Before testing for starch, the leaf is warmed in ethanol. The ethanol turns green. Why is this?
Most efficient method of extracting tears from an elderly woman?
By using Ophthalmic sponges
Explanation:Ophthalmic sponges are also widely used for collecting non-ocular mucosal secretions, that is, cervical fluids and sputum, to measure antibody or cytokine levels. Microscopic fragmentation of ophthalmic surgical sponge spears used for delivery of antiproliferative agents in glaucoma filtering surgery.
The fungi in the picture are an important part of the ecosystem because they
Fungi are important because they help decompose dead organisms and recycle the nutrients, which plants benefit from it.
What was the basic shortcoming of the Greek philosophers approach to studying the material world?
How do the cells of a multicellular organism differ from those of a unicellular organism? Question 3 options: They are all the same. They are specialized. They never replicate.
Meg and Rachel each have bowling balls with the same mass. They both roll them as hard as they can and then measure the speed of the balls. Meg's ball and Rachel's ball were measured to have the exact same speed. What do you know about the forces applied by the girls?
A) Meg applied more force than Rachel.
B) Rachel applied more force than Meg
.
C) They applied an equal amount of force.
D) They applied a almost the same amount of force.
Meg and Rachel applied the same force because the speed was the same amount of the force. Thus, option D is correct.
What is force?
In general language we can say that push or pull is called force.
According to newton second law of motion force is rate change of momentum it means
F= d/dt×(mxv)
Where m is mass and v is velocity
But in general case mass is constant.
So ,Force
F= mxd/dt×(v)
Since we know that rate change of velocity is acceleration.
Then we can say that
F= mass x acceleration
S.I unit of force is Newton
1 Newton = 1kg×m/sec^2.
Force and acceleration is a physical quantity which have both i.e magnitude and direct it means both are vector quantity. According to newton second law of motion force is rate change of momentum it means
F= d/dt×(mxv)
Therefore, Meg and Rachel applied the same force because the speed was the same amount of the force. Thus, option D is correct.
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Animals in the same phylum arthropoda must also be in which same taxon
Asexually, fungi can reproduce by fission, fragmentation, budding, or _____.
A. producing spores
B. mitosis
C. meiosis
Fungi can reproduce asexually through fission, fragmentation, budding, and spore production. Spore production allows for rapid creation of new organisms in suitable conditions. Asexual reproduction in fungi doesn't require a partner and enables quick colonization of new environments.
Explanation:Asexually, fungi can reproduce by multiple mechanisms including fission, fragmentation, budding, and producing spores. Spore production is a common mechanism in many different types of fungi. These organisms create unique reproductive structures, where spores are formed. When conditions are appropriate, the spores are released and can grow into a new organism. It's important to note that asexual reproduction in fungi allows for rapid proliferation and colonization of new environments, as it doesn't require a partner.
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Trees use narrow tubes to transport water upward. Which property of water allows the water to rise in these narrow tubes?
a.net charge of molecules
b.high boiling point
c.cohesion of molecules
d. high vapor pressure
Answer:
C. Cohesion of molecules
Explanation:
Cohesion is the interaction of molecules of the same substance together. By the force of cohesion if two drops of water come together they form one. Water has high rates of cohesion due to hydrogen bonds.
This phenomenon also called surface tension and is what allows small insects to stand on water.
Cohesion along with adhesion of water to the walls of the narrow tube generate what is called capillarity. This allows liquids to ascend inside the narrow tubes. As long as the cohesion is less than the adhesion, the liquid will rise until both forces are equal.
Answer:
C
Explanation:
imagine a model of a cell shaped like a cube.Calculate the ratio of surface area to volume for a cell model measures 3 cm on each side
The surface area of one side = 1 cm X 1 cm = 1 cm2
There are 6 sides, total SA = 6 X 1 cm2 = 6 cm2
Volume = 1 cm X 1 cm X 1 cm = 1 cubic cm (1 cm3)
Surface to Volume Ratio = 6 cm2/1 cm3 = 6 cm2/cm3
The surface area of one side = 6 cm X 6 cm = 36 cm2
There are 6 sides, the total SA = 6 X 36 cm2 = 216 cm2
Volume = 6 cm X 6 cm X 6 cm = 216 cm3
Surface to Volume Ratio = 216 cm2/216 cm3 = 1 cm2/cm3
what happens to the spores when a sporangium splits open.
