The image is three-dimensional which is produced by scanning electron microscopes this is not similarity between scanning electron microscopes and transmission electron microscopes
What is scanning electron microscopes and transmission electron microscopes ?Transmission electron microscopes (TEM) are types of microscopes that provide an image that is greatly enlarged while viewing specimens using an electron particle beam. TEMs have a 2 million-fold magnification capacity.
A focussed stream of electrons is projected and scanned over a surface by a scanning electron microscope (SEM) to produce a picture. The interaction between the beam's electrons and the sample results in a variety of signals that can be used to learn more about the surface's topography and composition.Compared to the SEM, the TEM has a resolution that is higher ( 0.2 nm), and HR-TEM can even achieve near-atomic resolution. Furthermore, TEM offers details on both elemental and complex structure (i.e., crystal structure, elemental information and morphology)Learn more about Microscopes here:
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1. What is the ultimate source of energy in the food we eat? I
Answer:The sun
Explanation:
Answer:
The sun
Explanation:
The ultimate source of the energy in food is the sun. The movement of energy from the sun through different organisms is what creates a food chain. Plants get their energy directly from the sun.
In pea plants, colored seeds coats are dominant to white seed coats. A heterozygous plant is crossed with a white seed coat plant. What is the chance of homozygous dominant offspring? (5 pts)
Genotype: Phenotype:
(Create Punnett square pls)
If colored seed coats are dominant to white seed coats, and a cross between a heterozygous plant Cc and a cc white seed coat plant is produced, then the chance of obtaining a homozygous dominant offspring is equal to zero percent (0%).
What is a genetic cross?A genetic cross is a phenomenon when two individuals cross to produce offspring, which may be represented by a Punnet square.
In this case, the Punnet square is equal to:
C c
c Cc cc
c cc cc
Therefore, with this data, we can see that none of the offspring from this cross is dominant CC for the trait and they can be colored (Cc 25%) or white (cc 75%).
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how many copies of the Ace gene are in the human genome
Answer:21,310 base pairs
Explanation:
the ara operon is an inducible operon that controls the production of the sugar arabinose. when arabinose is present in a bacterium it binds to the protein arac, and the complex binds to the initiator site to promote transcription. in this scenario, arac is a(n) and arabinose is a(n) .
The ara operon is an inducible operon that controls the production of the sugar arabinose. When arabinose is present in a bacterium it binds to the protein AraC, and the complex binds to the initiator site to promote transcription. In this scenario, AraC is a(n) activator.
The process of transcription uses the DNA found in the nuceloids of bacteria cells to create messenger RNA. However, the generation of these mRNA is dependent on the intracellular state of the bacterium, such as whether or not the protein encoded by the segment is required.
Only when there is no arabinose sugar present in the cell can AraC function as a repressor in this particular bacteria. AraC will function as an activator in the aforementioned context since sugar arabinose is present.
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Question 13 of 25
Engineers who work for a museum are designing a scale model of the
continent of Antarctica using a scale of 1:10,000,000. If Antarctica is about
5,300 km (5,300,000 m) across, how wide will the model be?
A. 53,000 m
B. 0.53 m
C. 5.3 m
D. 0.00053 m
well
1:10,000,000 = x:5,300,000
[tex] \frac{1}{10000000} = \frac{x}{5,300,000 } \\ 10000000x = 5,300,000 \\ x = \frac{5,300,000}{10000000} \\ x = 0.53[/tex]
so the answer is B. 0.53
How long can sequoia trees live?
Answer:
3,000 years.giant
sequoias can live more than 3,000 years
If a mutation occurs in a gamete, which of the following is most likely to result?
If a mutation occurs in a gamete, then the statement indicating that mutation will not always cause the offspring to be genetically disadvantaged. of is the most likely result of this change (Option 4).
What is a germinal mutation?A germinal mutation is any genetic modification produced during the formation of gametes, which are germinal cells that generate an individual. All germinal mutations are potentially inheritable, while somatic body mutations are not inherited because these cells are not used to generate an individual.
Somatic mutations are only inherited by the cell line which suffered such mutation and therefore may produce disequilibrium in the organism but not alters the genetic pool of the population.
Therefore, with this data, we can see that a germinal mutation can be inherited and therefore affect the fitness of the population.
Complete question:
If a mutation occurs in a gamete, which of the following is most likely to result?
If the mutation occurs on a recessive gene, it will most likely be expressed.
If the mutation is non-disjunctive then an extra chromosome could be in every cell of the offspring.
