a). Draw and label a simple diagram of the phospholipid bilayer consisting of multiple phospholipids, one transmembrane protein, one peripheral protein, and a few cholesterol molecules. b). Explain the orientation of the phospholipids. c). What is the purpose of the cholesterol in the membrane?
Answers
Multiple strategies exist for cholesterol to modify the bilayer structure of biological membranes. It modifies the lipid bilayers' fluidity, thickness, compressibility, water permeability, and intrinsic curvature.
Each phospholipid molecule has a head (polar area) that faces the bilayer's exterior. Each phospholipid molecule has a tail (nonpolar portion) that faces the bilayer's interior. The hydrophobic effect is the cause of this orientation.Phospholipids form a bilayer by positioning their heads inside the membrane and their tails toward the polar molecules of water solutions.
In between each phospholipid bilayer, there are pockets of cholesterol. The tails of the fatty acids may melt or freeze in the event of a temperature change. As the temperature rises, the phospholipid molecules have a tendency to spread apart, whereas at low temperatures, they prefer to move extremely closely together. This changes the fluidity of the membrane. disrupting the substance-transporting capacity of the membrane. The stabilising molecule known as cholesterol is what keeps phospholipids from moving excessively when the temperature changes.
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Related Questions
bacteria in the gi tract also produce ________.
Answers
Several vitamins are processed by gut bacteria using their enzymes. Vitamin K, a key cofactor in the formation of prothrombin and other blood clotting components, is synthesised by the gut microbiota.
It is Vitamin K2, a subunit of Vitamin K, which aids in the treatment of osteoporosis and is produced by bacteria found in the colon. These substances are deconjugated by intestinal bacterial enzymes such ß-glucuronidase, sulfatase, and other glycosidases, releasing the parent substances that are easily absorbed across the gut membrane. A large number of endogenous substances, such as bilirubin, bile acids, cholesterol, estrogens, and vitamin D metabolites, are circulated through the enterohepatic system. Additionally, a lot of medications that are eliminated by the liver enter this system, including digitalis, diethylstilbestrol, morphine, colchicine, rifampin, and chloramphenicol.
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Who is trying to save coral reefs?
Answers
Scientists are trying to save coral reefs.
The world’s coral reefs render a lot of service to the planet than providing the beauty underwater.
They buffer shorelines from the effects of hurricanes. An estimated 500 million people sustain their livelihoods from the fishing stocks and tourism opportunities reefs give. The animals that give rise to reefs are even offering hope for new drugs to manage cancer and other diseases.
But now, on World Oceans Day on June 8, scientists caution that these and other strategies may only get reefs time until world leaders implement climate change action.
Scientists around the world are looking for all kinds of ways to save and maybe even revive corals. One choice is to create marine protected areas—essentially national parks in the ocean. Scientists say creating marine refuges, where fishing, mining, and recreating are off-limits, makes the coral reefs healthier, and so more resilient.
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When an IRB is reviewing a research study and they are considering?
Answers
IRB is reviewing a research study and are considering if there a power differential between researchers and subjects.
Under FDA regulations, an Institutional Review Board is group that has been formally designated to review and cover biomedical exploration involving mortal subjects. The purpose of IRB review is to assure, both in advance and by periodic review, that applicable way are taken to cover the rights and weal of humans sharing as subjects in the exploration.
Research is what propels humanity forward. It's fueled by curiosity we get curious, ask questions, and immerse ourselves in discovering everything there's to know. literacy is thriving.
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How do you make a seed experiment?
Answers
Answer: Seed experiment needs the proper temperature , moisture, air and light conditions to germinate,
Explanation: soak the seeds overnight in water ,set a side the top of the petri dish , or open the CD case .cut the paper towel , lay the marked-up paper in the bottom of the dish ,so the line sits horizontally across the center ,pour a little water into the dish to wet the paper towel ,smooth out any bubbles and tip out any extra water not absorbed by the paper later , and then ,the wet paper should remain stuck to inside of the dish or CD case ,stretch the rubber band and set close to one another ,around the center and we should be careful observe whether the seeds are stick to the moistened paper towel and add seed for germination away from direct sunlight.
