Enter your answer in the provided box. what is the value of ni for an electron that emits a photon of wavelength 95.04 nm when it returns to the ground state in the h atom?
You can determine initial value of 'n' for a photon of a given wavelength during electron transition, using Rydberg formula, with the final state being the ground state of the hydrogen atom where n1 = 1.
Explanation:To calculate the value of 'n' for an electron that emits a photon of wavelength 95.04 nm when it returns to the ground state in the hydrogen atom, we need to use the Rydberg formula that relates the wavelength of light emitted by an electron transitioning between energy levels in a hydrogen atom:
1/λ = R * (1/n1² - 1/n2²)
Where, R = Rydberg constant = 1.097 x 107 m⁻¹, n1 and n2 are the principal quantum numbers of the initial and final energy states of the electron(m is the ground state), and λ is the wavelength of the emitted light.
Since the electron goes back to the ground state, n1 = 1, and we know the wavelength λ = 95.04 nm. The only unknown here is n2, which we can determine by rearranging and solving the equation.
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What type of rock would you form in this environment, showing a dried up lake bed?
Where do scientists obtain primers to be used in pcr and in this technique answer?
Existing strand of nucleotides we call primer.Synthesize DNA primers through specific sequences that bind to other sequences of a single-thread DNA molecule.
Where do primers come from in PCR?A primer must be synthesized by an enzyme called primase, which is a Kind of RNA polymerase, before DNA replication can occur.
The making of a primer is require because the enzymes that synthesize DNA, which are called DNA polymerases, only linked to new DNA nucleotides to an strand of nucleotides.
Thus, DNA primers through specific sequences that bind to other sequences of a single-thread DNA molecule.
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Final answer:
Primers for PCR are chemically synthesized by commercial vendors based on specific sequences provided by geneticists. Taq polymerase, used in PCR for its heat stability, is derived from Thermus aquaticus. RT-PCR involves converting RNA to cDNA prior to PCR amplification.
Explanation:
Scientists obtain primers to be used in Polymerase Chain Reaction (PCR) through chemical synthesis from commercial vendors. Primers are short, synthetic, single-stranded DNA molecules that are complementary to the regions flanking the target DNA sequence that needs to be amplified. To design these primers, the geneticist must know sequences that are adjacent to the target DNA region. Once the forward and reverse primers are designed, they are synthesized by the vendor to match the specific sequence required for the PCR process.
The commonly used Taq polymerase in PCR is a heat-stable DNA polymerase derived from the thermophilic bacterium Thermus aquaticus, which can withstand the high temperatures during the PCR steps. The enzyme's stability is essential since the PCR involves repeated heating and cooling cycles to denature DNA, anneal primers, and extend the DNA strands.
In the case of Reverse Transcriptase PCR (RT-PCR), cDNA is synthesized from an RNA template before the PCR begins, aiming to amplify RNA sequences by converting them into DNA.
Wind blown dust __________. can reach any part of the ocean may contribute to the formation of red tides is found as deep-sea red and brown mud far from land originates on land surfaces all of the above are correct.
What role do rocks have within the carbon cycle?
Rocks are the storage of carbon when recombines into minerals releasing carbon into the carbon cycle.
What is the carbon cycle?Carbon in the atmosphere is absorbed by plants to do photosynthesis, plants are consumed by animals, and this carbon accumulated in their bodies.
When an animal or plant dies this carbon is released again into the atmosphere. If not released back they become fossil fuels, and these fossil fuels are used by human activities, which pump back into the atmosphere.
It is a cyclic form where carbon interchanges between the biosphere, hydrosphere, pedosphere, and geosphere and into the earth's atmosphere.
Therefore rock weathering in the carbon cycle is important
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Describe the two methods suggested for projecting a nonstatistical sample result. how does an auditor determine which method should be used
Non-Statistical Sampling is the method of evaluation the competence of the evidence gathered from the auditor. Selected-sample size is referred to as non-statistical sampling. There are two acceptable methods used for projecting the amount of misstatements. They are ratio projection and difference projection.
Ratio projection is used in the non-statistical sampling and classical variable statistical sampling. It projects the misstatement amount by dividing the amount of misstatement and percentage of the dollars of the sample population.
Difference projection is defined as the average misstatements of each and every item in the sample to the overall population. This projection is executed when the misstatement is stable for the entire item, though its dollar size varies.
