A sample of moon rock was brought back from the latest moon mission. Scientists are eager to date this rock to see when it was formed. They will use a technique called radiometric dating. Their data is shown below. Help the scientists calculate and draw conclusions about each sample.
Potassium-40 decays into Argon-40, known as K-Ar dating. Potassium-40 has a half-life of 1.25 billion years.
Identify the number of half-lives passed after 3.75 billion years.
Explain how you came to this conclusion.
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The number of half lives that have passed is obtained from the question is 3 half lives.
What is the half life?We know that many times, the scientist is faced with the issue of trying to date a material. This is because, we often need to know the exact period in which the material may be rightly said to belong. This have helped us to decode the age of so many materials that we have in the world today.
The half life is the time that it takes for only half of the radioactive materials to remain in a sample. We have been told that Potassium-40 decays into Argon-40, known as K-Ar dating. Potassium-40 has a half-life of 1.25 billion years. The task that we now have is to be able to Identify the number of half-lives passed after 3.75 billion years.
We can now say that the number of the half lives is;
3.75 * 10^6 years/ 1.25 * 10^6 years
= 3 half lives
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Related Questions
Some students set up an experiment to investigate osmosis. They filled two pieces of dialysis [visking] tubing with different liquids and left them both in a beaker of 5% sucrose solution for an hour. Describe and explain the likely results after one hour.
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Visking tubing is a partly permeable artificial membrane that allows smaller molecules such as water and glucose to flow through its minute gaps. Larger molecules, such as starch and sucrose, are unable to flow through it.
What occurs during the Visking tubing experiment?Water osmotically travels over the membrane from the rising water concentration (dilute solutions) in the beaker to the poor water content (concentrated solution) in the Visking tubing, increasing the amount of liquid in the Visking tubing and forcing liquid up the capillary tube.
When sugar dissolves in water, water and sucrose molecules create weak connections. These connections make it more challenging for water to osmotically exit the solution.
Starch molecules are too big to pass through the artificial selectively permeable membrane.
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3. Which of the following would best support the theory of evolution?
a. Evidence that shows a change in species over time
b. Evidence that shows how biotic and abiotic factors have changed over time
c. Evidence that shows a decrease in resources but an increase in the number of organisms.
d. Evidence that shows there has been little to no change in a species over time
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The theory of evolution will be best supported by the evidence showing a species changes over time. Thus, option A.
Basic evidences for proving the theory of evolution are anatomy, Biological morphology, Fossils and direct observations. There have been various theories for the proof of evolution like structural similarities in an embryo formation pointed towards common ancestors. Theory of Natural selection embarked by Charles Darwin to show genetic variations picked by organisms in whole population.
The most authentic theory over evidence for evolution is Paleontological theory which includes study, observation and acquired prove of fossils of various organisms in the forms of Petrified, mold and cast, trace fossils, compression fossils, impression fossils, etc.
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how does reduced biodiversity affect humans
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Instead of an indicator or reagent for the lipid test, what was used?
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Instead of a reagent we can use emulsion test to identify a lipid molecule.
Using wet chemistry, the emulsion test is a technique for identifying the presence of lipids. The process involves suspending the sample in ethanol so that any lipids it contains can disintegrate (lipids are soluble in alcohols). The liquid, which contains dissolved fat and alcohol, is then decanted into water.
Procedure to do an emulsion test for lipids:
Add the ethanol, then shake. Shake the sample vigorously for a minute after adding ethanol.Fill the water with the solution. In a test tube filled with water, pour the entire solution next.Look for the development of a milky white emulsion. Lipids won't mix with water since they are immiscible in water due to their insolubility.Any lipids in your sample will consequently float to the surface and create a milky white emulsion. The milky tint will become more noticeable the more lipids there are in your sample.To know more about lipids visit:
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PLEASE HELP ASAP
2) The balanced chemical equation. for cellular respiration is:
C6H12O6+602>>>6CO2+H20+heat+ATP
How does this equation represent the law of conservation of matter- that matter. cannot be created or destroyed?