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List the significant events of the Krebs Cycle. Include which reactants and products are involved. Highlight what will be released as a product and what will move on to the next stage. Be sure to include where the process occurs in the mitochondria.
Answers
Answer:
The Krebs cycle, also known as the citric acid cycle or the tricarboxylic acid (TCA) cycle, is a series of chemical reactions that occur in the mitochondria of cells. These reactions are an important part of the process of cellular respiration, which produces energy for the cell.
The key events of the Krebs cycle include the following:
The conversion of acetyl-CoA to citrate by the enzyme citrate synthase. Acetyl-CoA is derived from the breakdown of glucose and other sugars, and citrate is the first intermediate product of the Krebs cycle.
The conversion of citrate to isocitrate by the enzyme aconitase. Isocitrate is the second intermediate of the Krebs cycle.
The conversion of isocitrate to α-ketoglutarate by the enzyme isocitrate dehydrogenase. α-ketoglutarate is the third intermediate of the Krebs cycle.
The conversion of α-ketoglutarate to succinyl-CoA by the enzyme α-ketoglutarate dehydrogenase. Succinyl-CoA is the fourth intermediate of the Krebs cycle.
The conversion of succinyl-CoA to succinate by the enzyme succinyl-CoA synthetase. Succinate is the fifth intermediate of the Krebs cycle.
The conversion of succinate to fumarate by the enzyme succinate dehydrogenase. Fumarate is the sixth intermediate of the Krebs cycle.
The conversion of fumarate to malate by the enzyme fumarase. Malate is the seventh and final intermediate of the Krebs cycle.
The conversion of malate to oxaloacetate by the enzyme malate dehydrogenase. Oxaloacetate is the starting material for the next round of the Krebs cycle.
As the Krebs cycle progresses, electrons are transferred from the intermediates to NADH and FADH2, which are electron carriers. These carriers then transfer the electrons to the electron transport chain, where they are used to produce ATP, the energy-carrying molecule used by cells. The end products of the Krebs cycle are carbon dioxide and water.
Explanation:
Two horses are crossed. One has a dark brown coat, and the other has a cream coat.
The offspring is dappled and has splotches of both dark brown and cream.
What type of dominance does this indicate?
Co-dominance
Incomplete dominance
Complete dominance
Mutation
Answers
Answer:co-dominance
Explanation:
neither trait is stronger so the foal displays both colors
How many mutations can cause cystic fibrosis?
Answers
All people have two copies of the CFTR gene, and there must be mutations in both copies to cause CF. More than 1,700 mutations of the CFTR gene have been identified.
What are the functions of CFTR gene?The cystic fibrosis transmembrane conductance regulator (CFTR) protein helps to maintain the balance of salt and water on many surfaces in the body, such as the surface of the lung.
This mutation is caused by the deletion of three base pairs of the CFTR gene leading to the loss of an amino acid called phenylalanine, abbreviated F, in the CFTR protein.
In cystic fibrosis, a defect (mutation) in a gene — the cystic fibrosis transmembrane conductance regulator (CFTR) gene — changes a protein that regulates the movement of salt in and out of cells.
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How can sweating be beneficial to an animal in a hot environment?
Answers
Answer:
Sweating helps animals cool because drying sweat cools the skin. Some canines—members of the dog family—sweat from their feet, but that is not a large enough surface area to cool the whole animal.Explanation:
9. Predict the consequences of the failure or absence of an organelle inside a eukaryotic cell. What would happen if a cell did not have the following organelles: mitochondria, ribosomes, chloroplasts. List 1 other organelle and explain what would happen if a cell did not have that organelle.
Answers
Answer:
The failure or absence of an organelle inside a eukaryotic cell can have a variety of consequences, depending on the specific organelle and the cell type.
If a cell did not have mitochondria, it would be unable to produce ATP through cellular respiration, which would severely impair its ability to perform essential cellular functions such as growth, division, and maintenance.
If a cell did not have ribosomes, it would be unable to produce proteins, which are essential for many functions such as enzyme catalysis, structural support, and signaling.
If a cell did not have chloroplasts, it would be unable to perform photosynthesis and would be unable to produce its own energy from sunlight. This would be particularly problematic for plant cells, which rely on photosynthesis as their primary source of energy.