The mutation will not always cause the offspring to be genetically disadvantaged.
The mutation will not be passed on to the offspring.
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Question 2
Are there meaningful differences in CORT levels between campus and mountain juncos?
(a) Field study (females only)
Plasma corticosterone (ng/ml)
40
35
30
25
20
15
0
Mt Laguna
San Diego
15
(27)
(31)
30
Time postcapt
O No, both groups have the same CORT levels.
Yes, the CORT levels in the mountain population are lower than the CORT levels in the San Diego group
O No, this graph does not show enough information.
O Yes, the CORT levels in the mountain population are higher than the CORT levels in the San Diego group
2 pts
The meaningful differences in CORT levels between campus and mountain juncos is Yes, the CORT levels in the mountain population are higher than the CORT levels in the San Diego group.
What are mountains?A mountain is an elevated part of the earth's crust with significant exposed bedrock on its steep sides. Although definitions vary, a mountain can be distinguished from a plateau by its own limited summit area and is usually higher than a hill, usually at least 300 meters above the surrounding land. A mountain is an elevated part of the earth's crust with significant exposed bedrock on its steep sides.
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write a paragraph connecting the required terms from the curriculum & highlighting each
Chromosome structures are within cells and people that contained the genes of a cell, such as histones responsible for interacting with the double-stranded mode of organization, in the three levels of condensation, so favorable to the cell, as well as having part together to modulation of gene expression.
What is DNA and its function?DNA is the structure responsible for transmitting all genetic characteristics such as eye, skin and hair color, physiognomy, among others in the process of reproduction of living beings. In this way, the main function of DNA is to carry information contained in its sequences, called genes.
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a membrane protein in a plant root uses atp to transport nitrate ions from a fertilizer solution in the soil and concentrates them in the cell. this process is called:
Transport is fueled by active transport, which utilizes ATP's stored energy. Integral proteins in the cell membrane, which are comparable to pumps, are used in the active transport of small molecular-sized material to move material.
Moving upwards is considered active transportation.
A cell must use energy to transfer materials against a concentration or electrochemical gradient. This is exactly what active transport systems accomplish, using energy—often in the form of ATP—to keep the proper concentrations of ions and molecules in living cells.
A symporter is a carrier protein that transports two molecules in the same direction. An antiporter is a carrier protein that transports two molecules in opposing directions. Nevertheless, some porters are able to move a single molecule across the membrane. They're known as uniporters.
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A container holds 100 atoms of an isotope. This isotope has a half-life of 1.5 months. How many atoms of the radioactive isotope will be in the container after 3 months
answer: 25 atoms
25 atoms of the radioactive isotope will be in the container after 3 months.
Half life is the amount of time over which the number of parent isotopes decreases by half. When Two containers hold the same radioactive isotope. The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay. The half-life of a specific radioactive isotope is constant.
The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first-order reaction is a constant that is related to the rate constant for the reaction: t1/2 = 0.693/k.
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Which feature forms when one plate is forced to bend and dive under the other?
Answer:
What feature forms when one plate is forced to bend and dive under the other? subduction When an ocean plate collides with another ocean plate or with a plate carrying continents one plate will bend and slide under the other.
Answer: The answer is a subduction zone at a convergent plate boundary.
Explanation: Convergent plate boundaries are where two tectonic plates collide. When one plate moves beneath the other plate it is called subduction. Deep trenches and earthquakes are common occurrences at subduction zone locations.
scientists found an animal skull during an excavation and tested the amount of carbon-14 left in it. they found that 55 percent of the carbon-14 in the skull remained. how many years ago was the animal buried?
Animal was buried 4821 years ago.
The properties of radiocarbon, a radioactive isotope of carbon, can be used to determine an object's age using radiocarbon dating, which is also known as carbon dating or carbon-14 dating.
55% Carbon-14 is left in the skull.
If A₀ was the original amount of Carbon, the amount of Carbon that is remaining will be 55% of A₀ which equals 0.55A₀
Using the given equation:
[tex]A = A_{O} e^{-0.000124t} \\\\0.55A_{O} = A_{O}e^{-0.000124t} \\\\0.55 = e^{-0.000124t} \\\\ln(0.55) = ln( e^{-0.000124t} )\\\\ln(0.55) = -0.000124t * ln(e) \\\\ln(0.55) = -0.000124t\\\\t = \frac{ln(0.55)}{-0.000124t} \\\\t = 4821[/tex]
hence, option D is correct, the animal was buried 4821 years ago.
Scientists found an animal skull during an excavation and tested the amount of carbon-14 left in it. They found that 55 percent of the carbon-14 in the skull remained. How many years ago was the animal buried? Round your answer to nearest whole number. (Hint: A = A0e-0.000124t.)
A) 443,548 years
B) 362,903 years
C) 6,439 years
D) 4,821 years
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What is a biological catalyst
Answer: Enzymes
Explanation:
A catalyst is a substance that causes the rate of a chemical reaction to increase without undergoing any permanent change.
In the case of biology a biological catalyst would refer to enzymes.
Enzymes are most often protein in nature and catalyze numerous biological reactions.
Black fur in rabbits is dominant over brown fur. Cross a homozygous black rabbit with a brown rabbit. (4 pts)
Genotype: Phenotype :
(Create Punnett square pls)
The genotype and phenotype of the offsprings of crossing a homozygous black rabbit with a brown rabbit is as follows:
Genotype; Bb (4)Phenotype; All black rabbitsWhat is a punnet square?A punnet square is a graphical representation used to determine the probability of an offspring expressing a particular genotype.
According to this question, black fur (B) in rabbits is dominant over brown fur (b). if a homozygous black rabbit (BB) with a brown rabbit (bb) as follows:
BB × bb
BB - B and Bbb - b and bWhen these two parents genotype cross, all of the offsprings will be heterozygous (Bb) genotype and all black phenotype.
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The lytic cycle is one reproductive cycle that viruses can enter.
What is the name of the other virus life cycle?
A. Lytogenic
B. Lysogenic
C. Lysic
D.Lysosome
Answer: B. Lysogenic Cycle
Explanation:
when the membrane potential become more positive, changing for example from -70 mv to -50 mv, this is called . question 22 options: hyperpolarization nonpolarization depolarization repolarization
When the membrane potential becomes more positive, this is called depolarization.
When a stimulus reaches a resting neuron, depolarization happens. The gated sodium ion channels on the neuron's membrane suddenly open during the depolarization phase, allowing sodium ions (Na+) from outside the membrane to flood the cell.
What are the stages of nerve impulse transmission?
The action potential has three stages: depolarization, repolarization, and recovery. It moves swiftly down the neuron's axon as an electric current. At an electrical or chemical synapse, a nerve impulse is sent from one cell to another.
Therefore, when the membrane potential becomes more positive, this is called depolarization.
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the flour beetle has 10 chromosomes, roughly equal in size, and it also has eight hox genes. if the eight genes were randomly distributed throughout the genome of the beetle, what is the probability that all eight would land on the same chromosome?
First Hox can land on any chromosome
The probability second Hox lands on the same chromosome are 1/10.
Probability third lands on the same chromosome = 1/10, etc
Probability all eight land on same chromosome = (1/10)^7 = 0.0000001
When genes are close together on the same chromosome, it is called linkage. This means that alleles or gene versions that already exist together on the chromosome are more often inherited as a unit. These observations led to the concept of genetic linkage. This explains how her two closely related genes on the same chromosome are often inherited together.
The closer two genes are to each other on the chromosome the more likely they are to be inherited or linked together. Crossovers between two genes that are next to each other on the chromosome are very rare. If there is no crossover, the product is the parent gamete. A recombinant gamete is the result of a cross. Structural changes can occur in any cell during egg or sperm cell formation, during early fetal development, or after birth.
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2. This gemstone has a range of purple colors:
Oamethyst
garnite
Oturquoise
O jade
O peridot
This gemstone has a range of purple colors is amethyst.
What is amethyst?Amethyst is a violet variety of quartz. Amethyst, also known as Jamunia, is one of the most well-known substitutes for blue sapphire. Amethyst is a violet quartz variety. The name derives from the koine Greek o amethysts, from - a-, "not" and methysko / method, "intoxicate," a reference to the belief that the stone protected its owner from intoxication. Amethyst, also known as "the all-purpose stone," is a protective stone that aids in the relief of stress and anxiety, as well as the symptoms that accompany it, such as headaches, fatigue, and anxiety. It also helps with cell regeneration (which supports your bones and joints) and is said to improve your skin.To know more about amethyst, refer
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Explain whether you think the most important advances of the 21st-century will be new sources of energy or a more efficient use of source they already exist
Throughout the opinion, new energies will become more important because they produce less pollution than currently used energy sources and because the careless use of non-renewable energy sources could result in a future energy shortage.
Non-renewable Energy- Energy content of non-renewable materials is high. Compared to renewable energy sources like solar or wind, resources like coal and oil generally give us more energy. Coal mining, oil sales, and the building of pipelines for natural gas can all result in enormous riches.
The time-consuming nature of non-renewable fuel is one of its main drawbacks. It takes a long time to mine coal, look for oil, install oil drills, construct oil rigs, insert pipes to extract natural gas, and transport it. It also demands a great deal of work.
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e. coli in the lab grows with a doubling time of approximately 20mins. e. coli in your gut has a doubling time of approximately 12-24hrs. what variables might be influencing the rate of growth of e. coli?
Nutrients, pH, temperature, and dissolved enzymes might influence the growth rate of e. coli.
What is growth of bacterial ?
Binary fission, a process that causes bacteria to divide into two daughter cells, is the basis of bacterial growth. The daughter cells that result are identical genetically to the original cell, assuming no event takes place. As a result, bacteria start to grow. Not always do the two daughter cells from the division live. However, the bacterial population experiences exponential growth if the average number of survivors exceeds unity. The basic method requires bacterial enumeration (cell counting) by direct as well as individual, direct as well as bulk (biomass), indirect and individual (colony counting), as well as indirect and bulk (most probable number, turbidity, nutritional uptake) methods. This measurement of the an exponential bacterial growth curve in batch culture has been traditionally a part of the training of all microbiologists. Models bring theory and measurements into harmony.
E. coli bacteria typically dwell in the intestines of healthy humans and animals. Most E. coli strains are innocuous or only produce mild diarrhea.
What are the six elements that have an impact on bacterial growth?
Some of the most crucial elements that affect bacterial proliferation include the ones listed below:
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which of the following statements is false? in its interaction with hemoglobin, oxygen is: i. a prosthetic group. ii. a ligand. iii. bound at the 6th coordination position of the fe(ii) ion in the heme. iv. homoallosteric effector. v. reversibly bound.
The statement "In its interaction with hemoglobin, oxygen is a prosthetic group." (i) is false.
Each 's iron atom may attach to one oxygen molecule, enabling hemoglobin heme group to carry four oxygen molecules. Each heme group's iron atom may bind one oxygen molecule, giving hemoglobin its maximum ability to carry four oxygen molecules.
A unique non-protein element called a prosthetic group is necessary for some proteins to function. It is firmly attached to proteins. A prosthetic group can naturally take the shape of an organic lipid, vitamin, or sugar or an inorganic metal ion.
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what are the 4 Chambers of heart?
Answer:
The four chambers of the heart are the two upper and two lower chambers.
Explanation:
The four chambers of the heart are the two upper and two lower chambers.
The upper chambers are the right atria and the left atria, and the two atrias receive blood. The lower chambers are the right and left ventricles, and the two ventricles pump blood out of the heart.
Answer:
The heart is divided into two parts atrium and ventricle. We have left atrium, right atrium, left ventricle and right ventricle.
in the absence of the carbohydrate a, genes x and y are expressed at low levels. when a is introduced, genes x and y are actively transcribed. when the supply of a is exhausted, the expression of x and y drops to very low levels. from this, we can conclude that a is a(n)
In the absence of the carbohydrate a, genes x and y are expressed at low levels. when a is introduced, genes x and y are actively transcribed. when the supply of a is exhausted, the expression of x and y drops to very low levels. from this, we can conclude that a is a(n) inducer.
A substance that controls the expression of genes is known as an inducer in molecular biology. An inducer works in two different ways, namely:
1. By turning off the repressors. An inducer binds to the repressor, which causes the gene to be expressed. The repressor cannot bind to the operator because of the inducer's binding to the repressor. The transcription of operon genes can then start by RNA polymerase.
2. By attracting activators. Absent an inducer, activators often bind activator DNA sequences weakly. The complex formed by the binding of the activator and inducer to the activation sequence activates the target gene. Transcription is halted by removing the inducer.
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which of the following features of vancomycin distinguishes it from most other cellular peptides? choose one or more: a. a massive seven-module enzyme is required for glycosylation, chlorination, and side-chain linking of the precursor heptapeptide. b. the heptapeptide backbone is synthesized independently of a ribosome. c. it includes unusual amino acids not normally found in proteins. d. its synthesis requires a modified genetic code. e. some amino acids are present in the d-form rather than the l-form.
