Answer: two diploid cells two diploid cells
Explanation:
There are two types of division, mitosis (equational = each parent cell produces two daughter cells genetically identical) and meiosis (reductive = each mother cell produces four daughter cells with half the number of chromosomes). Mitosis is divided into steps:
Interphase: The chromatin filaments duplicate;
Prophase: At this stage, the chromosomes begin to become visible due to spiraling; The nucleoli begin to disappear; The centrioles begin to spindle fibers that will help in cell division. The core absorbs water, swells, and clutters the nuclear membrane.
Metaphase: The chromosomes are very visible as they reach the maximum of spiraling; The chromosomes attach to the spindle fibers in the equatorial region of the cell next to each other;
Anaphase: The spindle fibers begin to shorten, and as a result, each filament is pulled to the cell poles.
Telophase: The chromosomes begin to spiral out; The nucleoli and the nuclear membrane begin to appear, And the centrioles are already located in pairs in each daughter cell.
Cytokinesis: It is the breakdown of the cell in two. In animals, it occurs from the outside in (centripetal) and in vegetables from the inside to outside (centrifuge).
Answer:
two diploid cells
Explanation:
The molecular weight of salt (NaCl) is 58 g/mole. The recommended daily salt intake is less than 2.3 g. The average volume of blood in human body is 6 liters. What is the molar concentration of 2.3 g NaCl glucose in 6 liters of solution?
Answer-
The molar concentration of [tex]2.3[/tex] g NaCl glucose in [tex]6[/tex] liters of solution is [tex]0.0066[/tex]moles/litre
Explanation:
Molarity is the number of moles of a substance in a unit volume of solution. Molarity is known as molar concentration and its unit is [tex]\frac{mole}{l} \\[/tex]
Number of moles in [tex]2.3[/tex] grams of NaCL
[tex] = \frac{2.3}{58} \\= 0.039[/tex]
Molar concentration
[tex] = \frac{0.0396}{6} \\= 0.0066\\[/tex] moles/litre
Hence, the molar concentration of [tex]2.3[/tex] g NaCl glucose in [tex]6[/tex] liters of solution is [tex]0.0066[/tex]moles/litre
While Sandy was engaging in sexual activity with her significant other, she noticed rhythmic muscle contractions and a period of time in which she felt that immense tension was released. Sandy likely just experienced the _____, which is a component of the sexual response cycle.
Answer:
The correct answer is orgasm.
Explanation:
Sexual response cycle is a 4 stage process of responses to sexual stimulation. The four stages are -the very first stage is the excitement phase, following by the plateau phase, the third stage is the orgasmic phase and in the last resolution phase.
During orgasm phase muscle contraction occurs in the lower pelvic muscles. Women experience vaginal contractions and uterine contraction. Orgasms are also included muscular spasms in the body and generally feels like releasing immense tension.
Thus, the correct answer is orgasm.
In a large herd of 5468 sheep, 76 animals have yellow fat, compared with the rest of the members of the herd, which have white fat. Yellow fat is inherited as a recessive trait. This herd is assumed to be in Hardy-Weinberg equilibrium. a. What are the frequencies of the white and yellow fat alleles in this population?
Answer:
The Hardy-Weinberg equation is written as p²+q²+2pq = 1 and p + q =1
where,
p² is the frequency of homozygous dominant (BB)
q² is the frequency of homozygous recessive (bb)
2pq is the frequency of heterozygous (Bb)
p is the frequency of dominant allele (B)
q is the frequency of recessive allele (b)
As per given details, the number of homozygous recessive organisms in a population is 76.
Total population size is 5468
Thus, the frequency of homozygous recessive (q²) = [tex]\frac{76}{5468}[/tex]
⇒ q² = 0.014
⇒q = [tex]\sqrt{0.014}[/tex]
⇒q = 0.118
∴ p = 1 - 0.118
⇒p = 0.882
thus, the frequency of yellow fat allele is 0.118 and that of white fat allele is 0.882
28. What specific adaptation has the sub-type of CAM plants derived to reduce the amount of water lost in dry environments?
a. Stomata open at Night
c. Central Vacuoles
b. Guard cells
d. Chloroplasts
Answer: a. Stomata open at Night
Explanation:
As a tactic to minimize photorespiration in warm regions, many water-storing plants such as cacti and pineapples modified its method of carbon fixation. This process is called Crassulacean Acid Metabolism (CAM), following the plant family Crassulaceae, in which it was first identified. In these plants, the stomata (singular, stoma), specialized openings in the leaves of all plants through which CO2 enters and water vapor is lost, open during the night and close during the day. This model of stomatal opening and closing is the opposite of that in most plants.
