A problem that frustrates attempts to organize the entire living world for study: we don't know how many separate __________ of life forms exist on this planet.
In plants, the cell wall forms as a young plant secretes polysaccharides onto the outer surface of its plasma membrane. Being thin and pliable, this primary wall allows the cell to enlarge and change shape. In mature woody plants, cells in some tissues deposit material onto the primary wall's inner surface. Why doesn't this secondary wall form on the outer surface of the primary wall?
The secondary cell wall is a structure found in many plant cells, located between the primary cell wall and the plasma membrane. The cell starts producing the secondary cell wall after the primary cell wall is complete and the cell has stopped expanding.
Secondary cell walls provide additional protection to cells and rigidity and strength to the larger plant. These walls are constructed of layered sheaths of cellulose microfibrils, wherein the fibers are in parallel within each layer. The inclusion of lignin makes the secondary cell wall less flexible and less permeable to water than the primary cell wall. In addition to making the walls more resistant to degradation, the hydrophobic nature of lignin within these tissues is essential for containing water within the vascular tissues that carry it throughout the plant.
The secondary cell wall consists primarily of cellulose, along with other polysaccharides, lignin, and glycoprotein. It sometimes consists of three distinct layers - S1, S2 and S3 - where the direction of the cellulose microfibrils differs between the layers.
Answer:
The secondary wall form on the outer surface of the primary wall due to presence of middle lamella.
Explanation:
Middle lamella is present between the primary walls of the adjacent plant cells. Middle lamella is a sticky layer that serves to cement the adjacent plant cells together.
Due to the presence of stick middle lamella towards the outer side of the primary cell wall, the deposition of material to form the secondary cell wall occurs towards the inner side of the primary cell wall only.
Earth's atmosphere is unique among the planets because it contains a large amount of ___________. A) oxygen B) helium C) methane D) carbon dioxide
The answer is A i had it on a test.
Explanation:
One treatment for high blood pressure is taking diuretics that prevent the kidney collecting ducts from reabsorbing water. How would diuretics reduce blood pressure?
B. By decreasing blood volume
When there is excess fluid in the body, it can lead to an increase in blood volume and pressure. By reducing the amount of fluid in the body, diuretics can help to decrease blood volume and pressure, which can be beneficial in treating hypertension (high blood pressure).
What are diuretics?Diuretics are medications that work by increasing the excretion of urine, which helps to reduce the amount of fluid in the body. By preventing the kidney collecting ducts from reabsorbing water, diuretics increase the amount of water that is eliminated from the body through urine.
Diuretics can also help to reduce the amount of sodium in the body, as they increase the excretion of both sodium and water. This can help to lower blood pressure, as excess sodium in the body can lead to an increase in blood volume and pressure.
Overall, diuretics are a common and effective treatment for hypertension and can help to reduce blood pressure by decreasing the amount of fluid in the body and lowering the amount of sodium in the blood.
However, it is important to note that diuretics should only be taken under the guidance of a healthcare professional and as part of a comprehensive treatment plan for high blood pressure.
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you might blink as an object speed toward your eyes.this quick reaction is an example of the nervous system interacting with the____
A.immune reaction
B.parasympathetic system
C.visual part of the brain
D.muscular system
please help
While containing small amounts of lime, soda ash and silica, glass is primarily made of what substance?
The liver can convert _____ into glucose that can be released into the bloodstream or stored as glycogen. vitamin d lactate atp fatty acids
The liver can convert lactate into glucose that can be released into the bloodstream or stored as glycogen.
Answer: Option B
Explanation:
The lactate in food is usually transported to the liver where the process of gluconeogenesis takes place, this process produces glucose that can be used in the glycolysis and the citric acid cycle to produce ATP that is the energy required for the cell to carry out various metabolic activities. Glucose is the major source of energy for any cell , any other forms of carbohydrates must be first converted to glucose to enter into the energy cycle.
explain why acid rain, smog, ocean acidification, and global warming are indirect results of air pollution.
Answer:
In all of the mentioned cases, the influence of air pollution is not directly associated with the toxicity of the gases. The ocean acidification and acid rain take place when the pollutant gases in the environment react to produce acid. Smog influences the environment by filtering out sunlight and leaving less for the plants to utilize. Global warming takes place as greenhouse gases make Earth hold more of the heat, which it had captivated from the Sun.
Air pollution releases substances like sulfur dioxide and nitrogen oxides, which lead to acid rain. Nitrogen oxides and volatile organic compounds create smog. Carbon dioxide contributes to ocean acidification and global warming.
Acid rain, smog, ocean acidification, and global warming are indirect consequences of air pollution due to the release of various pollutants into the atmosphere. Air pollution primarily involves the emission of harmful substances like sulfur dioxide (SO2), nitrogen oxides (NOx), carbon dioxide (CO2), and volatile organic compounds (VOCs) from industrial processes, vehicles, and other human activities.
1. Acid Rain: SO2 and NOx react with water vapor and oxygen to form sulfuric acid and nitric acid, which, when they fall back to Earth as precipitation, cause acid rain. This harms ecosystems, aquatic life, and infrastructure.
2. Smog: Ground-level ozone (formed by chemical reactions involving VOCs and NOx in the presence of sunlight) is a key component of smog. It irritates respiratory systems and reduces air quality.
3. Ocean Acidification: Excess atmospheric CO2 dissolves into seawater, creating carbonic acid. This lowers ocean pH, harming marine life and coral reefs.
4. Global Warming: The release of greenhouse gases like CO2 and methane traps heat in the atmosphere, leading to global warming and climate change. These indirect consequences illustrate the complex and interconnected nature of environmental issues stemming from air pollution. Addressing air pollution is critical to mitigating these environmental challenges.
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The risk of testicular cancer is greater for which group? (select all that apply) quixlet
A female client is admitted with suicidal tendencies. the client is placed in suicide precautions for the first 24 hours of her stay. ensuring client safety is included in the therapeutic role of:
The apical meristems of a plant are responsible for ________ development of pollen and ova development of the fruit a plant's increase in height a plant's increase in width
Why do endurance athletes load up on carbohydrate-containing foods before a big event? why don't they just fill up on fat and protein as well?
Which form of cell transport allows small molecules to move from an area of higher concentration to an area of lower concentration without energy being required from the cell?
The leaves of a plant appear to be green because light waves are
A) reflected.
B) absorbed.
C) both absorbed and reflected.
D) neither absorbed or reflected.
The leaves of a plant appear green because light waves are absorbed by the chlorophyll pigment.
Explanation:The leaves of a plant appear to be green because light waves are absorbed by the chlorophyll pigment in the plant cells. The chlorophyll molecules absorb the red and blue wavelengths of light and reflect the green wavelength, which is then detected by our eyes. Therefore, option B) absorbed is the correct answer.
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Which event is often associated with an earthquake? A. hurricane B. sea floor spreading C. tsunami D. flooding
The event that is often associated with an earthquake is tsunami. The correct option is C.
What is tsunami?It has the ability to create abnormally strong currents, quickly flood land, and wreak havoc.
As the tsunami travels across the ground, the force and flow of the water, as well as the debris it carries, have the potential to demolish boats, cars, buildings, and other structures, inflict injuries, and even claim lives.
A tsunami event is one that happens as a result of an earthquake.
More than 80% of earthquakes occur underwater, and because of the forces and energy created under the ocean rock, tsunamis can occasionally be caused by these earthquakes.
So, a tsunami's occurrence is an occurrence that is ten linked with an earthquake.
Thus, the correct option is C.
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Dreaming is a well-understood phenomenon. Please select the best answer from the choices provided T F
The assertion is untrue. often occur uncontrolled in the head during specific sleep periods.
What is an example of a phenomenon?Things that happen naturally—phenomena—occur or show up without human intervention. Gravity, tides, moon, planets, volcano lightening, starling swarms, ant army, sandstorms, biochemical characteristics or oscillation, among countless more events, are examples of natural phenomena.
What makes a phenomenon significant?Phenomena play a crucial role in science teaching because they provide students with concrete, captivating instances of science in action. Students can witness a phenomenon, then inquire about it and conduct research to learn about how it operates. This is a fantastic way to encourage student curiosity.
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You are preparing an injection of a narcotic to relieve a pregnant woman's pain. as you are about to give it, she asks you for a bedpan because she has to move her bowels. your best action would be to
Describe how nuclear transplantation was used to produce dolly
Name a rapid method for the identification of enterobacteriaceae
Which inheritance pattern results when parents are crossed for pure traits and the resulting offspring have traits that appear to blend?
incomplete dominance
codominance
Mendelian inheritance
polygenic inheritance
The right answer is incomplete dominance
Incomplete dominance is when hybrids of the F1 generation have an intermediate phenotype (between the two phenotypes) compared to the parental P1 generation. This phenomenon occurs in heterozygous individuals.
Example: The color of snapdragon flowers.
The pink color obtained in the F1 generation is incomplete dominance. These flowers are heterozygous. When we cross the flowers obtained in the F1 generation to obtain the F2 generation, we obtain a ratio of genotypes and phenotypes that is the same or 1: 2: 1.
In the year before trudy died, her friends and family noticed that she has become less active and more withdrawn, even in their company. trudy experienced __________.
Which of the following remains relatively constant in an ecosystem? A-number of organisms B-amount of matter C-number of species
Answer:
The correct answer would be B- the amount of matter.
The amount of matter remains the same in any ecosystem.
It can be explained with the help of the law of conversation of mass.
It states that mass can neither be created nor it can be destroyed but it can transform from one form to another.
In one family, all three children are homozygous for a recessive gene. What can be concluded about the parents?
Both parents are likely homozygous recessive as well for the gene in question, as each child inherits one allele from each parent and all children are homozygous for a recessive gene.
If all three children in a family are homozygous for a recessive gene, it can be concluded that both parents are at least carriers of the recessive allele. Given that each child has inherited two recessive alleles (one from each parent), both parents must possess at least one recessive allele each to pass on to their offspring. Since all the children are homozygous recessive, this suggests that both parents are likely homozygous recessive as well for that particular gene.
How likely are low-birth weight (lbw) babies to die before 1 year of age as compared to normal infants?
a woman with type o blood marries a man with type ab blood is it possible for their children to have O blood
Explain how the cricket frog plays an important role in limiting the spread of mosquito-borne illnesses like West Nile virus and malaria.
Where did earth's oxygen come from? select one:
a. produced by volcano exhausts.
b. produced during the formation of the moon.
c. produced by microscopic life over a billion years.
d. delivered by comets to the early earth?
_____ is a type of parasitic worm that can be transferred to humans who eat raw or undercooked fish.
a. salmonella
b. cryptosporidium
c. anisakis
d. giardia
predict what would happen to the plants if the fungi died off
Final answer:
The absence of symbiotic fungi from the soil would severely disrupt plant growth due to a lack of essential nutrient uptake, cause a build-up of undecomposed organic material, and negatively impact biogeochemical cycles and ecosystem health.
Explanation:
If symbiotic fungi were absent from the soil, the impact on plant growth would be significant. Plants form relationships with fungi, including structures known as mycorrhizae, which are critical for nutrient uptake. Fungi assist in acquiring nutrients such as phosphorus and nitrogen that plants need to grow. Without these symbiotic partnerships, plants would struggle to obtain these essential nutrients, leading to poorer growth and reduced vitality. Furthermore, fungi play a crucial role in decomposing organic matter, recycling nutrients back into the soil. Without fungi, the accumulation of undecomposed organic material would disrupt biogeochemical cycles, resulting in a build-up of carbon in dead matter and waste, and impair other nutrient cycles, such as nitrogen fixation and phosphorus release. Over time, the absence of fungi could lead to a decline in the structural diversity of forests and other habitats, negatively impacting the broader ecosystem and potentially leading to the extinction of numerous species.
Home to the Southern Watershed, located in southeastern Virginia and making up the southern portions of the cities of Chesapeake and Virginia Beach, this is one of the most biologically diverse regions of the state. This area supports more than 40 rare plant species and 10 terrestrial, estuarine, and palustrine wetland communities. Within these ecosystems, the fishing industry prevails and the economic value of the annual commercial fishing harvest is about $500 million. But the mix of the catch is changing and several valuable commercial aquatic species of the Bay have declined over the years. What is the MOST LIKELY reason for this decline in aquatic species in Virginia's Southern Watershed?
Answer:
I agree with Damianvaldes201. The answer is overfishing
Explanation: