The amount of the 30 gram-sample that will remain after 270 years is 6.61 grams
How to determine the number of half-livesWe'll begin by obtaining the number of half lives that has elapsed. This can be obtained as follow:
Half-life (t½) = 96 yearsTime (t) = 270 years Number of half-lives (n) =?n = t / t½
n = 270 / 99
n = 2.8125
How to determine the amount remaining Original amount (N₀) = 30 gramsNumber of half-lives (n) = 2.8125Amount remaining (N) =?The amount remaing can be obtained as follow:
N = N₀ / 2^n
N = 30 / 2^2.8125
N = 6.61 grams
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A seed is a fertilized and mature (A.ovary, B.fruit, C.ovule, D.egg), consisting of an embryo or two coytyledons.
Answer: D. Egg
Explanation:
A fertilized egg becomes a seed.
Name and describe the meiotic mechanism by which the fetus inherited the extra chromosome 21.
The meiotic mechanism by which the fetus inherits the extra chromosome 21 is non-disjunction.
Chromosome is the compact form of genetic material. it consists of DNA and histone proteins. The genetic material is inherited from parents to offspring in this form. Each chromosome consists of two sister chromatids joined at the center by a kinetochore.
Non-disjunction is the failure of the homologous chromosomes or the sister chromatids to separate equally during meiosis. The result is the abnormal distribution of the chromosomes. One daughter cell gets extra genetic material and another gets less. The non-disjunction of chromosome 21 causes a trisomy that results in Down's syndrome.
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Which term is used to describe the histologic characterization of tumor cells?
a. staging
b. grading
c. cachexia
d. angiogenesis
Grading is essentially a determination of the level of anaplasia and refers to the histologic characterisation of tumour cells.
What exactly is a cell tumour?a mass of tissue that develops abnormally when cells do not die on schedule or expand and divide more often than they should. Cancer-free tumours might be benign or malignant (cancer). Although benign tumours can become enormous, they do not penetrate or spread to surrounding tissues or to other areas of the body.What two varieties of tumour cells are there?There are two types of tumours: benign (noncancerous) and malignant (cancerous). Typically, benign tumours only develop in one location and do not spread. Invading other parts of the body after developing in one location, malignant tumours
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One of the keys to eating well in college is to? eat a complete breakfast. only eat salad. avoid all fats. never eat meals out.
A comprehensive breakfast with complex carbs, protein, and good unsaturated fats, such whole grain toast with peanut butter and bananas, is one way to eat healthily while at college.
How might college students' eating habits be improved?General Advice Have a positive attitude toward food and take pleasure in what you eat. Eat breakfast every day; include protein-rich foods like eggs, almonds, Greek yoghurt, or peanut butter within an hour of waking up. Eat regularly, preferably every three to four hours.
If you don't consume a balanced diet, you can really be harming your body in addition to being physically unable to engage in the activities you want to.
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During diabetic ketoacidosis the ph of the blood decreases. how does the body respond and why?
The overproduction of acetoacetic acid and -hydroxybutyric acid causes acidosis in DKA. These two ketoacids entirely separate at physiological pH, and the extra hydrogen ions bind the bicarbonate, lowering serum bicarbonate levels.
Why does diabetes cause a drop in blood pH?
As a result, the liver creates beta-hydroxybutyrate, an acid that gives the brain and muscles energy through the bloodstream.
However, if the body continues to use fat stores as fuel, this causes the blood's pH to drop as the sugar molecules circulate in the blood unused.
What transpires within the body while a diabetic is in ketoacidosis?The potentially fatal condition known as diabetic ketoacidosis (DKA) affects patients with diabetes. It happens when the body begins to break down fat at an excessively rapid rate. The fat is converted by the liver into a fuel called ketones, which makes the blood acidic.learn more about diabetic ketoacidosis here
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What evidence shows that the polar ice caps are melting?
What type of regulation occurs when the product of the regulator gene is necessary to shut off the expression of structural genes?
Negative Control regulation occurs when the product of the regulator gene is necessary to shut off the expression of structural genes.
Gene- The fundamental genetic component transferred from parent to child. Genes are composed of DNA sequences and are organized sequentially at specified sites on chromosomes in the cell nucleus.
