A biochemical test, in the microbiology world, is used to determine:.

Eexonucleases that are not found in spliceosomes are actively cleaved. Here option D is the correct answer.

A spliceosome is a complex molecular machine that is responsible for removing introns from pre-mRNA and joining the remaining exons together to form mature mRNA. It is composed of several small nuclear ribonucleoproteins (snRNPs) and other associated proteins. The snRNPs are RNA-protein complexes that are involved in the recognition and processing of the pre-mRNA.

The mRNA is present in the spliceosome during splicing, as it is the substrate for the splicing reaction. The introns are also present in the spliceosome, as they are the target of the splicing reaction. The introns are recognized and bound by the snRNPs, which then catalyze the splicing reaction to remove the introns and join the exons together.

Exonucleases are enzymes that degrade RNA or DNA from the end of the molecule. They are not typically found in the spliceosome, as they would degrade the mRNA during splicing and prevent the proper processing of the pre-mRNA.

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Complete question:

Which is not found in a spliceosome that is actively splicing?.

A) snRNPs

B) mRNA

C) introns

D) exonucleases

Bony fishes, also known as osteichthyes, reproduce using two different methods: internal and external fertilization. In external fertilization, males release their sperm into the water where females will then release their eggs.

The eggs and sperm will then meet in the water and fertilization will occur. This method is commonly seen in fish that live in open water such as salmon and trout. On the other hand, internal fertilization is when the male deposits sperm directly into the female's body. This method is used by fish that live in more enclosed areas, such as rivers or lakes, where external fertilization is not possible. Internal fertilization is seen in fish such as guppies and swordfish. Overall, the method of reproduction used by a bony fish depends on their environment and adaptations for survival.

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The correct option is A. Vitamins is not a macromolecule that makes up cells.

Vitamin are organic compounds that are essential for normal growth, development, and overall health. They are micronutrients that are required in small quantities to perform specific physiological functions in the body. Vitamins are not produced by the body in sufficient quantities, so they must be obtained from food or supplements. There are two types of vitamins: fat-soluble vitamins, such as vitamins A, D, E, and K, which are stored in the body's fatty tissues, and water-soluble vitamins, such as vitamin C and the B vitamins, which are not stored in the body and are eliminated in the urine.

Each vitamin has a specific function in the body, such as promoting healthy vision (vitamin A), supporting bone health (vitamin D), acting as an antioxidant (vitamin E), and playing a role in blood clotting (vitamin K). Deficiencies in vitamins can lead to a range of health problems, such as scurvy (vitamin C deficiency) and night blindness (vitamin A deficiency). It is important to consume a varied, balanced diet that includes a range of foods rich in vitamins to ensure optimal health and prevent deficiencies.

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The statement is True. Plant height is a classic example of a single gene trait that is controlled by two distinct alleles - the dominant and recessive alleles.

The dominant allele typically codes for the tall phenotype, while the recessive allele codes for the dwarf phenotype. In a simple genetic model, a plant with two copies of the dominant allele (TT) will be tall, a plant with two copies of the recessive allele (tt) will be dwarf, and a plant with one copy of each allele (Tt) will be tall as the dominant allele masks the recessive allele.

This type of single-gene trait inheritance can be seen in many different plant species, including pea plants (studied by Gregor Mendel in the mid-1800s), as well as crops such as wheat, rice, and corn. In modern plant breeding, single gene traits are often targeted for modification to improve plant yield or resilience to environmental stresses.

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if you have a strain of E. coli where an early nonsense mutation has occurred in the gale gene, and grow that strain on galactose minimal media, it will have a certain phenotype when grown on galactose minimal media.

This phenotype is the inability to form colonies, as the mutated gale gene prevents the bacteria from being able to metabolize the galactose, thereby unable to proliferate. The E. coli strain will not be able to produce any colonies on the galactose minimal media because the gale gene mutation has caused it to lack the necessary proteins needed to break down the galactose, thus leading to its inability to form colonies.

