Chemical attractants cause bacteria to make faster progress toward the stimulus by inhibiting tumbles.
Chemical attractants are substances that can attract bacteria and cause them to move toward the source of the attractant. When bacteria detect a chemical attractant, they can change the way their flagella move, which can influence their direction of movement. By inhibiting tumbles (random movements of the flagella), chemical attractants can enable bacteria to make faster progress toward the stimulus and increase their chances of reaching the source of the attractant. This is an example of chemotaxis, the process by which bacteria move toward or away from chemical stimuli in their environment.
Option C is the proper response, thus.
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Restriction Fragment Length Polymorphism (RFLP) allows a small sample of DNA to be amplified through replication.
A. True
B. False
Answer:
False
Explanation:
Answer:true
Explanation:because of DNA
cells typically have a high ceoncentration of solutes in them. what would happen to a cell placed in pure water?
If a cell is placed in pure water, it will undergo osmosis and may swell or burst.
Osmosis is the diffusion of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane. If a cell with a high concentration of solutes is placed in pure water, the water molecules will move into the cell, causing it to swell. If the cell continues to take in water, it may burst due to the pressure increase inside the cell.
On the other hand, if the cell is placed in a solution with a high concentration of solutes, water will move out of the cell, causing it to shrink. The balance between the concentration of water inside and outside the cell is critical for the cell's normal function and survival. An excessive increase or decrease in the water concentration can lead to the cell's death.
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why are central america and the andes mountains around cuzco cultural hearths ?
They are around Cuzco social hearths since they are focuses of culture and attractions for individuals to come and spread their thoughts.
Anthropologists call this district of Mexico and northern Focal America Mesoamerica. It is viewed as the district's social hearth since it was home to early human civic establishments.
The Inca human advancement emerged from the Peruvian high countries at some point in the mid-thirteenth hundred years, and the last Inca fortification was vanquished by the Spanish in 1572.
The Inca culture arose and immediately extended around 1200 Promotion not a long way from Lake Titicaca. The Incas previously vanquished their prompt adjoining clans and afterward those farther away. At their level, the Incan domain in the long run covered the vast majority of the Focal Andes.
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the term for the same (or similar) features arising in separate taxa not descended from a single close ancestor is:
The term for the same (or similar) features arising in separate taxa not descended from a single close ancestor is called evolutionary convergence.
Also called as convergent evolution. It is the independently occurring evolution of the same characteristics (such as body shape or behavior) among species or lineages that are unrelated or just distantly related and that often occupy the same ecological niches or locations.
Convergent evolution describes the development of similar or "analogous" structures across separate lineages that cannot be explained by the existence of a common ancestor.
A phenotypic resemblance may exist, in which case the lineages share the visible feature but have different underlying DNA sequences.
When species occupy comparable ecological niches and respond similarly to similar selective pressures, this is known as convergence in evolution.
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without a plasma membrane what would cells be unable to maintain
The membrane that separates the cell's interior from its external environment is called the plasma membrane. Without a plasma membrane, the cells would be unable to maintain homeostasis
Plasma membranes allow some substances through but not others because they are selectively permeable. The cell would die if the membrane lost this selectivity because it would no longer be able to sustain itself or maintain homeostasis. Certain substances are required by some cells in greater quantities than by others; They must be able to get these things from the extracellular fluids in some way.
The cell may have special mechanisms that ensure transport, or this may occur passively as certain materials move back and forth.
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 Evolution in a population of sea turtles can be caused by the following agent(s). O Genetic drift O All of the above can be agents. o Natural selection Gene flow
Evolution in a population of sea turtles can be caused by the following agent Option " All of the above can be agents " is a correct answer.
Evolution is the over many generations, slow change in the hereditary features of biological populations. These characteristics are the expressions of genes that are transferred from parent to child during reproduction.
Natural Selection : It is the process occurring naturally over a number of generations to increase the proportion of fit individuals in a population.
The characters are advantageous to the organisms.
Genetic drift : Random changes in the allele frequencies of a population, occurring only by chance , constitute genetic drift.
Gene flow : It refers to the change in allelic frequencies of a given population, when individuals migrate into the population ( immigration) or form the population ( emigration).
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Summarize Mendel's experiments, and the three laws of inheritance that make up the foundation of Mendelian genetics. The key principles of Mendelian inheritance are summed up by Mendel's three laws:
The three laws of Mendel include the Law of Dominance and Uniformity, the Law of Segregation, and the Law of Independent Assortment.
The Law of Dominance and Uniformity states that one of the two alleles, of a particular gene found at the same chromosomal locus are dominant over the other allele for the given gene.
The Law of Segregation states that each gamete made by an organism receives just one copy of gene which is selected randomly.
Mendel's law of independent assortment states that the alleles of two different genes get sorted into gametes independently of one another.
Who was Mendel?Gregor J. Mendel was an Austrian scientist and teacher who experimented on garden pea hybrids and is known as the father of genetics.
What is allele?The alternative forms of a gene at a locus is called allele
What is gene?Gene is the unit of heredity.
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Huda thinks that a fire was started by someone using a Molotov cocktail. What evidence would MOST likely lead her to make this conclusion?
A. a bullet casing
B.
pieces of a glass bottle
C. a gun
D.
dustings of gun powder
Pieces of a glass bottle refer to fragments or shards of broken glass from a bottle.
what is molotov cocktail?A Molotov cocktail is a makeshift incendiary device consisting of a bottle filled with a flammable liquid (usually gasoline) and a piece of cloth serving as a wick. When ignited, the cloth burns and the bottle breaks, spreading the flammable liquid and starting a fire.
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what is the name of cell organelle that is basically stained darker due to high protein concentration within?
cell organelle that is stained darker due to high protein concentration within is called the Nucleolus.
The Nucleolus is a membrane-bound organelle located within the nucleus of a cell. It is easily recognizable due to its dark staining properties when stained with certain dyes, which is a result of its high concentration of ribosomal RNA and proteins. The nucleolus is the site of ribosome biogenesis and is responsible for the assembly of ribosomal subunits that are later transported to the cytoplasm to carry out protein synthesis. The nucleolus also plays a role in other cellular processes such as cell growth and division, and has been implicated in various diseases such as cancer. Despite its importance, the nucleolus is not well understood, and more research is needed to fully understand the molecular mechanisms that regulate its function and behavior. Overall, the nucleolus is a critical component of the cell that plays a crucial role in protein synthesis and other cellular processes.
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select the cell counting methods that enable only living cells to be counted. check all that apply
Options A,B,C. These methods involves counting adding trypan blue, a vital stain, to the cell suspension. Live cells will not take up the stain, while dead cells will be stained blue and excluded from the count.
There are several methods that enable the counting of only live cells: This method utilizes a fluorescent dye that penetrates live cells but is excluded by dead cells. Fluorometry measures the fluorescence intensity of the sample, which is directly proportional to the number of live cells. This is a more elaborate method that involves staining counting cells with a combination of dyes that can differentiate between live and dead cells based on cellular counting metabolism. The live cells are then enumerated based on their fluorescence intensity.
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The complete Question is:
select the cell counting methods that enable only living cells to be counted. check all that apply
Fluorometry
Trypan blue exclusion test
Cell viability assay
cell counter
When a scientist uses many specific observations to construct a general scientific principle, the scientist is using reasoning.a. Trueb. False
Yes, that is true. Truuuuuuuue
Answer: A
Explanation:
why are bacteria and archaea classified into different domains
Bacteria and archaea are classified into different domains because of differences in their molecular biology and evolutionary history.
The difference between bacteria and archaea are as follows:1. Cellular structure: Bacteria have a simple cellular structure, whereas archaea have unique membrane lipid compositions, giving them a distinct and more complex cellular structure.
2. Metabolic processes: Bacteria and archaea have different metabolic processes, with bacteria being primarily heterotrophic and archaea being primarily autotrophic.