The features 'the heptapeptide backbone is synthesized independently of a ribosome, it includes unusual amino acids not normally found in proteins and some amino acids are present in the D-form rather than the L-form' distinguish vancomycin from most other cellular peptides (Options b, c and d).
What is a cellular peptide?A cellular peptide can be defined as any peptide that contains different amino acid residues and plays diverse functions inside the cell.
Vancomycin is a cellular peptide that is not completely synthesized in the ribosome (the protein factory of the cell) becuase it is an antibiotic and whose shape may have different tautomeric conformations according to the molecular function.
Therefore, with this data, we can see that vancomycin is a cellular peptide that is not produced in a whole manner in the ribosomes of the eukaryotic cells and may have different functions as well as distinct tautomeric structures.
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a double-reciprocal plot of 1/v0 versus 1/[s] for an enzyme in the presence of increasing concentrations of an uncompetitive inhibitor will have lines corresponding to the different inhibitor concentrations that are best described by which statement?
The statement "(B) The lines will cross the y-axis and will be parallel to each other." is what best describes a double-reciprocal plot of 1/v0 versus 1/[s] for an enzyme in the presence of increasing concentrations of an uncompetitive inhibitor.
Taken together, the reciprocals of both sides of the Michaelis-Menten equation yield the double-reciprocal equation. Plotting the inverse starting velocity (1/V0) as a function of the inverse of the substrate concentration (1/[S]) yields the double-reciprocal plot, sometimes referred to as the Lineweaver-Burk plot.
A straight line is created, allowing for the precise determination of the Vmax and, by extension, the precise determination of KM.
You can view the double reciprocal plot that illustrates non-competitive inhibition in the accompanying image. Because the inhibitor can only bind to the enzyme substrate complex, this non-competitive inhibition is distinguished by this property.
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Question correction:
A double-reciprocal plot of 1/V0 versus 1/[S] for an enzyme in the presence of increasing concentrations of an uncompetitive inhibitor will have lines corresponding to the different inhibitor concentrations that are BEST described by which statement?
A) The lines will intersect at the x-axis to the left of the y-axis.
B) The lines will cross the y-axis and will be parallel to each other.
C) The lines will intersect to the left of the y-axis but above the x-axis.
D) The lines will intersect below the x-axis, to the right of the y-axis.
E) The lines will be parallel to each other but will not cross the y-axis.
One molecule of glucose is broken down into two pyruvate molecules.
A. cellular respiration
B. glycolysis
C. photosynthesis
Answer:
B
Explanation:
What type of transport does this diagram show?
The type of transport shown is diffusion, a form of passive transport.
What are the forms of transport in living organisms?In living organisms, the transport of molecules is essential for survival of the living organism.
Molecules are transported from where they are produced to where they are needed in the body. Also, waste products of metabolism need to be removed from the cells to the excretory organs.
The two types of transport in a living organism are:
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how does a mass extinction event affect biodiversity on the earth? choose one: a. mass extinctions of minimal effect on the diversity of life. b. mass extinctions increase the diversity of life. c. mass extinctions decrease the diversity of life. d. mass extinctions have no effect on the diversity of life.
A mass extinction event affects biodiversity on the earth as during the time of extinction there is a rapid decrease in the diversity of life.
At a basic level, mass extinctions reduce diversity by killing specific lineages, and along with them, any descendant species they might have given rise to.
But mass extinction can also play a pioneering role in evolution, sparking the growth of other branches. Mass extinctions, by removing so many species from their ecosystems in a short time, reduce competition for resources and leave behind many uninhabited niches, which sustaining lineages can evolve into.
In the past half-billion years, Earth has been hit again and again by mass extinctions, eradicating most species on the planet. These events were devastating.
But life bounced back and the recovery was speedy.
The marking of recovery and diversification happened after every mass extinction.
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what is the purpose of corridors? multiple select question. to connect a natural habitat area to smaller habitats that are already protected to limit the range of species within a designated park to allow populations to expand into new breeding territory to effectively create a large reserve from several small ones
To connect a natural habitat area to smaller habitats
What is use of corridors?
A corridor is a type of hallway or gallery that often has a narrow width relative to its length and serves as a passageway connecting various architectural components. Entryways to rooms are frequently located along a corridor.
Common Corridor refers to a portion of the Infrastructure that was used by the End User for the Train Services for which Access Rights are being reclaimed and will also be used by the Train Services of the new Access Holder; Samples 1 through 3 are examples of common corridors.
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