In short, the phenotype of an E. coli strain with an early nonsense mutation in the gale gene when grown on galactose minimal media is the inability to form colonies due to its inability to metabolize the galactose.

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mm: homozygous recessive

bb: homozygous recessive

gg: homozygous recessive

rr: homozygous recessive

For the genotype mm, it is homozygous recessive because both alleles for the gene are identical and express the recessive trait. For the genotype bb, it could be either homozygous dominant or heterozygous since both alleles are the same, but further testing or observation would be required to determine the genotype.

For the genotype gg, it is homozygous recessive if the gene in question is for a trait that is expressed only in the absence of a dominant allele, but otherwise, it could be homozygous dominant or heterozygous. Finally, for the genotype rr, it is also homozygous recessive because both alleles express the recessive trait.

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In a cell, the flow of information begins with DNA, which is essentially a set of instructions for the cell. This information is first transcribed into messenger RNA (mRNA), which is used as a template for the production of proteins.

Here, correct option is C.

Proteins are the major building blocks of the cell, and they control all of the activities of the cell. RNA, on the other hand, is an intermediary between DNA and proteins. It carries the information encoded in DNA in a form that can be used to make proteins.

However, RNA itself cannot be considered a final product of the flow of information in a cell, as it cannot be used to perform any functions in the cell. Instead, it is the proteins that carry out the instructions encoded in DNA, and thus can be considered the final product of the information flow in a cell.

Here, correct option is C.

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complete question is :

which of the following molecules can be considered a final product in the flow of information within a cell? group of answer choices

A. rna protein  

B. rna can be the final product of a gene.

C. messenger RNA

D. dna protein lipid

Multicellular organisms are complex structures made up of various cells that work together to perform different functions. The organization of multicellular organisms can be divided into different levels.

At the simplest level, multicellular organisms are organized into cells that are grouped together to form tissues. Tissues are groups of cells that work together to perform a specific function, such as muscle tissue, connective tissue, or nervous tissue tissues are then organized into organs, which are structures made up of two or more tissues that work together to perform a specific function. Examples of organs include the heart, lungs, and liver organs are further organized into organ systems, which are groups of organs that work together to perform a specific task. For instance, the digestive system is made up of organs such as the stomach, intestines, and liver, which work together to digest and absorb nutrients from food.
Finally, all the organ systems of an organism are integrated into a whole, resulting in a fully functioning organism. Thus, the organization of multicellular organisms can be understood as a hierarchical system, from cells to tissues, organs, organ systems, and the entire organism itself.

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The correct answer to the given question is Option A.

Radial glial cells are specialized cells found in the developing brain of vertebrates. These cells act as guideposts for the migration of neurons and their precursor cells during embryonic development.

They also play an important role in the formation of new neurons. Radial glial cells are characterized by their long, thin, and highly branched processes that span the entire thickness of the developing cortex. As neurons migrate away from the ventricular zone along the radial glial fibers, the radial glial cells transform into intermediate progenitor cells. These progenitor cells continue to divide and give rise to new neurons and glial cells. Eventually, the radial glial cells differentiate into astrocytes, which are specialized glial cells that provide structural and metabolic support to neurons. Therefore, the correct answer to the question is (e) astrocytes. Radial glial cells are not transformed into oligodendroglia, microglial cells, or visual sensory neurons.

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Yes, enzymes involved in heme synthesis are sensitive to lead. Lead can interfere with the activity of several enzymes in the heme synthesis pathway, including ALAD and ferrochelatase. This can lead to a reduction in heme synthesis and ultimately result in disorders such as lead poisoning or anemia.

Aminolevulinic acid dehydratase (ALAD) is a heme-synthesis-related enzyme that is susceptible to lead. In the second phase of the heme production pathway, aminolevulinic acid (ALA) is converted to porphobilinogen (PBG) by ALAD. By attaching to the sulfhydryl groups in the enzyme and causing structural and functional disruption, lead can impede ALAD activity. Ferrochelatase, an enzyme that catalyses the conversion of protoporphyrin IX to heme in the last phase of heme synthesis, is one of the several heme-synthesis-related enzymes that can be impacted by lead exposure. Lead can obstruct the incorporation of iron into protoporphyrin IX, lowering heme production and ferrochelatase activity. Anaemia is only one of the harmful impacts that lead-induced heme synthesis suppression on the body may have.