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The number of carbon, hydrogen and oxygen are same on the both side of the equation.
slow pain is mediated by what type of nociceptor? group of answer choices ruffini's free endings polymodal nociceptors merkel's disk a-gamma fibers a-delta fibers
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polymodal nociceptors that are capable of evoking a range of pain sensations and responses
Polymodal nociceptorWide dynamic range nociceptive neurons, also known as polymodal-nociceptive neurons. Both painful and non-painful cutaneous and/or visceral stimuli stimulate these neurons (polymodal nociceptive neurons). Diverse noxious stimuli cause these neurons to fire (mechanical, thermal, chemical, etc.)Additionally, distinct subsets respond to various stimuli, with the majority being classified as polymodal based on anatomical, in vivo, and in vitro electrophysiological data. But morphological and electrophysiological information has also demonstrated that some nociceptors are more sensitive to a limited spectrum of stimuli.To learn more about Polymodal nociceptor refer:
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How do you tell the difference in atoms
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What system is most responsible for sensing that there are low water levels in the body and letting you know that you need to drink water to maintain your homeostasis?.
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what would be the effect on leading-strand and lagging-strand synthesis of inactivating each of the following enzymes in an e. coli cell [note that e. coli is a typical prokaryote]? a. primase b. dna ligase c. dna polymerase i (pol i)
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Topoisomerase inhibits the tightly bonded double-stranded DNA, primase synthesizes RNA during DNA replication, and DNA polymerase 1 is used to initiate the DNA replication process.
What is DNA ligase and what is its work and how it inactivates the enzyme in e-coli?By catalyzing the formation of phosphodiester bonds between double-stranded DNA fragments with juxtaposed 5'-phosphate termini and 3'-hydroxyl termini in the presence of the NAD cofactor, E. coli DNA Ligase is a ligation enzyme that can be used to connect DNA fragments.
Inactivating DNA ligase in e-coli, a prokaryotic bacteria the leading and lagging strands both would not get binded.Because DNA ligase has the function of joining both overhanging stretches of DNA.Inactivating primase in e-coli would not synthesize RNA which is needed to initiate DNA replication.Inactivating DNA polymerase 1 in e-coli would not initiate the DNA replication process.To know more about e-coli visit:
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In which cell diagram is ATP being utilized for the transport of molecules?
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Answer:
answer is cell A only
When a molecule of oxygen moves from outside of a eukaryotic cell to eventually be reduced by complex iv of the electron transport chain, how many phospholipid bilayers does it need to cross?.
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Complex 4 called cytochrome a₃ is responsible for the conversion of O₂ to H₂0 by crossing 4 phospholipid bilayers.
What is a phospholipid bilayer and how cytochrome reduces Oxygen?The ETS called an electron transport system is embedded in the inner membrane of the eukaryotic cell for the process to be carried out.The NADH+H is reduced to NAD through complex 1 (FeS) then succinate is converted to fumarate through complex 2 FAD and FeS.The complex called cytochrome b, FeS, and cytochrome c₁ has a rollover from complex 2 and the 1/2 O₂ reduced to H₂O is this step by cytochrome that is reduced.And finally, the ATP synthase that is ADP+ Pi to ATP.To know more about the Electron transport chain visit:
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dna hybridization techniques, such as fish, require the melting and re- annealing of dna to its original form. what chemical feature of dna allows for this to occur?
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The chemical feature that allows the melting and re-annealing of DNA to its original form is Hydrogen bonding between bases (we can easily open up AT-rich regions of DNA).
DNA is made of four nucleotide bases. The nucleotide base Adenine pairs with Thyme. The nucleotide base Cytosine pairs up with Guanine. The number of hydrogen bonds between Adenine and Thymine is two whereas the number of hydrogen bonds between cytosine and guanine is three.
Techniques like DNA hybridization which require Melting and re-annealing of DNA can happen because the hydrogen bonds between adenine and thymine are easier to break.
The A-T rich regions can be melted at high temperatures to break down the DNA and can be annealed afterward by ligases.
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Name two species that influence each other and give examples of how this relationship between the species may have influenced the development of each species.
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Coyotes and rabbits are two species that influence each other. The ecological relationships between the species that may have influenced the development of each species include, for example, predator-prey relationships or parasitism.
What are ecological relationships?The term ecological relationships make reference to the associations between species in a trophic chain of a given ecosystem, which shapes the development of these species and largely determines their evolution over a long period of time.
These ecological relationships may include predator-prey relationships as occur in the case of coyotes and rabbits, which represent the predator and prey, respectively. Another important type of ecological relationship is parasitism, where one species is benefited and the other is harmed (i.e., the host).
Therefore, we can conclude that predator-prey relationships are a type of ecological relationship which may shape the development of species such as coyotes and rabbits in an ecosystem.
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suppose that there were two natural isotopes of copper. 80% of the atoms had a mass of 63, and 20% of the atoms had a mass of 65. what would that average atomic weight of copper be?(round your asnwer to 3 sit figs and do not include units)
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According to the given statement that average atomic weight of copper be 63.4u.
What is an element's atomic weight?The use such of an element's atoms expressed in atomic mass units is known as its atomic weight (amu, also known as daltons, D). The mass of each isotope is divided by its abundance to produce the atomic mass, which is a weighted sum of all the isotopes of that element.
Briefing:The mass percentage of the isotope with atomic number 63u is 80%.
The mass percentage of the isotope 65u has a value of 20%.
average atomic mass = 63 x 80/100 + 65 x 20/100
= 50.4 + 13
= 63.4u
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the growth of 10 different plants is recorded what is the independent variable
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Answer:
The independent variable is probably whatever is being used to create the growth, like water or light etc. The growth is the dependent variable.
Explanation:
Which type of microscopes was developed most recently? (1 point)
O fluorescence microscope
O electron microscope
O scanning tunneling microscope
O light-based microscope
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if the adjacent tryptophan codons in the trp operon leader sequence are mutated to alanine codons, what is the predicted effect on trp operon regulation?
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Attenuation may occur in response to high alanine levels.
What is Attenuation?Given that transcription and translation occur simultaneously in bacteria, attenuation is a suggested regulatory mechanism in some bacterial operons that results in the premature termination of transcription. A provisional stop signal, found in the DNA segment corresponding to the mRNA leader sequence, is involved in attenuation.
The ribosome gets stuck inside the attenuator region of the mRNA leader during attenuation. The attenuator either blocks production at that point or permits read-through to the structure gene portion of the mRNA and the production of the appropriate protein depending on the metabolic diseases.
Attenuation is a regulation mechanism that causes premature transcriptional termination and is present in all Archaea and Bacteria.
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During __________, frequently used synaptic connections in the brain strengthen while rarely used connections tend to thin. a. assimilation b. accommodation c. scaffolding d. synaptogenesis please select the best answer from the choices provided a b c d
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During synaptogenesis, frequently used synaptic connections in the brain strengthen while rarely used connections tend to thin. The correct answer is option(d).
Synapses, the points of contact where information is passed between neurons, are formed during a process known as synaptogenesis. This is necessary for the development of brain networks as well as for the overall design of brain connectivity. Synapses may have an electrochemical makeup. The brain expands significantly while a child is a baby. Synapse creation between neurons explodes in the early stages of brain development
The creation of synapses is a crucial step in brain development. It takes place after the birth, migration, and initial differentiation of neurons, and it is crucial for the development of neural networks. In the adult brain, synaptogenesis is still crucial for the activity-dependent restructuring of neural networks.
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Using the characteristics of life, explain why your lab stool is not alive.
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Some of the important characteristics of life are:-
Metabolism: It is a major characteristic of life without exception. All living organisms are made of chemicals. These chemicals, small or big, belonging to various classes, sizes, functions, etc., are constantly being made and changed into other biomolecules. These conversions are chemical reactions or metabolic reactions.
The sum total of all the chemical reactions occurring in our body is metabolism.
No non-living object exhibits metabolism here for eg. a lab stool that does not exhibit metabolism and hence is not alive.
Reproduction, is also a characteristic of living organisms but with a few exceptions. No non-living object is capable of reproducing or replicating by itself. Hence again it shows why a lab stool is not alive as it cannot reproduce as a living organism can.
The most complicated feature of all living organisms is the ability to sense their environment and respond to these environmental stimuli which could be physical, chemical, or biological. No nonliving object possesses such qualities.
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A stool is non-living as it does not possess any of the characteristics of a living organism.
Characteristics of life are
1.Sensitivity or Response to Stimuli- Living organisms shows response to diverse stimuli like plants shows sensitivity to light, they bend towards the source of light. A stool does not show any kind of response to different stimuli.
2.Reproduction- All the living organisms are capable of reproduction whether sexually or asexually but a stool having no living cells is not capable of reproduction.
3.Growth and Development- Organisms do show growth in their body and their structure but a stool is similar all the time it cannot grow on its own, it can only be modified with human efforts.
4.Energy Processing- All organisms use a source of energy for their metabolic activities. Some use energy from sun like plants and some use chemical energy from different substances to carry out metabolic activities. A Stool cannot perform metabolic activities in it as it has no living cells.
5.Regulatory mechanism- Even the smallest organisms are having complex structures and require multiple regulatory mechanisms to perform functions, respond to stimuli, and do other many things.
Hernce from the above points we can conclude that a stool is nonliving object as it does not show any response to stimuli, has no growth and development, is incapable of reproduction, also need no energy.
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of the following types of organisms, which are examples of microscopic algae? (select all that apply.) group of answer choices coccolithophores krill dinoflagellates photosynthetic bacteria diatoms
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All of the organisms in question i.e. coccolithophores krill dinoflagellates photosynthetic bacteria diatoms are examples of microscopic algae.
What are microscopic algae?
Planktonic algae, often known as microalgae, are aquatic organisms that are found in hundreds of different kinds worldwide. The most well-known microalgae species include coccolithophores, cryptomonads, golden algae, yellow-green algae, and euglenoids, but diatoms, dinoflagellates, and green algae are also present. Since there are so many diatoms floating around in the oceans, nearly half of the oxygen on Earth is created through photosynthetic activity. Despite the fact that diatoms and dinoflagellates are types of planktonic algae, they are sometimes mistaken for red or brown algae. Due to their inability to float freely, red and brown algae are not regarded as phytoplankton. Rarely single-celled, true red and brown algae stick to rocks or other surfaces rather than drifting at the surface. For the same reasons, multicellular green algae is not regarded as phytoplankton. Algae must be single-celled or colonial (a collection of single cells) and live and die in the water without being attached to any substrate in order to be classified as phytoplankton.
Following available literature, all of coccolithophores, krill dinoflagellates, photosynthetic bacteria, diatoms fall under microscopic algae.
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Where do cows being treated with antibiotics live?
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Explain how the above jars contain mini biospheres. The jars stones, seaweed, (which can live underwater), shrimp, and water sealed with a clear glass jar. They are on a still and exposed to sunlight ? Do they contain these necessities for life ? What are these necessities ? Explain how the jars contain these necessities or not . Is this a closed system. ? Explain all of your answers.
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The jars contain mini biospheres that have all the required elements for their survival. They are exposed to sunlight and contain all the necessities. It is a closed system.
What is a mini biosphere?
Mini biospheres are tiny ecological environments that surround and support life by absorbing natural resources like heat and light. A jar biospheres' fundamental tenet is that its ecosystem can survive without your assistance.
A self-sustaining terrarium is a carefully balanced plant ecosystem inside a closed container under exposed sunlight. So that they can coexist harmoniously, plants, environmental factors, microfauna residents, and even the container itself must all be properly taken into account. The necessities are the ecological processes in the jar that contain mini biospheres, such as the decomposition of organic materials. If they work properly, they supply nutrients for bacteria, algae, and other organisms to develop and reproduce.
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What areas of the brain are responsible for creativity in the brain.
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Answer:
Frontal cortex Is we’re you get ur great creativity at
Explanation:
What’s the distinction between Days 1, 2, and 3 and Days 4, 5, and 6? the creation of god
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In the account of the six days of creation by God the distinction between Days 1, 2, and 3 and Days 4, 5, and 6 is that God began creation with the non-living things in the environment and ended it with the creation of man in his image.
What are the things created by God during the six days of creation?The Six days of creation by God witnessed several distinct creative activities by God.
God created the universe in six days and on the seventh day, he rested.
The account of the creation by God is as follows:
On the first day, God created Night and Day.On the second day, God created the expanse or the HeavenOn the third day, God created the dry land called Earth as well as the grasses and fruit trees of all kinds. God also created the SeasOn the fourth day, God created the Sun, the moon, and the stars.On the fifth day, God created sea creatures, small and great. God also made the flying creatures of the heavens.On the sixth day, God created the land animals according to their kinds, both domestic and wild animals. Finally, God made man in his own image, male and female, He created them.Learn more about creation by God at: https://brainly.com/question/7095091
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Study the Punnett square to help you to choose the words to finish the sentences
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The complete sentence is: In a dihybrid cross of homogygous pea plants with round (R) yellow (Y) seeds, there will be a 9:3:3:1 ratio of 9 round yellow, 3 wrinkled yellow, 3 round green, and 1 wrinkled green plant.
One homozygous yellow round seed (YYRR) is crossed with another homozygous green wrinkled seed (yyrr). All plants in the F1 generation are heterozygous yellow round (YyRr). When this plant is self-pollinated, nine yellow round plants, three yellow wrinkled plants, three green round plants, and one green wrinkled plant are produced in the F2 generation.
The Punnett square is a table that lists every conceivable result of a genetic cross between two people of known genotype. The Punnett square is a square that has been partitioned into four quadrants in its most basic form.
The ratio of the dihybrid phenotypes is 9:3:3:1.
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Match the correct process of mitosis to its phase
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The answer is as follows:
The cell separates into new cells: TelephasePaired chromosomes separate at protein structure: AnaphaseDNA is replicated: InterphaseChromosomes aligned in the middle of the cell: MetaphaseWhat is meant by Mitosis phase?The five morphologically separate phases of mitosis are prophase, prometaphase, metaphase, anaphase, and telophase. Chromosome alignment and segregation are processes that go through distinct phases.When a parent cell divides to create two identical daughter cells, the process of nuclear division known as mitosis takes place in eukaryotic cells. Mitosis refers particularly to the division of the duplicated genetic material contained in the nucleus during cell division.The correct answer is as follows:
The cell separates into new cells: TelephasePaired chromosomes separate at protein structure: AnaphaseDNA is replicated: InterphaseChromosomes aligned in the middle of the cell: MetaphaseTo learn more about mitosis phase refer to:
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What relationship, if any, do you see between a star's color and its temperature? Select the three statements that are correct.
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As the star goes through its cycle, its temperature and composition change, and so does its color. Options c) Orange Stars are cooler d) Blue Stars are hotter, and e) The color of a star is directly related to its temperature.
How does temperature change during the star cycle?The star cycle begins with a nebula stage and ends in white dwarfs or supernovas, depending on the star's mass.
As the new star is formed, temperature increases and star composition changes, being the causes the stars change from one stage to the other through the cycle.
Usually, the star's color is an indicator of its temperature. Red stars have less temperature (about 3000ºC), while blue stars have the highest temperature (about 30000ºC). The sun -yellow star- is about 6000ºC.
Among the options, the correct ones are c, d, and e.
c. Orange Stars are cooler
d. Blue Stars are hotter
e. The color of a star is directly related to its temperature.
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Complete question
What relationship, if any, do you see between a star's color and its temperature? Select the three statements that are correct.
Select one or more:
a. Orange Stars are hotter
b. There is no relationship between a star's color and its temperature
c. Orange Stars are cooler
d. Blue Stars are hotter
e. The color of a star is directly related to its temperature.
f Blue Stars are cooler
which is the most likely function of the inner lining
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Answer:
Explanation:
Simple epithelium has only one cell layer where every cell is in direct contact with the underlying basement membrane. Generally, this type of epithelium is found inside the body probably due to the fragile nature and forms the lining of the body cavities, blood and lymph vessels, heart and respiratory system.
Being a thin layer has the physiological advantage of faster absorption and filtration especially when it lines the digestive tract and exchange surfaces of the lungs.
PLEASE ANSWER: How do humans help biodiversity in some ecosystems?
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Answer: Humans help biodiversity in ecosystems by buying fewer products and making sure the products you do buy, minimise the impact on biodiversity. Investing in ways that promote biodiversity. Reducing waste of consumer goods: food, clothes, electrical appliances etc. Recycling.
what are the similarity of pondweed cell and escherichia coli
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The similarity which exists between pondweed cell and escherichia coli include the following below:
Presence of DNA.Presence of cell wall.What is DNAThis is referred to as deoxyribonucleic acid and consists of various compounds such as base pairs, phosphate groups etc. It is the genetic material of living organisms and ensures that traits are passed from the parent to offspring during reproduction.
Pondweed is a plant while escherichia coli is an example of a bacteria and they possess DNA which is needed during reproductive activities. They also have cell wall which ensures that there is structural integrity in the cells of the organisms.
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The similarity which exists between pondweed cell and escherichia coli include the following below: Presence of DNA and presence of cell wall.
What does DNA?DNA (deoxyribonucleic acid) is a nucleic acid that has all the genetic characteristics of an individual. DNA (deoxyribonucleic acid) is a type of nucleic acid that plays a fundamental role in heredity, being considered the carrier of the genetic message.
Both plant cell and bacterial cell are composed of a cell wall. Both plant cell and bacterial cell are composed of DNA as their genetic material. Both plant cell and bacterial cell perform their own metabolic reactions.
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