Final answer:
Prokaryotes predate eukaryotes according to the endosymbiotic theory which posits that eukaryotic cells evolved from prokaryotic cells forming symbiotic relationships. This theory is supported by the presence of prokaryote-like DNA in organelles like mitochondria and chloroplasts and fossil evidence that suggests prokaryotes were already present on Earth billions of years before eukaryotes evolved.
Explanation:
Scientists believe that prokaryotes existed earlier than eukaryotes based on the endosymbiotic theory, which suggests that eukaryotic cells evolved from a symbiotic relationship between two or more prokaryotic cells. This is further supported by mitochondria and chloroplasts having their own DNA similar to free-living prokaryotes and features such as double membranes and genes that are more closely related to those found in prokaryotes. According to the endosymbiotic theory, these organelles were once independent prokaryotic organisms that became permanent residents within larger host cells, leading to the evolution of eukaryotes. As eukaryotic cells are now known to possess complex internal structures and organelles, which presumably evolved through these endosymbiotic events, it is logical to infer that simpler prokaryotic cells predated them. The first eukaryotic cells are thought to have evolved about 2 billion years ago, much later in Earth's history compared to the ancient lineage of prokaryotes.
Question 17 of 25
1 Point
What distinguishes a direct democracy from a representative democracy?
O
A. In a direct democracy, power is inherited rather than allocated
through elections.
B. In a direct democracy, voting rights are universally held.
O
C. In a direct democracy, citizens are involved in all issues.
O
)
D. In a direct democracy, representatives are responsible for day-to-
day governing.
SUBMIT
In a direct democracy, power is inherited rather than allocated through elections.
Answer: Option A
Explanation:
Direct democracy means where the citizens can participate in making decisions. Here citizens possess the right to vote against issues instead of a candidate or party. Here everyone has the right to take decisions. It’s a participatory kind of democracy where the decisions are affected by the people.
If a group is affected because of an issue they can directly apply for a recall. Here the direct interaction of people plays a vital role. In most countries this direct democracy is not in practice as it was outsmarted by bunch of elites who wanted to monopolize power.
This is the process in which two chromosomes exchange DNA during prophase of meiosis.
Answer:
The process in which two chromosomes exchange DNA during prophase of meiosis is called HOMOLOGOUS RECOMBINATION
Explanation:
This process occur in the prophase 1 of meiosis where DNA exchange occurs
Difference between Flora and Fauna.
Answer:
Explanation:Flora includes all organisms that may synthesize its food itself and are often immobile, they mainly comprise of all plants, trees, shrubs while fauna are categorised to be organisms that have to acquire meals and and are usually mobile and feed on other living organisms themselves.
Answer: Flora refers to vegetation (plants, fungi, algae) in a particular area, but Fauna refers to the animals living in a particular area. Flora cannot move from one place to another, whereas fauna can.
Explanation:
Which of the following environmental problems could be solved by reducing the amount of packaging that people need to throw away?
A.
an oil spill pollutes water supplies
B.
a landfill is filling up too quickly
C.
a river is polluted with pesticide
D.
burning coal produces air pollution
Answer:
B
Explanation:
Because packaging is thrown into landfills so the landfill would fill up slower if less packaging was being put in it.
Final answer:
Reducing packaging would help solve environmental problems related to landfills filling up too quickly but does not directly address issues like oil spills, river pesticide pollution, or air pollution from burning coal.
Explanation:
Reducing the amount of packaging that people need to throw away would most directly solve the environmental problem where a landfill is filling up too quickly. By minimizing packaging waste, we conserve resources and produce less trash that ends up in landfills. Excessive trash in landfills can be problematic, as it uses valuable land resources and takes hundreds of years for materials like plastic bottles to break down, potentially leading to environmental pollution. In contrast, reducing packaging would not directly address issues like oil spills polluting water supplies, rivers polluted with pesticides, or air pollution from burning coal as these issues arise from different sources and activities.
a mechanism of evolution that suggest changes in the gene pool of a population are due to chance is
Answer:
b
Explanation:
Enzymes___chemical reactions
Answer:
Enzymes aren't changed or used up in the reactions they catalyze, so they can be used to speed up the same reaction over and over again. Each enzyme is highly specific for the particular reaction is catalyzes, so enzymes are very effective.
Explanation:
Catalysts
Answer:enzymes are proteins that regulate chemical reactions.
Explanation:
Bottled water companies and many other industries remove
water from a ground source and transport it away. What
problems arise from this?
Answer:
With media exposing a lot of water companies day by day, the concerns related to bottled water are increasing at a high rate.
In some cases, it has been proved that bottled water is actually tap water. Some other cases prove that bottled water companies draw underground water and transport it away without testing of the water. Ground source of water might be considered to have pure water but it still can have mud of infectious agents. Hence, it should be properly tested before sending them to the market.
After a search of nucleotide sequence databases, researchers identified an IRE in the 5c untranslated region of a gene encoding aconitase, an enzyme involved in the Krebs cycle.
Which of the following pieces of experimental evidence best supports the claim that the synthesis of aconitase is controlled by a mechanism similar to ferritin regulation?
fin
After a search of nucleotide sequence databases, researchers identified an IRE in the 5' untranslated region of a gene encoding aconitase, an enzyme involved in the Krebs cycle. Which of the following pieces of experimental evidence best supports the claim that the synthesis of aconitase is controlled by a mechanism similar to ferritin regulation?
(A) IRP binds to aconitase mRNA in the presence of iron.
(B) The relative amount of aconitase protein increases in the presence of high levels of iron. NADH and FADH2, increase in the presence of high levels of iron.
(C) Oxygen consumption by cells increases.
(D) The levels of reduced electron carriers.
Answer:The relative amount of aconitase protein increases in the presence of high levels of iron. NADH and FADH2, increase in the presence of high levels of iron which best support the claims.
Option B
Explanation:Iron induced toxicity deals with the excess intracellular iron. The excess amount of iron are binded by Ferritin that is an intracellular iron storage. The cells are protected from the iron induced toxicity by the presence of ferritin.
When the iron levels are high, the intracellular iron binds to the IRP. The iron-IRP dislocates from IRE releasing ribosomes to proceed with the translation of ferritin mRNA. When iron levels are low, a repressor of translation, iron response protein (IRP), binds to an iron response element (IRE), which is a stem-loop structure near the 5' end of ferritin mRNA.
DNA is typically found in cells in the form of a very long strand that is coiled many
times and contains thousands or millions of nitrogen bases. Which term
describes this very long molecule of DNA?
Answer:
This very long molecule of DNA is called chromosome.
Explanation:
Chromosome is a 'DNA molecule' that contains part or all of the genetic material of an organism. The 'three-dimensional genome structure' of chromosome plays a vital role in 'transcriptional regulation'.Prokaryotes have less sequence-based chromosome structure than eukaryotes. The recombination of chromosome during meiosis and successive reproduction plays a significant role in 'genetic diversity'. Chromosomes are normally visible under microscope during the metaphase of cell division. Chromosomes are the key elements of cell division.By the end of prophase, each of the following has occurred except ____.
Question 7 options:
tighter coiling of the chromosomes
breaking down of the nuclear envelope
disappearing of the nucleolus
lining up of chromosomes in the cell
Answer:
Lining up of chromosomes in the cell .
Explanation:
Prophase begins with the Thickening of chromosome. Chromosomes are clearly visible inside the nucleus. each chromosome splits longitudinally to form two chromatids.
The centriole in the centrosome of animal cell divides into two. The centrosphere set the centrioles free. Centrioles develop very fine eye-lash like thread called aster rays. the two asters start moving towards the opposite poles. By the end of prophase they reach at the opposite poles.
The vertical distance from the crest of the wave to the trough of the wave is 4 meters. What is the amplitude of the wave?
Answer:
2 meters
Explanation:
The amplitude of a wave is half the distance from the crest to the trough of that wave.
Audrey woke up and decided to go to the bakery for breakfast. When she walked through the door, the smell of blueberry muffins caused her to begin salivating. Which of Audrey's neurons detected the smell of the muffins?
Answer:
Sensory neurons detected the smell of muffins.
Explanation:
Sensory neurons can be described as a group of neurons which convert stimulus from the external environment of the organism into an electrical impulse. Sensory neurons are also known as afferent neurons. there are different types of sensory neurons to detect different types of environmental stimuli. The sensory neurons which are used for smelling are termed as olfactory sensory neurons. Hence, the sensory neurons helped Audrey to detect the smell of muffins.
Prison are infectious particles that cause other proteins to?
Answer:
Prions are infectious agents which are responsible for neurodegenerative diseases in animals. Prions cause the refolding of the alpha helical and coil forms of protein structure into beta sheets.