One other organelle that is essential for the function of eukaryotic cells is the nucleus. The nucleus is the cellular compartment that houses the genetic material of the cell, and it is responsible for the regulation of gene expression and the coordination of cell growth and division. If a cell did not have a nucleus, it would be unable to properly control its own growth and division, and it would be unable to pass on its genetic information to its offspring. This would severely impair the cell's ability to survive and reproduce.
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Explanation:
What is the formula for population distribution?
Answers
Population Density is therefore equal to the number of inhabitants divided by the land area. Land area should be measured in square miles or square kilometers.
What is the demographic breakdown?The spatial pattern caused by population dispersion, agglomeration formation, linear spread, etc. is referred to as population distribution. The number of people per unit area is known as population density. It demonstrates the connection between a population's size and the area in which it resides.
Which formula governs population?Population after n years equals P x (1+R/100)n if growth is constant at R% per year. 3. If the population is declining at a constant rate of R% annually, the population after n years will be equal to P x (1-R/100)n.
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Which of the following is NOT produced by meiosis?
a. an egg, or ovum
b. a liver cell
c. a sperm cell
d. All of the given choices are produced by meiosis.
Answers
The process of meiosis does NOT result in which of the following liver cells
Cell division known as meiosis results in the production of four gamete cells and a halving of the parent cell's chromosome count. Sperm and egg cells must be created throughout this phase in order to reproduce sexually. In asexual reproduction, meiosis does not take place. Gametes are created during meiosis, a process (eggs and sperm). Cell division is all that occurs during mitosis, but at the other hand. Meiosis, also known as reduction division, is the process by which a germ cell divides into four zygotes, or sperm cell, each of which has half as many chromosome as the parent cell and is produced by two nuclear fission reactions of the nuclear.
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In Drosophila, the ratio of X chromosomes to autosomes directly influences _______. a. the ratio of sisterless protein subunits to deadpan protein subunits b. SXL late protein production c. RNA splicing patterns d. repression of sex-specific genes
Answers
In Drosophila, the ratio of X chromosomes to autosomes directly influences option a. the ratio of sisterless protein subunits to deadpan protein subunits.
Drosophila melanogaster, known colloquially as the fruit fly, remains one of the most generally used model organisms for biomedical wisdom. For further than one hundred times, the low cost, rapid-fire generation time, and excellent inheritable tools have made the cover necessary for introductory exploration.
Protein makes up the enzymes that power numerous chemical responses and the hemoglobin that carries oxygen in your blood. One of the deadpan-neural genes is impassive, which encodes a helix- circle- helix protein nearly related to the product of the segmentation gene hairy.
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explain how this arrangement allows chloroplasts to generate a larger proton gradient across the thylakoid membrane than mitochondria can generate across the inner membrane.
Answers
Because chloroplasts have smaller compartments where hydrogen ions are pumped, they create a bigger proton gradient across the thylakoid membrane than mitochondria can across the inner membrane.
The light-induced -proton gradient is required for ATP production across thylakoid membranes. Proton pumping into the thylakoid lumen results in an alkaline stromal pH, which is essential for complete activation of pH-dependent Calvin Benson cycle enzymes.
The chemiosmotic theory describes how ATP is created in chloroplasts. ATP production is connected to the formation of a proton gradient across the membrane of the chloroplast thylakoid, with proton buildup occurring on the inside of the membrane, in the lumen.
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How does cardiovascular endurance prevent injury?
Answers
Cardiovascular endurance includes strength training that improves the body alignment. Strength training includes fluid movements that promote excellent body alignment, hence reducing injury risk.
How does muscular endurance prevent injury?Improving cardiovascular endurance can make it easier to carry out your daily tasks. When one increases stamina, that means increasing your ability to maintain correct form and balance. Hence, you decrease weaknesses that can lead to injury.
Physical fitness can reduce the risk for and resilience to accidental injuries. For example, stronger muscles and better balance means that one is less likely to slip and fall. Stronger bones means that you are less likely to suffer bone injuries should you take a tumble.
