Fossil evidence indicates that the first organisms on Earth were single-called prokaryotes. The first eukaryotes are believed to have formed from these prokaryotes. How does the endosymbiotic theory explain the development of the first eukaryotic organisms?.

Answers

Answer 1

The study of fossils shows that the eukaryotic cells have been evolved from the prokaryotic cells. The endosymbiotic theory has been used to study the evolution of eukaryotic cells.

The endosymbiotic theory states that:

Endosymbiotic theory is also referred to as the theory of symbiogenesis. The theory explains the evolution of eukaryotic cells from prokaryotic cells.

The theory explains the presence of chloroplasts and mitochondria, and how these organelles form the eukaryotic cells. The theory explains the origin of mitochondria in animal cells and chloroplasts in plant cells.

Thus, the endosymbiotic theory defines the development of eukaryotic cells from the prokaryotic cells.

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Related Questions

What important role does fire play in a grassland biome?

Answers

Fire naturally occurs in a grassland ecosystem and it helps the environment stay healthy and strong. I promotes richer soil as well as gets rid of excess leaves scattered around. After a fire, grassland ecosystems can grow again and be better than they were before.  

Answer: Fire is a natural part of the grassland ecosystem and helps maintain its health and vigor. It warms up the soil and reduces the leaf litter that accumulates each year, allowing sunlight to penetrate. ... After a fire, blackened fields quickly revive with new, green grasses and abundant, showy wildflowers. So, fire is important because it helps things grow better... sorry if i am incorrect...

hope this helps.. stay safe and have a great day!!! :D

in the bacterium e. coli, a repressor protein binds to the operator region of the dna in the absence of lactose, thuspreventing the transcription of the genes of the lactose operon. true false

Answers

In the bacterium e. coli, a repressor protein binds to the operator region of the DNA in the absence of lactose, thus preventing the transcription of the genes of the lactose operon. This statement is True.

What is E.coli?

E. coli is a kind of bacteria that resides in the intestines of both human beings and animals. Though many strains of E. coli bacteria are safe, others can induce sickness. E. coli O157:H7 is a significant E. coli strain that can cause serious illnesses in humans.

Lactose operon

The lactose operon, also known as the lac operon, is a group of genes responsible for the metabolism of lactose. The operon consists of three structural genes, an operator region, and a promoter. The genes in the lactose operon are not transcribed when there is no lactose present. The operator region of the lactose operon regulates the transcription of the structural genes of the lactose operon. The repressor protein binds to the operator region when lactose is not present, preventing the transcription of the genes in the lactose operon.

Operator region of DNA: In genetics, the operator region of DNA, also called the operator segment, is a segment of DNA that is positioned in or close to the promoter of a gene. It is a DNA segment that interacts with a regulatory protein, typically a repressor protein, to regulate the initiation of transcription of an adjacent gene.

Transcription: Transcription is a process by which a DNA sequence is utilized to produce a complementary RNA copy. This process is an essential part of gene expression, and it occurs in both eukaryotes and prokaryotes.

Absence of lactose: When lactose is not present, the repressor protein binds to the operator region of DNA, preventing transcription of the genes in the lactose operon.

Therefore, the given statement is true.

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The oceans make up 70% of Earth's surface. They regulate the overall temperature of the earth by absorbing a great deal of solar energy and heating up slowly. What is true about the oceans' release of heat?

A. The oceans release heat rapidly and add to the greenhouse effect.
B. The oceans release heat more slowly than the land.
C. The oceans release heat more rapidly than the land.
D. The oceans release heat at the same rate as the land.​

Answers

Love I think that the answer is B sorry I I was wrong

Explain why mice in urban areas can digest certain food better than rats in rural areas. Using the terms
"genes" and "allele frequency" in your explanation provide data of this phenomenon.

Answers

Finding the corresponding human illness genes using rat disease gene identification is helpful, but it also aids in understanding the mechanisms causing pathological defects.

What is the random alteration in allele frequencies caused by genetic drift?

Genetic drift is the term used to describe the haphazard changes in gene variant frequencies within a population. Genetic drift occurs when the frequency of different alleles, or variable forms of a gene, fluctuates over time through chance. Changes in allele frequencies are used to measure these differences in allele presence.

Who made genetic drift public?

In the future, Sewall Wright, a pioneer in population genetics, invented the phrase "genetic drift" and the corrected mathematical treatment.

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among molluscs, only members of the class have a circulatory system, in which all of the blood is contained in vessels to maintain higher blood pressure.

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Among mollusks, only members of the class have a circulatory system, in which all of the blood is contained in vessels to maintain higher blood pressure. Annelids.

The circulatory machine is made up of blood vessels that bring blood far away from and closer to the heart. Arteries bring blood far from the coronary heart and veins convey blood returned to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and eliminates waste merchandise, like carbon dioxide.

Arteries bring blood far away from the heart and veins convey blood returned to the coronary heart. The circulatory gadget includes oxygen, vitamins, and hormones to cells, and removes waste merchandise, like carbon dioxide.

Our coronary heart is the best circulatory machine organ. Blood is going from the coronary heart to the lungs to get oxygen. The lungs are a part of the breathing system. Your coronary heart then pumps oxygenated blood via arteries to the rest of the body.

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Observe: An organelle is a cell structure that performs a specific function. Observe the samples below under the highest magnification. Click the Show labels checkbox to label the organelles. List the organelles and approximate size of the cells in each sample.

Answers

buvtycrrtcvtvbhjhgfdeswdfgbnvcxzAwsertyujikl,mnbvcdertyu

TRUE / FALSE. All organic forms of life have a division of labor within them, metabolism (chemical activity) and replication (genetic code). DNA (Deoxyribonucleic acid) is the key to the genetic code in most organisms living today and serves as an instruction manual that makes it possible to create a living organism. However, DNA is helpless without its counterpart, metabolism. The discovery of RNA (Ribonucleic acid) in the 1960s did not help help alleviate this problem. RNA is a relative of DNA but it can only perform metabolism and not replication in an organism. This has led some scientists to conclude that RNA is not useful for understanding the origins of life.

Answers

After considering the given data and reviewing the valid articles and information  concerning DNA we conclude that the statement is true.

All organic forms of life possess a division of labor within them, metabolism (chemical activity), and replication (genetic code). DNA is the key to the genetic code in most organisms living today and serves as an instruction manual that makes it possible to create a living organism.
Therefore , DNA is helpless without its counterpart, metabolism. Metabolism is the set of chemical reactions that occur in living organisms to maintain life. The discovery of RNA in the 1960s did not help alleviate this problem.

RNA is a relative of DNA but can only perform metabolism and not replication in an organism. This has led some scientists to conclude that RNA is not useful for understanding the origins of life.
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Solubility v Temperature
20
40
80
100
120
60
Temperature (°C)
2015 FlipSwitch
According to the graph, what is the correlation between temperature and solubility?
O no correlation
O neutral
O positive
Type here to search
Solubility (grams)
60
8898220
50
negative
O At
i

Solubility v Temperature20408010012060Temperature (C)2015 FlipSwitchAccording to the graph, what is the

Answers

According to the Graph, the correlation between temperature and solubility is positive. Thus, the correct option is C.

What is Solubility?

Solubility may be defined as a property of a substance i.e. solute that is easily dissolved in another substance known as a solvent.

The solubility of any substance is directly proportional to the temperature to some extent, but after a threshold solubility does not increase with an increase in temperature.

Therefore, the correct option for this question is C.

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The graph shows a positive link between temperature and solubility. Thus, the correct option is C.

What is Solubility?

The maximum amount of a solute that may dissolve in a given amount of solvent or solution at a given temperature or pressure is known as its solubility.

Any substance's solubility is somewhat directly related to temperature, but above a certain point, solubility does not increase with temperature.

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What percentage of men experience nocturnal orgasms?

Answers

Nocturnal orgasms, also known as "wet dreams," are involuntary ejaculations that occur during sleep, usually during periods of rapid eye movement (REM) sleep. These types of orgasms can occur in both men and women, but they are more common in men.

The prevalence of nocturnal orgasms in men varies depending on age and other factors. According to a study published in the Journal of Adolescent Health, the percentage of men who reported experiencing nocturnal orgasms at least once in their lifetime was:

83% of men aged 17-1974% of men aged 20-2460% of men aged 25-2944% of men aged 30-3922% of men aged 40-49

It's important to note that not all men experience nocturnal orgasms, and the frequency and intensity of these types of orgasms can vary greatly from person to person. Additionally, nocturnal orgasms are a normal and natural part of sexual development and do not necessarily indicate any underlying medical or psychological issues.

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Which of the following processes takes place during prophase?
A. Nuclear membranes form two sets of chromosomes
B. Chromosomes are copied
C. Spindle fibers pull the sister chromatids apart
D. Mitotic spindles form

Answers

Answer:

It would be D. Mitotic spindles form

Which of the following processes takes place during prophase?A. Nuclear membranes form two sets of chromosomes

2) Micah and Taylor investigate the effect of tap water and spring water on the growth of plants.

They grew two plants of the same type and size in separate containers. Every three days, they

added the same amount of tap water to one plant and the same amount of spring water to the

other. Describe an action that would best improve the reliability of their results?

Answers

Answer:

To improve the reliability of the results, the nutritional component of each category of water must be tested and recorded.

Second, the experiment should be carried out under greenhouse conditions.

The above actions will afford more control. When an experiment is controlled, it means that except for the dependent variable, all other variables are kept constant by the scientist.