Results arrived from these two projections are identical, when the same proportion of items in the populations are incorporated in the sample. But, when different proportions are arrived at, then the choice between the two is based on the auditor’s judgment.
For water to travel across the cell membrane at a substantial rate the water molecules travel through protein channels known as aquaporins is what diffusion
What is the connection between the liver (organ), UV radiation (sunlight), and bone tissue? I need something with more information for an essay
which often is a result from great variations in a habitats abiotic conditions
Answer:
with competitive exclusion
Explanation:
Competitive extrusion is a concept created by Georgyi Frantsevich Gause, who states that each species has a specific ecological niche for that species. In this case, if one species has to divide this ecological niche into two or more species so that they coexist without interfering with each other's survival, large variations in abiotic habitat conditions will be necessary making it possible for the ecological niche to have different and sufficient characteristics. for each species.
What is a gametophyte?
A. A plant that produces gametes.
B. An animal that produces gametes.
C. A plant that produces spores.
D. An animal that produces spores.
During which phase of photosynthesis is atp and nadph synthesized? a. carbon fixation reactions b. glycolysis c. light-dependent phase d. citric acid cycle e. light-independent phase
Final answer:
ATP and NADPH are synthesized during the light-dependent phase of photosynthesis.
Explanation:
The synthesis of ATP and NADPH occurs during the light-dependent phase of photosynthesis. In this phase, light energy is captured by pigments in the thylakoid membrane of the chloroplasts, and used to convert ADP and inorganic phosphate (Pi) into ATP through a process called photophosphorylation. NADPH is also produced by transferring electrons from water molecules, which are split in a process called photolysis, to NADP+.
The mutagens that result in cancer damage DNA by (a) destroying the cells p53 gene directly thereby increasing cell production (b) weakening the DNA strand or interfering with base pairing (c) altering the cells pH and allowing increased cell productions (d) becoming a virus that attacks DNA directly l, impairing duplication
Answer:
It is b weakening the dna strand or interfering with base pairing
Explanation:
A management science technique usually applies to a specific model type.
a. True
b. False
Natural selection is a process by which the characteristics of a(n) __________ will change over time.
When a ball rolls down the hill, what energy is conserved?
A. Potential energy to chemical energy.
B. Potential energy to kinetic energy.
C. Chemical energy to kinetic energy.
D. Kinetic energy to potential energy.
In a small, isolated population of piranhas, one individual is born with a synonymous mutation in a gene that codes for hemoglobin. after five generations, 5% of the piranhas carry this mutation. what is a plausible explanation for this evolution?
Name an organelle that stores large amounts of calcium.
The plastid is a double-membrane organelle found in cells of different plants and algae. Plastids store and manufacture chemical compounds in the cell. This includes Calcium, which is stored as Ca-oxalate crystals. They can also store starch, which is used to produce energy.
A 10-month-old infant has begun to take his first steps and his mother has brought him for assessment because of swelling in his ankles and knees. the mother also states that he was eager to walk but has now regressed and cries when she tries to encourage it. the clinician should:
True-breeding red petunias are crossed to pure-breeding blue petunias, and all the f1 progeny have purple flowers. if the f1 are allowed to self-fertilize and produce the f2, what is the expected phenotypic distribution of the f2 progeny?
Final answer:
The expected phenotypic distribution of the F2 progeny when true-breeding red petunias are crossed with pure-breeding blue petunias, with all F1 having purple flowers, would be 75% purple flowers and 25% a mix of red and blue, under the assumption of incomplete dominance.
Explanation:
When true-breeding red petunias are crossed with pure-breeding blue petunias, and the resulting F1 progeny have purple flowers, this suggests that red and blue flower colors are co-dominant. Upon self-fertilization of the F1 progeny, we would expect to see a phenotypic distribution in the F2 generation that shows the effects of this co-dominance.
If red (R) and blue (B) are co-dominant alleles, the F1 generation will all be heterozygous (Rb), resulting in purple flowers. When these F1 plants self-fertilize, the F2 generation will have the following genotypes according to a Punnett square: RR (red), Rb (purple), bR (purple), and bb (blue). The phenotypic ratio would therefore be 1 red: 2 purple: 1 blue, or 25% red, 50% purple, and 25% blue.
However, it must be noted that if instead, one color is dominant over the other, and purple is the result of incomplete dominance, the phenotypic ratio of the F2 generation would show a different pattern. In that case, the ratio at the F2 generation would be commonly expected to be 1:2:1 according to Mendelian genetics, corresponding to 25% one parent color, 50% the blended color (purple), and 25% the other parent color.