3. Genetic material: Bacteria and archaea have different genetic material. Bacteria have a circular chromosome, whereas archaea have a linear or circular chromosome and also have different types of RNA polymerases and ribosomal RNA.
4. Evolutionary history: Bacteria and archaea have different evolutionary histories and are thought to have evolved independently from a common ancestor, with archaea having a more ancient lineage.
These differences in cellular structure, metabolic processes, genetic material, and evolutionary history suggest that bacteria and archaea belong to different domains.
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To allow movement of the tendons within the carpal tunnel zone, each tendon is encased in a __________.
a.sheath
b.osseous membrane
c. meniscus
d.bursa
Each tendon is covered by an osseous membrane to facilitate movement of the tendons inside the carpal tunnel zone.
The carpal tunnel houses the median nerve as well as nine tendons, including the tendon of the flexor pollicis longus and the four tendons of the flexor digitorum profundus. Synovial tendinous sheaths, which enclose the tendons but permit unrestricted movement between them, surround them. Each tendon is covered by an osseous membrane to facilitate movement of the tendons inside the carpal tunnel zone.The flexor pollicis longus, the four flexor digitorum superficialis, the four flexor digitorum profundus, as well as the median nerve, are among the nine tendons that make up the carpal tunnel (B, C). When the median nerve is squeezed as it travels through the carpal tunnel, carpal tunnel syndrome results. The transverse carpal ligament runs across the top of the wrist and is connected to the carpal bones at the base of the wrist to create the carpal tunnel.
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two mechanisms of genetic change, and explain how each affects genetic variation.
Genetic variety is brought about through DNA mutation, which modifies the genes of people within a population. As new people enter a population carrying various gene combinations.
Describe DNA.
Describe DNA. Deoxyribonucleic acid, or DNA. It includes units known as nucleotides, which are biological building blocks. For most other organisms in addition to humans, DNA is an essential chemical. Our genes and genetic material, which make us distinct, are both contained in our DNA.
Where can you find DNA?
DNA is located inside the nucleus, a specific region of the cell, in eukaryotic species. Each DNA molecule needs to be neatly packaged because cells are very small and organisms have several DNA molecules per cell. This container
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What cell is unicellular and lacks a nucleus and membrane bound organelles?
sensory is to motor what ________ is to ________.
The relationship between sensory and motor systems can be compared to the relationship between input and output systems in the human body.
Sensory systems are responsible for receiving and processing information from the external environment, such as touch, sight, sound, and smell. This information is then transformed into neural signals and transmitted to the brain, where it is interpreted and integrated into our perception of the world.
Motor systems, on the other hand, are responsible for executing movements and actions in response to neural commands from the brain. The motor system receives information from the brain, processes it, and then generates a physical response, such as moving a limb or speaking.
In this way, the sensory and motor systems can be thought of as complementary systems, working together to allow us to perceive and interact with our environment. The sensory system acts as an input system, receiving information from the environment, while the motor system acts as an output system, generating actions in response to the input from the brain.
Thus, the sensory system can be said to be to the motor system what input is to output.
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What must be present to successfully break down fats during digestion?
To efficiently break down fats during digestion, emulsifier must be present.
'What is emulsifier?'
Any of the many chemical additives that aid in the suspension of one liquid in another, such as the combination of oil and water in margarine, shortening, ice cream, and salad dressing, are known as emulsifiers. Algin, carrageenan, and agar are only a few of the emulsifiers made from algae. Lecithins, like those in egg yolks, are additionally employed as emulsifying agents.
An emulsifying agent's basic structure consists of a hydrophobic component, typically a long-chain fatty acid, and a hydrophilic component that can be charged or uncharged.
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the chinese believe that certain types of food hold different meanings and that the food can bring them good or bad fortune. do you agree with this belief? explain your reasoning.
I agree with this belief to some extent. Chinese culture is based on the idea of balance and harmony, and food is often seen as a way to maintain this balance.