DNA- DNA is an organic molecule that holds instructions for synthesizing proteins as well as genetic data. Most cells in every organism contain it. DNA plays a crucial role in reproduction because it allows for the hereditary transmission of traits from one or more parents to their children.
Structural Gene- A gene that produces ribosomal RNA, transfer RNA, or the amino acid sequence of a protein (such as an enzyme).
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A 1,200-kcalorie diet that is 15 percent protein supplies how many grams of protein?
A 1,200-kcalorie diet that is 15 percent protein supplies 180 kcalorie.
Formula to calculate the 15% protein supply,
[tex]\frac{1200 x 15}{100}[/tex] = 180 kcalorieProtein- Large, intricate molecules known as proteins serve a variety of vital functions in the body. They are crucial for the construction, operation, and control of a body's organs and tissues and carry out the majority of their job inside cells.
Tissue- Between cells and an entire organ, there is a biological organizing level called tissue. A tissue is a group of comparable cells from the same origin, along with their extracellular matrix, that work together to perform a single function. Then, various tissues are functionally grouped together to form organs.
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A combining form for a flexible form of connective tissue that covers the ends of many bones is:________
A combining form for a flexible form of connective tissue that covers the ends of many bones is cartilage.
Connective tissue is the tissue that joins, supports and protects various others organs and tissues of the body. The examples of connective tissue include: cartilage, adipose tissue, bones, tendons, etc. There are three types of connective tissues: loose, dense and connective.
Cartilage is the connective tissue. It can be found in locations like: between joints, bones, between the vertebrae, in the external ear, etc. The cartilage serves various purposes like support, protection, shape and structure, resistive forces, etc.
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A client is prescribed an optic eye medication that will mimic the action of the sympathetic nervous system. the nurse expects that this medication will:______
A client is prescribed an optic eye medication that will mimic the action of the sympathetic nervous system. the nurse expects that this medication will: dilate the pupil.
What is sympathetic nervous system?
A network of neurons in your body called the sympathetic nervous system aids in the "fight-or-flight" reaction. When you're under stress, in danger, or engaged in physical exercise, this system becomes more active. Its effects include accelerating respiration and heart rate, enhancing vision, and slowing down bodily functions including digestion.
The sympathetic nervous system regulates the muscles that enlarge the pupil.
Question:
A client is prescribed an optic eye medication that will mimic the action of the sympathetic nervous system. The nurse expects that this medication will:
1. prepare the eye for near vision.
2. increase the ability of the eye to tear.
3. constrict the pupil.
4. dilate the pupil.
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In addition to proteins, which substance helps maintain bubbles and promote foam?
In addition to proteins, bitter acids helps maintain bubbles and promote foam.
Proteins are the polymers of amino acids. These are long chain of amino acids joined together with the peptide bond, which can further exhibit various levels of structure like secondary, tertiary or even quaternary. The properties of proteins that help in stabilizing the bubbles and foam are: intermolecular forces, conformation and stability.
Bitter acids are the prenylated polyketides. They are produced by the lupulin gland of the hop plant. The examples can be humulone, adhumulone, etc. They are also known to maintain the bubbles and foam stabilization.
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The meristemoid cells in plants are similar to __in humans since they can not generate all types of tissues.
The meristemoid cells in plants are similar to blastocyst cells in humans since they can not generate all types of tissues and is denoted as option A.
What is Blastocyst cell?This is usually in the form of a ball which is produced within days of the sperm fertilizing the egg which is usually before implantation in the uterus.
On the other hand, meristemoid cells are self renewing and undergo series of divisions in other to form a larger cell. Balstocyst only generates the three types of primary germ layers which include:
EctodermMesodermEndodermThe meristemoid and blastocyst cells can't generate all types of tissues which is why it was chosen.
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The options are;
a) blastocyst cells
b) totipotent cells
c) adult stem cells
The most recent phylogenetic data suggests that bacteria and archaea may be more closely related than archaea and eukarya. True or false?.
False, Bacteria and archaea are not closely related than the archaea and eukaryote.
Bacteria- Bacteria are microscopic single-celled creatures without a distinguishable nucleus. They might have a sphere, a rod, or a spiral form. They live in almost every type of habitat, including soil, water, organic material, and animal bodies.
