Sieve plates:
A. do not contain plasmodesmata.
B. are modified cell walls that connect sieve elements.
C. dissolve at sieve tube maturity.
D. have solid, impermeable surfaces.
E. contain mitochondria and chloroplasts.
Answers
The correct answer is B - Sieve plates are modified cell walls that connect sieve elements. Sieve plates are formed from the merging of two adjacent sieve elements and are made up of primary and secondary cell walls.
These plates have pores or sieve areas that allow materials to pass through and are not solid, impermeable surfaces. Sieve plates do not contain plasmodesmata, dissolve at sieve tube maturity, or contain mitochondria and chloroplasts. Plasmodesmata are channels that link adjacent plant cells, allowing for communication and transfer of substances between them. They are like "channels" in plant cells that allow the transport of organic molecules between cells. The cell wall is penetrated by plasmodesmata, which connect the cytoplasm of one cell to that of the next.
This helps to transport water, minerals, and nutrients between cells without the need for transport via the xylem or phloem. Plasmodesmata are permeable to ions and proteins, and their size is regulated to allow certain substances to pass through the cell membrane in limited quantities.
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Related Questions
Which of the following phrases about heat transfer properties best matches the use of plastic handle for a frying pan? O Poor reflector of heat radiation Good absorber of heat radiation O Poor conductor of heat O Good conductor of heat
Answers
what is the name of the part of dna where dna replication starts ?
Answers
Answer:
the nucleus
Explanation:
I think this is correct
I need to know the independent variable
Answers
Answer:
the chirping?
Explanation:
TRUE or FALSE? The development of homes
and building can threaten Wetland
ecosystems since water is required to
cleared.
A) False
B) True
Answers
Answer:
True
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What four animals below share a common ancestor?
Whale
Frog
Horse
Lion
Bat
Bird
Answers
Answer:
Whale, Horse, Bat, and Bird
Explanation:
Whale, horse, bat, and bird are all part of the same clade of mammals called Boreotheria, which diverged from other mammals in the Cretaceous period Frog and lion belong to different clades of vertebrates that are more distantly related to Boreotheria.
Alcoholic fermentation (2 points)
Answers
Answer:
It is a biological process that converts sugars such as glucose, fructose, and sucrose into cellular energy, producing ethanol and carbon dioxide as synthetic products.
Answer:
Uses oxygen and ATP molecules as reactants
Explanation:
Took the test
explain "environmentally friendly" as an advantage of
water
transport
Answers
The environmentally friendly nature of water transport lies in its capacity to minimize carbon emissions, utilize existing waterways, reduce traffic congestion, and explore cleaner energy alternatives.
Water transport, such as ships, boats, and barges, is often regarded as environmentally friendly due to several advantages it offers in terms of reducing negative impacts on the environment.
Firstly, water transport has a relatively low carbon footprint compared to other modes of transportation like road or air transport.
Ships and barges are more fuel-efficient and can carry large amounts of cargo in a single trip, reducing the overall energy consumption and emissions per ton of goods transported.
This efficiency helps to mitigate greenhouse gas emissions and air pollution.
Secondly, water transport relies on natural waterways like rivers, lakes, and oceans, minimizing the need for constructing new infrastructure. Unlike land-based transport, which requires the construction and maintenance of extensive road networks, water transport utilizes existing water channels, reducing land disruption and habitat destruction.
Additionally, water transport has the potential to contribute to the reduction of traffic congestion on roads, as it can transport goods over long distances without adding to the traffic volume.
This can lead to a decrease in traffic-related pollution and enhance the overall air quality in urban areas.
Moreover, water transport can offer an alternative to fossil fuel-dependent modes of transportation.
By utilizing innovative technologies, such as electric or hybrid propulsion systems, water transport can further reduce its environmental impact by transitioning to renewable energy sources.
These advantages make water transport an attractive option for sustainable logistics and contribute to mitigating the adverse effects of transportation on the environment.
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Which is an example of antiracist behavior?
A. Rachel pretends she didn't hear a negative comment about
Latinos.
B. Rachel mentions that some of her best friends are Latino.
C. Rachel says it's wrong to say negative things about Latinos based
on a stereotype.
O D. All of the above
Answers
Focused on his observations, he suddenly hears something behind him. After a brief movement, he realizes that the source of the noise is a gigantesque bear. Fortunately, the bear does not feel the presence of Jack. Nonetheless, Jack is scared and stressed by this encounter.
Q1: Explain and illustrate what happens in his body at that time and how it is beneficial
Answers
Jack's body goes into fight-or-flight mode, releasing adrenaline and other hormones that prepare him to either run away or fight the bear.
When Jack sees the bear, his brain releases a hormone called adrenaline. Adrenaline causes his heart rate and breathing to increase, his pupils to dilate, and his muscles to tense up. This is known as the fight-or-flight response. The fight-or-flight response is a natural reaction to danger that helps us to survive. It prepares us to either run away from the danger or fight it. In Jack's case, he is scared of the bear, so his body is preparing him to run away. However, if the bear were to attack him, his body would switch to the fight-or-flight response and he would be prepared to fight back.
The fight-or-flight response is beneficial because it helps us to survive in dangerous situations. However, it can also be harmful if it is triggered by something that is not actually dangerous. For example, if Jack is constantly stressed about work or school, his body may be constantly in the fight-or-flight mode, which can lead to health problems such as high blood pressure, heart disease, and anxiety.
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Which are the following are examples of conditions that contribute to populations ceasing to grow (and therefore reaching their carrying capacity)?
- low alcohol level levels in the growth media for yeast
- elephant seals living on moderately-inhabitated breeding beaches
- barnacles having little space to attach
- the sugar supply becoming depleted for yeast
- low parasite levels in fish populations
Answers
Population growth refers to the increase in the number of individuals in a population over time. This growth rate is usually expressed as a percentage of the population size over a set period, such as a year. When the number of individuals in a population exceeds the carrying capacity of the ecosystem, population growth ceases to occur. Populations that stop growing (and therefore reach their carrying capacity) face various conditions that contribute to it. The examples of conditions that contribute to populations ceasing to grow and reaching their carrying capacity are:
1. Low alcohol levels in the growth media for yeast: This can limit the growth of yeast as they require a certain level of alcohol to thrive.
2. Elephant seals living on moderately-inhabited breeding beaches: Limited space and resources on these beaches can lead to competition and prevent the population from growing indefinitely.
3. Barnacles having little space to attach: Limited space for attachment can cause a restriction in barnacle population growth, as they require surfaces to attach and grow.
4. The sugar supply becoming depleted for yeast: Yeast relies on sugar as a food source for growth. If the sugar supply becomes depleted, it can halt the growth of the yeast population.
5. Low parasite levels in fish populations: Although this may not directly contribute to reaching carrying capacity, it is still an important factor that can affect population growth in fish populations, as parasites can limit the population growth by causing diseases or impacting reproduction rates.
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Mitosis is a process by which
Answers
Answer:
Mitosis is the process by which a cell segregates its duplicated DNA, ultimately dividing its nucleus into two.
Explanation:
Who is cub 712 parents in Lulu the lioness?
Answers
How is the author effective in offering different characters' points of view without shifting narrators?
A.
Nsue remembering Old Gao’s stories.
B.
Nsue racing to get the honey before he is stung.
C.
The exchange of dialogue between Nsue and his father.
D.
The internal doubt Nsue has, because Nandi’s offering is ready.
How do I know that diagram of amoeba cell division is Asexual reproduction in an amoeba
Answers
Answer:
Amoeba reproduces asexually through binary fission. In this process, an individual divides itself into two daughter cells. These are genetically identical to each other.
Can some one help me plzzzzzz
Answers
Answer:
you are correct it is it relieves energy from mitochondria
Tissue function and structure are linked (i.e. the cell shape or structure is optimal for that location and its associated physiology. If you were to build an organism what type of cells would you use for the outer protective layer? A. Simple squamous B. Simple cuboidal C. Stratified squamous Stratified columnar
Answers
Answer:
Explanation:
If I were to build an organism and needed to choose a type of cell for the outer protective layer, I would choose stratified squamous epithelial cells.
Stratified squamous epithelial cells are found in areas that are subject to physical stress, such as the skin and the lining of the mouth, throat, and vagina.
These cells are flattened and tightly packed, forming a protective barrier that can withstand abrasion and friction. The stratified nature of the tissue allows for regeneration of the outer layers of cells as they are worn away, ensuring continuous protection.
The multiple layers of cells also provide a barrier against invasion by pathogens and other harmful agents. Additionally, the squamous shape of the cells allows for efficient exchange of gases and other small molecules across the tissue.
Therefore, stratified squamous epithelial cells would be an ideal choice for the outer protective layer of an organism.
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What types of bacteria can the carbohydrate utilization test and MacConkey agar be used to differentiate? What would a positive result look like for each test? What would a negative result look like for each test?
Answers
The carbohydrate utilization test and MacConkey agar can be used to differentiate between lactose fermenters and non-fermenters.
A positive result on the carbohydrate utilization test would show a color change from yellow to red, indicating fermentation of the carbohydrate.
A positive result on MacConkey agar would show growth of pink/red colonies, indicating lactose fermentation.
A negative result on both tests would show no color change or growth, indicating the organism is unable to ferment lactose or utilize the carbohydrate. This differentiation is useful in identifying enteric bacteria such as Escherichia coli and Salmonella.
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Please answer this question, I don't really know how to answer:
Describe how grizzly and polar bear evolution may be affected by climate change.
Answers
Explanation:
polar bear depend on ice so if it gets really hot out of a sudden the melt will melt away and it would be harder for them to live. and for grizzly bears if gets cold all out of the sudden the rivers where they get food turns to ice they'll food which is what they depend on (fish) will die and without food they'll die too.
Grizzly and polar bear evolution may be affected by climate change due to habitat loss, adaptation, competition, and interbreeding, all of which will lead to the evolution of polar bears.
What is evolution?As the climate changes, the habitats that these bears depend on may shift or disappear, such as as the Arctic sea ice melts and polar bears are forced to spend more time on land, where they have less access to food; as grizzly and polar bears are closely related and can interbreed, producing hybrid offspring that could potentially alter the genetic makeup of both species; etc. Both grizzly and polar bears may be able to adapt to changing environmental conditions, and grizzly bears may outcompete polar bears for resources, which could further threaten polar bear populations.
Hence, grizzly and polar bear evolution may be affected by climate change due to habitat loss, adaptation, competition, etc.
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the fire alarm in your building is sounding off and you are hurriedly collecting your belongings before evacuating. which portion of the nervous system is dominant?
Answers
When the fire alarm in your building is sounding off and you are hurriedly collecting your belongings before evacuating, the portion of the nervous system that is dominant is the "sympathetic nervous system."
When there is a pressing need for action, such as during an emergency evacuation, the sympathetic nervous system predominates. The "fight or flight" response, which increases heart rate, blood pressure, and breathing among other physiological changes as the body gets ready to react to stimuli, is controlled by this system.
The sympathetic nervous system is triggered during an emergency to aid the person in reacting to the situation swiftly and efficiently. This includes the production of alertness-boosting stress hormones like adrenaline as well as the rerouting of blood flow to the primary muscle groups to support swift movement.
As a result, when someone rushes to gather their belongings before leaving a building because of a fire alarm, their sympathetic nervous system is activated.
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In 1998, scientists discovered that the expansion of the universe has been accelerating.
What force is causing this phenomena?
dark energy
Hubble's law
the Doppler effect
background radiation
Answers
Answer:
Option A (dark energy) is the right answer.
Explanation:
A hypothetical supplier of power that creates a force that contradicts gravity, which is assumed to have been the catalyst of accelerated universe development. Hypothetically, dark energy counteracts the kinetic energy including its beginning of the globe, meaning that perhaps the multiverse does not have intrinsic curvature, although observational measurements presently indicate.Some other three choices have no relation to the particular situation. Thus option A would be the right solution.
Answer:
A
Explanation:
blood bank what examples of peripheral vs integral proteins on rbcs and what are the main functions for these proteins?
Answers
Peripheral protein is at the membrane surface but do not penetrate into the core of the lipid bilayer. Integral protein is present on the RBCs membrane.
Membrane proteins are divided into two categories: peripheral and integral. Peripheral membrane proteins interact with integral proteins or lipids at the membrane surface but do not penetrate into the core of the lipid bilayer. Glycophorins, Rh proteins, Kell and Duffy antigens, band 3 (AE1, anion exchanger 1, SLC4A1), Na+, K+-ATPase, Ca2+-ATPase, and Mg2+-ATPase are examples of integral membrane proteins. Integral membrane proteins contain a large number of membrane receptors and antigens. Enzymes like glyceraldehyde-3-phosphate dehydrogenase and the structural proteins of the spectrin-actin-based membrane skeleton are examples of peripheral membrane proteins that are located on the cytoplasmic membrane face.
An ingested protein helps in Ion transport and the preservation of protein-protein interactions are Band 3's two main roles as the largest integral protein of the RBC. Proteins in peripheral membranes The primary element of the membrane skeleton is spectrin. It is made up of two physically related but functionally different subunits called and spectrin. The remarkable trait of spectrin's high flexibility and ability to take on a range of conformations may be essential for the regular pliancy of membranes.
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Stars and planets produce heat and light while moons reflect light from stars.
False
True
Answers
Not every star has its own light. The Sun and other stars are what generate energy and radiate light. Planets, satellites, asteroids, and comets are some of the other bodies within the solar system .
Correct answer is, False.
Do stars produce or reflect light?The researchers demonstrated in their work, which was published by Nature Astronomy, that stars can and do reflect sunlight, and that the reflected lamp could be a helpful tool to astronomers. Stellar refraction is most important in near binary systems, which consist of two stars orbiting one another.
Are planets emitting or reflecting light?Planets cannot generate their own light because they lack nuclear fusion. Instead, they emit light that is a star's reflection. Venus, a so "Evening Star," and other planets can be seen in the night sky. These are reflections of the sun.
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Which term describes the area where apopulation lives?A. Age StructureB. Migration LocationC. Growth rateD. Geographic Distribution
Answers
Commonly the place where a population lives is described was a habitat, forming a biological community, however there is not an option with that term, but between the present terms the one that is closer to a term for the area where a population lives is D. Geographic Distribution, since all the other alternatives are related to different factors of ecological studies.
How many different elements does molecules of calcium carbonates have
Answers
Why are medications that get rid of fungal infection often harmful to the people who take them but medications for a bacterial infection is not?
Answers
Medications for fungal infections can be harmful to people because they target ergosterol which is a component of fungal cell membranes, and can also inhibit enzymes that are important for human cells.
Fungal and bacterial cells have significant differences in their structures, which makes them vulnerable to different types of medications. Fungal cells have cell membranes that contain ergosterol, a component that bacterial cells do not have. Medications for fungal infections, such as fluconazole, target ergosterol, which can cause harm to human cells that contain similar components, such as cholesterol. Additionally, some antifungal medications can inhibit enzymes that are important for human cells, leading to harmful side effects. On the other hand, medications for bacterial infections, such as penicillin, target bacterial cell walls or other components that are not present in human cells, making them safer for human use.
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Which of the following BEST describes the relationship between concentration and enzyme activity?
A. As enzyme concentration decreases, enzyme activity increases.
B. When substrate concentration decreases, enzyme activity decreases.
C. As substrate concentration increases, substrate activity increases.
D. When substrate concentration increases, enzyme activity decreases.
Answers
The statement that BEST describes the relationship between concentration and enzyme activity is when substrate concentration decreases, enzyme activity decreases (Option B).
Enzymes are proteins that speed up chemical reactions by lowering the activation energy of that reaction.Some factors that alter enzymatic activity include temperature, pH, and substrate concentration. An enzyme works in optimum condition as long as there is more substrate available which can be broken down by the specific enzyme.However, the enzymatic activity increases as the substrate concentration until a limiting value is reached.In conclusion, the statement that BEST describes the relationship between concentration and enzyme activity is when substrate concentration decreases, enzyme activity decreases (Option B is correct).
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The most cost-effective approach to reducing injury and deaths from motorcycles is to: Group of answer choices Increase traffic enforcement Mandate that motorcycles should themselves be safer Require better emergency services at hospitals Take a community-based approach to requiring and enforcing the use of helmets when riding a motorcycle
Answers
The most cost-effective approach to reducing motorcycle injuries and deaths is a community-based approach that requires and enforces the use of helmets. This strategy promotes helmet use, creates awareness, and establishes collaboration between stakeholders to make helmet-wearing a social norm, effectively preventing head injuries and fatalities.
The most cost-effective approach to reducing injury and deaths from motorcycles is to take a community-based approach to requiring and enforcing the use of helmets when riding a motorcycle. Helmet use has been proven to be highly effective in preventing head injuries and fatalities in motorcycle accidents. Implementing helmet laws and ensuring their enforcement can significantly reduce the risk of severe injuries and deaths.
A community-based approach involves creating awareness about the importance of helmet use, providing education on proper helmet fitting and usage, and enforcing helmet laws through collaborative efforts between law enforcement agencies, community organizations, and local government. This approach aims to create a culture of helmet use within the community and make it a social norm.
Compared to other options like increasing traffic enforcement, mandating safer motorcycles, or improving emergency services, promoting helmet use is a more cost-effective strategy. Helmets are relatively affordable and accessible compared to other safety measures, and the enforcement efforts can be focused on specific areas with higher motorcycle usage or accident rates. By prioritizing helmet use, communities can effectively reduce the risk of head injuries and save lives without extensive infrastructure or resource requirements.
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The kind of gene whose product interacts with other nucleotide sequences to affect their transcription or translation is a _____ gene.
Answers
Answer:
constitutive gene.
Explanation:
i went to 6th grade
(Types of Cells)you and your friend are looking at two slides under the microscope. In slide A you notice that the cells are very tiny, simple, and reproducing extreaemely quickly compared to the larger cells and more slowly reproducing cells of slide B. what can you conclude about slide A and B from this information.
Slide A is likely a prokayotic cell and Slide B is likely a eukaryotic cell
Slide A is likely a plant cell and Slide B is likely an animal cell
Slide A is likely a eukaryotic cell and Slide B is likely a prokaryotic cell
Slide A is likely a plant cell and Slide B is likely nonliving and probably a rock
Answers
What type of cell is shown in the diagram above? Explain your answer.
Answers
Answer:
Plant Cell
Explanation:
It is shaped like a rectangle and has a huge vacuole which is the biggest thing in a plant cell. Your welcome :)
When Mendel crossed yellow peas with green peas, the next generation was all yellow. How is this explained