The sporangium rupture usually involves specialized structures that enhance expulsion of the spores away from the parent gametophyte.
What happens to the spores when sporangia open?
When the sporangia dry out, they break open, releasing the spores into the wind.
What is a sporangium?
A sporangium is a structure in certain plants and other organisms that is charged with making and storing spores.
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what part of the cell is most like the stomach
Select all that apply. _____ trigger other proteins and enzymes to stimulate cell division. External and internal stimuli Regulating protein agents Activators and inhibitors Metabolic pathways
The right answer is Regulating protein agents.
The regulating protein agents they are talking about is certainly the cyclin, especially cyclin B.
Cyclins have no enzymatic activity, they are regulatory proteins necessary for Cdk to be enzymatically active.
The activation of the Cyclin B / Cdk1 stock is the result of a series of complex and interdependent reactions:
When replication is complete, the Cdc25 phosphatase is no longer sequestered in the cytoplasm and passes into the nucleus, and at the end of the G2 phase, the Cdc phosphatase is activated, probably by phosphorylation by the Polo kinase. Cdc 25 then acts to remove the two phosphates inhibitors Cyclin B / Cdk 1 (after that, there is a process of self-activation).
Cyclin B / Cdk 1 complexes, once activated, allow entry into mitosis. For this, they intervene by triggering a number of phenomena that take place at the beginning of mitosis, that is to say in prophase.
Why do enzymes generally only bind to one type of substrate?
Explanation:
Enzymes are proteins that increase the reaction rate that occurs within the cells.
enzymes generally only bind to one type of substrate because the active site of the enzymes has a certain shape and as per lock and key model, the enzymes have to be of specific shape the same as the substrate to get fit.
Enzymes have active sites, where the substrate gets fits when the reaction occurs.It means that enzymes generally only bind to one type of substrate and they are highly specific for their substrate.
why are biologists and ecologists interested in determining the sizes of populations of organisms ms other than humans
The Biologists and Ecologists interested in determining the sizes of population of organisms other than Humans because studying various kinds of plant, animal, fungal, and even bacterial populations leads to find the answer to how the population interacts with its physical environment and with other species.
By studying population size ecologists can see how these populations have changed and may be able to predict how they're likely to change in the future. Monitoring the size and structure of populations can also help ecologists manage populations—for example, by showing whether conservation efforts are helping an endangered species increase in numbers.
Size and density are both important in describing the current status of the population and, potentially, for making predictions about how it could change in the future, for example:
Larger populations may be more stable than smaller populations because they’re likely to have greater genetic variability and thus more potential to adapt to changes in the environment through natural selection. A member of a low-density population—where organisms are sparsely spread out—might have more trouble finding a mate to reproduce with.So, the biologists and ecologists are interested in determining the sizes of population of organisms because it helps in studying the ecological effects, and environmental effects of the population size on the ecosystem.
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1) A scientist must always try to avoid _____________ in scientific experime
Scientists must always endeavor to avoid biases in their experiments. Biases can impede the objectivity of the scientist and the validity of the experiment's results.
Explanation:A scientist must always try to avoid biases in scientific experiments. A bias is a prejudice in favor of or against one thing, person, or group compared with another, usually in a way that's considered to be unfair. Biases can affect the objectivity of the scientist and the credibility of the experiment. For example, if a scientist is testing a new drug and they unconsciously favor positive results because they want the drug to succeed, that can introduce bias into the process, skewing the results. This is why it's crucial for scientists to recognize and mitigate biases when conducting research.
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Photographs of the surface of Mars reveal the presence of sand dunes that shift over time. These dunes demonstrate the presence of what phenomenon on Mars?
f Magnetic pole reversals
g Winds
h Plate tectonics
j Precipitation
The presence of shifting dunes on Mars is evidence of wind activity on the planet. Martian winds are capable of redistributing surface material and forming dunes, and the photographs of these dunes indicate active wind-driven processes. So the correcct option is g.
Explanation:The shifting dunes on Mars demonstrate the presence of winds on the planet. These winds play a crucial role in redistributing surface material. As described, much of the material stripped from Martian canyons has been deposited into extensive dune fields, primarily at high latitudes.
Mars experiences various wind-related phenomena, such as dust devils, which are responsible for creating patterns on the surface by moving dust and sand. These dust devils and windstorms have enough power to move sand and create dunes, which change shape and position over time. The passage of Martian winds over loose sediments can also result in cross-bedded sandstone formations, as have been interpreted from images taken by the Curiosity rover in Gale Crater, indicating past interactions with liquid water.
In summary, Mars' winds are integral to the planet's surface dynamics, creating and shifting the dunes observed in high-resolution photographs. These winds are an essential factor in understanding the Martian climate, surface erosion, and geological history.
Explain how observation, interpretation, and explanation are important to the study of science
The brown paper test for lipids is positive when food is placed on the paper and a spot forms which will allow light to pass through it. Which food would give the strongest positive test for lipids? A) oatmeal B) margarine C) corn syrup D) chicken broth
maragarine
is the answer
if the sun contributes 11382400 kj of energy and the producers were only able to assimilate 1% of that energy how many joules would they be able to use?
Which of the following is NOT a characteristic of an invasive species? Invasive species
Question 7 options:
have specific needs or requirements to survive.
grow rapidly and compete with other plants or animals.
produce large numbers of seeds/offspring at a young age.
have a native region with a climate similar to the affected invaded area.
Save
Final answer:
An invasive species is a species that arrives in a habitat it had not previously occupied and establishes a population that spreads autonomously. It has specific needs or requirements to survive, grows rapidly and competes with other plants or animals, and produces large numbers of seeds/offspring at a young age. However, the characteristic that is NOT associated with invasive species is having a native region with a climate similar to the invaded area.
Explanation:
An invasive species is a species that arrives in a habitat it had not previously occupied and establishes a population that spreads autonomously. It has specific needs or requirements to survive, grows rapidly and competes with other plants or animals, and produces large numbers of seeds/offspring at a young age. However, the characteristic that is NOT associated with invasive species is having a native region with a climate similar to the invaded area.
Final answer:
Invasive species are adaptable and not characterized by having specific survival needs. They threaten biodiversity due to rapid growth and competitive advantages, but don't necessarily originate from areas with similar climates to the regions they invade.
Explanation:
The characteristic of an invasive species that is NOT true is that they have specific needs or requirements to survive. Invasive species are typically successful exactly because of their ability to thrive in a variety of conditions and do not have highly specific environmental requirements. These species are adaptable, grow rapidly, and often compete with native plants or animals, often causing conservation problems as they threaten biodiversity in invaded ecosystems. Their successful spread usually depends on their reproductive strategies, such as producing large numbers of seeds or offspring at a young age. Moreover, invasive species do not necessarily come from a native region with a climate similar to the affected invaded area; they often have broad environmental tolerances.
What distinguishes one element from another
The main factor that distinguishes one element from another is its atomic number.
Each element on the periodic table has a unique atomic number, which corresponds to the number of protons found in the nucleus of an atom of that element.
For example, hydrogen has an atomic number of 1 because it has one proton, while carbon has an atomic number of 6 because it has six protons.
Other properties that help distinguish elements from one another include their atomic mass (the total mass of protons, neutrons, and electrons in an atom), electron configuration (the arrangement of electrons in atomic orbitals), and physical properties such as melting point, boiling point, density, and color.
Thus, it is the atomic number that serves as the primary characteristic distinguishing one element from another.
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QUICK PLEASE HELP PLEASE
Use the Density Equation to solve the problems.
Equation: Density = mass/volume or D = m/v
A 10.0 cm3 sample of copper has a mass of 89.6 g. What is the density of copper?
Question 1 options:
A 6.5 g / cm3
B 9.5 g / cm3
C 8.96 g / cm3
D 11.2 g / cm3
Use the Density Equation to solve the problems.