Different types of food are associated with different meanings and symbolism, such as good luck, prosperity, fertility, and health. Eating particular types of food can be a way of sending a message of good fortune, which can have a positive effect on one's life.
However, I don't believe that all types of food have the same level of power in bringing good or bad fortune. Ultimately, one's destiny is determined by the choices and actions one takes, and not just by what one eats.
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genetic engineering techniques are used to analyze and manipulate dna and rna. describe dna sequencing. explain how scientists can use dna sequencing to determine gene expression.
A. DNA Sequencing is a laboratory procedure that determines the exact sequence of nucleotides or bases in a DNA molecule. The base sequence determines the activities that occur in that organism.
B. Using DNA sequencing, we can determine the exact sequence of nucleotides or bases in a DNA fragment, which contains genes/regulatory instructions and so may govern genetic expression in an organism.
Genetic engineering is the use of technology to modify and manipulate an organism's genes. It is a collection of methods used to modify the genetic makeup of cells, including gene transfer inside and beyond species borders, in order to create better or unique creatures. New DNA is created by isolating and copying genetic material of interest using recombinant DNA technologies or by synthesizing DNA artificially.
To transfer this DNA into the host organism, a construct is often built and used. Paul Berg created the first recombinant DNA molecule in 1972 by mixing DNA from the monkey virus SV40 with lambda virus. In addition to adding genes, the method may be used to delete, or "knock out," genes. The new DNA might be introduced at random or to a specified region of the genome.
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how are the mouths of pythons adapted to swallowing large prey?
They are able to ingest chunks of food that are far larger than their own heads and can even be larger than their entire bodies.
Snakes accomplish this by first opening their jaws at the very tip and at the point where the jaws articulate with the skull, and then by slowly sliding their jaws over the target food item in a series of little steps.
Constrictors like snakes like the python. They begin by biting their prey, and then very swiftly wrap their powerful coils around it, severing the animal's critical blood flow. After the animal has died, they consume it in its entirety at their own pace. The larger the animal that a snake consumes, the more vitality it can extract from its food.
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taking into account the rh factor, which blood group is the universal recipient?
The universal recipient is someone with blood type AB+. This is because AB+ blood contains both A and B antigens, but no Rh factor antigens, so it can receive any blood group without triggering an immune response.
People can either be positive (have the protein) or negative (without the protein) for the RH factor, which is a protein present on the surface of red blood cells (do not have the protein). Two antigens (proteins) on the surface of red blood cells, designated as A and B, are used to categorize blood types. People with type A blood have A antigens, while those with type B blood have B antigens. An individual with type AB blood possesses both A and B antigens.
Being able to accept blood from any blood donor thanks to the absence of Rh factor antigens on their red blood cells, an individual with the blood type AB+ is referred to as the universal recipient.
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white-tailed deer are seasonal breeders. female white-tailed deer begin their reproductive cycle in the fall. rising testosterone levels in male white-tailed deer cause them to start their breeding season around the same time. offspring are born the following spring and summer. what is the most likely explanation for white-tailed deer having a seasonal breeding cycle instead of a monthly breeding cycle like many domesticated animals?
The explanation for the white-tailed deer having a seasonal breeding cycle should be that deer provide birth in the spring and summer.
It is considered to be animal species so it should be successfully mated at the time of specific times of the year. It permits the optimization of survival of young because of factors like food, water availability, etc
So, here deer provide birth in the spring and summer for avoiding the pregnancy at the time of hot summer months.
emit carbon dioxide and other pollutants into the atmosphere, causing global warming and, in extreme situations, destroying forest ecosystems. The ensuing smoke Wildfires and haze may travel for kilometers, causing public health issues when people inhale dangerous quantities of toxins.
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identify the parts of the nervous system that sense and communicate knee soreness so a person knows to stop running and rest. ? o Autonomic o Peripheral o Somatic o Central
The parts of the nervous system that sense and communicate knee soreness so a person knows to stop running and rest is the peripheral nervous system.