Explanation:
The alpha sheets and coil structures assume helical structures and therefore would give different physiological properties to protein. When they are converted into beta sheets, which are flat and parallel, the structure and function of the protein get altered.
The cellular form of the protein is sensitive to proteases whereas the misfolded protein is not affected by proteases. The misfolded form perpetuates itself by causing the newly synthesized normal form of protein to become degenerate.
Kuru was the first disease caused by prion in humans.,
Sulfites may be found _____.
naturally occurring in wine
as a preservative in hamburger
as a preservative on fruits
as a preservative in cooked vegetables
Answer:
as preservatives on fruits
Explanation:
Answer:
NATURALLY OCCURING IN WHINE EDG 2021
Explanation:
Answer above is wrong (at this time it is at least) I PUT THEIR ANSWER AND WAS WRONG AND IT TOLD ME THIS WAS THE CORRECT ANSWER
Where do animals obtain carbon?
a.
the atmosphere
b.
plant and animal consumption
c.
the soil
d.
photosynthesis
Please select the best answer from the choices provided
A
B
C
D
Answer:
B
Explanation:
Answer:
B
Explanation:
Animals absorb carbon and energy by eating plants or other animals.
Select the correct answer.
Why might two elements possess similar chemical properties?
A.
They belong to the same group of the periodic table.
B.
They have the same physical state,
C.
They have similar physical properties.
D. They belong to the same period of the periodic table.
Rasat
Next
Answer:
The answer is: A. They belong to the same group of the periodic table.
Explanation:
Chemical properties of an element are determined by the number of electrons in its valence shell; also known as its electronic configuration. Elements that belong in the same group of the periodic table possess similar chemical properties due to similarity in the number of valence electrons.
Which was concluded by Mendel as a result of his genetic research?
Answer:
Which of the following was concluded by Mendel as a result of his genetic research? Genes for different traits are inherited independently of one another. Nondisjunction can result in the formation of a zygote with three copies of a chromosome.
Explanation:
The conclusion by Mendel as a result of his genetic research is that genes for different traits are inherited independently of one another. Non disjunction can result in the formation of a zygote with three copies of a chromosome.
What is the best example of a hypothesis leading to new experimental methods?The best example of a hypothesis leading to new experimental methods as the Thomas Hunt Morgan continued the genetic research of Gregor Mendel, but Morgan used fruit flies.
The best example of a hypothesis leading to new experimental methods is that the Thomas Hunt Morgan continued the genetic research of Gregor Mendel, but Morgan used fruit flies.
Through Thomas Hunt Morgan's fruit fly experiments, he was able to discover and notice the inheritance of specific chromosomes. This experiment gave Mendel a great opportunity to publicize his idea of studying humans.
Therefore, The conclusion by Mendel as a result of his genetic research is that genes for different traits are inherited independently of one another. Non disjunction can result in the formation of a zygote with three copies of a chromosome.
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a single celled paramedic is placed in a hypotonic solution.what will happen to the cell?
When a single celled paramedic is placed in a hypotonic solution, the cell swells and then bursts.
Explanation:Hypotonic solutions are the solutions that contain more water than present in a cell. Hence, when an animal cell is placed in a hypotonic solution, the cell will undergo osmosis. Osmosis is the movement of any form of solvent through a plasma membrane to a higher concentration from a lower concentration until the the external concentration matches the inner one.
To put it in simple words, when a single animal cell is places in a solution which has more water than other solutes, the water will invade the cell until it can accumulate the amount that equalizes the inner and external concentration. The cell will begin to swell up until there is no more space and finally, it will burst. For example, when you put water on a cloth that has blood stain on it, the cells will burst and make the stain worse than before.
Which of these increases the amount of carbon in the atmosphere?
O A. animals eating plants
OB. burning of fossil fuels
OC. fossilization
OD. photosynthesis
Answer:
B. burning of fossil fuels
Explanation:
This method releases carbon dioxide which increases the amount of carbon in the atmosphere.
Answer:
b. burning of fossil fuels.
Explanation
fossil fuels produce large quantity of carbon di oxide when we
burned .carbon emission trap heat in the atmosphere and lead to climate change.
What is the purpose of mitosis?
Question 9 options:
create genetic diversity
increase cell volume
produce new offspring
replace damaged cells
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The correct option would be D. replace damaged cells.
Genetic diversity would apply to meiosis not mitosis.