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A placenta is associated with a(n):
Answers
Answer:
A placenta is associated with pregnancy and childbirth. The placenta is an organ that develops in the uterus during pregnancy and provides nutrients and oxygen to the growing fetus. It is also responsible for removing waste products from the fetal bloodstream. The placenta is typically delivered from the mother's body along with the baby during the birthing process.
It provides oxygen and nutrients to a growing baby’s
What is the main idea of the story rescuing our reefs?
Answers
The main idea of the rescuing our reefs is that the coral reef's vegetation and animals rely on one another to thrive.
Reef corals help maintain a healthy ocean food chain, defend our coastlines, and reef's vegetation as habitat for a wide variety of marine creatures.
Coral polyps build the enormous limestone structures known as coral reefs. Coral reefs, also known as the "rainforests of the sea," are home to about 25% of all marine species known to exist.
The undersea environment known as a coral reef is defined by the corals that construct reefs. Reefs are created by coral polyp colonies connected by calcium carbonate. Stony corals, whose polyps cluster, make up the majority of coral reefs.
Coral reefs support local economies, give recreational activities, and shield coasts from erosion and storm damage. They are a source of both fresh food and pharmaceuticals. Reefs are essential to the survival, way of life, and food security of more than 500 million people.
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Correctly label the following anatomical features of the lymph node. Cortical sinus Germinal center Lymphatic nodule Afferent lymphatic vessels Efferent lymphatic vessel Medullary cord Efferent lymphatic vessel Medullary sinus Afferent lymphatic vessels
Answers
In the following figure anatomical features of the lymph node, it is labeled against the number marked:
Lymphatic nodulesGerminal centerCortical sinusMedullary sinusMedullary cordComplete answer in the picture.
Lymphatic nodules: These are small, localized collections of lymphoid tissue. They are usually located in the loose connective tissue beneath wet epithelial (covering or lining) membranes, as in the digestive system, respiratory system, urinary bladder, etc.
Germinal center: They are transiently formed structures within the B cell zone (follicles) in secondary lymphoid organs – lymph nodes, ileal Peyer's patches, and the spleen Here the mature B cells proliferate, differentiate, and mutate their antibody genes
Cortical sinus: Lymph flows from afferent lymphatic vessels, into a space underneath the capsule called the subcapsular sinus, then into cortical sinuses.
Medullary sinus: After passing through the cortex, lymph then collects in the medullary sinuses
Medullary cord: It's a portion of the medulla of the lymph node which contains lymphatic tissue and project into the medullary sinus. B cells and plasma cells are the main cell types found in the medullary cords.
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What is atherosclerosis also called?
Answers
Fat, cholesterol, and other chemicals accumulate in the artery walls, causing atherosclerosis, often known as "hardening of the arteries." Plaques are what we name these deposits.
These plaques can constrict or even block the arteries over time, leading to issues throughout the body. A common disease called atherosclerosis arises when a sticky material called plaque accumulates within your artery. The most common reason for mortality in the US is a condition related to atherosclerosis.
High blood pressure: Over time, high blood pressure can harm the lining of the arteries, causing plaque to accumulate. Diabetes: High blood sugar levels can harm the arteries' inner layers and lead to the formation of plaque. High blood cholesterol and triglyceride levels raise your chances of developing the metabolic syndrome.
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39) which of the following represents the order of increasingly higher levels of organization of chromatin? a) nucleosome, 30-nm chromatin fiber, looped domain b) looped domain, 30-nm chromatin fiber, nucleosome c) looped domain, nucleosome, 30-nm chromatin fiber d) nucleosome, looped domain, 30-nm chromatin fiber e) 30-nm chromatin fiber, nucleosome, looped domain
Answers
the following represents the order of increasingly higher levels of organization of chromatin : nucleosome, 30nm chromatin fiber, looped domain.
Chromatin is a DNA and protein mixture that forms the chromosomes discovered in the cells of humans as well as other higher organisms. Many proteins, specifically histones, package the humongous quantity of DNA in a genome into an extremely compact form that can fit inside the cell nucleus.
Because of its staining properties, the complex of DNA and protein is known as chromatin (from the Greek chroma, "color"). In addition to the proteins involved in DNA packaging, chromosomes are associated with numerous proteins required for gene expression, DNA replication, and DNA repair.