Archaea- Microbes known as archaea set the parameters for life on Earth. Extreme settings, such hydrothermal vents and terrestrial hot springs, are where they were first identified and characterized. Also found in wide variety like very salty, acidic, and anaerobic conditions.
Eukarya- A group of organisms, each of which cells contains a unique nucleus that houses the genetic material. Protista, fungi, plants, and animals are examples of eukaryotes.
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is table salt a compound? how can you tell?
Answer: Salt is an ionic compound, consisting of a crystal, lattice structure of the two ions Na+ and Cl-. Salt water is full of sodium chloride molecules.
Explanation:
hope this helps
Answer:
Chemically, table salt consists of two elements, sodium (Na) and chloride (Cl). Neither element occurs separately and free in nature, but are found bound together as the compound sodium chloride.
HOPE IT'S HELPS YOUAll life shares dna as the hereditary material. from an evolutionary perspective, why do you think this is the case?
All life is a result of a common ancestor that passed on both its genes and the means for employing them to its offspring. Therefore, DNA is crucial for the study of evolution.
The degree of genetic variation between two species indicates how different they are from one another and, in turn, how intimately or related in some way they are. The average genetic difference between individuals in modern humans is quite small—about 0.1%—whereas research on the chimpanzee genome's similar regions shows a difference of roughly 1.2%. A close relative of chimpanzee (Pan troglodytes), the bonobo (Pan paniscus) differs from humans in the same ways. Another African ape, gorillas, share a 1.6% DNA difference with humans. Most crucially, all three species—chimpanzees, bonobos, and humans—display the same degree of differentiation from gorillas. The orangutan, an Asian giant ape, is 3.1% different from us and the African apes. What are the monkeys like? For instance, the DNA of all great apes and humans differs from that of rhesus monkeys by around 7%. Geneticists have developed a number of methods for estimating the percentages, which produce a range of results regarding the degree of similarity between chimps and humans. For instance, only changes in the fundamental components of the genes that chimpanzees and humans share are measured when determining the 1.2% chimp-human difference.
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When an individual is stressed, which part of the nervous system initiates the stress response?
Answer:
sympathetic nervous system
Explanation:
The autonomic nervous system has two components, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers.
During the war a jet pilot does not obey the order to droop a bomb on a vilage because there are civilans which stage of moral development does kohlberg believe the pilot subscribe to
Kohlberg's principle of ethical improvement is a principle that makes a speciality of how youngsters broaden morality and ethical reasoning.
Kohlberg's principle shows that ethical improvement takes place in a chain of six stages. The principle additionally shows that ethical common sense is typically targeted on in search of and preserving justice.
For example, if a determine asks their infant to finish a chore across the house, the kid can also additionally ask what the gain might be to them. Parents frequently understand the “you scratch my lower back and I'll scratch yours” mind-set at this degree and provide a reward, consisting of an allowance.
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The thoracic cavity is situated superior to the abdominopelvic cavity and separated by the diaphragm. therefore, the diaphragm creates what type of plane?
The thoracic cavity is placed superior to the abdominopelvic cavity and separated by the diaphragm. therefore, the crosswise plane is made by the diaphragm.
The diaphragm, a fragile muscle that separates the chest from the belly, is found at the bottom of the chest. after you inspire, it flattens and shrinks. As a result, the lungs expertise a vacuum result that attracts air in. The diaphragm relaxes and therefore the air is forced out of the lungs after you exhale. Your diaphragm flattens and tightens as you inhale, slippy down toward your abdomen. Your chest will expand (grow bigger) and attract air as a result of this movement, which causes a vacuum in your chest. Your diaphragm relaxes and curves duplicate as you exhale as your lungs force the air out.
The crosswise plane could be a theoretical line separating the body's superior and inferior regions. it's parallel to each the mesial plane and therefore the flower arrangement plane. thus it's created between the cavum and abdominopelvic cavity.
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A certain biological molecule has the ability to absorb hydrogen ions. predict and justify what will happen to the ph if this molecule is added to a beaker of water.
In the body, excess hydrogen ions can be absorbed by chemical buffers, which prevent pH changes.
For instance, excess carboxylic acid may be produced by muscle cells during exercise, which raises hydrogen ions. The H2 molecule is chemically fairly inert and only exhibits mild van der Waals type interactions with a solid surface because of strong covalent intermolecular connections.
Therefore, it is generally acknowledged that molecules are physically adsorbed. However, the hydrogen molecule's chemical interaction with the surface atoms is also taken into account.
How do chemical buffers work?A extremely stable pH solution is referred to as a buffer. A buffered solution's pH won't appreciably alter if an acid or basic is added to it.
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A certain biological molecule has the ability to absorb Hydrogen ions. Predict and justify (CER) what is going to happen to the pH if this molecule is added to a beaker of water.--
If the molecule was added to a beaker of water, the PH level of the water would increase, making the answer more basic.
What is pH simple definition?
pH may be a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of but 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is basically a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
Why is pH important to the human body?
In humans, pH balance plays a task in keeping the body functioning optimally. the perfect pH of the body is slightly alkaline, which facilitates certain biochemical reactions like oxygenating the blood. The body has numerous corrective measures to stay pH in homeostasis (a stable state)
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Retinal cells that make connections with bipolar cells, ganglion cells, and other cells like themselves are called:_____.
Names the retinal cells that communicate with ganglion cells, bipolar cells, and other cells that are similar to them.
What are retinal cells?
Light must travel through layers of neurons and capillaries before it reaches the photosensitive regions of the rods and cones in vertebrates because the light-sensing cells are located at the rear of the retina. The optic nerve must pass through the retina in order to reach the brain because the ganglion cells, whose axons make up the optic nerve, are located at the front of the retina. The blind spot results from the absence of photoreceptors in this area.
Retina amacrine cells are interneurons that communicate with ganglion cells and bipolar cells.
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Most substances are able to undergo passive diffusion across the plasma membrane. True or false
The statement is false that most substances are able to undergo passive diffusion across the plasma membrane.
Passive diffusion is the movement of particles across the membrane from their region of higher concentration to lower concentration. This movement does not require any energy. The substances that can undergo passive diffusion are: gases like oxygen or carbon dioxide, ethanol, urea, etc.
Plasma membrane is the layer surrounding the outer surface of the cells. It is a bilayer of lipid. The functions of the membrane are: to protect the cell from outer environment and to regulate the traffic of substances crossing the membrane.
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Human beings tend to react to natural disasters by becoming more inward-looking, concerned only with their own well-being. True or false:
The answer is true. Numerous human activities such as overcrowding, pollution, the burning of fossil fuels, and deforestation have an adverse effect on the physical environment. Climate change, soil erosion, poor air quality, and undrinkable water have all been brought on by changes like these.
What impact do natural disasters have on both people and the environment?Natural catastrophes result in property devastation, financial resource loss, and disease or injury to people. In less developed nations, a lack of resources, security, and access to housing may cause a major influx of people.
Natural disasters are defined as severe geophysical or climatic catastrophes, such as volcanic eruptions, floods, cyclones, and fires, that pose a hazard to people or property. Catastrophes that are caused by human activity are referred to as man-made disasters (e.g. industrial chemical accidents and oil spills)
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Khalil is working toward a career in government service. what job would be in the field that khalil is interested in?
(a) sous chef for a catering business.
(b) student teaching in middle school.
(c) organizer for the parks department.
(d) hvac repairman.
Khalil is working toward a career in government service. the job that would be in the field that Khalil is interested in is an organizer for the parks department.
What are government services?
Government Service means development providing municipal, provincial, or federal services directly to the public. This use class doesn't include protective and emergency services, minor or major impact utility services, and public education services.
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The muscles of the eye need to make precise small motor movements. Which type of motor units would you find in the eye?
Answer:
The muscles of the eye need to make precise small motor movements. Therefore, ( SMALL ) motor units in the eye would be found find in the eye.
The final result of motor orders, the motor unit seems to be the smallest structural and functional part of the central nervous system. Single alpha motor neuron in the brain and the entire extrafusal muscle fibres it stimulates make up a motor unit. These muscle fibres can range in number from one or two to one thousand. A motor unit is made up of a single neuron, also known as a nerve cell, that provides nerves to a collection of skeletal muscles. This neuron activates all the muscle fibres in that specific motor unit to cause them to contract when it gets the brain's signals. Various kinds of fibres make up muscles.