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The genetic code is the set of rules by which information encoded in mRNA sequences is converted into proteins by the process of translation. In this code, each codon, which is a group of three nucleotides (bases), corresponds to one amino acid or a stop signal.

Therefore, to determine the maximum number of amino acids an RNA molecule can encode, we simply divide the total number of bases in the molecule by 3. In this case, we have an RNA molecule with 1500 bases, so the maximum number of amino acids it can encode is 1500 bases ÷ 3 = 500 amino acids.

It's important to note that in reality, the number of amino acids encoded by an RNA molecule is often less than the maximum possible due to factors such as stop codons, splicing, and post-translational modifications.

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The best estimate of how many bacterial cells there will be after 80 minutes is 16.

If a bacterium reproduces every 20 minutes, then in 80 minutes, it will go through 4 reproduction cycles. At each cycle, the number of bacteria doubles. Some bacteria, like Escherichia coli, can divide every 20 minutes when conditions are favourable, such as the right temperature and nutrients. This implies that one bacterium may produce 2,097,152 bacteria in just seven hours.

So, if we start with 1 bacterium, after the first cycle, we have 2 bacteria, after the second cycle, we have 4 bacteria, after the third cycle, we have 8 bacteria, and after the fourth cycle, we have 16 bacteria.

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In standard anatomical position, the trochlea on the humerus is positioned laterally, whereas the capitulum is positioned medially.

The given statement is False.

At the anterior and distal ends of the humerus, respectively, are two smooth, rounded surfaces that resemble knuckles. Surrounding these objects, the elbow flexes and extends.

The medial epicondyle and capitulum of the trochlea are situated on opposite sides of the same bone. Both the coronoid fossa and the olecranon fossa are directly inferior to it on both sides.

The trochlea, a region with a pulley- or spindle-like form that articulates with the ulna bone, is the more medial of these areas. The capitulum, a knob-like feature found on the anterior surface of the distal humerus, is placed directly lateral to the trochlea.

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Spiral galaxies contain both old and young stars, as demonstrated best by our Milky Way, as stated. Our Smooth Way cosmic system is winding and has an unequivocal shape and furthermore a blend of old and youthful stars. the correct answer is (A).

Young stars, gas, and dust make up spiral galaxies. The dust is visible in the dark areas of the spiral arms. The gas and residue are utilized to make new stars, and this child stars gleam brilliantly. These facts help astronomers determine that spiral galaxies are typically young.

Twisting worlds have three apparent parts: a flimsy plate made out of stars, gas, and residue; a focal lump of more established stars; and a spherical halo of massive star clusters and the oldest stars. An elegant spiral pattern in the disk is these galaxies' signature.

The bulge, a central concentration of stars, and a flat, rotating disk containing stars, gas, and dust make up the majority of spiral galaxies.

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If students in previous semesters had removed some of the corn kernels from the genetic corn ears before you counted them, it would have a significant effect on your results. This would lead to a decrease in the total number of corn kernels, resulting in an underestimation of the actual yield of the corn ears.

Removing some of the corn kernels from the genetic corn ears before counting them would result in a reduced number of kernels, ultimately leading to an underestimation of the yield. This would affect the accuracy of the data collected and the overall analysis of the results.

Therefore, it is important to ensure that the corn ears are not tampered with in any way before conducting a yield analysis. Any interference can impact the accuracy of the results and affect the overall conclusions drawn from the data.

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Mitosis and meiosis are two types of cell division that differ in terms of their outcomes and ploidy. Mitosis is a type of cell division that results in two identical daughter cells, each with the same number of chromosomes as the parent cell. This means that the ploidy level remains the same before and after mitosis. For example, if the parent cell was diploid (containing two sets of chromosomes), the daughter cells will also be diploid.

