Answer:
Asteroid impacts were uncommon when life is presumed to have begun.
Explanation:
The hypothesis about the origins of life on Earth are based upon the asteroid impacts. Basically, the hypothesis suggests that the asteroids brought the basic ingredients for the development of life on our planet. If a discovery is made though that in the period when life occurred the asteroid impacts were lacking, then this hypothesis will fall into water. This is because the hypothesis is directly dependent on the asteroid impacts, so if the case was that there weren't, or were very rare, the hypothesis will lose its basis.
Answer:
Asteroid impacts were uncommon when life is presumed to have begun.
Explanation:
For many years, there was extreme heat on our planet. The oceans were warm and shallow, Earth's primitive atmosphere containing carbon dioxide, water, and other gases that made the earth an inhospitable environment. In addition, lightning was common on early Earth.
The high temperature of the earth was due to the many volcanic activities, which caused the release of gases and lava. The atmosphere and the earth's surface were characterized by the absence of the ozone layer, the effects of ultraviolet rays and lightning strikes, and the bombardment of bodies from space, that is, asteroid impacts were common on primitive earth, including these impacts. responsible for the beginning of life. It is well known that most of the carbon and water molecules in existence today originated from asteroids that fell on Earth during this period.
Prokaryotes are classified as belonging to two different domains. What are the domains?
Answer:
Bacteria and Archaea
Explanation:
The prokaryotes are classified into two domains, the bacteria and the archaea domains. This makes them unique as the other organisms fall into one of the three domains, not in two of them. The prokaryotes come in many different shapes. They all do fall into three categories, bacilli (which are the rod-shaped prokaryotes), spirilli (which are the spiral-shaped prokaryotes), and cocci (which are the spherical shaped prokaryotes).
Prokaryotes are classified into two domains: Bacteria and Archaea. These domains include unicellular organisms without nuclei or other complex structures, but they differ in genetic composition and sequences, cell wall structures, and lipid composition.
Explanation:The two domains that prokaryotes are classified into are Bacteria and Archaea. Both of these domains include unicellular organisms lacking a nucleus and other complex organelles, hence falling under the category of prokaryotes. However, they differ significantly in their genetic composition and sequences, cell wall structures, and lipid composition. For instance, bacteria have peptidoglycan in their cell walls, while archaea do not.
Bacteria, the most well-known and studied category of prokaryotes, are incredibly diverse in terms of habitats, ranging from human skin to hot springs to the deep ocean. On the other hand, Archaea are extremophiles, thriving in extreme conditions like high temperatures, salinity or acidity, where most other life forms cannot survive.
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G1 is associated with which of the following cellular events?
The correct option is e.
The G1 phase of the cell cycle is associated with normal cell growth and function, where the cell grows, carries out metabolic functions, and prepares for DNA replication. Other cellular events like DNA duplication and organelle duplication also occur during this phase. However, the breakdown of the nuclear membrane and the beginning of mitosis happen in different phases.
Explanation:The G1 phase, also known as the gap 1 phase, is the first of four phases in the cell cycle. This phase is associated with the normal growth and function of a cell. During this phase, the cell grows in size, carries out normal metabolic functions, and prepares for DNA replication that occurs in the following S phase, also known as the synthesis phase.
The G1 phase is essential for DNA duplication, organelle duplication, and an increase in cell size. It should be noted that the breakdown of the nuclear membrane, the beginning of mitosis, and all of the other responses mentioned in the question do not occur during the G1 phase. Instead, these events happen during different phases of the cell cycle.
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The complete question is here:
G1 is associated with which of the following cellular events?
A. break down of the nuclear membrane
B. DNA replication
C. the beginning of mitosis
D. all of the responses are correct
E. normal cell growth and function
The G1 phase is associated with E. normal cell growth and function.
The G1 phase, also known as the first gap phase, is a part of the cell cycle where the cell grows and performs its normal functions. It is not primarily involved in DNA replication, the breakdown of the nuclear membrane, or the beginning of mitosis.
Instead, during G1, the cell engages in metabolic activities, increases its supply of proteins, and grows in size to prepare for DNA replication, which occurs in the subsequent S phase.