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Temporary storage sites in the cytosol for substances such as pigments or nutrients are called?
Temporary storage sites in the cytosol for substances such as pigments or nutrients are called inclusions.
Pigments are the compounds that have a certain color and provide color to other structures indie the body. For example in plants chlorophyll is the pigment that provides green color to the leaves and stem. In humans and other animals, the blood consists f red colored pigment called hemoglobin.
Inclusions are the non-living objects inside the cell. They can be anything like pigments or any other molecules, that performs no function inside the cell. They are also called ergastic substances and do not even have any membrane.
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Which of the following is true of the Protist Kingdom? (there may be more than one answer)
-they are eukaryotic
-they can be heterotrophs
-they can be beneficial
-they are prokaryotic
-they can be autotrophs
-they can be harmful
Protist Kingdom they are eukaryotic, they can be heterotroph, can be beneficial, they can be autotrophs.
What are the characteristic features of kingdom protist?The kingdom Protista are eukaryotic organism in nature which include both unicellular and multicellular eukaryotic organisms which are the intermediate between plants and animals.
They ack differentiated vegetative tissues, except the reproductive structures, variable in shape, found in variety of places such as soil, fresh water, ocean floor, decomposing organic matter, etc.
The protists exhibit both autotrophic and heterotrophic mode of nutrition, or phagotrophic, saprobiotic or parasitic strategies.
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After reviewing and analyzing Quintans experimental results, Janelle believe that his experiment contains errors which led to an incorrect conclusion which of the following explains what janelle can do to confirm her analysis of the experiment
She can replicate Quentin's experiment to see if she gets the same results to confirm her analysis of the experiment
What is analysis ?The analysis/goals discussion's are to clearly interpret the findings, examine what they might reveal about the issue in general, consider how your experimental design might have been improved, and consider what might come next in order to fully address the research topic.
Experimental data are statistically analysed to find errors and eliminate them. The errors are brought about by human error, such as a poor experimental design, or by measuring system flaws.Analyzing something involves dissecting it into its constituent elements in order to understand what each one does and how they work together.Learn more about Analysis here:
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Archaea with a plasma membrane composed of a tetraether monolayer would most likely be found __________.
The correct answer for this question is at a temperature of 90 degrees
Archaeal and bacterial lipids (A) Phosphatidylglycerol (PG) from Escherichia coli is a bilayer forming lipid in bacteria. The acyl chain can be branched, have a cyclohexyl group at the end, or have one or more unsaturated bonds.
The cytoplasmic membrane of bacteria and archaea determines the composition of the cytoplasm to a large extent. Because ion gradients across membranes, particularly proton and/or sodium ion gradients, are critical for the bioenergetic conditions of these microorganisms, strategies to limit permeation are required.
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An example of _________ correlation would be the more a mother smokes, the more damage a fetus suffers.
Positive
An example of positive correlation would be the more a mother smokes, the more damage a fetus suffers.
What is a positive correlation?A positive correlation is defined as the tendency of two variables to move in the same direction.When one variable tends to go down as the other goes down or when one variable tends to go up as the other goes up, there is a positive correlation.How can you tell if a correlation is favorable?The correlation coefficient is calculated on a scale from + 1 to -1.Either + 1 or -1 represents a variable's complete connection with another. When one variable declines as the other grows, the correlation is negative; when both variables increase , it is positive.To learn more about correlation visit:
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Which phylum of the animal kingdom includes all organisms which possess a spine (backbone)?
Phylum Chordata of the animal kingdom includes all organisms which possess a spine (backbone).
Phylum Chordata includes all the vertebrate organisms, that possess a backbone. They have the organ system level of organization. These are bilaterally symmetrical, triploblastic and coelomate animals. The examples are: lampreys, humans, birds, etc.
Spine is the backbone of an organism. In humans, it is composed of 5 types of bones, that are total 33 in number. The spine is responsible for giving an erect posture and support to the body. The spine begins from the end of the skull and extends till the hip bone.
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