The primary visual cortex is located in the
The primary visual cortex, which plays a critical role in processing visual information, is located in the occipital lobe at the back of the brain.
Explanation:The primary visual cortex, also known as V1, is a part of your brain that is responsible for processing visual information. It is located in the occipital lobe, which is at the back of your brain. Processing visual information means that this part of the brain works to interpret details like color, shape, and motion from the visual signals that your eyes send. In essence, the primary visual cortex allows us to understand what we're seeing.
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The primary visual cortex, responsible for interpreting incoming visual information, is located in the occipital lobe at the back of the brain. Further processing of visual data happens in surrounding areas and is then sent to regions of the temporal and parietal lobes via the ventral and dorsal streams.
Explanation:The primary visual cortex is located in the occipital lobe at the back of the brain. This area, denoted as V1, is essential for our vision as it interprets incoming visual information. Encircling the primary visual cortex are areas V2 and V3, also known as the visual association cortex. These regions enhance our visual perceptions by incorporating color and motion data.
The processed information is then forwarded to the regions of the temporal and parietal lobes through two principal streams of processing: the ventral and the dorsal. The ventral stream identifies visual stimuli and their significance, while the dorsal stream helps locate objects in space and support body movement responses to visual inputs. This intricate process facilitates our interaction with the visual world around us.
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Name the organs in the digestive system where there are stratified epithelia.
Answer: Mouth cavity, pharynx, esophagus and anus.
Explanation:
The stratified epithelium tissues are the type of epithelium tissues that are responsible for providing covering and lining to the body parts. The cells in these tissues are flat, they are joined together and appear in stack form.
The major function of these tissues is the providing protection to the body organs against wear and tear. These are found in the lining of the organs of the digestive system such as mouth cavity, pharynx, esophagus and anus.
Which of the following statements are true?
a) Operons control the activity of an enzyme
b) operons control of the synsthesis of an enzyme
c) Both operons and feedback inhibition control the synthesis of an emzyme
d) Operons can induce or imate enzyme synthesis but can not repress enzyme synthesis
Answer:
C
Explanation:
The operon is a constitution of genes transcribed together – hence developing a functional element to the cell -and have an operator and regulatory gene within it. The activity of the operon is regulated by a positive and negative feedback mechanism that is a response to the cells environment. An activator or a repressor molecule activates or represses, respectively, the transcription of the operon.
The best reason for categorizing two species into the same genus would be because they have _______. overlapping ranges a common ancestor behavioral similarities physical similarities
Answer: B. a common ancestor
Explanation: The closest they can be related before being the same species is genus. According to theory of evolution, they have a close common ancestor.
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What are some of the general functions of skin?
The white matter of the spinal cord contains
The white matter of the spinal cord contains myelinated axons that form ascending and descending tracts for transmitting sensory and motor information between the brain and the body.
Explanation:The white matter of the spinal cord is primarily composed of myelinated axons of neurons. These axons are wrapped in a myelin sheath which is high in lipid content, giving the tissue its white appearance. The spinal cord's white matter is organized into white columns: the posterior, anterior, and lateral columns. The ascending tracts in these columns carry sensory information from the body to the brain, while the descending tracts carry motor commands from the brain to the muscles and organs throughout the body.
These myelinated axons facilitate the rapid transmission of nerve impulses between the brain and different parts of the body, allowing for efficient communication and control of bodily functions. They form crucial pathways by which the central nervous system (CNS) interacts with the peripheral nervous system (PNS).
What is peristalsis in the digestive system?
The kidneys are able to perform their homeostatic functions reasonably well as long as at least _______ of the nephrons are functioning normally. If fewer nephrons are functioning, _______ , or toxic buildup of waste products in the blood, is possible.
Answer:
10% and Uremia
Explanation:
The kidneys are able to perform their homeostatic functions reasonably well as long as at least 10% of the nephrons are functioning normally. If fewer nephrons are functioning, uremia , or toxic buildup of waste products in the blood, is possible.
