Answer:
The correct answers: B, C and D.
Explanation:
X-ray diffraction studies of the DNA reveal the following:The DNA is comprised of two strands which are coiled around each other in the shape of a helix.The backbone of the DNA is made up of phosphate and deoxyribose groups, alternately, which are exposed towards the outside of the helix.The nitrogenous bases which form the hydrogen bonds that link the two helices are directed towards the centre of the helix.The atomic and molecular arrangement of the compound subjected to the X- rays can be defined by using the X-ray diffraction method.
The photograph enabled Watson and Crick to develop their DNA molecule structure and revealed:
Option B. The DNA strands are twisted around each other. Option C. There are two strands in the DNA molecule. Option D. The nitrogenous bases are near the centre of the DNA molecule.This can be explained as:
The DNA fragment comprises two antiparallel strands.They are in a twisting style and form a helical formation.The DNA molecule includes sugar, nucleotide and phosphate in alternative styles in helical formations.The phosphate and the sugar are projected to face outwards, while the nitrogenous bases face inwards.Therefore, DNA is a double helical arrangement with two antiparallel strands containing nitrogenous bases, sugar and phosphates.
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What is an important difference between an everyday theory and a scientific
theory?
A)A scientific theory is the same thing as a hypothesis.
B)An everyday theory is the same thing as a hypothesis.
C)A scientific theory does not have large amounts of evidence
supporting it.
D)An everyday theory does not have large amounts of evidence
supporting it.
Answer:
D
Explanation:
An everyday theory is known not to have large amounts of evidence supporting it.
It seems similar to a hypothesis only that in Science, a hypothesis leads to a test while an everyday theory can be a final say on an occurrence.
Answer:
Sample question: An everyday "theory” is a guess or hunch. A scientific theory is a reliable explanation that is supported by facts gathered over time through repeated observation and experimentation.
Explanation:
For plants and other organisms to develop differences among their respective species the alleles of their genes must contain variations. What is the original source of these variations?
A) Mutation
B) Crossing over
C) Random fertilization
D) Independent assortment
A) Mutation is the original source of variations for plants and other organisms which develops differences among their respective species
Explanation:
Genetic variation leads to the natural differences between each individual and among individuals of a species. The main cause for this variation is due to alleles that cause variations in the composition of genes or the DNA sequences.
A mutation is a genetic variation which leads to the creation of a new allele in a species population. Each variation in the DNA sequence leads to an allele formation and each allele leads to a difference in character or trait between individuals since they are the alternate version of the original genes.
Although genetic variations could be brought about by crossing over, random fertilization, or independent assortment; mutation is the original source because it provides the basic raw material for all the evolutionary changes.
Answer:
A
Explanation:
Which kind of worm is sometimes used to prevent blood clots? A.planarian B.leech C.fluke D.hookworm
Answer:
b leech
Explanation:
Answer:
The answer is B
Explanation:
It is B because leeches suck our blood so when a blood clot appears ( a gelatinous mass of fibrin and blood cells formed by the coagulation of blood ) They can fix it by sucking our blood.
Why are rapidly occurring environmental changes more likely to cause extinctions than slowly occurring changes?
Slow changes allow time for adaptation.
Rapid changes require little adaptation.
Slow changes affect only small regions.
Rapid changes have a global effect.
Answer:
slow changes allow time for adaptation
Explanation:
Do any that you can please!
Answer/ Explanation:
Punnett squares attached.
1. A.The punnett square shows the cross between two Ff heterozygous plants. The resulting plants are 25% FF, 50% Ff and 25% ff. This means that there are 25% red, 50% pink, 25% white.
B. In a population of 200 plants, we would expect 50 red, 100 pink, and 50 white.
2. A. The punnett square shows a cross between two Zz heterozygous mice.
B. If there is a phenotype missing from the offspring, we can assume that for some reason the genotype is lethal. That means that we can't see any with the phenotype because none of them survive past birth. Therefore, the third coat colour could be lethal.
4. Punnett square attached.
Genotype of a heterozygous black coated rabbit is CBc
Genotype of a homozygous white coated rabbit is CWCW
The genotypes and phenotypes of the offspring are CBCW (black and white spotted), CWc (white), CBCW (black and white spotted), CWc (white)
5. Punnett square attached.
Lets say that the hemophilia allele is h and the normal allele is H. Mrs Eryth is XHXh, Mr Eryth is XHY. The genotypes and phenotypes of their children are: XHXH (normal non-carrier female), XHXh (normal but carrier female), XHY (normal male), XhY (affected male)
What does dormancy mean
Answer:
dormancy is the state of having functions slowed down for a period of time.
4. What determines muscle strength?
Answer:
Having more fast-twitch muscle fibers is one factor that contributes to muscle strength. Another factor that determines strength is muscle mass. People with larger muscle cross-sectional areas can generate greater amounts of force. This should come as no surprise.
Explanation:
NEED HELP ASAP!!!!!!
Heat is distributed through the atmosphere by winds
True
False
The geosphere includes only the rocks sitting on the surface of the planet.
True
False
A tropical storm is an example of what two spheres of the earth interacting?
A.atmosphere and hydrosphere
B.geosphere and cryosphere
C.biosphere and atmosphere
D.cryosphere and atmosphere
The biosphere includes all of the fish that are in the ocean. Even though the ocean is part of the hydroshere.
True
False
The atmosphere controls and distributes heat.
True
False
One way the geosphere could affect the atmosphere is?
A. The oceans evaporate
B. a rock falls off a cliff
C. rain runs down a mountain and into the river which eventually makes it's way to the ocean.
D. A volcano erupts and throws gas into the atmosphere.
Answer:
false
Explanation:the small winds wehave down here dont effect the atmosheres heat the atmoshere is burning hot regardless.
Asthma is a condition in which a person’s airway becomes inflamed and produces extra mucus. One of the symptoms of an asthma attack is hyperventilation, or rapid breathing. Review the image and explain why asthma would cause this symptom.
the reason why asthma could cause this symptom is because the asthmatic bronchiole is much narrower than the normal bronchiole, and it's filled with mucus. If there isnt a sufficient amount of air getting through the lungs for gas exchange, the person will need to have heavier breaths to compensate.
Answer:
The asthmatic bronchiole is much narrower than the normal bronchiole, and it’s filled with mucus. If enough air does not get to the lungs for gas exchange, the person will need to breathe heavily to compensate.
Explanation:
PLATO answer
what’s the difference between a dominant allele and a recessive allele
Answer:
key difference between dominant and recessive alleles is that dominant alleles are the alleles that give the phenotype, masking over the other phenotype, while recessive alleles are the alleles that are suppressed by the dominant allele.
Explanation:
Final answer:
A dominant allele is expressed in an organism's phenotype even if only one copy is present, while a recessive allele is only expressed if two copies are present. This expression pattern determines the visible traits, with dominant alleles masking recessive ones in heterozygous individuals.
Explanation:
Difference Between Dominant and Recessive Alleles
The main difference between a dominant allele and a recessive allele lies in their expression in an organism's phenotype. A dominant allele is always expressed in the phenotype even if just one copy is inherited. In contrast, a recessive allele can only be expressed in the phenotype if two copies are present. This means that in a heterozygous individual (one who has different alleles at a particular gene locus, such as 'Aa'), the dominant allele (A) will mask the expression of the recessive allele (a).
As an example, if we consider the ABO blood group system, an individual inheriting one allele for blood type A and one for blood type O will have the blood type A because A is dominant over O. Meanwhile, for a person to have blood type O, a recessive trait, they must inherit two O alleles.
It is important to understand that dominance does not imply superiority or higher frequency in the population but simply reflects the mechanism of inheritance and expression of certain characteristics. Indeed, the same allele can be dominant in relation to one allele and recessive to another, illustrating the context-dependent nature of these terms.
What two types of cells contain chloroplasts?
Answer:
The two types of cells those contain chloroplasts are plant cells and algae.
Explanation:
Chloroplasts are double membrane bound cell organelles of plant cell which has envelope, stroma and lamellar system. It is found in green plants and algae as a photosynthetic apparatus. It contains chlorophyll which is a photosynthetic pigment that receives the energy from sunlight to converts it into the energy molecules called ATP. The shape of chloroplast is variable ; most common is discoid.Final answer:
Plant cells and algal cells are the two types of cells that contain chloroplasts, which are organelles responsible for photosynthesis.
Explanation:
Two types of cells that contain chloroplasts are plant cells and algal cells. Chloroplasts are special organelles where the process of photosynthesis takes place, using chlorophyll to convert solar energy into chemical energy in the form of glucose, which serves as food for the plant. In addition to plant cells, some groups of eukaryotes called algae also contain cells equipped with chloroplasts. Like plant cells, algal cells can have one or more chloroplasts, which are important for their photosynthetic activities.
Photosynthetic cells in plants are typically found in the mesophyll, the middle layer of cells in leaves. In aquatic environments, algae harness light energy with the help of chloroplasts as well. The presence of chloroplasts is fundamental to these organisms, as it allows them to produce their own food through photosynthesis, defining their role as autotrophs within ecosystems.
how are genes expressed for a particular trait.
Answer:
how are genes expressed for a particular trait?
Genes are expressed in two ways which could be either genotype or phenotype
genotype reflects the dominancy or recessives of a particular trait over another while phenotype entails the physical expression of such trait which could be height, color of skin among others
e.g
If P is purple while p is white
PP x Pp= PP, Pp, PP. Pp these are the genotype produced from the crossing of two parents which results into 2 homozygous gene and 2 heterozygous gene without any recessive gene
while the phenotype shows that all the offspring are Purple
Explanation:
Phosphate Group
Nitrogenous Base
Pentose Sugar
molecule. What is it the monomer of?
Answer: Nucleotide
Explanation: It is a monomer composed of the following parts: a phosphate group, a nitogeneous base either ( A,G,C,T) and a pentose sugar.
PLEASE HELP
Read the passage and answer the following question.
Antibiotics are drugs used to treat bacterial infections. This class of drug was first developed in the 1920s. At that time, infectious diseases were the leading cause of death worldwide. Within two decades of the introduction of antibiotics, almost every major bacterial disease could be effectively cured with an antibiotic. In the late 1960s, Surgeon General William Stewart reported to Congress that infectious diseases would soon be a thing of the past. Little did he know that the process of natural selection would soon prove his words false.
As antibiotics were dispensed for practically every ailment, some bacteria developed mutations that allowed them to become resistant to specific antibiotics. Through natural selection, these bacteria rapidly multiplied and spread, effectively neutralizing the effectiveness of one antibiotic after another. Today, strains of bacteria that cause tuberculosis, staph infections, and other infectious diseases are almost completely untreatable with antibiotics. Experts predict that the problem will continue to grow and can only be held in check by the discovery of new drugs.
Using evidence from this passage explain how bacteria provided an example of natural selection.
The bacteria which had mutation became resistant to the antibiotic and survived and keeps on increasing, promoting natural selection.
Explanation:
The bacteria rapidly divide, the chances of mutation in the gene increases manifold.
The strains of bacteria causing tuberculosis and staph infection got mutated at DNA level such that they became resistant to antibiotics when tested those susceptible did not survive. These mutations were not harmful to bacteria and the resultant bacteria survived.
These bacteria which survived and proliferated as the environment was in their favour.
Thus, Darwin's Theory of Natural Selection is acceptable here as it says if a mutation is occurring towards the increase in population, they will be selected ones.
help asap Which of the following is a decomposer?
whale
dog
vulture
fungus
Answer:
fungus
Explanation:
Among the options provided, a fungus is the decomposer.
In nature, decomposers play a critical role in recycling nutrients. They break down the remains of dead organisms and organic waste. Among the given options:
A whale is not a decomposer; it is a consumer.A dog is also not a decomposer; it is another type of consumer.A vulture is a scavenger, not a decomposer. While it eats dead organisms, it does not break down organic matter into simpler molecules.A fungus, however, is a true decomposer. It secretes digestive enzymes to break down dead organic matter externally, allowing it to absorb nutrients. For example, fungi can decompose tough materials like wood fibers, recycling nutrients back into the ecosystem.Therefore, the correct answer is fungus.
What the central idea of against all odds Earths fragile pioneers
Answer:
The central idea of "Against all odds: Earths fragile pioneers" is how Hawaii which is the most isolated island group on earth slowly was colonized by plants and animals.
Explanation:
Despite Hawaii's seclusion from the world, life got there through three means: wind,wings and water.Insects and seeds travel on birds that migrate or flee storms.Jet stream causes wind to move from Asia to Hawaii carrying seeds.And sometimes insects like cricket, and various seeds like hala reached Hawaii floating on the ocean.All these organisms faced harsh conditions, adapted and and now colonize Hawaii.Answer:
he Hala seeds can float in the ocean for so long because they have a blanket of spongy material, which help is Hala seeds float. I know this because in the text it says “How do its seeds survive the salty ocean? They are snuggled in a blanket of spongy material, which can float in the sea for months or even years. A species of Hawaiian crickets rafted in on pieces of floating wood. This supports the central idea because it shows how difficult it is for the colonize to get to Hawaii.
Explanation:
The heat from the Sun reaches Earth through convection.
Please select the best answer from the choices provided
T
F
Answer:
false 100%
Explanation:
Question 7 of 25
2 Points
The graph shows ice core data that illustrate historical trends in the amount
of carbon dioxide in Earth's atmosphere. Scientists attribute global warming
to recent increases in human activities that produce carbon dioxide. How
could scientists use these data to evaluate whether a new solution to the
problem of global warming is working?
Atmospheric Carbon Dioxide
from Low Dolce Cores
Atmosphere Com)
1000
1200
1400 1600
Year (AD)
1800
O
O
A. By comparing historical atmospheric CO2 levels with data from
another planet
B. By gathering more data about historic atmospheric CO2 levels
using a different technique
C. By gathering new data about historic atmospheric Co2 levels
using new ice cores
O
O
D. By comparing modern atmospheric co, levels with historical data
in the graph
Answer:
BY comparing modern (today's) atmospheric CO2 level with historical (past) data in the graph.
Explanation:
Completed the test
By contrasting the current atmospheric CO2 levels with the historical data shown in the graph, scientists might utilise these data to determine if a new approach to the issue of global warming is effective.
What is the impact of carbon dioxide in atmosphere ?This would enable them to ascertain if the new remedy is having an impact on CO2 levels in the atmosphere. Scientists may determine if the new solution is having an effect on the quantity of CO2 in the atmosphere by comparing the levels of atmospheric CO2 at now with those in the graph.
Scientists might also use fresh ice cores to collect new information about previous atmospheric CO2 levels in order to better assess the efficacy of the new approach. This would enable them to contrast present atmospheric CO2 levels with earlier ones.
The new approach was put into practise. If the new remedy is having an impact on the level of atmospheric CO2, scientists can tell by comparing the data from the fresh ice core samples with the data from the graph. Finally, researchers may contrast current atmospheric CO2 levels with information from other planets.
This would enable them to establish whether the new remedy is affecting the level of atmospheric CO2 globally. Scientists may evaluate if the new solution is having a beneficial impact on the quantity of atmospheric CO2 on a global scale by comparing the data from Earth with the data from another planet.
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What is instantaneous speciation?
an interdependent relationship between two or more species
a type of speciation that only occurs on islands
the formation of a new species over a few generations
a type of speciation that leads to rapid extinction
Explanation:
This is a type of speciation where new species are produced which are separated from the parental individual by biological or geographical barrier.This type of speciation occur among individual and not in a population.It is a kind of sympatric speciation which is caused by poliploidy.Many ecosystems on Earth have evolved to depend on occasional wildfires that maintain the diversity of the ecosystem. These ecosystems are known as fire dependent ecosystems.
Which of the following best describes how wildfires can be beneficial to certain ecosystems?
Answer:
It can burn branches and clear wood from the forest floor.
Explanation:
This provides space for growth.
Answer:
A fire in a forest ecosystem can burn low branches and clear dead wood from the forest floor, providing space for new growth.
Explanation:
Phosphate sugar base what molecule is that?
Answer:
nucleotides
The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.
Explanation:
What was the control in Pasteur's experiment?
A.uncovered meat that had contact with air
B.a straight neck flask to allow air to get in
C.a swan neck flask that prevented air from getting in
D.meat sealed in jars that didn’t have contact with air
A swan neck flask that prevented air from getting in was the control in Pasteur's experiment. Therefore, option (C) is correct.
What is Pasteur's experiment?The experiment was designed to test the hypothesis of spontaneous generation, which proposed that living organisms could arise spontaneously from non-living matter. To test this, Pasteur used swan-necked flasks that allowed air to enter but prevented microorganisms from getting in. The flasks containing the nutrient broth were boiled to sterilize the contents and the curved neck of the flasks prevented dust and microorganisms from entering.
The control group in this experiment was the flask with the nutrient broth that was not exposed to the external environment. This flask was used as a comparison to the experimental group, which was a flask with the nutrient broth that was exposed to the external environment. By comparing the growth of microorganisms in the two groups, Pasteur was able to demonstrate that microorganisms do not arise spontaneously from non-living matter, but rather come from pre-existing microorganisms.
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Read the lines from “Twelfth Song of Thunder.”
The voice that beautifies the land!
The voice above,
The voice of the thunder
Within the dark cloud
Again and again it sounds,
The voice that beautifies the land.
Based on the content of this passage, what do the Navajo people believe?
Thunder is a powerful force that should not be underestimated.
Thunder is terrifying and one should not be outside when it crashes.
Thunder is a minor natural event that should really go unnoticed.
Thunder is astonishing and makes the land more wondrous.
Answer:
The correct option is D) Thunder is astonishing and makes the land more wondrous.
Explanation:
These lines from the "Twelfth Song of Thunder" shows that the Navajo people consider the voice of thunder as a blessing. They think that the way a thunder looks in the dark clouds and the voice that it makes is indeed astonishing and wondrous.
Answer:
D is the answer
Explanation:
your welcome [
definition of binomial nomenclature
Answer:
the system of nomenclature in which two terms are used to denote a species of living organism, the first one indicating the genus and the second the specific epithet.
Explanation:
Final answer:
Binomial nomenclature is a system of naming species with a two-part Latin name consisting of the genus name and species identifier. Developed by Carolus Linnaeus, it provides a unique and universally recognized name for each species, avoiding the confusion of common names and facilitating clear communication among scientists worldwide.
Explanation:
Binomial nomenclature is a formal system of naming species of living things by giving each a name composed of two parts, both of which use Latin grammatical forms, although they can be based on words from other languages. This two-part name is called a binomial (meaning "two names" in Latin). The first part of the name identifies the genus to which the organism belongs, while the second part identifies the species within the genus. For example, the scientific name for humans is Homo sapiens, where Homo is the genus and sapiens is the species identifier.
