A section of three nucleotides beside one another is referred to as a?
A.Codon
B. Helix
C. Ribose
D. Anticodon
which question cannot be tested with a scientific investigation?
Are people who drink tea, happier then others who don't,, thats the answer.
Who is credited with creating the first accurate model of DNA?
A.Rosalind Franklin
B.Friedrich Miescher
C. James Watson and Francis Crick
D.Marshall Nirenberg and Heinrich Matthaei
Francis Crick and James Watson identified the double helical structure of DNA in 1953, illuminating the structural basis for DNA replication, hence option C is correct.
What is an accurate model of DNA?They proposed the three-dimensional model of DNA, which posits that two helical DNA strands wound around one another to form a double helix.
The alternating deoxyribose and phosphate groups attract the hydrophilic backbones that are present outside of the helix to the watery medium in the area.
The hydrophobic structure of the purine and pyrimidine bases is meant to be kept out of the water by the double helix.
Therefore, according to the Watson and Crick hypothesis, hydrogen bonds between guanine and cytosine and thymine and adenine allow for base pairing.
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What is a major threat to biodiversity
during transcription, is the original sequence maintained in the new strands? explain why or why not
During transcription, RNA polymerase synthesizes RNA complementary to DNA, maintaining sequence with modifications (e.g., T to U substitution).
1. During transcription, the original sequence of DNA is maintained in the newly synthesized RNA strands with certain modifications:
2. RNA polymerase binds to the DNA template and synthesizes a complementary RNA strand, following the rules of base pairing (A-U, G-C).
3. While the overall sequence is maintained, there are some differences:
4. Thymine (T) in DNA is replaced by uracil (U) in RNA.
5. Transcription may not cover the entire DNA sequence; only specific regions (genes) are transcribed into RNA.
6. Additionally, RNA processing, such as splicing and post-transcriptional modifications, can alter the final RNA sequence.
7. Despite these modifications, the essential information encoded in the DNA, such as the sequence of amino acids in a protein, is preserved in the newly synthesized RNA.
8. Therefore, while the exact nucleotide sequence is not identical, the fundamental genetic information is conserved throughout transcription.
name 2 reasons why oxygen was vital for the formation of living things
To survive on earth, oxygen is the single most vital element. You can survive for couple of days without taking nitrogen and hydrogen but you can’t survive without oxygen for more than few minutes.
Two main reasons which describe the importance of oxygen in the creation of living beings are:
- To generate energy in the form of ATP (Adenosine triphosphate)
- To form water (essential to conduct reactions in human body)
What would happen if guard cells in a plant stopped working?
A.
Diseases would quickly invade the plant.
B.
Photosynthesis would occur more slowly.
C.
Stomata would not open and close.
D.
Chloroplasts would change color.
When studying heredity, what is the relationship of DNA bases and traits?
In the study of heredity, the relationship between DNA bases and traits is crucial. DNA is made up of nucleotide base pairs, which determine the sequence of genes and the expression of traits.
Explanation:In the study of heredity, the relationship between DNA bases and traits is crucial. DNA is made up of nucleotide base pairs, which are the building blocks of DNA. Different combinations of these base pairs determine the sequence of genes, which in turn determines the expression of traits. For example, different alleles of a gene coding for hair color can result in individuals having different hair colors.
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please help
Which of the following is the most important factor in driving global thermohaline (conveyor belt) circulation?
A. changes in density
B. changes in wind direction and velocity
C. changes in gravity
D. changes in pH
Changes in density are the most important factor in driving global thermohaline circulation. This density change is mainly due to variations in seawater temperature and salinity, which in turn affect deep ocean currents and climate.
The most important factor in driving global thermohaline circulation, also known as the global conveyor belt, is changes in density. This deep ocean circulation is driven by differences in the density of seawater, which are primarily influenced by variations in temperature (thermal) and salinity (haline).
The process works as follows: Warm, salty surface water travels to the North Atlantic where it cools and increases in density, causing it to sink into the deep ocean. This newly formed deep water then moves southward and dense water also sinks near Antarctica. Over time, as this cold, dense water gradually warms, it returns to the surface in a slow-moving system that circulates water globally, greatly influencing Earth's climate by transporting heat.
Factors such as heat fluxes, evaporation, rain, and the freezing and melting of sea ice alter the distribution of temperature and salinity at the ocean's surface, thus impacting the density-driven thermohaline circulation.
Which of the following instruments focuses light through two lenses at once to magnify a cell?
Compound microscope
ORRR
Electron microscope
Answer:
Compound Microscope
Explanation:
Compound magnifies the image by focusing light through both lenses at the same time, magnifying a cell in the process.
This means to move around. An organism must do this to find food, shelter, and space.
pips these here is science
A species of gray wolf was eliminated from a national park because of unrestricted hunting. As a result, there was a tremendous increase in the population of its prey, the elk. The populations of other herbivores also increased. What imbalance might this situation have on the ecosystem?
A.There will be a steep increase in the number of producers in the national park.
B.The increase in the prey population will result in overgrazing, causing a decline in woody plant species.
C.The population of other predator animals will decrease.
D.The ecosystem will remain largely unaffected.
Which of the following statements describes how you would classify Figure 28.2 as a negative feedback loop?
a
The control center counteracts change from a set point.
b
The sensors notice an increase away from a set point.
c
Nerves and hormones carry messages to target organs.
d
A target organ receives and responds to a message.
the answer is a. When the heart rate is too high, the body sends hormones that continually increase the heart rate higher.
can someone help me?
The graph above was made by a South American biologist in the country of Brazil, after a long study on parrots. About 200 years ago, 90% of Brazil was covered in mature, deep forest. Today, well over half of this forest has been cut to make way for farms. What conclusion could you draw about the parrots in the graph?
A) Red parrots have become less common in the last 200 years.
B) There are probably less green parrots today than there once were. C) Blue parrots probably are the best adapted species to live on farms. D) The blue parrot population has likely increased in the last 200 years.
Answer:
The correct answer is B) There are probably less green parrots today than there once were.
Explanation:
The graph shows that most of the green parrots live in the deep forest region. The cutting of the deep forest would destroy their habitat and due to the lack of habitat the green parrots would eventually decrease.
As the question says, half of the deep forest is cut, so, the number of green parrots must be declined in that area.
Some inquisitive students found two slugs and wanted to take them to science class. The only container they could find was a used potato chip bag. The students stored the slugs in the bag to take to school the next day, When the students opened the bag at school, they found that the slugs had melted and turned to slime. Why did this happen?
A) The slugs had an defensive reaction to the salt, and the slime was a response to that reaction.
B) The salt around the slugs created a hypotonic environment, which caused water to diffuse into cells and made them undergo cytolysis.
C) The salt around the slugs created a hypertonic environment, which caused water to diffuse out of cells and made them undergo plasmolysis.
D) The salt around the slugs created an isotonic environment, which caused water to diffuse out of and into the cells which made the slugs melt.
C) The salt around the slugs created a hypertonic environment, which caused water to diffuse out of cells and the cells will shrink.
What’s the role of oxygen in cellular respiration? Help please ASAP
Answer:
The letter A is the right answer.
Explanation:
Cellular respiration occurs in the presence of oxygen. This element is essential in the cellular respiration process, since it is responsible for accepting electrons and keeping the electron transport chain functioning.
Cellular respiration occurs after glycolysis, where pyruvate is formed along with 2 molecules of ATP. In the presence of oxygen, pyruvate is oxidized to a two-carbon compound that will react with co-enzyme-A and form NADH and CO2. This process will start the electron transport chain that will result in a protonic gradient that will transform ADP into ATP. The electron receptor in this process is oxygen, which will later be combined with hydrogen molecules to form water.
In cellular respiration, oxygen acts as the final electron acceptor in the electron transport chain. It combines with electrons and hydrogen ions to create water, facilitating the creation of ATP, the cell's primary energy source.
Explanation:Oxygen plays a critical role in the process of cellular respiration, a process used by cells to convert glucose into ATP (Adenosine triphosphate), which provides energy for the cell's activities. During cellular respiration, oxygen is used in the final stage called the electron transport chain. Here, oxygen acts as the final electron acceptor, combining with electrons and hydrogen ions to produce water. This process creates a gradient that powers the creation of ATP, the cell's primary energy source. Without oxygen, many cells can't create ATP efficiently.
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What are all of the the types of weather fronts
If fish populations in the Antarctic were to decline, what would be the best way for the smaller toothed whales to adapt?
Question 5 options:
eat more baleen whales
eat more penguins
eat more phytoplankton
eat more leopard seals
Answer:
Beat more baleen whales
Explanation:
Smaller toothed whales are secondary
consumers of fish. If the fish population declined, the populations of leopard
seals, elephant seals, and penguins; animals which make up a large portion of
the whales' diet; would likely also decline.
To survive, the smaller toothed whales would have to eat more animals that feed
primarily on krill instead of fish, such as seals (not leopard or elephant
seals) and baleen whales.
Answer: B
Explanation:
Describe the activity of chromosomes in each stage of meiosis 1 and meiosis 2
( so chromosomes can move around)
Metaphase- Chromosomes line up in the middle of the cell
Anaphase-*Chromosome copies pull apart from each other.
Telophase-*Nuclear division has finished and nuclear membrane reappears
This is the process for Meiosis 1 not for 2 (FYI)
The study of the similarities and differences between embryos of different organism
What makes plants the beginning of the food chain?
A. Plants store chemical energy as glucose
B. Only plants use solar energy in a chemical process to produce food
C. All organisms eat plants
D. Plants make food for other organisms.
Discuss the importance of oxygen to all living organisms, and describe how three different organisms—human, flatworm, and fern—obtain the oxygen they need.
Oxygen is essential for aerobic organisms, and humans, flatworms, and ferns have evolved different methods to obtain it: humans use lungs, flatworms rely on diffusion through their skin, and ferns utilize stomata on their leaves for gas exchange.
Explanation:Oxygen is crucial for the survival of all aerobic organisms as it is essential for carrying out metabolic functions. Different organisms have evolved various mechanisms for obtaining oxygen, depending on their size, shape, and habitat. Larger organisms require specialized respiratory systems due to the increased diffusion distance and the decreased ratio of surface area to volume that comes with a larger body size.
Humans obtain oxygen through their well-developed respiratory system which includes the lungs and respiratory passages. Oxygen is inhaled into the lungs, where it diffuses into the bloodstream and is then transported throughout the body.
Flatworms have a simple body plan that allows for oxygen to be obtained directly through diffusion across their skin, suitable for their small size and flattened shape.
Ferns, being plants, use their leaves to absorb oxygen from the air at night and also produce it during the daytime via photosynthesis. They have pores called stomata that open and close to regulate the intake of carbon dioxide and the release of oxygen.
The Healing Of A Wound In A Human Is Most Similar To The Process Of
The healing of a wound in a human is most similar to the process of regeneration.
The following information should be considered:
Regeneration is the natural process of replacing or restoring damaged or missing cells, tissues, organs,etc. Also, even entire body parts to full function in plants and animals.So it should be equivalent to one another.Learn more: https://brainly.com/question/537797?referrer=searchResults
What is being done to prevent oil spills?
Measures to prevent oil spills include stricter shipping regulations, such as requiring double-hull liners, and managing spills using technologies like skimmer ships and dispersants.
To prevent oil spills, several measures have been implemented. These include stricter regulations for oil transport, like mandating double-hull liners in new ships to protect against spills, which dropped the amount of oil spilled from ships significantly during the 1990s. There are also enforcement measures against land-based leaks, such as those from filling up gas tanks, improper disposal of motor oil, and leaky storage tanks. Technology has advanced to better manage spills, using tools and strategies such as floating booms, skimmer ships, controlled burns, and dispersants like Corexit 9527 to break down the oil faster. However, each cleanup method carries pros and cons, affecting the environment and ecosystems in different ways.
I need help with c please
What are agents that can cause infection and disease
pathogens is the answer on engenu!ty
what does the phylogenetic tree tell you about the evolutionary relationships of animals?
A)animals descended from one ancestor
B)Animals are unrelated to one another
C)Animals belong to several different kingdoms
D)Animals have many different ancestors
Final answer:
Phylogenetic trees help visualize the evolutionary relationships among species by showing how they diverge from common ancestors. Rooted trees indicate that all organisms, including animals, share a single ancestral lineage. Therefore, phylogenetic trees provide evidence that animals descended from one ancestor.
Explanation:
Phylogenetic trees are crucial tools used by biologists to understand the evolutionary relationships among different species, including animals. These diagrams, whether rooted or unrooted, provide a visual representation of how species are related to each other and trace back to common ancestors. A rooted phylogenetic tree starts with a single ancestral lineage at its base, from which all other branches diverge.
This common ancestral point signifies that, according to the theory of evolution, all organisms represented in the diagram share a single ancestral lineage. Thus, these trees can show us how closely related different species are, how recent or ancient these relationships might be, and even hint at the chronological sequence of divergences that led to the current diversity of life forms.
Regarding the options provided, the most accurate answer to the question of what phylogenetic trees tell us about the evolutionary relationships of animals would be 'A) animals descended from one ancestor'. This option aligns with the concept of a rooted phylogenetic tree, where all organisms represented in the diagram relate back to a single ancestral lineage, showcasing the interconnectedness of life and how diverse species have evolved over time from this point.
which three components make up almost all of the energy earth receives from the sun?
Sunlight is composed of three components:-
1. Visible light: which enables the objects to be visible. The objects absorb the rays and reflect the ones which give them color.
2. Ultra violet rays: These rays are the most harmful ones. Although they are absorbed by the ozone layer and very less amount is able to reach the Earth's surface. These are cancer causing rays.
3. Infra red rays: These are the rays which are responsible for maintaining the temperature of the Earth's atmosphere. The maximum amount of sun's rays reaching the Earth are IR rays.
Charles Darwin gathered a lot of data about the natural world over a 5 year period as he traveled the coastline of South America and the Galapagos Islands. Which of the following statements explains what he found after analyzing his data?
Darwin's analysis of his data gathered during his voyage led to the theory of evolution by natural selection, proposing that organisms with advantageous traits will survive and reproduce more effectively than those without such traits (option A).
Charles Darwin's pivotal research during his five-year voyage, particularly in South America and the Galápagos Islands, led him to propose a groundbreaking theory in the field of biology. After analyzing his data, he concluded that organisms with helpful traits have a better chance of surviving longer and producing more offspring than those without such traits (option A). This is the core concept of Darwin's theory of evolution by natural selection.
On the Galápagos Islands, Darwin observed that the traits of giant tortoises varied from island to island, corresponding to the specific environmental conditions of each island. For instance, tortoises that had long necks were better suited to reach higher vegetation and thus had a selective advantage in environments with taller plants. Over many generations, these advantageous traits would be passed down, leading to a gradual adaptation of the species to its environment.