Correct question:
G1 is associated with which of the following cellular events? A. break down of the nuclear membrane B. DNA replication C. the beginning of mitosis D. all of the responses are correct E. normal cell growth and function
Two critical interventions to help turn around the opioid crises are:
Answer:
The two critical interventions to help turn around opioid crisis are:
Improve access to prevention, treatment, and recovery support services to prevent the health, social, and economic consequences associated with opioid misuse and addiction, and to enable individuals to achieve long-term recovery. Strengthen public health data reporting and collection to improve the timeliness and specificity of data, and to inform a real-time public health response as the epidemic evolves. Advance the practice of pain management to enable access to high-quality, evidence-based pain care that reduces the burden of pain for individuals, families, and society while also reducing the inappropriate use of opioids and opioid-related harms.what is true of the supply of petroleum on the earth today
A. It is a limited supply
B. It forms as quickly as we use it
C. It is being replenished at a rapid rate
D. It is in constant supply
Answer:
A. It is a limited supply
Explanation:
Petroleum is one of the fossil fuels that originates from dead and decaying organisms in basins of deposition. For petroleum to form, several geologic,biologic and chemical factors must be accurately in place. These factors takes a huge amount of time in geologic time scale to form. The petroleum in the crust today formed several millions of years ago.
With this knowledge, petroleum is a non-renewable resource. It was central to the industrial revolution and the modern world was built around the oil industry. Exploration and production of petroleum provides oil for industrial and domestic use. Formation of petroleum takes millions of years and so, it is not renewable in our life time. It would take several years for the oil being used today to be replenished provided all the factors are in play.
This makes oil a limited resource constantly being depleted and not easily replenished.
Organisations like OPEC(Organisation of Petroleum Exporting Countries) comes together to ration production and supply so as to keep oil consumption in check.
Answer:
A. It is a limited supply
Explanation:
How are viruses different from eukaryotic cells?
Answer:viruses are on the borderline of love and non living. This they couldn't be concluded as singl cell organisms.
Explanation:
Viruses and eukaryotic cells differ in their structure, reproduction capabilities, and consideration as living organisms. Viruses have a simpler structure, can't reproduce independently, and are debated to be non-living. On the other hand, eukaryotic cells have a complex structure, reproduce on their own, and are certainly alive.
Explanation:In comparing viruses and eukaryotic cells, one primary distinction is their structure. Viruses are significantly simpler, composed mainly of a protein shell surrounding their genetic material, which can be DNA or RNA. In contrast, eukaryotic cells are more complex. They contain multiple, specialized structures called organelles, including a nucleus that houses their DNA.
Additionally, viruses do not possess the cellular machinery necessary for reproduction. They must infect a host cell and usurp its reproductive mechanisms to replicate, adopt a parasitic lifestyle. This vital dependence on host cells for reproduction makes viruses obligate intracellular parasites. Eukaryotic cells, on the other hand, can reproduce on their own through processes such as mitosis and meiosis.
Ultimately, one of the most contentious differences revolves around the nature of life itself. Many scientists argue that due to their lack of key characteristics such as a cellular structure and the ability to reproduce independently, viruses should not be considered living organisms. Eukaryotic cells, by contrast, are undeniably alive as the foundational units of all large, multicellular organisms.
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During which phase do organelles duplicate and centrosome replication begin
The organelles and centrosome of the cell replicates during the interphase stage of mitosis.
What is mitosis?Mitosis is the type of cell division in which one cell divides into two identical daughter cells that are genetically similar.
Mitosis is composed of the following phases:
InterphaseProphaseMetaphaseAnaphaseThe interphase stage is also called the resting stage. This is the stage where organelles and centrosome replicates prior to the nuclear division.
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What's developed as a result of the electron transport chain?
A. Membrane potential
B. New cells
C. Proton gradient
D. Phospholipid bilayer
Answer:
C. Proton gradient
Explanation:
During electron transport chain, the electrons are comes from transport chain come from NADH and FADH₂. As electrons are travels down the chain, proton gradient develops across the inner mitochondrial membrane due to accumulation of high proton (H⁺) in the intermembrane space and a lower proton(H⁺) in the matrix. This proton gradient is used to syntheis ATP.
Answer:
proton gradient
Explanation:
Osmosis (pick the incorrect statement) Osmosis is the passive transport of water from an area of low solute concentration to an area of high solute concentration. The movement of water across a cell membrane requires transmembrane integral proteins. The osmotic pressure between two compartments is determined by the relative concentrations of the permeant solutes in the compartments. Cells regulate water and ion balance by actively transporting ions but not water.
Answer:
Cells regulate water and ion balance by actively transporting ions but not water.
Explanation:
Cells regulate water and ion balance by transporting the water molecules from a region of of high concentration to a region of low concentration passively. Active transport does not maintain the water and ion balance, so the last statement is incorrect.
Rest of the statements are correct.
In the first statement they are saying that in osmosis water from an area of low solute concentration moves towards an area of high solute concentration which is absolutely right. An area which has a low solute concentration has a high solvent concentration and vice versa. In osmosis, only solvent can move because osmosis occurs by means of a semi permeable membrane which does not let a solute molecule to pass by. So the area where solute is less, solvent is more and this solvent tends to move towards an area which has high solute concentration because a high solute concentration will have low solvent concentration .
Second statement is also correct. water cannot cross cell membrane because water is polar while cell membrane is non polar. Non polar cell membrane does not let water to pass through it because water is polar therefore water requires integral proteins named as aquaporins to cross cell membrane.
Statement third is also correct. The osmotic pressure is a measure of solute concentration of a particular compartment. The less is the solute in a compartment, the more will be the osmotic pressure. That simply means that osmotic pressure of a pure solvent will be highest because it does not have solute at all. In contrast to this, a solution will have comparatively low osmotic pressure because of the presence of solute in it.
The incorrect statement about osmosis is that water movement across a cell membrane requires transmembrane integral proteins. In reality, water can pass through the cell membrane via osmosis without the need for proteins. Osmosis maintains solute equilibrium on both sides of the membrane.
Explanation:The incorrect statement in your options about osmosis is that: The movement of water across a cell membrane requires transmembrane integral proteins. In truth, water can pass through the cell membrane via a process called osmosis without the need for proteins. Osmosis is the passive transport of water molecules from an area of low solute concentration to an area of high solute concentration. The aim is to maintain equilibrium in the solute concentration on both sides of the membrane. The osmotic pressure difference between two compartments is created by the relative concentrations of solutes that can pass through the membrane, known as permeant solutes. Cells do actively regulate ion balance and water via different mechanisms, not just by transporting ions.
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What is the function of a bacterium's capsule?1. protein synthesis2. DNA storage3. propulsion4. protection5. adhesion
Answer:
4
Explanation:
capsule prevents the bacteria cell from engulfment by eukaryotic cells
The function of a bacterium's capsule is protection.
The bacterium's capsule encompasses any polysaccharide and / or protein surface layer (including the S-layer of eubacteria), but excludes the S-layers that make up the cell wall of archaebacteria.
The capsule protects the bacteria from phagocytosis, the main defense mechanism used by the host in the presence of capsulated bacteria.
An effective response to defend against this type of bacteria involves the production of antibodies that specifically bind to the capsule, facilitating opsonization and phagocytosis.
Therefore, we can conclude that the bacterium's capsule is generally polysaccharide in nature, it is an outer layer of material, which protects the bacteria from the desiccation of the environment.
.
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The intervention of extraterrestrials has been used to explain the Bermuda Triangle, a region of the Atlantic Ocean where ships and planes are frequently lost, leaving no evidence behind. How would this explanation best be characterized?
Final answer:
The explanation of extraterrestrial intervention in the Bermuda Triangle can best be characterized as a conspiracy theory. Claims of UFO sightings can usually be explained as natural phenomena, human craft, or hoaxes. It is important to approach these theories with skepticism and rely on evidence-based explanations.
Explanation:
The explanation of extraterrestrial intervention in the Bermuda Triangle can best be characterized as a conspiracy theory.
Although there have been numerous stories and video evidence of strange objects in the sky, there is no scientific evidence or peer-reviewed accounts of extraterrestrial life forms visiting Earth. Claims of UFO sightings can usually be explained as natural phenomena, human craft, or hoaxes.
It is important to approach these theories with skepticism and rely on evidence-based explanations.
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Which of the following best describes a viral infection, such as the common cold?
A. Virus grow and develop in the body.
B. Virus are living organisms.
C. Viruses require host cells in the body.
D. Viruses can be treated with antibiotics.
Answer:
C. Viruses require host cells in the body.
Explanation:
Answer: C. Viruses require host cells in the body
Explanation:
what do we call a specific variant of a character?
A.gene
B.trait
C.locus
Answer:
Trait
Explanation:
We call a specific variant of a character a phenotypic trait.
A chemical reaction between iron atoms and oxygen molecules can only occur if
Answer:
Here is the full statement: A chemical reaction between iron atoms and oxygen molecules can only occur IF THERE ARE EFFECTIVE COLLISIONS BETWEEN THE PARTICLES OF THE TWO ELEMENTS.
Explanation:
Chemical reaction involves the re-arrangement of the particles that are present in the reacting substances. During the course of reaction, the particles of reactant are broken down and rearrange to form the products. For a chemical reaction to occur, the particles of reactants must be broken down and they must undergo effective collision. Effective collision between the atoms of iron and oxygen will give rise to the product, which is hydrated iron (lll) oxide. Without collision, chemical reaction will not occur and the product will not be formed.