Based on the historical context from Mendel's experiments with peas, where a similar pattern of inheritance was observed with purple and white flowers, the question suggests that the expected phenotypic distribution for the F2 generation would be 75% purple flowers and 25% a mix of red and blue flowers, assuming that the purple color is a result of incomplete dominance.
Name three major types of water pollutants, and provide an example of each. explain which classes of pollutants you think are most important in your local area.
Marble is a nonfoliated rock that forms when heat and pressure change limestone. Marble _____. is formed by evenly distributed pressure is a clastic sedimentary rock is an extrusive igneous rock has a banded, or layered, look
The correct answer is is formed by evenly distributed pressure.
A gene cannot react chemically and form a trait without the proper _____. molecule
enzyme
substrate
chromosome
A gene cannot react chemically to form a trait f the proper enzymes are not present. The formation of a trait from the gene is dependent on the expression of the gene. The gene expression is a process which involves the help of the various enzymes. The absence of any of these essential enzymes will make it impossible for the gene to express the trait for which it is coded.
Hence, the answer is 'enzymes'.
Answer:
A gene cannot react chemically and form a trait without the proper _____.
enzyme
Hot spot activity is unrelated tot he formation of iceland which sits atop a sea
Pogil what sections of the embedded protein chain are most likely to contain amino acids with hydrophilic r-groups
Amino acids with hydrophilic R-groups are most likely to be located on the surface of proteins and in the exposed regions of membrane-embedded protein chains. This arrangement allows these hydrophilic side chains to interact with the surrounding water-based environments, thus maintaining the structural stability of the proteins.
Explanation:In proteins, the sections that are most likely to contain amino acids with hydrophilic R-groups are at the surface of the proteins. This is due to the polar nature of these hydrophilic R groups. Consider the basic structure of an alpha helix and a ß-pleated sheet. In the alpha helix, there are 3.6 amino acid residues per helical turn, and the R-groups protrude outwards. The same applies to ß-pleated sheets, where 'pleats' formed by hydrogen bonding cause the R-groups to extend above and below the folds. The crucial part is, to maintain the stability of a protein, in the globular formation, the hydrophobic or nonpolar amino acids are usually located in the interior while the hydrophilic or polar amino acids are on the exterior. This arrangement permits the hydrophilic R-groups to interact with the surrounding aqueous environment.
For example, amino acids like serine, threonine, and cysteine, which are polar and have hydrophilic side chains, are frequently found on the protein's outer surface. Additionally, basic amino acids like lysine and arginine, with their positively charged side chains, also often occupy this surface position.
In membrane proteins, hydrophilic amino acids are often found in the regions of the amino acid chain that are exposed to the aqueous environment, either outside of the cell or inside the cytoplasm.
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"_____ is an unpleasant side effect that alcohol withdrawal creates for an alcoholic."
Children are likely to be most influenced by tv when:
Identify the features indicated in the sagittal section of the right half of the human brain
Final answer:
A sagittal section of the human brain reveals key structures like the cerebrum, cerebral cortex, corpus callosum, and the longitudinal fissure. It also shows the division into the frontal, parietal, temporal, and occipital lobes, each with specific functions.
Explanation:
The sagittal section of the human brain is a vertical cut that divides the brain into left and right halves. It can feature various brain structures such as the cerebrum, which includes the cerebral cortex, the white matter of the corpus callosum, and the longitudinal fissure that separates the cerebral hemispheres. The cerebral cortex itself exhibits folds called gyri and grooves called sulci, which help to increase the area available for neurons.
The cerebrum is further divided into four lobes: the frontal lobe, parietal lobe, temporal lobe, and occipital lobe, which are separated by different sulci such as the central sulcus and lateral sulcus. These lobes and their folds are responsible for various functions of the brain, ranging from sensory processing to decision making.
Draw a stress strain curve for a ductile material indicating yield stress, uts, strain to failure.
If a person has a deviated septum, what 2 bones could possibly be deformed?
The membrane that covers the outer surface of the eye and lines the eyelids is the ________.
The answer is conjunctiva. It is a mucus membrane that is responsible of covering the eye. It is comprise of stratified squamous epithelium and even stratified columnar epithelium that makes the stretchable when pulled and back to its original shape.