Meiosis, on the other hand, is a type of cell division that results in four genetically diverse daughter cells, each with half the number of chromosomes as the parent cell. This means that the ploidy level is reduced by half after meiosis. For example, if the parent cell was diploid, the daughter cells will be haploid (containing only one set of chromosomes).

In summary, mitosis maintains the same ploidy level while meiosis reduces it by half.
Hi! Mitosis and meiosis are two types of cell division with different outcomes in terms of ploidy.

In mitosis, a diploid cell (2n) divides to produce two identical daughter cells that are also diploid (2n). This process consists of one round of cell division and maintains the same ploidy level as the original cell. The steps involved in mitosis include prophase, metaphase, anaphase, and telophase.

In meiosis, a diploid cell (2n) undergoes two rounds of cell division, resulting in four non-identical haploid cells (n). The first round, meiosis I, separates homologous chromosomes, while the second round, meiosis II, separates sister chromatids. This process reduces the ploidy level by half, creating haploid cells. Meiosis is essential for sexual reproduction and genetic diversity.

In summary, mitosis maintains the same ploidy level (diploid) in daughter cells, while meiosis reduces the ploidy level from diploid to haploid in the resulting cells.

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Patent ductus arteriosus (PDA) is accurately described as a communication between the aorta and the pulmonary artery.

Patent ductus arteriosus (PDA) is a congenital heart defect where the ductus arteriosus, a blood vessel that is present in the fetus but usually closes shortly after birth, remains open. This causes blood to flow from the aorta to the pulmonary artery, leading to increased blood flow to the lungs and potentially causing breathing difficulties. PDA can also increase the risk of infections in the lungs and heart, as well as heart failure.

PDA is usually diagnosed by a doctor listening for a heart murmur and can be confirmed through an echocardiogram. Treatment options include medication or surgery to close the ductus arteriosus. If left untreated, PDA can lead to long-term complications and affect the individual's quality of life.

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Working memory processes visual and verbal information through two subsystems: the visuospatial sketchpad and the phonological loop. The visuospatial sketchpad handles visual and spatial information, while the phonological loop deals with verbal and auditory data.

Visual information enters the visuospatial sketchpad through our eyes, while verbal information is processed by the phonological loop as we hear or read words. Both subsystems interact with the central executive, which controls and coordinates their activities.

The central executive allocates attention and resources to manage the information processed by the visuospatial sketchpad and phonological loop. It also integrates information from long-term memory to facilitate problem-solving and comprehension. In essence, working memory enables us to manipulate and store visual and verbal information temporarily, allowing us to perform cognitive tasks such as reading, problem-solving, and mental calculations.

To summarize, working memory processes visual and verbal information through the visuospatial sketchpad and phonological loop subsystems. The central executive directs the activities of these subsystems and integrates information from long-term memory to facilitate cognitive tasks.

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Lack of sanitation infrastructure: Many developing countries lack adequate sanitation infrastructure, such as toilets and waste treatment facilities.

In some developing countries, agricultural practices such as heavy use of pesticides and fertilizers can lead to contamination of local water supplies with chemicals and toxins.Poor waste management  Many developing countries lack proper waste management systems, and waste is often dumped directly into water bodies, causing pollution and potential health risks for local communities.Fertilizers are substances that are added to soil or other growing media to supply essential nutrients to plants. They can be organic or inorganic in nature, and are used to promote plant growth and increase crop yields.The three primary macronutrients that are required by plants are nitrogen (N), phosphorus (P), and potassium (K), which are often referred to as NPK. Fertilizers are commonly labeled with these three numbers, indicating the percentage by weight of each nutrient in the product. For example, a fertilizer labeled 10-10-10 would contain 10% nitrogen, 10% phosphorus, and 10% potassium.

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The human body contains three main types of body fluids: plasma, cytosol (intracellular fluid), and interstitial fluid.

Here, correct option is A.

Of these three, plasma is the fluid that accounts for the most in the human body. Plasma is a yellowish liquid that makes up about 55% of the total body fluid. It is mainly composed of water and proteins and plays an important role in transporting nutrients, hormones, and other substances throughout the body.

Cytosol (intracellular fluid) is the fluid inside the cells and makes up about 25-30% of the total body fluid. This fluid carries out essential processes, such as helping to build proteins, and providing energy to the cells. Interstitial fluid is the fluid that surrounds the cells and makes up about 15-20% of the total body fluid.

Therefore, correct option is A.

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complete question is:

the following represents the main locations fluids are found in the human body. rank these body fluids in order from the fluid that accounts for most in the human body to the fluid that accounts for the least. group of answer choices

A. plasma, cytosol (intracellular fluid), interstitial fluid

B. cytosol (intracellular fluid),  interstitial fluid, plasma

C. interstitial fluid, cytosol (intracellular fluid), plasma

D. cytosol (intracellular fluid), plasma, interstitial fluid

Griffith's experiments with the bacterium S. pneumoniae were groundbreaking in understanding the transfer of genetic information and virulence. He observed that when he injected a mixture of dead, virulent cells and live, nonvirulent cells into mice, the mice developed pneumonia and died. He then injected the live, nonvirulent cells alone and found that the mice survived.

Griffith concluded that something from the dead, virulent cells had transformed the live, nonvirulent cells into virulent ones. He called this process transformation. He hypothesized that the genetic information for virulence was transferred from the dead, virulent cells to the live, nonvirulent cells, and that this transfer was responsible for the transformation.

Further experiments by Avery, MacLeod, and McCarty confirmed Griffith's hypothesis that DNA was the molecule responsible for transformation. This discovery was instrumental in the understanding of genetics and paved the way for future research in the field. In summary, Griffith's experiments with S. pneumoniae led him to conclude that the genetic information for virulence was transferred from dead, virulent cells to live, nonvirulent cells through a process he called transformation. This discovery was a major breakthrough in understanding the role of DNA in genetics.

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In animals with an open circulatory system, the extracellular fluid in the circulatory system is called hemolymph and the extracellular fluid outside the circulatory system is called interstitial fluid.

In an open circulatory system, the blood is not always contained within vessels, but rather flows freely in open spaces called sinuses. Hemolymph is the fluid that circulates through these sinuses, and it also serves as the animal's interstitial fluid, meaning it bathes the cells directly. Therefore, in animals with an open circulatory system, there is no clear distinction between the circulatory system and the interstitial fluid.

The open circulatory system is found in many invertebrates, such as insects, crustaceans, and mollusks. In these animals, hemolymph serves as both the circulatory fluid and the interstitial fluid.

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The Modern Synthesis, also known as the Neo-Darwinian Synthesis, is a scientific theory that integrates Darwin's theory of evolution by natural selection with genetics and other scientific disciplines.

Some key tenets of the Modern Synthesis include:

1. Evolution occurs through the process of natural selection, which acts on genetic variation within populations.

2. The primary mechanism of genetic variation is mutation, which creates new alleles that can be passed on to offspring.

3. Genetic drift and gene flow also play a role in shaping the genetic makeup of populations over time.

4. The central role of genetics in evolution is emphasized, with genes being the units of inheritance and the basis of evolutionary change.

5. The Modern Synthesis also incorporates the concepts of population genetics, which quantifies how genes change over time in response to natural selection, genetic drift, and gene flow.

Overall, the Modern Synthesis provides a comprehensive framework for understanding how evolution works, incorporating insights from genetics, paleontology, and other disciplines to explain the diversity of life on Earth.

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This is an example of natural selection, where the environmental pressure of the flooding stream resulted in a differential survival rate for mice with different alleles for fur color. The surviving mice with the white fur alleles had a better chance of passing on their genetic traits to the next generation, leading to a shift in the genetic makeup of the population towards more individuals with white fur.
Hi! This scenario is an example of genetic drift. Genetic drift refers to random changes in allele frequencies within a population, which can lead to a change in the genetic makeup of the population over time. In this case, the flood near the stream resulted in a higher percentage of mice with brown alleles being killed, thus increasing the proportion of white-furred mice in the next generation. This change in allele frequencies is due to chance rather than natural selection, making it an example of genetic drift.

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After ovulation, high levels of progesterone inhibit luteinizing hormone (LH) secretion.

This can be explained by the theory that progesterone exerts negative feedback on the hypothalamus and pituitary gland, which ultimately leads to a decrease in LH production.
High levels of progesterone inhibit luteinizing hormone (LH) secretion. In brief, this is an explanation of a hormonal feedback mechanism in the female reproductive system.

The theory behind it is that progesterone helps maintain the uterine lining for a potential pregnancy, and inhibiting LH secretion prevents further ovulation during the same cycle.

Hence, After ovulation, high levels of progesterone inhibit luteinizing hormone (LH) secretion.

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The genetic basis for aggression states that genes are important in understanding the biological basis of aggression.

The genetic basis for aggression refers to the idea that certain genes may contribute to the development of aggressive behavior in individuals. While environmental and social factors may also play a role, studies have shown that genetics can have a significant influence on an individual's propensity towards aggression. Understanding the specific genes involved in aggression may provide insight into potential treatments or interventions for individuals who struggle with aggressive behavior.

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Every year, about 500,000 U.S. citizens go to the emergency room because of a bicycling injury.

Bicycling is a popular activity and mode of transportation, but it also has the potential for accidents and injuries.

These injuries can range from minor scrapes to more severe outcomes, such as head trauma or broken bones.

The emergency room visits for such injuries highlight the importance of safety measures like wearing helmets, following traffic rules, and maintaining bicycles properly.

Summary: Annually, around 500,000 people in the U.S. end up in emergency rooms due to bicycling-related injuries, emphasizing the need for safety precautions while riding.

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One way to prevent incorporation of the HIV viral DNA into the host genome is to inhibit the viral reverse transcriptase enzyme.

This is because HIV is a retrovirus, which means it uses reverse transcriptase to convert its RNA genome into DNA that can then be integrated into the host cell's DNA. By inhibiting this enzyme, the virus is unable to complete this process and its DNA cannot be integrated into the host genome.

To explain in more detail, antiretroviral drugs are a class of medications used to treat HIV infection. There are several different types of antiretroviral drugs that work in different ways to inhibit the virus. One common strategy is to target the viral enzymes that are essential for the replication of the virus, such as the reverse transcriptase enzyme.

Reverse transcriptase is an enzyme that converts the viral RNA genome into DNA, which can then be integrated into the host cell's DNA. By inhibiting this enzyme, the virus is unable to complete this process and its DNA cannot be incorporated into the host genome. This prevents the virus from replicating and spreading to other cells.


In summary, inhibiting the viral reverse transcriptase enzyme is a key strategy for preventing the incorporation of HIV viral DNA into the host genome, and is a commonly used approach in antiretroviral therapy.

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The triploid food tissue in flowering plants that forms when the sperm fuses with two nuclei inside the female gametophyte to make a triploid cell is called endosperm tissue.

Endosperm tissue provides nourishment to the developing embryo and is a crucial component of many seeds.

The triploid food tissue in flowering plants that forms when the sperm fuses with two nuclei inside the female gametophyte to make a triploid cell is called endosperm.

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The triploid food tissue in flowering plants that forms when the sperm fuses with two nuclei inside the female gametophyte to make a triploid cell is called endosperm tissue.

The female gametophyte develops within the ovule

The endosperm tissue provides nourishment to the developing embryo and is a crucial component of many seeds.

The term "endosperm" refers to the triploid food tissue that develops in flowering plants when the sperm unites with two nuclei inside the female gametophyte to create a triploid cell.

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