The central nervous system and the peripheral nervous system are the two major divisions of the nervous system in humans and other vertebrates.
The brain and spinal cord make up the central nervous system (CNS). The entire information analysis process happens in the CNS.
Sensory neurons and motor neurons are both a part of the peripheral nervous system (PNS), which is made up of neurons and neuronal fragments outside of the central nervous system. Motor neurons transport messages from the CNS while sensory neurons bring signals into the CNS.
The PNS is composed of the autonomic nervous system, which regulates bodily functions automatically, and the sensory-somatic nervous system, which communicates sensory data from the skin, muscles, and sensory organs to the central nervous system and sends motor instructions from the central nervous system to the muscles.
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enzyme that breaks down starches into simple carbohydrates, called
amylase enzymes are responsible for the break down of starches.
What is amylase?An amylase is an enzyme that accelerates the breakdown of starch into sugars. Humans and certain other mammals produce amylase in their saliva, where it starts the body's chemical process of digesting.
The pancreas and salivary glands both secrete human amylase. These enzymes break down dietary starch and glycogen. The enzyme activity of human salivary and pancreatic amylases are identical. However, their electrophoretic mobility, molecular weight, and carbohydrate content vary.
Since salivary amylase is transported with the meal into the stomach and small intestine, where it continues to be active, salivary amylase may be responsible for a significant portion of the digestion of starch and glycogen.
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during prophase i replicated homologous chromosomes pair up and undergo synapsis. what testable question is generated regarding synapsis and genetic variability by figure 1 ? responses is the distance between two gene loci related to crossover rate? is the distance between two gene loci related to crossover rate? does crossing over occur more often in some chromosomes than in others? does crossing over occur more often in some chromosomes than in others? is crossing over inhibited by methylation? is crossing over inhibited by methylation? is crossing over promoted by methylation?
During prophase I replicated homologous chromosomes, paired up and undergo synapsis. The testable question that is generated regarding synapsis and genetic variability by figure 1. The correct option is Option A. Responses is the distance between two gene loci related to crossover rate?
Generally the distance between the two genes is directly proportional to the strength of crossing over. When the distance between the genes increases the probability of crossing over increases as the separation between two gene is more therefore it is easier to crossover. Again it is said that the homologous chromosomes had undergone synapsis. Therefore the question of option A is most relevant. Crossing over is said to be a cellular process that happens during meiosis when chromosomes of the same type are lined up. When two chromosomes from two parents that is one from mother and the other from father, parts of the chromosome can be switched. The two chromosomes usually contain the same genes, but may have different forms of the genes.
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Which cell organelle is present in both prokaryotic and eukaryotic cells?A. Endoplasmic reticulumB. MitochondriaC. NucleusD. Ribosome
D. Ribosome are cell organelle is present in both prokaryotic and eukaryotic cells.
Ribosomes are cellular organelles present in both prokaryotic and eukaryotic cells that are responsible for protein synthesis. They are composed of two subunits, a small and a large subunit, which come together to form the functional unit. Ribosomes read the genetic code, which is stored in messenger RNA (mRNA), and use it to assemble a chain of amino acids, which form a protein. This process is known as translation. Ribosomes can exist freely in the cytoplasm or be attached to the endoplasmic reticulum, where they can help synthesize proteins destined for secretion from the cell. The structure and function of ribosomes are highly conserved across all living organisms, making them important targets for antibiotics that disrupt protein synthesis. By understanding the role of ribosomes, scientists can learn about the fundamental processes of life and develop new treatments for diseases.
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what visual feature sets hyaline cartilage apart from other types of cartilage?
Hyaline cartilage distinguishes itself from other varieties of cartilage visually by having a matrix that seems transparent.
The transparent polyester material used to create Dentacomp Transparent Matrix has been created to make it simple to shape composite fillings. Due to its transparency, the flexible matrix band facilitates light transmission and easy polymerization of the composite. Transparency denotes honesty, openness, and responsibility.
In businesses, organizations, administrations, and communities, transparency is practiced. For instance, in a business relationship, a transparent agent clarifies fees up front so there are no surprises later. Transparent items are those that let all light rays pass through them. Air, water, diamonds, transparent glass, and lenses are a few examples of transparent objects.
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an uncastrated male horse, at least four years of age, is called a
An Uncastrated Male horse of At Least four years old is called a Stallion or Stud.
A mature male horse which is Uncastrated and is capable of Breeding is named as Stallion or Stud.Stallion has a very strong physique due to the presence of testosterone. It shows somewhat aggressive behavior but they also show a social behaviour of forming a group with stallions of all ages or sometimes will live with a harem of female horses.
They are also used in horse racing, horse riding or competitions if proper training is provided. A male horse is usually called a colt and a castrated male horse is called a gelding. When used for Breeding due to its genotypic and phenotypic qualities they are also called as Stud.
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Answer:
An Uncastrated Male horse of At Least four years old is called a Stallion or Stud.
Explanation:
A mature male horse which is Uncastrated and is capable of Breeding is named as Stallion or Stud.Stallion has a very strong physique due to the presence of testosterone. It shows somewhat aggressive behavior but they also show a social behaviour of forming a group with stallions of all ages or sometimes will live with a harem of female horses. They are also used in horse racing, horse riding or competitions if proper training is provided.A male horse is usually called a colt and a castrated male horse is called a gelding.When used for Breeding due to its genotypic and phenotypic qualities they are also called as Stud.
what are the different parts of a gene and how does each part participate in the process of transcription?
The different parts of a gene and each part participates in the transcription process are the promoter, the coding region, and the termination sequences that play a role from start to finish as well as the formation of the RNA in transcription.
Genes are genetic material contained in loci and fill chromosomes. The genetic material determines the characteristics of living things that can be passed on to their offspring.
Transcription is the process of a series of genetic expressions that occur in the nucleus of eukaryotic cells. In this process, the copying of the genetic code from the DNA template (template) into the messenger RNA (mRNA) occurs in the cell nucleus. The gene has three regions that play a role in the transcription process, namely the promoter, the coding region, and the termination sequence. The promoter is located near the transcription start site of a gene which controls the transcription rate of the gene while the termination sequences indicates the end of a gene which controls the mRNA degradation rate. While the coding region contains protein building information that is used as a template to produce RNA molecules in the transcription process.
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what are 3 common methods used to determine the number of cells present in a liquid culture?\
The 3 common methods used to determine the number of cells present in liquid culture are Hemocytometer counting Automated cell counters and Spectrophotometry. Determining the number of cells present in liquid culture is important in various fields, biology and medicine.
Hemocytometer counting: Hemocytometer counting is a manual method that involves counting the number of cells in a small defined area. A special glass chamber called a hemocytometer is used to count cells. The chamber has a grid etched on its surface, and cells are placed on it using a sample of the culture. The cells are stained to make them easier to see and count under a microscope. The number of cells in the defined area is then used to calculate the number of cells per millilitre of culture.Automated cell counters: Automated cell counters use electrical impedance or laser-based technologies to count cells. In electrical impedance-based cell counters, an electric current is passed through the cell suspension, and the impedance of the current is used to determine the number of cells present. In laser-based cell counters, cells are passed through a laser beam, and the scattering of the light is used to determine the number of cells. Automated cell counters are faster and more efficient than manual methods and provide more accurate results.Spectrophotometry: Spectrophotometry is a method that uses the measurement of light absorption to determine the number of cells in a liquid culture. The sample is first diluted and then the absorbance of the diluted sample is measured at a specific wavelength using a spectrophotometer. The absorbance of the sample is proportional to the number of cells present. The number of cells can then be calculated using a calibration curve. Spectrophotometry is a quick and simple method to determine the number of cells in a liquid culture, but it is not as accurate as other methods.To learn more about cells here:
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