Equation: Density = mass/volume or D = m/v
A block of wood has a density of 0.6 g/cm3 and a volume of 1.2 cm3. What is the mass of the block of wood?
Question 2 options:
A 8.2 g
B 1.5 g
C 2.2 g
D 0.72 g
Use the Density Equation to solve the problems.
Equation: Density = mass/volume or D = m/v
A 600g boulder has a density of 8 g/cm3. What is the volume of the boulder?
Question 3 options:
A 75 cm3
B 0.013 cm3
C 66 cm3
D 57 cm3
describe the relationship between diffusion, cell.size, surface area, and cell volume
It is advantageous for animals that migrate to store energy in the form of lipids rather than carbohydrates. This is because A) lipids do not form polymers. B) lipids are more dense than carbohydrates. C) carbohydrates do not supply energy to cells. D) lipids weigh less and store more energy (gram for gram) than carbohydrates.
Answer:
D
Explanation:
just cause it is
Which statement correctly describes the diagram?
A) The products of photosynthesis cannot be used by other organisms.
B) The products of respiration can be used by plants for photosynthesis.
C) The exchange of oxygen and carbon dioxide occurs only in respiration.
D) The exchange of oxygen and carbon dioxide occurs only in photosynthesis.
the correct answer is b) the product of respiration can be used by plants for photosynthesis.
Ricky notices a similarity between a fried egg and the diagram of a cell. Which cell organelles is Ricky likely to associate with the parts of the egg?
A fried egg have the yolk part in the center facing up, and the albumen surrounds this yellow yolk. A person can see the similarity between the fried egg and the diagram of a cell. The yellow yolk of the fried egg can be easily matched to the nucleus of the cell, and the albumen part as the cytoplasm. The nucleus is a cell organelle which is present in the cell of the eukaryotes. The cytoplasm is the fluid present inside the all the cells.
Coral reefs are home to numerous species because
seedless bananas were probably first caused by a blank
The first samples of the moon’s surface to be brought back by Apollo astronauts were
carefully examined for signs of life. What sort of evidence do you think scientists looked for and how did they go about obtaining that information? Were there any signs of life?
There are numerous methods for gathering information or proof. Scientists can collect their data through making observations of the natural world, conducting laboratory experiments, or using computer models.
What is astronaut?A person who has undergone specific training to travel to space is known as an astronaut.
The duties of an astronaut aboard a spaceship can vary. Usually, a pilot and a commander work together to lead the mission.
The term "astronaut," which is derived from the Greek words for "star" and "sailor," is frequently used to refer to someone who has travelled through space.
More specifically, in the West, the term "astronaut" refers to space travellers from the United States, Canada, Europe, and Japan.
Six Apollo flights between 1969 and 1972 returned 382 kilogrammes (842 pounds) of lunar rocks, core samples, pebbles, sand, and dust. 2200 unique samples from six different Moon exploration locations were returned by the six space missions.
Thus, these are they obtain that information.
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Final answer:
Scientists looked for organic compounds, microfossils, and potential microorganisms in the lunar samples, using thorough laboratory analyses. No signs of life were found on the Moon. The samples still provide valuable information for scientific research about lunar history.
Explanation:
When the Apollo astronauts brought back samples of the Moon's surface, scientists searched for evidence of life by examining these samples for organic compounds, microfossils, and any possible living microorganisms. They used various types of analyses, such as microscopy, chemical analysis, and culturing techniques. Despite the detailed examination of nearly 400 kilograms of lunar material, no signs of life were found on the Moon. The studies did provide invaluable insight into the Moon's composition and history, including its formation about 4.5 billion years ago. Since then, the samples returned from the Apollo missions have continued to be of scientific value, enhancing our understanding of lunar geology and the early Solar System.
The comprehensive study of lunar soil and regolith also confirmed that it had been pulverized by impacts, as suggested by the Surveyor missions, and was firm enough to support the Apollo Lunar Surface Experiment Package (ALSEP) which operated for years after deployment. Such detailed analysis has been crucial to expanding our knowledge of the Moon and has left a lasting legacy, with the lunar material collected still providing data for current scientific research.