The kidneys can perform homeostatic functions well as long as at least 20% of the nephron are functioning normally. If nephrons function less, uremia or a buildup of toxic waste products in the blood can occur.
Further explanation
The kidneys are excretory organs invertebrates that are shaped like peanuts. In adult humans, the kidney is about 11 cm. The kidneys receive blood from a pair of renal arteries, and blood comes out through the renal vein. The kidneys are connected to the ureter, where the ureter carries urine out to the bladder.
As part of the urine system, the kidneys function to filter impurities (especially urea) from the blood and dispose of them together with water in the form of urine.
One part of the kidney is the nephron, the nephron itself is the smallest part of the kidney which is composed of the proximal tubule, distal tubule, and ductal kologentes. It is in this nephron where blood filtering occurs and a very important part of the kidneys which is also part of the human excretion system because it secretes urine.
Functions of nephrons include:
Blood filtration. This process is also called filtering and is carried out on the glomerulus. Reabsorption. The process is re-absorption and is carried out in the proximal consortium Tribulus. Excessive secretion of substances or not used by the body. This process is augmentation and is carried out in the distal tubular contour. It has the main function in the excretion of urine. As a regulator of substances and fluid levels in the body Break down red blood cells to produce nitrogen waste. Forming urea from protein metabolic waste products As a regulator of blood chemical composition.Uremia itself is a syndrome or a collection of symptoms of serious complications from chronic kidney disease and kidney failure. This can occur when urea levels in the body are high so that it can cause toxins to the body. Uremia occurs because the kidneys cannot function properly. Uremia can be fatal and life-threatening.
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Details
Class: College
Subject: Biology
Keyword: Function of nephrons in kidneys.
In humans, oculocutaneous (OCA) albinism is a collection of autosomal recessive disorders characterized by an absence of the pigment melanin in skin, hair, and eyes. That is, normal pigmentation (A) is dominant over albino characteristics (a). For this question, assume it is a single gene with two alleles. If both parents display the albino phenotype, what are all of the possible genotypes that may be observed in their offspring?
Answer 1:2:1
Explanation:1AA:2Aa:1aa using punnette square
Answer:
1:2:1
Explanation:
For intramembranous ossification to take place, which of the following is necessary?
A) An ossification center forms in the fibrous connective tissue.
B) A medullary cavity forms.
C) A bone collar forms around the cartilage model.
D) The cartilage matrix begins to deteriorate.
Answer:
An ossification center forms in the fibrous connective tissue.
Explanation:
Intramembranous ossification is an important process of formation of bone from the fibrous membrane. This process occur during the the fetal development.
Mesenchyme stem cell in the meduallry cavity starts the process of intramembranous ossification. The important process during intramembranous ossification is the formation of ossification center in the fibrous connective tissue.
Thus, the correct answer is option (A).
For intramembranous ossification, an ossification center forms in the fibrous connective tissue. This is crucial for the development of specific flat bones. Option A is correct .
Intramembranous ossification is the process where bone develops directly from sheets of mesenchymal connective tissue.
Mesenchymal cells cluster together and differentiate into osteoblasts, forming an ossification center. The osteoblasts secrete osteoid, a substance that hardens to become bone matrix. The newly formed bone matrix then traps osteoblasts, which become osteocytes. This process is crucial for the development of the flat bones of the skull, the mandible, and the clavicles.Other options, like the formation of a medullary cavity, a bone collar around a cartilage model, or the deterioration of the cartilage matrix, pertain to endochondral ossification rather than intramembranous ossification.
Which amino acid residues are phosphorylated by kinases?
Serine, threonine, and tyrosine are most commonly phosphorylated in eukaryotes.
The amino acid residues phosphorylated by kinases are serine, threonine, and tyrosine. These residues contain hydroxyl groups that allow the binding of a phosphate group, altering the protein's structure and function.
The amino acid residues that are commonly phosphorylated by kinases are serine, threonine, and tyrosine. These amino acids have side chains with hydroxyl groups (-OH) which provide the necessary chemical handle for the attachment of a phosphate group (PO₄³⁻). During the process of phosphorylation, a phosphate group from ATP (adenosine triphosphate) is transferred to these hydroxyl groups, often resulting in a structural change that can activate or deactivate the protein's function. Phosphorylation is a crucial mechanism for regulating the biological activity of proteins within cells, serving as a switch in various cell signaling pathways.
