal range, the organism experiences stress and responds to the stimulus. For example, external stimuli Plants grow towards light(external stimuli) sources, and if the direction of light is changed, the plant will also change its direction of growth to accommodate for survival.
So we can conclude that external stimuli are your body responding to medicine. Internal stimuli are your vital signs changing due to a change in the body.
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what is the cytoplasm in a human cell?
Which of the following partial reinforcement schedules applies a reinforce after a specific number of correct responses?
Question 9 options:
Fixed-ratio schedules
Variable-interval schedules
Variable-ration schedules
Fixed-interval schedules
Variable-ration schedules is reinforcement schedule where appropriate movements are reinforced after a varying number of responses.
Partial reinforcement schedules is defined as either fixed or variable, and as either interval or ratio. Combinations of these four rubric produces four kinds of partial reinforcement schedules these are fixed-ratio, fixed-interval, variable-ratio and variable-interval.
A variable ratio schedule means that the reinforcer is delivered after an average number of correct responses has occurred. This schedule creates a very high rate of response. some examples are Gambling and lottery games.
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What’s the correct answer answer asap for brainlist
Answer: it would be A
Explanation: The Krebs cycle uses pyruvic acid formed in glycolysis
since 1825 the classification of the red panda has changed many times. The red panda has beenclassified as being most closely related to bears, raccoons, seals, walruses and most recentlyskunks. Which explanation accounts for the change in the classification of the red panda?A. The tools and technology used to determine classification groupings have improvedovertime.B. modern scientists determine the classification of organisms using more detaileddescriptions.C. the red panda, along with the other animals considered to be related, evolved overtime.D. other species have changed, resulting in greater similarities to the red panda.
The correct answer is A. The tools and technology used to determine classification groupings have improved overtime. Technology advances spur scientifical advances.
Determine how many valence electrons come from each subshell in the following atoms:
Answer: I took this to mean that the question is asking how many v.e. are being contributed by O and P. So O has 6 valence electrons (it is in group 6), and 6*4 is 24. A total of 24 valence electrons. Similar method for P would give 5v.e. How does Kaplan get 10 for P and 8 for O?
Explanation:
7. Cell walls do a number of important things for plants including
providing them with structural support, putting a limit on the amount
of water they absorb and release, as well as providing general
protection for the cell. But if cell walls are so useful, why don't any
animal cells have them?
The endocrine system’s hormones are ____ messengers that travel through the ____
A. Chemical;Body’s organs
B. Electrical; bloodstream
C. Electrical; neural networks
D. Chemical; bloodstream
Answer: D) Chemical; bloodstream.
Explanation:
- Honestly I don’t know how to explain this besides the fact that it’s just how the system works
but hope this helps :)
Which of the following steps in a signaling pathway typically occurs first once a chemical messenger reaches a target cell?
Question:
Solution:
The cells recognize the stimuli (chemical messengers) through receptors. When the receptors bind to the signaling molecules, physiological responses are initiated, and depending on the nature of those physiological responses, the receptor will be a membrane receptor or an intracellular receptor. So, we can conclude that the correct answer is
A LIGAND BINDS TO A RECEPTOR.
-Which of the following statements about DNA replication is true?
a. Dna plymerases can add new DNA nucleotides only to the 5' end of an existing strand
b. The DNA strand that grows away from the replication fork is synthesized continuously from one initial primer
c. The DNA strand that grows toward the replication fork is synthesized discontinuously in short pieces called Okazaki fragments
d. DNA polymerases cannot initiate synthesis of a new DNA strand; they can only add bases to an existing strand.
-In eukaryotes, the mismatch repair mechanism is initiated by?
a. methylated DNA strand
b. acetylated DNA strand
c. strand specific nicks
d. double-strand breaks
Please help!!
The statement DNA polymerases cannot initiate synthesis of a new DNA strand; they can only add bases to an existing strand is TRUE about DNA replication while the mismatch repair mechanism is initiated by strand-specific nicks.
What are DNA polymerases?DNA polymerases are specific enzymes that add nucleotides during the semiconservative replication of DNA, which involves the synthesis of a new DNA strand for each daughter DNA molecule.
Moreover, the mismatch repair mechanism refers to the pairing between nucleotide sequences other in DNA and double stranded RNA (dsRNA) is initiated by strand-specific nicks in order to repair a given nucleotide sequence.
Therefore, with this data, we can see that DNA polymerases are essential enzymes used by the cell in order to synthesize a DNA strand during the process of semi-conservative DNA replication, which occurs before the process of cell division and may involve mismatch repair mechanisms.
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PLEASE IN NEED HELP PLEASE GIVE A GOOD EXPLANATION.
Wildflowers are plants that grow on the forest floor.
During a study, a scientist observed that wildflowers began to bloom before the leaves appeared on the tall trees above them and stopped blooming once the trees were full of broad leaves which blocked the sunlight.
Evaluate this observation and explain a limiting factor this is affecting the wildflowers on the forest floor.
Answer: A limiting factor of wildflowers on the forest floor is the sunlight. This affects the plant because the wildflowers cannot grow without sunlight and when the leaves block the sunlight they cannot grow.
Explanation:
Help please thank you!!
Ice cubs is faster heating in a stove than the microwave .Ice cubes melt almost immediately when heated directly.The ice cubes will instantly melt if you put them adjacent to lighted matches, use a hot stove, or use a lighter.
Why does ice cubes melt?
The velocity of the water molecules in the ice increases as energy is delivered to them.The ice melts as a result of the molecules' increased velocity, which is strong enough to resist the pull of the water molecules toward one another. Ice does melt in the microwave, but not as quickly as one might anticipate from a device that can quickly prepare meals.The majority of people do not believe that ice will melt in a microwave, The water molecules turn to line up with the microwaves' alternating electric field.The water heats up as they fast spin back and forth.The water molecules are fixed in place by the ice.They cannot rotate back and forth, therefore the microwaves cannot be converted into heat. according to magician and science enthusiast Jason Latimer.Before microwaving, place the ice cube and cover on top to generate steam that will allow the food to reheat completely.By adding the ice cube to the bowl, you give the microwave something to heat, and the steam is then distributed throughout the food, preventing leftovers from remaining cold.The water heats up as they fast spin back and forth.The water molecules are fixed in place by the ice.They cannot rotate back and forth, therefore the microwaves cannot be converted into heat. Ice is a solid form of water.The ice transforms into liquid water when heat (a type of energy) is introduced.0°C, the melting point, has been attained.Water will become water vapour, or water in its gaseous condition, if heat is applied indefinitely. You might assume intuitively that hot water always melts ice more quickly than cooler water, but this isn't always the case.See what happens if you drop a few ice cubes into warm water and then submerge a few more in frigid water.Warning: the cold tap will cause the ice to melt more quicklyThe water will begin to boil where it contacts the hot pan while it sits there.The best way to demonstrate it is to heat the skillet up till water touches it begins to boil.In reality, the steam will cause the ice to float just millimeters over the pan's bottom.
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Please write 5 sentences
Answer: Both have DNA, a plasma membrane, cytoplasms, and ribosomes. Prokaryotes are the oldest cell type, they are small and simple and lack a nucleus and organelles, and are single-celled. Eukaryotic evolved from prokaryotes, they are larger and more complex, they contain a nucleus and organelles unlike Prokaryotes, and can be single-celled or multicellular.
Explanation:
Choose a meat product that you eat, and construct a food chain that includes you as the final
consumer.
Typical meats include beef, chicken, turkey, and pork. Even though pigs are omnivores, all of these animals are mostly herbivorous.Animals find food along a single path, creating a feeding chain.
What is a Food Chain List?The way each living thing obtains its food is shown by a food chain. Some animals eat vegetation, while others prey on other creatures.For instance, a straightforward food chain connects trees and bushes, giraffes (who consume trees and shrubs), and lions (that eat the giraffes).It's a cliché that we've all heard thousands of times, whether to defend how we treat other animals or just to celebrate a carnivorous lifestyle: humans are at the top of the food chain.Each link in this chain provides food for the next link.However, ecologists have developed a statistical method for determining a species' trophic level—its position in a food chain.To learn more about What is a Food Chain List refer to:
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Butterflies eat flowers on plant ,plants eaten by goat and goat is eaten by human beings as meat.
Where are people located in the food chain?The apex of the food chain includes carnivores like polar bears and orca whales, which are not themselves preyed upon. According to recent research, we actually fall between between pigs and anchovies. With polar bears and orca whales at the top of the food chain, that places humans directly in the middle of the chain.
To create a food web, write out the primary producers, herbivores, omnivores, and carnivores for the chosen habitat. Connect them with arrows showing both predator and prey. The final product may look like an actual web or map. So here in this primary producer is plant primary consumer is goat and secondary consumer is human being.
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The carbon backbone of organic molecules can take on many shapes. How does this
affect the diversity of organic molecules? PLEASE HURRY
Carbon atoms are connected in long chains by covalent bonds, which form the skeletal framework for organic molecules.
What is carbon backbone?Carbon skeleton is also known as carbon backbone. All organic compounds are made up of carbon-carbon bonds, which form a carbon skeleton or backbone. The carbon atom has special effects that allow it to form covalent bonds with up to four additional atoms, making it excellent for use as the basic structural component, or "backbone," of macromolecules. This carbon backbone is made up of chains and/or rings of carbon atoms with the addition of an element such as nitrogen or oxygen on occasion. Substituted hydrocarbons are molecules with other elements in their carbon backbone. The term carbon skeleton refers to the pattern in which carbon atoms are bonded together in a molecule, ignoring other atoms and differences between single and multiple bonds.
Therefore,
Carbon atoms are connected in long chains by covalent bonds, which form the skeletal framework for organic molecules.
These carbon skeletons can differ in several ways, including: -length -shape -number and location of double bonds -other elements covalently bonded to available sites
The diversity of carbon skeletons adds to the complexity and diversity of organic molecules..."
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You compare two strands of mtDNA and discover that there are 3 differences in base pairs between them. Assuming that the mutation rate for the species that you are examining is 1 mutation every 20,000 years, how long ago did the two strands share a common ancestor? Write your answer in xxx,xxx format.
These two strands shared a common ancestor _____________ years ago.
pls need the help
The two strands of the DNA share a common ancestor before 60,000 years ago.
Given here that the mutation rate is 1 in every 20,000 years. So it takes 20000 years to take single mutation.
Thus , the third mutation can occur 3×20000 years = 60,000years.
A mutation is a change to an organism’s DNA sequence. Errors in DNA replication during cell division, exposure to mutagens, or viral infection can all cause mutations. Our cells are constantly undergoing mutations, yet very few of these have any negative effects on our health.
There are numerous explanations for why mutations typically don’t have significant effects. The majority of mutations occur in somatic cells, such as muscle or skin cells, and only have an impact on the cell in which they originate and cells that develop from that cell.
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I need help with this practice problem solving In your own words* give a general description of the species: Eastern cottontail
Description of eastern cottontail:
• Its scientific name is ,Sylvilagus floridanus,. This is the most common rabbit in North America (Canada, United States and Mexico). They are rather found in habitats that offer protection from their predators like meadows, fields and young forests.
• They are primary consumers as they eat plants including fruits, leaves, seeds and flowers. Their main predators are foxes, owls, hawks and small predatos.
The membrane of mitochondria contains embedded proteins.
What is the purpose of these proteins?
Responses
facilitate the synthesis of new proteins
facilitate the synthesis of new proteins
bind to nucleotides to form RNA
bind to nucleotides to form , R N A
help in the production of ATP
help in the production of , A T P
help break down organic material
The membrane of mitochondria contains embedded proteins. The purpose of these proteins is to (3) help in the production of ATP.
Mitochondria is a double membranous organ that is involved in the synthesis of energy component ATP. The inner membrane of the organelle is folded into finger like projections called cristae. They increase the surface area of the mitochondria so that more and more ATP can be produced.
ATP is Adenosine Triphosphate. It is a high energy compound. It releases energy when the 2 phosphate bonds of the triphosphate group are broken down. This energy is then used to perform various life processes of the body.
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What effect would an absence of oxygen have on the electron transport chain / ATP synthase system?
If there were no oxygen present on the electron transport chain, the electrons could not be removed from the system, and the entire electron transport chain would back up and stop.
What is electron transport chain?
The electron transport chain can be described as a series of protein complexes and other molecules that transfer electrons from electron donors to electron acceptors via redox reactions and couples this electron transfer with the transfer of protons across a membrane.
The electron transport chain produces the adenosine triphosphate which is the main cellular energy. If there were no oxygen present on the electron transport chain he entire electron transport chain would back up and stop.
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If you had an unknown microbe, what steps would you take to determine what type of microbe (e.g., fungi, bacteria, virus) it is? Are there particular characteristics you would search for? Explain.
The steps which would be taken to determine what type of microbe (e.g., fungi, bacteria, virus) is by using microscopy techniques.
What is a Microbe?This is referred to as the tiny and small organisms which are present in the earth and can't be seen with eyes except through the assistance of a microscope such as light microscope etc.
The microscope functions by enlarging the object or cell being studied and ensures that different structures are seen. For example the virus has capsids which differentiates it from other microbes present in nature thereby making it the correct choice in this scenario.
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Help asp please thank you
HELP ASAP!!!!
Which term is used to describe a
change in a population's allele
frequency as a result of
individuals moving into and out of
the population?
A. Succession
B. Natural Selection
C. Gene Flow
Answer:
Its The Gene Flow
Explanation:
Gene flow refers to the transfer of genetic material, specifically alleles, from one population to another through the movement of individuals. The correct option is C.
Gene flow occurs when individuals migrate or move between different populations, bringing their genetic variation with them.
When individuals migrate into a population, they introduce new alleles, potentially increasing the genetic diversity of the population.
When individuals emigrate from a population, they take their alleles with them, resulting in a loss of genetic diversity in the population they leave behind.
It can introduce new alleles that may provide adaptive advantages, enhance genetic variation, or counteract the effects of genetic drift.
It also has the potential to spread beneficial alleles throughout populations, improving their adaptive potential.
Thus, the correct option is C.
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ma group of Ainerican curl cats, some individuals have curled ears and others have straightears in this group, the gene for the ear type trait has two alleles. The allele for straight ears(ela recessive to the allele for curled ears (1)Kitty, an American curl cat from this group, has curled ears.Based on Kitty's phenotype for the ear type trait, which of the following could be Kitty'sgenotype for the ear type gene? Select all that applyELEeceSubmitWork it outNot feeling ready yet? This can help:
Based on Kitty's curled ears phenotype, that is the dominant type of the trait, so this phenotype will be shown both in dominant homozygous and in heterozygous. So her genotype can be EE or Ee.
Which of the following diseases is not caused by a virus?
Question 2 options:
polio
common cold
tuberculosis
influenza
Answer: Tuberculosis
Explanation:
TB is caused by a bacterium called Mycobacterium tuberculosis
what ingredients in fecal matter help with the growth of aquatic plants and algae?
Feces in the aquatic environment can be direct linked to the growth of some aquatic plants and algae because it enrich the soil of the river/lake for the aquatic plants populations. The fecal matter is rich in some inorganic components that are important for the vegetal growth, and that are useful to maintain a balance in the bacteria and decomposers in the aquatic environment. Phosphate, Nitrogen, and Ammonia are the most common elements responsible for the plants growth in this situation.
What is the product P?
Responses
A)Hydrogen
B)Glucose
C)Nitrogen
D)Energy
Answer:
D) Energy
Explanation:
I need help with this practice In your own wordsLook at my practice in the pic provided and answer in a summary (short 3 sentences)
Kudzu was intentionally introduced to North America by the Soil Erosion Service and Civilian Conservation Corps in the 1930s for the purpose of controlling soil erosion in the American Southeast. When kudzu was first introduced in the southeast, it was initially used as an ornamental vine to shade homes.
PEASE HELP PLEASE!? List and describe the substrates and products of TCA cycle
The components of TCA cycle are acetyl group, oxaloacetic acid, coA, citric acid etc. needed to start and terminate the TCA cycle.
What is TCA cycle and what are the components of TCA cycle?TCA cycle also called as Krebs cycle , called tricaboxylic acid, have certain amounts of water and acetyl co enzyme A to initiate.In the initiation the water and acetyle coA reacts and yields an appreciable amount of citric acid.This reaction is catalysed by enzyme citrate synthatase and a molecule of coA is released.Then the next step is isomerisation that is citrate is isomerised to isocitrate a substrate.Then comes decarbocylation, formed alfa ketoglutaric acid and then succinyl coA which is oxidised to OAA.To know more about TCA cycle:
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