What are male reproductive cells in a plant called?
A.egg
B.pollen
C.stem
D.sperm
Answer:
Pollen
Explanation:
Males produce pollen in the stamen, which contains the male reproductive organs.
Answer:
B. pollen
Explanation:
Male reproductive cells in a plant are called pollen.
if i explore two oceanic plates at a convergent boundary , i will observe :
A. faults
B. ocean formation
C. island chains
D. seafloor spreading
Answer:
D. seafloor spreading
Explanation:
If you explore two oceanic plates at a convergent boundary , you will observe seafloor spreading.
Answer:
Option C, island chains
Explanation:
In convergence of two geographical boundaries, one slips (sub ducts) below the other while moving towards each other. This leads to formation of subduction zone. In the subduction process, when two oceanic plate converge, volcanic islands are formed. These volcanic islands are formed in a linear chain format and hence are known as volcanic arc for example Marians, Aleutians, etc.
Hence, option C is correct
How are unicellular organisms similar to multicellular organisms?
Answer: Unicellular and multi cellular organisms have some similarities and differences between them. The similarities between the two are listed below:
1.One big similarity between unicellular and multi cellular organisms is that the two of them are made up of cells.
2. The two organisms have similar genetic codes; both type of cells has DNA as hereditary material. The genetic code is universal and DNA sequence from a unicellular organism can be reproduced by a multi cellular organism and vice versa.
3. Both unicellular and multi cellular organisms have the same type of cell membrane. The cell membrane are made from phospholipids and they also incorporate different types of proteins.
4. Both organisms also have ribosomes in their cells. The ribosomes are responsible for the synthesis of proteins. Both cells synthesis proteins.
5. Both type of organisms have to obtain energy and nutrients to sustain their growth and energy.
Unicellular and multicellular organisms are similar as they all begin life as a single cell and can carry out all life processes essential for survival. However, unicellular organisms perform life processes independently, without the need for specialized cells while multicellular organisms have specialized cells performing specific functions, organized intricately into tissues and organ systems. Despite differences in complexity, all organisms showcase nature's incredible adaptability.
Explanation:Unicellular and multicellular organisms share similarities despite their complexities of cellular organization. They are similar in the sense that, whether single-celled or multi-celled, all organisms begin life as a single cell, formed by the union of two cells, the ovum and the sperm. Moreover, all life forms exhibit a cellular structure and have the ability to carry out all life processes essential for survival.
Despite carrying out the same life processes, the way they do so differs greatly. Unicellular organisms have components functionally analogous to the organs of multicellular organisms, enabling them to perform functions similar to more familiar organisms. They are essentially independent-living, carrying out life processes such as metabolism and respiration without help from other cells.
On the other hand, multicellular organisms achieve life processes through division of labor. They have specialized cells that perform specific jobs. Furthermore, in multicellular organisms, different types of cells are produced, effectively organized into tissues, organs, and organ-system to form a complete organism. This requires a more complex developmental process.
Despite the difference in complexity, unicellular and multicellular organisms both show an extraordinary demonstration of nature's ingenuity and adaptability, showcasing their abilities to perform the essential functions of life in their unique ways.
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Which structure is found in the cytoplasm of a prokaryotic cell
Is a protein a monomer or a polymer?
a. Polymer
b. It depends
c. Monomer
Answer:
a protein is a monomer...
Imagine that you are walking through a forest on a chilly day, and you can clearly hear the fallen leaves crunch underfoot. this forest would be located __________.
Answer: This forest would be located in somewhere like rio
Explanation:
Why are well-defined reading frames critical in protein synthesis? A. Without a well-defined reading frame, the mRNA would be transcribed back into DNA. B. Without a well-defined reading frame, the ribosome is unable to bind to the mRNA. C. Without a well-defined reading frame, the peptide made from a given sequence could be completely different. D. Without a well-defined reading frame, the resulting protein would be transported to the cell surface.
Answer:
C
Explanation:
During the translation of an mRNA, it is read in a sequence of three nucleotides called codons. Therefore, a single strand of DNA or RNA will have three reading frames. Only one is biologically relevant and is referred to as the open reading frame because it is translated to the ideal protein. A shift in the reading of the frame can result in a wrong peptide.
what is required in the genotype of an individual to show a recessive trait?
A.two recessive alleles
B.at least one recessive allele
C.no recessive alleles
Answer:
A. Two recessive alleles
Explanation:
A dominant trait is like a school bully it knocks back the recessive trait (Bb) to where it can not be seen so the spotlight is all on the dominant trait however if there are two recessive traits (bb) they can be seen because the bully is not around to push them back.
What did Mendel's experiments with pea plants show?
A. How traits are passed between generations
B. How the plants produce their seeds
C. How the plants produce their offspring
D. How traits can be acquired in organisms
Answer:
Mendel's experiments showed How traits are passed between generations
Did you know:
Mendel is often considered the Father of Genetics
because of his experiments with pea plants.
. A squirrel population lives in an area. Over many years, a river in that area grows wider and stronger, eventually forming a canyon. The squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. This is an example of
Allopatric speciation. A population of squirrels lives in one area.
Over many years, a river in this area gets wider and stronger, eventually forming a canyon.
The squirrel populations on either side of the canyon are no longer able to mate with each other and eventually form distinct species.
What is the population density of squirrels?
The average squirrel density was estimated from the dray density using an average of 4.5 drays per squirrel (after Wauters & Dhondt, 1988).Learn more about squirrel population here.
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(Earth science isn’t an option for subject) Which statement about the types of fronts is correct?
A.) Cold fronts are characterized by extensive cloudiness and light precipitation.
B.) stationary fronts are characterized by weather similar to both warm fronts and cold fronts.
C.) Stationary fronts usually are associated with light precipitation and light cloud cover
D.) warm fronts are associated with clouds, showers, and thunderstorms.
Answer:
D. ) warm fronts are associated with clouds, showers, and thunderstorms
Explanation:
The warm fronts are the fronts that gradually replace the cold fronts. They tend to warm and moist. Their warmth and humidity comes from the place of their formation, which is above the large bodies of water in the lower latitudes. Because they are warm and moist, the warm fronts bring in warmer weather conditions, but also lot of clouds, intensive precipitation, and very often thunderstorms as well. In most cases, the direction of movement of this type of fronts is from southwest to northeast.
Susan is planting her garden and choosing plants at the local plant nursery. She tells the clerk that she wants to plant perennials in her front garden bed. How often is Susan expecting the plants that she chooses to germinate and flower? A. Grow into larger, permanent trees and shrubs
B. Sprout every year for two years
C. Sprout every year, year after year
D. Sprout this year and need to be replanted
Answer:
c)Sprout every year, year after year
Explanation:
A perennial plant or simply perennial is a plant that lives more than two years. Some sources cite perennial plants being plants that live more than three years. The term is often used to differentiate a plant from shorter-lived annuals and biennials.
Answer:
Option C
Explanation:
Perennial means something that is not permanent or it comes after an interval.
Perennial plants are the plants that sprout every year which means they grow and survive for one year and then they die. The next year they sprout again from the seeds that were produced the last year and were able to germinate.
Some common example of perennial plants are -
Hibiscus, Lilies, Daisies, Lavender, Rose Bushes etc.
When using food additives in food to help extend its shelf life an operation must first?
When one DNA molecule is copied to make two DNA molecules, the new DNA
contains
A) 25% of the parent DNA.
B) 50% of the parent DNA.
C) 75% of the parent DNA.
D) 100% of the parent DNA.
E) none of the parent DNA.
17. How does active transport differ from all other forms of transportation?
A. It shifts from high to low
B. It maintains homeostasis
C. It creates an equilibrium shift
D. It requires energy
Answer:
Option D, It requires energy
Explanation:
Active transport is a mechanism by which a substance move against the concentration gradient i.e from regions of low concentration to regions of high concentration. In order to do move against the gradient lot of energy is required which is pumped in by the energy molecule ATP produced during the cellular respiration.
While in other form of transportation i.e passive, a substance moves from the region of high concentration to the region of low concentration and hence no energy input is required.
Thus, option D is correct
During an experiment, which factors are observed and measured?
a. hypotheses
b. independent variables
c. dependent variables
d. constants
The dependent variables are factors that you want to observe or measure. The hypothesis is an explanation made on the basis of limited evidence as a starting point for further investigation. The constants are exactly what they sound like, it is stuff that does not change during the experiment. The independent variables is stuff that reacts to the dependent variables. This means the answer will be C.
What is the difference between gymnosperms and angiosperms?
Answer:
Gymnosperms: naked seeds, they usually have no flowers or fruits, and Gymnosperms are sometimes configured as cones.
Angiosperms: there seeds are enclosed inside an ovary usually a fruit, they have few cells unlike a Gymnosperm, and have no flagella deposited at egg.