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Answer: Replace damaged cells
Explanation:
There are many many stars in the universe in which of the following do all stars appear to be quite similar A. chemical composition B. temperature C. distance from our solar system D. size
Answer:Chemical Composition
Explanation:
none of the others make even the simplest of sense.
describe 3 ways in which materials are transported across the cell membrane
(When molecules move in this way, they are said to move down their concentration gradient.) Three common types of passive transport include simple diffusion, osmosis, and facilitated diffusion. Simple Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
51. Surface processes related to the effects of wind are called
Answer:
Surface processes related to the effects of wind are called EROSION
Explanation:
Erosion is the removal of top soil, dissolved minerals, rocks from one location to another
24. Which organism would occupy the
organism would occupy the level on an energy pyramid with the most energy?
a.Krill balgae C.killer whale d.leopard seal
Answer:
The organism to have maximum energy would be the algae since ii will be at the lowest level. so the answer is 'B'.
Explanation:
The pyramid of energy shows the flow of energy from one trophic level to other. The lowest trophic level is occupied by the producers. In this case algae acts as the producer. Krill acts as the primary consumer, followed by leopard seal as the secondary consumer and finally killer whale as the tertiary consumer. The lowest trophic level contains maximum energy.
As we go upwards, only 10% of the energy gets transferred to the next trophic level.
Final answer:
The organism occupying the level on an energy pyramid with the most energy is typically a producer. In the provided options, option b. algae, as a producer, would have the most energy available to it.
Explanation:
The organism that would occupy the level on an energy pyramid with the most energy is typically a producer. In an energy pyramid, energy decreases as it moves up each level, starting with the most energy at the base with producers and the least energy at the top with apex predators. Therefore, in the options provided, option b. algae, being a producer, would occupy the level with the most energy. Organisms like krill are primary consumers and eat producers like algae. Small fish are secondary consumers and eat primary consumers like krill. Seals are tertiary consumers and would feed on secondary consumers like small fish. Apex predators, such as killer whales, occupy the highest trophic level and would therefore have the least amount of energy available to them in the energy pyramid because of energy loss at each trophic transfer.
Will give brainliest plz help
Answer:
The correct option is a) the greatest reaction for this enzyme will be in tubes 4 and 5.
Explanation:
As the information in the question shows, the enzyme was isolated from a bacterium which is adapted to live in hot springs where the temperature range is 50 to 80 degrees Celsius. Hence, we can deduce that the enzymes in this bacteria work best at this temperature range or his temperature range can be considered to be optimum for the enzymes of this bacteria. Hence, the greatest reactions will be seen in the tubes 4 and 5 as the temperature will be perfect for the working of the enzyme.
1. Which of the following best explains why a cell needs ATP?
Answer:
Explanation: rnvnuvibleruvbvuheowibvuivwencjerijedneieru freck you
Why is it difficult to eliminate a recessive allele that expresses a detrimental trait?
Answer:
It is difficult to eliminate a recessive allele that expresses a detrimental trait because the carriers are usually asymptomatic & the disease is not phenotypically expressed until it is present as a homozygous pair.
This has been one of the many challenges of Eugenics.
Explanation:
DNA is composed of strands of nucleotides that
pair in regular patterns and are held together by
the forces shown in the diagram below.
Arb
POUP
Pidres
Su
Thy
What forces, represented by dotted lines, hold
together the two strands of DNA shown in the
diagram above? (3.2)
A. Ionic bonds
B. Covalent bonds
C. Hydrogen bonds
D. Carbon-carbon bonds
Answer:
C. Hydrogen Bonds
Explanation:
Answer:
C. Hydrogen bonds
Explanation:
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What organ within a common plant starts the process of transpiration?
Stomata is organ within a common plant which starts the process of transpiration.
Explanation:
Water is released by plant in water vapor or moisture form is known as transpiration. In the process of transpiration, a very little amount of water is absorbed by root and left out water is evaporated in the atmosphere.
Transpiration can be of different types. The most common is stomatal transpiration. It is in the pores of the plant leaves. Here from plant about 80% to 90% of water is lost from plant. Transpiration is affected by climate. Stomata Distribution also affects transpiration
what is meant by social cost
Answer:
Social costs are private costs borne by individuals directly involved in a transaction together with the external costs borne by third parties not directly involved in the transaction.
Explanation:
Answer:
Social costs are private costs borne by individuals directly involved in a transaction together with the external costs borne by third parties not directly involved in the transaction.
Explanation: