The Isotope calcium-41 decays Into potassium-41, with a half-life of 1.03 x 105 years. There is a sample of calcium-41 containing 5 x 10⁹ atoms.
How many atoms of calcium-41 and potassium-41 will there be after 4.12 x 105 years?
OA 3.125 x 108 atoms of calcium-41 and 4.375 x 10⁹ atoms of potassium-41
OB. 6.25 x 108 atoms of calcium-41 and 4.6875 x 10° atoms of potassium-41
OC. 6.25 x 108 atoms of calcium-41 and 4.375 x 109 atoms of potassium-41
OD. 3.125 x 108 atoms of calcium-41 and 4.6875 x 10° atoms of potassium-41
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The correct answer for this question will be option D.
Calcium-41 = 3.12×[tex]10^8[/tex] atoms
Potassium-41 = 4.69×[tex]10^9[/tex] atoms
As stated in the question,
Half life of isotope of Ca-14 which decays into K-14 = 1.03 × [tex]10^5[/tex] years
Therefore, after 1.03 × [tex]10^5[/tex] years (1 half life)
Ca-41 will be 50%
and, K-41 will be 50%
After 2.06 × [tex]10^5[/tex] years (2 half lives)
Ca-41 will be 25%
K-41 will be 75%
After 3.09 × [tex]10^5[/tex] years (3 half lives)
Ca-41 will be 12.5%
K-41 will be 87.5%
After 4.12 × [tex]10^5[/tex] years (4 half lives)
Ca-41 will be 6.25%
K-41 will be 93.75%
After 4.12 × [tex]10^5[/tex] years,
Ca-41 = 6.25/100 × 5×[tex]10^9[/tex]
= 3.12 × [tex]10^8[/tex] atoms
K-41 = 93.75/100 × 5×[tex]10^9[/tex]
= 4.69 × [tex]10^9[/tex] atoms
Therefore, option D is correct.
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True or False: Smaller objects (like a cell) will have a greater surface area to volume ratio
Answer: false
Explanation:
Answer: for the ed-puzzle with the amebo sisters it is true
Explanation:
The theory of island biogeography suggests that island colonization is affected by which of the following factors?
Allopatric speciation
Ecological tolerance
Adaptative evolution
Migration rates
The theory of island biogeography explains that two factors affect island colonization. These are migration and extinction, associated with the distance from the mainland and the island size. Option D. Migration rates.
What is the theory of island biogeography?
The ecologists MacArthur and Wilson took the term island biogeography to refer to the predictions about the number of species inhabiting an island.
According to MacArthur-Wilson (1967)
The number of species on an island represents a dynamic equilibrium between the opposite forces of immigration and extinction rates. At equilibrium, the species richness keeps constant. But the species composition changes.Each island can have a certain number of species, but these species are not always the same, meaning that species might renew. Interspecific competition has a significant role.Island biogeography theory establishes that the two factors that affect species richness in natural communities on an island are the distance from the mainland and the size of the island.
At the same time, these factors affect immigration and extinction rates.
According to the theory,
Effect of distance ⇒ islands that are closer to the continent have higher possibilities of receiving immigrants than those islands that are located farther from the mainland. Effect of size ⇒ relation between island size and species diversity. On smaller islands, the probability of extinction is higher than on bigger islands. Bigger islands can have more species than smaller ones.The assumptions of the equilibrium theory:
The immigration rate depends on the distance of the island to the mainland.The extinction rate depends on the island size.All the species have the same chances of getting to the island.Predictions:
At equilibrium, the number of species is constant in time.Dynamic equilibrium means continuous species renewal.If the island gets bigger, species richness increases.If the island is closer to the mainland, species richness increases.The correct option is Migration rates. Option D.
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A cell is unable to synthesize proteins. What most likely caused this?
Answer:
The ribosomes have been destroyed.
Explanation:
Hope this helped!
The answer is Mutation!
A cell has a mutation that makes it unable to appropriately synthesize proteins.
A mining company hires a team of scientists to research how their mines impact local wildlife. They are not happy with the results, so they wait a few years to publish. They do not include the name of their company in the publication. The language is vague and some findings are omitted. The results are published online, not in a scientific journal.
when evaluating this info, which is most concerning?
The most concerning part of the publication is that, some findings are omitted.
What is most concerning?Scientific information is always published in journals. Journals are peer reviewed articles that are available for the consumption of the scientific community. The language in which the journal article is written must be professional and the details of the research must be fully published.
In this case, it is worthy of note that it is very disturbing that some findings are omitted. This was intentionally done to mask the extent of damage that activities of the company does to wild life.
Hence, the most concerning part of the publication is that, some findings are omitted.