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What is the effect of crossing 2 purple flowered heterozygous parents on the resulting genotypes of the offspring?
Answers
If both purple flowered are heterozygous (Ww), there is a 75% chance that any one of their offspring will have a widow's peak.
Punnett square can be utilized to determine all genotypic combinations that exist in the parents. There are a few key differences in a pedigree which depict a common inherited trait. Given that there are only two alleles again for trait, the organism can express two distinct phenotypes. A Punnett square shows that two heterozygous organisms will produce a progeny with 75% of the dominant phenotype.
Half of the offspring will be heterozygous, while the other half would be homozygous. The genotype of an offspring is determined by the combination of genes inside the sex cells as well as gametes (sperm as well as ova) that came together during conception. Each parent contributed one sex cell. Sex cells normally have only one copy of each trait's gene.
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Which is the correct order of protein synthesis from transcription to translation?
Answers
The correct order of protein synthesis from transcription to translation is DNA > mRNA > chains of amino acids > protein.
Protein synthesis is a process within which the cells make proteins. It occurs in two stages recap and paraphrase. Recap is the transfer of heritable instructions in DNA to mRNA in the nexus. It includes three way induction, extension, and termination.
DNA is the information patch. It stores instructions for making other large motes, called proteins. These instructions are stored within the cells, and than distributed among chromosomes. These chromosomes are made up of thousands of shorter corridor of DNA, called genes.
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Who does Napoleon represent in the Russian Revolution?
Answers
Joseph Stalin, the Soviet leader, served as the representation for Napoleon in the Russian revolution.
Stalin participated in the 1917 Russian Revolution and took control of Soviet Russia in 1924 after Vladimir Lenin's passing. Napoleon is a reference for Joseph Stalin since both men were driven by fear. Squealer is a euphemism for the Russian media, which propagandised on behalf of Stalin. Animal Farm is a symbolism for the 1917 Russian Revolution. Boxer is a depiction of all Russian labourers and workers, while Old Major stands in for Karl Marx, Snowball for Leon Trotsky, Napoleon for Josef Stalin, Squealer for propaganda, and Snowball for Leon Trotsky.
Napoleon supported the Revolution by establishing the lycée system of schools for universal education, constructing numerous universities, and enacting new civic laws that offered the French a great deal more freedom than they had under the Monarchy.
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What contains the bases adenine thymine guanine and cytosine?
Answers
The bases in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T) (T). These bases are available in specific pairs (A with T, and G with C).
The chemistry of nitrogenous bases is what determines how DNA works. It permits a process known as complementary base pairing. Cytosine, for example, can establish three hydrogen bonds with guanine and two hydrogen bonds with thymine. Alternatively, to put it simply, C bonds with G, and A bonds with T. It's called complementary base pairing since each base can only bond with one other base. Similar to a lock and a key, the structures work best together. In DNA, C only bonds with G, and A only bonds with T. The hydrogen-bonded nitrogenous bases are sometimes referred to as base pairs due to complementary base pairing.
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What is biology in society?
Answers
The goal of Biology in Society is to provide students with a solid theoretical and practical understanding of genetics and developmental biology, evolution, reproduction, and physiology, of animals and plants, and their societal relevance.
What function does biology serve in modern society?The study of life in science is known as biology. It is a natural science with a wide range, yet it has a number of common threads that make it work as a single, cohesive field. all species that process genetically encoded information that can be passed on to future generations.
What does biology in society class entail?In the multidisciplinary major of "Biology & Society," students can study both the biological sciences and the social and ethical ramifications of contemporary biology.
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What is 1 significant issue with many genetically modified organisms?
Answers
The 1 significant issue with many genetically modified organisms is antibiotic resistance.
A genetically modified organism (GMO) is indeed a living organism whose DNA has been changed in a laboratory to encourage the expression of wanted physiological traits or the manufacturing of desired biological products.
Genetically modified organisms benefit both producers and consumers (GMOs). For example, genetically modified plants may help protect crops by conferring resistance to the a specific disease but rather insect, resulting in greater food production. GMOs can also be used as a source of medicine.
There have been concerns about unintended consequences, including the creation of food that may trigger an allergic reaction, GMOs that really can cause harmful genetic effects, as well as genes that are not genetically engineered moving from one species to another. The advantages of using GMOs include higher harvest yields, which can feed more people around the world, and making food more nutritious. The risks of using GMOs include both the unknown long-term risks of eating GMO crops and the negative environmental effects that they can have.
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explain the connection between variation in the number and types of molecules wihthin cells to the ability of the organism to survive and or reproduce in different environments
Answers
Molecules are the fundamental building blocks of life. Every living organism is composed of various types and amounts of molecules, and the number and types of molecules within cells are essential for the organism to survive and reproduce in different environments.
Molecules are composed of atoms, which are the smallest particles of matter that can interact with one another. The types of atoms that make up molecules can vary, as can the amount of each type of atom in a given molecule. For example, the molecule water is composed of two hydrogen atoms and one oxygen atom.
This basic molecular structure is essential for the survival of many organisms, as water is necessary for hydration and to transport nutrients through the body. Other molecules, such as proteins, carbohydrates, and lipids, are also essential for life. Each of these molecules is composed of different types and amounts of atoms, and the number and types of molecules present in the cells of an organism can vary depending on the environment the organism is in.
The ability of an organism to survive and reproduce in different environments is directly related to the number and types of molecules within its cells. For example, when organisms move from one environment to another, their cells may need to adapt by producing more of some molecules and less of others.
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DO.
Description and Function
flat, irregularly shaped cells that make up the top
and bottom layers of leaves
layer that.
on the lower epidermal
move through
internal cells packed together to expose the
greatest number to
inside the Orde
the
where photosynthesis occurs
Answers
Note that the description above references the structure of the leaves of a plant where the top and bottom layers of leaves are called the epidermis.
How can we further describe the epidermis?The cells in the epidermis are flat and irregularly shaped, and they help to protect the plant and regulate water loss. The epidermis is located on the leaf's outer surface and comprises a single layer of cells.
Below the epidermis, there are internal cells that are packed together in layers. These cells are called mesophyll and contain chloroplasts, the organelles responsible for photosynthesis. The chloroplasts are located in the mesophyll cells, which are found in the middle of the leaf. The mesophyll cells are arranged in a way that exposes the most significant number of chloroplasts to light, which is necessary for photosynthesis to occur.
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Hello! Please help me!
I have a test tomorrow so this is urgent!!!
Question: Look at the data in the photograph.
At the end of the period of exercise, how much faster is the heart rate of the untrained person than the trained person?
Answers
Answer:
Explanation:
since the y axis (the heart rate) is counting by 4s the trained heart beat seems to be 64 bpm while the untrained is 80 bpm
to find out the difference you would subtract 64 from 80 to get 16 so the difference would be 16 b.m.p after 23 minutes
What are the stages of meiosis 2 in order?
Answers
1st, Prophase ll: Chromosomes condense and the nuclear envelope breaks down if needed. The centrosomes move apart, the spindle forms between them, and the spindle microtubules begin to capture chromosomes.
2nd, Metaphase ll: The paired chromosomes line up.
3rd, Anaphase ll: The chromatids split at the centromere and migrate along the spindle fibers to opposite poles.
4th, Telophase ll and Cytokinesis: The cells pinch in the center and divide again, creating two daughter cells.
Go online or look up phlogiston and ectoplasm. These are two substances that were once widely considered to be actual, but have not been observed for a long time. What happened to them? Are there "different kinds of truth"? Can something be true because it "feels true", even in the absence of evidence?
Answers
Ectoplasm is a strange, typically light-colored, viscous fluid that is supposed to emanate from a spiritualist medium's body when they are in a trance and can take the form of a face, a hand, or an entire body.
What are the phlogiston and ectoplasm?Phlogiston was a mythical fire force that permeated early chemistry theory and was a component of every flammable substance. According to this theory, phlogiston was released to cause the phenomenon of burning, which is now known as oxidation, and the dephlogisticated substance was left behind as an ash or residue.
Therefore, a fictitious substance that was once believed to exist in all flammable materials and to be emitted upon combustion.
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