Final answer:
A cell at the end of G₁ phase has grown and accumulated building blocks of DNA, while a cell at the end of G₂ phase has replenished energy stores, synthesized proteins, and completed preparations for mitosis.
Explanation:
At the end of the first phase of the cell cycle, known as G₁ phase, a cell has grown and carries out normal metabolic functions. It is accumulating the building blocks of DNA and energy reserves to replicate each chromosome in the nucleus. At the end of the second phase, known as G₂ phase, the cell has replenished its energy stores, synthesized proteins for chromosome manipulation, and duplicated some organelles. It has completed the necessary preparations for the mitotic phase, which involves nuclear division in mitosis and division of the cytoplasm in cytokinesis.
Final answer:
A cell in the G2 phase is preparing for mitosis by replenishing energy and synthesizing necessary proteins, while a cell at the end of the mitotic phase has completed cell division, resulting in two identical daughter cells.
Explanation:
A cell at the end of the first phase of the cell cycle, known as the G2 phase, differs from a cell at the end of the second phase or the mitotic phase in several ways. During the G2 phase, the cell is preparing for mitosis by replenishing its energy stores, synthesizing proteins for chromosome manipulation, duplicating some organelles, and dismantling the cytoskeleton to provide resources for the mitotic spindle. Additionally, there might be additional cell growth during G2.
At the end of the mitotic phase, which consists of mitosis and cytokinesis, the cell has successfully divided to form two identical daughter cells. During mitosis, the duplicated chromosomes are aligned, separated, and moved to opposite poles of the cell. Cytokinesis then divides the cytoplasm, completing the formation of two separate daughter cells.
These stages are tightly regulated by internal and external signals. Failure in these signals can cause uncontrolled cell division and potentially lead to cancer.
Which of the arrows at right describes the path that energy moves in an ecosystem?
X-rays _____.
were discovered by accident
have no uses today
reduced infection after surgery
were invented by the British Army
Final answer:
X-rays were discovered by accident when Wilhelm Röntgen found that they could pass through soft tissue but not denser bone, leading to breakthroughs in medical imaging. During World War I, Marie Curie advocated the use of mobile X-ray units for diagnosing soldiers. Radiology, the use of X-rays in medicine, remains a widely used diagnostic tool.
Explanation:
X-rays were discovered by accident by the German physicist Wilhelm Röntgen in 1895. The discovery occurred while Röntgen was experimenting with electrical currents and noticed that a certain invisible ray could pass through human tissue but would leave the shadow of bones on a screen coated with a metal compound. The ability of X-rays to pass through soft body tissue and be absorbed by denser materials like bone enabled, for the first time, doctors to see inside a living patient without surgery.
During World War I, X-ray technology became particularly useful in the medical field. Mobile X-ray units, which were advocated by Madame Marie Curie, greatly aided military doctors. These units were deployed to diagnose injured soldiers, improving medical care and enabling more effective treatments, such as the optimized removal of embedded bullets.
Furthermore, the use of X-rays in medicine, which is known as radiology, has become a central tool in diagnostics. Due to its relative cost-effectiveness compared to more sophisticated technologies, X-ray usage is widespread and extensive in medical diagnostics to this day.
What is the cellular boundary found in animal cells?
in a forest ecosystem, a robin and a squirrel live in the same tree. the two organisms ___
T h e y. S h a r e. T h e. S a m e. H a b i t a t
Which of the following is true about science?
It reflects personal opinions.
It is durable because it is tested.
It does not change.
It can be disproven by philosophy.
Science is an objective, evidence-based discipline that encourages testing, making it durable. It is an ever-evolving field that changes based on new data and discoveries. Scientific theories or facts cannot be disproven by philosophy alone as they require empirical evidence.
Explanation:Science is an empirical discipline, meaning it is based on making observations and conducting experiments to collect data. It does not reflect personal opinions, but rather strives for objectivity. In fact, the scientific method encourages testing and retesting of theories or hypotheses. This makes science durable because it relies on a body of evidence that withstands rigorous scrutiny. It is also dynamic, constantly evolving and perfecting itself in the light of new data, meaning that science does change over time. While science and philosophy can inform one another, a scientific fact or theory cannot be disproven by philosophy alone because scientific claims require empirical evidence for validation.
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Quick, please!!!!
Which physical evidence supports the theory that all continents were once together and have separated over time?
Common marine animal fossils found in various continents
Matching coastlines of Africa and South America
That most earthquakes occur along a plate boundary
Oceanic ridge near a divergent plate boundary
Explain the ecological impact of a decline in phytoplankton by providing examples from the organization through the ecosystem levels of organism
A decline in phytoplankton populations affects the entire marine food web, leading to food shortages for all organisms up the food chain and impacting global oxygen production. Human activities like overfishing and climate change exacerbate these effects, potentially causing the collapse of fisheries and disrupting marine ecosystems.
The ecological impact of a decline in phytoplankton can be profound, as they are a critical part of the marine food web. Phytoplankton are considered the primary producers in ocean ecosystems, creating organic compounds from sunlight and nutrients which support the entire food chain. The complex food web relies on phytoplankton to feed zooplankton, which in turn, are consumed by small predators such as shrimp and krill. These small predators are essential food sources for larger marine animals including fish, birds, and mammals. If phytoplankton populations decrease, this leads to a food shortage that cascades through the food chain, causing declines in populations at all levels, from zooplankton to apex predators. Moreover, the loss of phytoplankton can affect global oxygen levels, as they contribute significantly to the Earth's oxygen through photosynthesis.
The depletion of whale populations due to whaling, coupled with overfishing of smaller fish species, exacerbates this problem, as whales play a role in nutrient cycling which supports plankton growth. Human activities, such as overfishing and contributing to climate change, have a ripple effect that impacts energy cycling in marine ecosystems, potentially leading to the collapse of fisheries and disruptions to the balance of marine life.
The universe currently opperates under _______ laws which are predictable.
1. Physical
2. People's
3. Artificial
The universe operates under physical laws which are universal. These laws govern every interaction and particle in the universe. People's laws and artificial laws are human constructs and don't influence the physics of the universe.
Explanation:The universe currently operates under physical laws which are predictable. These physical laws, such as those of gravitation, thermodynamics, and quantum mechanics, govern the behavior of every interaction and particle in the universe. These laws are tested and confirmed through systematic observation and experimentation.
People's laws or artificial laws are human concepts and don't directly influence the physical reality of the universe. Physical laws are universal and still apply, regardless of human interaction or perception. That's why option 1 - Physical laws is the most accurate.
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The laws of motion discovered in the 17th century were used to explain force, movement, and acceleration for decades. However, by 1905, there were a number of findings that could not be explained by those laws. Which statement BEST describes the eventual outcome? A) The old laws of motion were discarded in favor of new ones. B) Scientists realized the limitations of the scientific method. C) Scientists formulated a new theory that elaborated on the original. D) All the calculations using the old theory were found to be incorrect.
Answer:
Option C
Explanation:
Law of motion is a scientific law and like all other scientific laws it does not guarantee accurate explanations to natural phenomenon. Therefore, from time to time with new discoveries, these laws need to be refined in order to comply with new findings and discoveries.
Therefore, when laws of motion could not explain the new findings it became essential to formulate a new theory based on the existing one.
Thus, option C is correct
Now it is your turn. Be sure to design an experiment that you can conduct with materials you have on hand or that you can acquire easily. You will need to complete the experiment, recording observations and data. You will submit your assignment in a lab report.
Sample topics to experiment with include:
1.What affect will adding soap to water have on surface tension?
2.How do different materials affect capillary action?
3.How does adding salt affect the freezing point of water?
4.How does temperature change affect water's cohesion?
5.How does temperature change affect surface tension?
The experiment, which involves exploring how the addition of salt affects the freezing point of water, involves the principles of Physics and firsthand observation. You will need to document each step, observation, and conclusion in your lab report.
Explanation:The experiments mentioned in your question primarily deal with principles of Physics, particularly those connected to fluid dynamics and thermodynamics. I will take the third experiment, how adding salt affects freezing point of water, as an example.
For the experiment, you will need water, salt, a freezer, a thermometer and a cup. Start by filling the cup with water and noting the freezing temperature without any salt. Repeat the experiment but this time, dissolve a spoonful of salt in the water and measure the freezing temperature again. In general, salt lowers the freezing point of water, a principle called 'Freezing Point Depression'.
Your lab report should document every step of the experiment, your observations, the measurements recorded, and your conclusions based on these observations. Don't forget to discuss any discrepancies or surprises, including potential errors or shortcomings in the experimental setup.
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is Hemoglobin built by carbohydrates, lipids, proteins or nucleic acids?
11) A bowling ball and a soccer ball are about the same size and volume. Which is more dense the soccer ball or the bowling ball and why?
Answer:
Bowling ball.
Explanation:
Density of any object may be defined as the mass of an objects per unit the volume covered by the object. The formula to calculate density is mass/ volume.
A bowling ball and a soccer ball both has same volume and size. The density of bowling ball is is higher than soccer ball because the bowling ball has the larger mass than soccer ball. Density of an object is directly proportional to its mass. Hence, the bowling ball has higher density.
Thus, the answer is bowling ball.
The major food storage part of carrots is the:
root
stem
branch
leaf
Please help me!!!!!!!!
Answer:
root is the correct answer.
Explanation:
The major food storage part of carrots is the root.
In carrot, food is stored in the roots and the roots of the carrots are filled with nutrients, sugars, and starches.
the food which is stored in the roots of the carrot helps in the growth of the new plants.
What kind of model would you use to represent the human heart