The Swedish naturalist Carolus Linnaeus is credited with developing binomial nomenclature in the 18th century, which revolutionized the way scientists named and classified organisms. It enabled clearer and more consistent communication among scientists from different regions and languages. When printed, the genus name is always capitalized and the species name is always lowercase, and both are italicized, for example, Felis catus for the domestic cat.
The convention of binomial nomenclature not only mitigates the confusion caused by local and common names but also provides each species with a unique and universally recognized name. This universal nomenclature facilitates accurate communication and information sharing among biologists and researchers across the globe.
What happens when the atmosphere interacts with the lithosphere?
Answer:
A
Explanation:
Gases are released from volcanic eruptions.
And took test (:
Below are the three main organs that make up the plant body.
The parts of a plant are labeled. The top green leaf part is labeled A. The stem is labeled B. The part that is underground is labeled C.
What is the main function of the structure that is identified as B in the picture above?
It anchors the plant.
It produces food.
It absorbs nutrients.
It supports the plant.
The answer isn't B. I think the answer is D.
I need help, please
The solution regarding the Mechanical waves and electromagnetic is discussed below:
The difference between the Mechanical waves and electromagnetic waves is Mechanical waves require medium and electromagnetic waves do not.The example which describes the production of a longitudinal wave and the motion of particles that transport in the waveform is a single pulse tone is sent from an underwater speaker through a pool of water and the water molecules are compressed in the direction of wave.The similarity between the em waves and mechanical waves are transfer matter over long distances.In a compression waves, the medium is displaced in the same direction. The light bulb can generate waves and travel through the vacuum. The unique properties of EM waves are amplitude and frequency.
A grown tiger began its life as a single fertilized egg. Which explains why a tiger
looks so much different as an adult than it did as a single fertilized egg.
All the genes are expressed.
Different genes are expressed at different times
Different cells have different genes.
As a tiger grows his genes change.
Answer:
As a tiger grows his genes change
Explanation:
Development from a fertilized egg to a mature organism depends on the expression of different genes at different times. In addition, gene expression can occur in different parts of the body at different times during development. As the fertilized egg begins to divide, different genes are either turned on or off. The activation of specific genes is the most important step in cell differentiation. As the tiger grows and develops, different genes are either turned on or off in the tiger’s various cells. This regulation is a key part of development and differentiation.
Where does the mitochondrial DNA originate?
Answer:
It originated in the nucleus’s
Explanation:
Due to the DNA origin.
What is the product of a DNA synthesis reaction?
Answer:
The product of the DNA synthesis reaction is that, from a DNA molecule, two identical molecules of this nucleic acid are obtained.
Explanation:
The DNA replication process involves a series of events that result in obtaining two DNA molecules with the same sequence of nitrogen bases relative to the original. This must occur previous to the process of cell division, so that each cell daughter possesses the same genetic information.
For this process to occur the double DNA chain must be unrolled and, from each of the simple chains a complementary chain is formed, by adding complementary nitrogen bases: adenine with thymine and cytosine with guanine. DNA synthesis is facilitated by the action of the enzyme DNA polymerase.
DNA synthesis is called semi-conservative, as each molecule obtained in the process has a simple chain, coming from the original molecule, and a new synthesized chain.
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Final answer:
The product of DNA synthesis is two identical DNA molecules, comprised of one original strand and one new strand. This replication process ensures genetic information is preserved.
Explanation:
The product of a DNA synthesis reaction is two identical DNA molecules, each consisting of one original and one newly synthesized strand. This process, known as replication, occurs within the nucleus of a cell during the S phase of the cell cycle. Enzymes such as DNA polymerase play a pivotal role in this process, 'unzipping' the original double helix to use as templates for synthesis. Free deoxynucleoside triphosphates (dNTPs) are aligned opposite their complementary bases on each template strand, and DNA polymerase catalyzes the addition of these nucleotides to the 3' end of the growing chain. Thus, each daughter DNA molecule is an accurate copy of the parent DNA, ensuring genetic information is preserved during cell division.