For instance, serine can be found in consensus sequences such as the hydrophobic/aromatic motif FLGFSYA, which is conserved in AGC kinases. The phosphorylation of serine residues is frequently referred to as phosphoserine. Phosphorylation of threonine and tyrosine occurs similarly, affecting the protein functionality depending on the position and context within the protein structure.
Where does the right ventricle send blood?
The right ventricle pumps the blood to the lungs.
The right ventricle pumps blood through the pulmonary valve, the pulmonary artery and it's last stop is to deliver it to the lungs.
What are some examples of the sympathetic and parasympathetic systems of the brain?
Answer:
Example of sympathetic nervous system:
Sympathetic nervous system regulates the functioning of body during fight and flight response. The example of sympathetic system of brain are increase rate of heart beat, dilation of blood vessels, erection inhibition and loss of hearing. During excitement, emotion and fear the sympathetic nervous system is active.
Example of parasympathetic nervous system:
Parasympathetic nervous system of the brain controls the body function during rest. This system bring the body at normal state after intense fear or excitement. The example of sympathetic system of brain are normal heart beat, constriction of blood vessel and normal erection.
Which of the following is true of carbon dioxide exchange? Select one: a. Carbon dioxide is produced in the mitochondria and cytoplasm of every living cell during respiration b. Carbon dioxide diffuses from cells into the blood plasma before entering erythrocytes. c. Carbonic acid is able to ionize and release protons into its environment, which has an effect of raising the pH. d. Hemoglobin helps maintain a constant pH in the blood by binding with H* ions released from bicarbonate ions.
Answer:
d. Hemoglobin helps maintain a constant pH in the blood by binding with H⁺ions released from bicarbonate ions.
Explanation:
The presence (CO₂) in in the erythrocytes lowers its pH as a result the affinity of hemoglobin decreases for oxygen. The carbon dioxide (CO₂) reacts with water to form carbonic acid in the presence of the enzyme carbonic anhydrase which is present in the erythrocytes or red blood cells. The carbonic acid then changes into two ions hydrogen ion (H⁺) and bicarbonate ion (HCO₃⁻). As a result of H⁺ ions, the pH of blood drops. Haemoglobin pick up hydrogen ions to balance the decrease in pH. Thus, haemoglobin helps in maintaining constant pH or keep pH of blood in buffer.
True or False. The green revolution is the development of high-yield varieties of crops and the use of modern cultivation methods, including the use of farm machinery, fertilizers, pesticides, and irrigation.
Answer:
True
Explanation:
The green revolution started in 1960s and it introduced the following into the agricultural system -
a) High yielding varieties of seed
b) Efficient irrigation practices
c) Use of specific fertilizers
d) Introduction to use of pesticides/weedicides to protect the crop
e) Enhancement of commercial farming through use of modern equipment's such as tractor, drills , harvester etc.
Hence, the given statement is true.
Answer:
The answer is D, or the use of irrigation, fertilizers, and high-yield crops to increase output.
Explanation:
The green revolution attempted to increase agricultural yield and output as a means of reducing hunger. Hope you have a good day, and thanking you for being alive <3 :)
What is the most abundant of the four major bioorganic molecules found in natural steroid hormones & cell plasma membranes? a. Lipids/Fatty Acids c. Nucleic Acids b. Amino Acids d. Polysaccharides
Answer: a. Lipids/Fatty Acids
Explanation:
Cells are packed with and surrounded by water, the structure of cell membranes is defined by the way membrane lipids perform in a watery (aqueous) environment. The lipid bilayer constitutes the primary structure of all cell membranes. The lipids in cell membranes combine two properties in a single molecule: each lipid has a hydrophilic (“water-soluble”) head and a hydrophobic (“water-insoluble”) tail.
Mitochondria and chloroplasts resemble bacteria in that they a. have their own DNA. b. have their own ribosomes. c. reproduce by simple division into two. d. All of the above
Answer:
its D, all are correct
Explanation:
Mitochondria and chloroplasts resemble bacteria as they have their own circular DNA, replicate through a process resembling bacterial binary fission, and possess ribosomes similar to those of bacteria, all supporting the endosymbiotic theory. Hence, the correct option is d.