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Answer: Reliability
Explanation:
Name a pair of amino acids whose R-groups would be electrically attracted to each other
Answer:
Due to the presence of amino functional groups in lysine and arginine, two of the polar amino acids are basic (positively charged). The two classes of amino acids—acidic and basic—are electrostatically attracted to one another and can interact in this way.
Explanation:
how could the elements found in sugar molecules that organisms digest combine with other elements to form polypeptide chains?
Polypeptide chains formed is a product of digested components of Sugar.
How polypeptide chains are formed from sugars?One carbon residue of glucose can be marked to indicate that it is being used to synthesize glucogenic amino acids. This tagged carbon is visible when amino acids are separated. have alcohol groups, which means that they can be bonded together through dehydration reactions or dehydration activities where water is lost. Proteins contain carboxylic acids, which have alcohol groups and are easily able to give up those alcohol groups in order to establish a bond, in contrast to sugars, which have no age group on the alpha-beta carbon. And as a result, they may communicate with one another. Additionally, because they are both polar, they can dissolve in other polar substances.A dehydration synthesis (condensation) reaction creates each bond. A molecule of water is produced during the protein synthesis process when the carboxyl group of the amino acid at the end of the expanding polypeptide chain combines with the amino group of the incoming amino acid. Peptide bonds are the resultant bond between amino acids.To know more about sugar molecules visit:
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What is Zyklon B?
A. The chemical used to gas Jews in the camp showers
B. The name for the Jewish ghetto in Berlin
C. The first death camp built in Poland
D. The chemical used by Nazi troops, also known as "mustard gas"
Answer: B
Explanation:
How do prokaryotes and eukaryotes differ in terms of their compartmentalization?
PLEASE HELP NOW
The state psychology association has invited teams from all the colleges in the state to compete in a Psych Bowl. The teams will answer questions such as "Who founded the first psychology laboratory?" Where is this information stored?
Group of answer choices
conceptual memory
short-term memory
long-term memory
primary memory
Answer:
The answer is long-term memory.
Answer:
long term I think
Explanation:
sorry if wrong
At the dawn of industrialization, why were entrepreneurs important to changing economies in Europe?
The entrepreneurs produced new goods and services.
What is industrialization?The process of industrialization is the process that saw to the emergence of so many industries in Europe and lead to increased production. This happened during the industrial revolution of the 1800s.
During this period, there were a lot of new products that hit the market and technology was developing at a very fast rate. This period of industrialization was driven by coal.
The entrepreneurs were important to changing economies in Europe because they were the ones that initiated new business concerns, saw to the advancement of technology and generated money by the production of new goods and services.
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Answer:
A) They started a number of new businesses.
B) They improved on the available technology.
D) They developed new products and inventions.
E) They invested money in new businesses.
Explanation:
Got it correct if its for the one on ed
How could differences in compartmentalization affect reaction efficiency?
Answer:
Cell compartmentalization mentions the way organelles in eukaryotic cells live and work in discrete areas inside the cell in order to accomplish their precise functions more competently. Compartmentalization upsurges the efficiency of several subcellular processes by concentrating the mandatory components towards a restricted space inside the cell. A precise condition is mandatory to simplify a prearranged subcellular process; this might be locally controlled so as not to disturb the function of remaining subcellular compartments.
Explanation:
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2 A student investigated the diffusion of substances through Visking tubing, an artificial membrane which has some of the properties of cell membranes. The student made a bag of Visking tubing as shown in Fig. 4.1. top of syringe. elastic band Visking bag. knot bag filled with starch solution (a) (1) Explain these results. and placed into a test-tube of water Fig. 4.1 test-tube starch solution water The student added some iodine solution to the water in the test-tube. After 30 minutes at room temperature, the contents of the Visking bag were stained blue-black, but the water outside remained a yellow colour.?
Answer:
Visking tubing is a selectively permeable membrane, this means it has pores in it which allow small molecules through but not larger molecules
Explanation:
I hope this helps
Treatment Goals
Describe why the treatment plant was not removing nitrites and nitrates from the water.
How did you fix this problem?
High school gizmo
The treatment plant was not removing the nitrites and nitrates from the water because the ammonia must be converted before the remaining water's nitrates can be removed, they did not have the conversion tanks in the proper order to be able to convert it.
Ammonia, which has the chemical formula NH3, is a compound containing nitrogen and hydrogen. The most straightforward binary pnictogen hydride is ammonia. It is an odorless gas with a potent scent. By acting as a precursor to 45% of the world's food and fertilizers, it significantly helps meet the nutritional needs of terrestrial organisms. In terms of biological waste, particularly among aquatic organisms, it is a typical nitrogenous waste.
How can nitrates and nitrites be removed from water?
Nitrates are a difficult contaminant to remove from water, and filters cannot handle this task by themselves. Nitrates can be removed from water using distillation, reverse osmosis, or ion exchange resin.
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How do prevailing winds and ocean currents affect the climates of different regions?
Answer: Hello: ) Ok so we should know that Global winds and ocean currents are responsible for distributing global heat, which directly affects continental climates. Different winds cause currents to flow in different directions. Prevailing winds bring air from one type of climate to another. For example, warm winds that travel over water tend to collect moisture as they travel; the water vapor in the air will condense as it moves into colder climates, which is why temperate coastal areas often receive heavy rainfall. The winds move air masses, which causes weather. The direction of prevailing winds determines which type of air mass usually moves over an area. For example, a west wind might bring warm moist air from over an ocean. An east wind might bring cold dry air from over a mountain range.
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Explanation:
Jada used 60 pepper slices to make 3 pizzas how many does it take to make 6 of Jada’s pizzas?
If Jada used 60 pepper slices to make 3 pizzas, it will take 120 pepper slices to make 6 pizzas.
How many pepper slices will be used by Jada?According to this question, Jada used 60 pepper slices to make 3 pizzas.
The relationship between the pizzas prepared by Jada and the pepper slices used is a direct relationship i.e. as one increases, the other increases.
The number of pepper slices used can be calculated as follows:
If 60 pepper slices = 3 pizzas
6 pizzas = (6 × 60) ÷ 3
= 20 × 6 = 120
Therefore, if Jada used 60 pepper slices to make 3 pizzas, it will take 120 pepper slices to make 6 pizzas.
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An mRNA macromolecule transcribes genetic code from a DNA macromolecule in a cell’s nucleus and carries the code into the cytoplasm to synthesize a protein.
Which of the following statements is true about the nucleotides in the mRNA macromolecule and the DNA macromolecule?
The number of uracil bases in the mRNA is the same as the number of cytosine bases on the strand of DNA that it transcribed.
The number of uracil bases in the mRNA is the same as the number of thymine bases on the strand of DNA that it transcribed.
The number of uracil bases in the mRNA is the same as the number of adenine bases on the strand of DNA that it transcribed.
The number of uracil bases in the mRNA is the same as the number of guanine bases on the strand of DNA that it transcribed.
Answer:
The number of uracil bases in the mRNA is the same as the number of thymine bases on the strand of DNA that it transcribed.
Explanation:
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About how many cells make up a blastocyst?
Answer:
A blastocyst comprises of about 200 - 300 cells, following rapid cleavage.
Explanation:
In humans , blastocysts formation begins about 5 days after fertilizations.
The blastocyst has a diameter of about 0.1 - 0.2 mm .
The inner cell mass is also a source of embryonic stem cells.
I think that your answer would be at least 200 to 300 cells that make up a blastocyst.
Hope this helps
What happens during the electron transport chain phase of cellular respiration?
There is the formation of 36 ATP in cellular respiration which will be used to perform functions in the body.
The electron transport chain is also known as oxidative phosphorylation and in this, the electron transport chain forms a hydrogen gradient or proton gradient across the inner membrane of the mitochondria because the electron transport chain takes place in mitochondria and that is why it is called as powerhouse of the cell as all the ATP or large amount of ATP is generated by ETC and they generate around 36 ATP from one chain and this chain has series of proteins like ferredoxin, cytochrome, a and b, and phycocyanin, plastoquinone through which the electrons are passed on from each protein molecules and continue to do the redox reaction and the energy which is released from these reactions is caught by the formation of protein gradient which then undergoes the process of chemiosmosis to form the ATP. The protons are passed from the F1 F0 channel and using the ATP synthetase enzyme they synthesize ATP at the end of the electron transport chain electrons are transferred to the molecular oxygen which gets split in half and takes the H+ to form the water.
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List and briefly describe at least five general reasons behind creating GMOs
The GMO's increases the production rate and also increases the quality of the food.
List and briefly describe at least five general reasons behind creating GMO's?
The GMO's stands for the Genetically Modified Organism.
Reasons:
1. With the help of GMO's we can increase the rate of the yield production.
2. By creating GMO's we can reduced our costs which we spend on food or drug production.
3. By creating GMO's the need of pesticides is reduced.
4. The GMO's increased the quality and also the nutrients in the food.
5. The GMO's fight against the insects which damages the crops.
In today's world the GMO's give advantage to the mankind because the GMO's increases the availability of the food production and also increases the quality of the food, and it also plays an important role in the cleaning of the environment. In nowadays most of the food which are available in our markets, stores contain GMO's because it full fills the requirements in today's life.
So we can conclude that the GMO's increases the production rate and also increases the quality of the food.
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put the 6 boxes in the column that matches. If you have multiple boxes in one column, arrange them in order with the smallest number at the top and the largest number at the bottom.
Answer:
Hope this helped
Explanation:
Independent Variables are different from Dependent variables because the first word has the letter in in it so you technically ot subsite the boxes into each category or column
When describing the relationship between the chest and the abdomen, the chest lies __________ to the
abdomen
Answer:
the answer would be cranial.
Draw 2 diagrams to show allosteric activation and allosteric inhibition. Be sure to label all key parts.
What do toxins do in the body?
A. Destroy the body's cells.
B. Attack pathogens.
C. Strengthen your immune system.
D. Relieve pain.
Answer:
A. Destroy the body's cells
Explanation:
Explain how proteins are involved in controlling mitosis.
Explanation:
Almost all eukaryotic proteins are subject to post-translational modifications during mitosis and cell cycle, and in particular, reversible phosphorylation being a key event. The recent use of high-throughput experimental analyses has revealed that more than 70% of all eukaryotic proteins are regulated by phosphorylation; however, the mechanism of dephosphorylation, counteracting phosphorylation, is relatively unknown. Recent discoveries have shown that many of the protein phosphatases are involved in the temporal and spatial control of mitotic events, such as mitotic entry, mitotic spindle assembly, chromosome architecture changes and cohesion, and mitotic exit. This implies that certain phosphatases are tightly regulated for timely dephosphorylation of key mitotic phosphoproteins and are essential for the control of various mitotic processes. This review describes the physiological and pathological roles of mitotic phosphatases, as well as the versatile role of various protein phosphatases in several mitotic events.
Smokers tend to have an abundance of phagocytic cells in their lung tissue. Provide an explanation for why this is the case.
Answer:
Smokers tend to have an abundance of phagocytic cells in their lung tissue because these cells help to clear the lungs of debris and bacteria. Cigarette smoke contains many harmful particles that can damage the lungs, so the body produces more phagocytic cells to help clean them out. However, over time, the damage from the smoke can overwhelm the phagocytic cells, leading to lung problems.
Explanation:
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FIRST QUARTER
WORKSHEET 3
DOING SCIENTIFIC INVESTIGATION
In various situations, scientists employ a variety of investigational techniques. These techniques include fair testing, recognising and classifying, modelling, pattern seeking, and studying (in no particular order) in Scientific investigation.
The scientific method's seven steps for Scientific investigation
Pose a query - A question you want answered is the first stage in the scientific approach.Perform analysisForm your hypothesis.Try out your theory with an experiment.Make a discoveryAnalyze the findings, then come to a conclusion.Describe the findings.According to research, fair testing dominates Scientific investigation.
Descriptive investigationComparative investigationExperimental investigation are the three sorts of studies that scientists employ to explore and create answers for phenomena in nature.The complete question is :
What are the steps to be followed while doing a scientific investigation?
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Water is cohesive. Which describes this feature of water molecule
Water is cohesive therefore the feature of water molecules which best describes it is that they are attracted to each other.
What is Cohesion?This is referred to as the property of an atom or molecule which involves sticking together in a very tight manner as a result of the presence of some forces or bonds within them.
Water is a universal solvent which comprises of the elements known as hydrogen and oxygen and are used for various types of purposes such as drinking, washing etc.
Water as a compound is highly cohesive due to its ability to form hydrogen bonds with one another and is responsible for the surface tension which is experienced in its interaction with some other substances.
This cohesive property of water explains the way it works in different types of bodies and is therefore the reason why sticking together was chosen as the most appropriate choice.
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What is a bacteriophage?
A. bacteria that destroys DNA
B. virus that causes pneumonia
C. virus that infects bacteria
Answer: C
Explanation: a virus that parasitizes a bacterium by infecting it and reproducing inside it.
Answer:
The answer is C
Explanation:
Hope this helps:)
There were twelve elephants in the clearing.
a pulse rate of 141 beats per minute
orange fur with black stripes
✔
DONE
Answer:
There were twelve elephants in the clearing.
✔ quantitative data
a pulse rate of 141 beats per minute
✔ quantitative data
orange fur with black stripes
✔ qualitative data
Explanation: trust
Refer below to understand which data is qualitative or quantitative from the given example:
twelve elephants in the clearing: quantitative data since it gives us the number of elephants in the clearing. a pulse rate of 141 beats per minute: quantitative data since, it speaks about the average heart rate of the elephants and is measurable. orange fur with black stripes: qualitative data since it is not giving us a number rather the quality or type of fur. 28.5 cm tall: quantitative data since it gives us a measure of height.rough-textured: qualitative data since it is not giving us an idea about the quality or texture.bird bobbed its head up and down: qualitative data since it is talking about the activity of the bird.Learn more about qualitative and quantitative data here:
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