Mitochondria and chloroplasts resemble bacteria in that they have their own DNA, have their own ribosomes, and reproduce by simple division into two. These organelles share several distinct similarities with bacteria that support the endosymbiotic theory, which suggests that they were once free-living prokaryotes that were engulfed by ancestral eukaryotic cells.
Both organelles contain DNA that is circular, not linear, which is a characteristic feature of bacterial chromosomes. Furthermore, both mitochondria and chloroplasts replicate independently from the cell via a process similar to binary fission, a method used by bacteria to reproduce. Their ribosomes also resemble the 70S ribosomes found in bacteria, rather than the 80S ribosomes typical in eukaryotic cells' cytoplasm.
The evidence supporting these similarities includes the size and structural features of these organelles, their lipid and protein composition, and particularly their genetic material which places them phylogenetically alongside bacteria. This evidence has led to the widely accepted endosymbiotic theory, explaining the origin of mitochondria and chloroplasts within eukaryotic cells.
4. In a chi-square test, the O in the equation represents _______________
the degrees of freedom
the chi square value
type O blood
observed percentages
the number of individuals observed in a specific category
Answer:
The correct answer is: observed percentages
Explanation:
As we know the chi-square test has to do with a test statistic in which there is a measurement of the divergence of the observed data from the values that are expected under the null hypothesis of no association. And the O stands for the observed outcomes.
Final answer:
In a chi-square test, 'O' stands for the observed values. For a test of homogeneity in a five-by-two table, the degrees of freedom would be 4. In a test of independence, degrees of freedom are calculated as the product of one less than the number of rows and one less than the number of columns.
Explanation:
In a chi-square test, the O represents the observed values (data), which are the actual counts or frequencies measured in the study. These observed values are compared against the expected values (E), which are the counts or frequencies that would be expected under the null hypothesis.
When conducting a chi-square test of homogeneity for data in a five-by-two table, we calculate the degrees of freedom (d) as:
d = (number of rows - 1)(number of columns - 1)So, d = (5 - 1)(2 - 1) = 4(1) = 4.Test of Independence:
The number of degrees of freedom for the test of independence is similarly calculated as:d = (number of rows - 1)(number of columns - 1).For a hypothetical cell phone ownership table with freshmen and seniors, if we assume there are two rows and three columns, the degrees of freedom would be calculated as:
d = (2 - 1)(3 - 1) = 1(2) = 2.
List two medications that are helpful in treating hypertension and describe their actions.
Answer: Diuretics and beta-blockers
Explanation:
Hypertension is a condition in which high blood pressure occurs. In this condition the pressure of the blood inside the arteries is severely elevated. The blood exerts force on the walls of the arteries.
Following are the medications which can be used for the treatment of high blood pressure.
1. Diuretics: These medicines helps to reduce the excess level of sodium and water and hence it regulates the blood pressure. It is used along with other therapies.
2. Beta-blockers: These are the medicines which help in reducing the heart rate hence, helps in lowering blood pressure.
Answer: Anti-adrenergics and Diuretics
Explanation:
Doctors do not prescribe medication until the patients's blood pressure reaches 160/100, below this the hypertension is considered as mild hypertension.
For the people who is already suffering from diabetes and kidney disease, medications will be use at 130/80.
Diuretics are commonly known as water pills. These work by helping the kidney to eliminate sodium and water out of the body. This process decreases decreases the volume of blood and the heart needs to less pump with each beat, which lowers the blood pressure of the body.
Anti-adrenergics are another class of drugs that is offered to the patients suffering from the problem of hypertension. These drugs lowers the blood pressure by limiting the action of the hormone epinephrine and norepinephrine, which relaxes the blood vessels which reduces the spped of heart's contractions.
A possible consequence of eutrophication is A. Reduction of nutrient levels in a body of water B. Fish kills, because of the lowered dissolved oxygen in the water C. An increase in the biodiversity of the body of water D. Sequestration of dissolved toxins in lake sediments
Answer:
B. Fish kills, because of the lowered dissolved oxygen in the water
Explanation:
Eutrophication refers to the algal bloom as caused by increased levels of nutrients in water bodies. The algal population uses the dissolved oxygen and makes it unavailable or scarce for animals such as fishes present in the water bodies. The scarcity of oxygen leads to the death of fishes in a eutrophic water body.
Answer:
b
Explanation:
What are keratinocytes? What is keratin?
Answer:
Keratin: keratin is a type of fibre-protein that can be found in hair, nails, other animal structures, and in our skin.
A really important function of keratin is the one it has in our skin, which consists of protection and holding cells together.
Keratinocytes: keratinocytes, as the "-cytes" suggests, are a type of cell found in our skin, with the function of producing keratin.
A deficiency or problem with these cells can cause a couple of different issues, such as the weakening or growth problems of the diverse amount of things containing significant amounts of keratin.
Hope it helped,
BiologiaMagister
Mitosis and meiosis differ in several ways. Meiosis, but not mitosis, _____. involves two bouts of cell division results in four (rather than two) daughter cells changes the chromosome number of the daughter cells introduces genetic variation among daughter cells is correctly described by all of these statements
Answer: is correctly described by all of these statements
Explanation:
Meiosis is the process that enables sexual reproduction to occur. It ensures that a haploid phase exists throughout the life cycle, which will have the diploid phase restored through fertilization. The four daughter cells have half the number of chromosomes in comparison with the mother cell. Meiosis is composed of two "rounds" prophase-metaphase-anaphase-telophase-cytokinesis cycle (meiosis I and meiosis II). Despite being very similar to mitosis, these cycles have some fundamental differences. This process is important for increasing the genetic variability of daughter cells. And genetic variability is a necessary thing for the evolution and survival of the population.
Excitation-contraction coupling is a series of events that occur after the events of the neuromuscular junction have transpired. The term excitation refers to which step in the process?
Answer:
Excitation refers to the generation of action potential along the sarcolemma.
Explanation:
Excitation-contraction coupling may be defined as the process in which an electrical stimulus can be converted into the mechanical response of the body.
The calcium ions are released in the process of excitation-contraction coupling. The release of calcium ions is responsible for the generation of action potential. This action potential is important for the contraction of the muscle.
Excitation in excitation-contraction coupling refers to the conversion of nerve impulses into a chemical signal, initiating muscle contraction.
Explanation:In the context of excitation-contraction coupling in muscle cells, the term 'excitation' refers to the step where a nerve impulse, or action potential, arrives at the neuromuscular junction, causing the release of the neurotransmitter acetylcholine. This neurotransmitter then binds to receptors on the muscle cell membrane (sarcolemma), triggering a change in membrane potential and initiating a series of events that ultimately lead to the contraction of the muscle fibre. Thus, this 'excitation' part of the process essentially involves the conversion of an electrical signal (nerve impulse) into a chemical signal (release of acetylcholine), which then initiates another electrical signal within the muscle fiber, setting in motion the contraction process.
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15. Which of the following cellular organelles is NOT found in the majority of plant cells? a. Centrioles c. Cellulose Cell Wall b. Chloroplasts d. Central Vacuole
Answer: a. Centrioles
Explanation:
Centrioles are a pinwheel array of triplet microtubules organelles found in the cells of animals and most protists. Centrioles influence in cell shape, move the chromosomes in cell division, by the way, they are not present in plants and fungi. Some centrioles also contain DNA, which apparently helps control the synthesis of their structural proteins.
Which two organs of the body release hormones that lead to the release of thyroid hormone?
Which of the following statements is TRUE about vitamin and minerals?
a. Vitamin D is a water-soluble vitamin that is stored as hydroxycholecalciferol and released so that bones and teeth form normally.
b. Deficiencies in Vitamin B12 can lead to pernicious anemia.
c. Iodine in used to construct hemoglobin and is concentrated in the thyroid gland
d. Vitamin C, also known as folic acid, can lead to kidney stone formation when it is too heavily concentrated.
Answer:
The correct answer is option b. "Deficiencies in Vitamin B12 can lead to pernicious anemia".
Explanation:
Pernicious anemia is a medical condition at which the body could not make enough healthy red blood cells because it lacks vitamin B-12. The lack of vitamin B-12 makes that red blood cells became bigger, which makes them inefficient for oxygen transportation, producing anemia in the patient. This condition is easily treated with the intake of vitamin B-12 pills or shots