By performing the experiment under greenhouse conditions, the kind of water the plants receive, temperature and other biotic actors are kept within measurable limits thus increasing the reliability of the results.

Cheers!

brush up on what you learned about eukaryotes this week! one could easily use the evolutionary tree labeled below to make a dichotomy key to separate the three main eukaryotic kingdoms of plantae, fungi, and animalia. however, the protista kingdom is a more difficult group to add to a simple key as there are many exceptions (see the right side of the tree).

Answers

A: presence of cell walls B: Ability to obtain nutrients through absorption C: presence of chitin in cell walls D: ability to move

Character A, which separates plants from fungi and animals, is the presence of cell walls. Plants have cell walls composed of cellulose, while fungi and animals do not have cell walls. Character B, Fungi and animals are heterotrophs that obtain nutrients by absorbing organic material from their environment, while plants are autotrophs that can perform photosynthesis.

Character C, that fungi have, but animals don't, is the presence of chitin in their cell walls. Fungi have cell walls made of chitin, while animals do not possess cell walls. Character D, that animals have, but fungi don't, is the ability to move. Animals are generally capable of locomotion, while fungi are non-motile organisms that rely on other means, such as growth and spore dispersal.

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The question is inappropriate; the correct question is:

Eukaryotes Brush up on what you learned about eukaryotes this week! One could easily use the evolutionary tree labeled below to make a dichotomous key to separate the three main eukaryotic kingdoms of Plantae, Fungi, and Animalia. However, the Protista kingdom is a more difficult group to add to a simple key as there are many exceptions (see the right side of the tree). Using the tree above, answer each question below with the correct matching answer. Use each answer only once. 1. What is character A, which separates plants from fungi and animals? 2. What is character B, that both fungi and animals share, but plants don't have? 3. What is Character C, that fungi have, but animals don't? 4. What is character D, that animals have, but fungi don't?

Eukaryotes:

AnimaliaFungiPlantaeProtista

Neurons are activated by which of the following?
a. by neurotransmitters
b. by impulses
c. by vision
d. by sensory

Answers

Answer:

A

Explanation:

Answer:

a. by neurotransmitters

Explanation:

Solve for the percentage of Feed B to be used in the ration?

Solve for the percentage of Feed B to be used in the ration?

Answers

Answer:

b

Explanation:

i used the formula to eliminate c, a, and d

a group of organisms that can interbreed and produce fertile offspring is called

Answers

Answer:

Species.

Explanation:

A species is often defined as a group of organisms that can reproduce naturally with one another and create fertile offspring.

Mark as BRAINLIEST please, will follow.

When light passes through an object

When light passes through an object

Answers

Answer:

Transmitted

Explanation:

The answer is Transmitted

What is 14.48 to the nearest 0.1

Answers

the answer would be 14.50

Answer:

14.50

Explanation:

if your trying to find the nearest 0.1 and the number is 14.48 you need to round it by the number next to it and that is 14.48, if the number is greater than 5 you round up, and 8 is greater than 5. Meaning you round 4 up meaning its 5. Making the total number, 14.50.

What cell organelle contains enzymes and acts as the digestive system of the cell.

Answers

Lysosome is the cell organelle that consists of the hydrolytic enzymes and acts as cell's digestive system.

Lysosome is the single membranous cell organelle. If any pathogen infects the cell, lysosome digests the portions or the entire cells by its enzymes. Apart from this lysosome also deals with digesting the waste material and food materials of the cell.

Hydrolytic enzymes are those that are capable of breaking down the large biomolecules of the cell like carbohydrates, proteins, lipids, etc. These enzymes are also called hydrolases. They require acidic environment to work in and hence are present in the lysosome. There are around 40 hydrolytic enzymes in the lysosome.

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what is the niche definition of biology?

Answers

In biology, a niche refers to the role or position that a species occupies within an ecosystem, including its interactions with both the biotic and abiotic components of the environment. More specifically, a niche is defined as the sum total of a species' use of the biotic and abiotic resources in its environment, and how it contributes to the ecosystem as a whole.

A species' niche includes its physical and biological requirements for survival, such as the type of food it eats, the temperature and moisture levels it can tolerate, the amount of sunlight it needs, and the presence or absence of other species in its environment. Additionally, a species' niche also includes its interactions with other species in its ecosystem, including its predators, competitors, and symbiotic partners.

The concept of a niche is important in understanding how different species coexist in an ecosystem and how they contribute to the overall functioning of the ecosystem. By occupying different niches, species can reduce competition for resources and increase the overall biodiversity of an ecosystem.

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Use categories that parallel the taxa of q biological classification system to organize the items you can borrow from the library

Answers

Classification of biological organisms from most general to most specific is -

DomainKingdomPhylumClassOrderFamilyGenusSpecies

What is hierarchy system?

A hierarchy system of taxa or ranks of living organisms up to species level is known as taxonomic classification. It includes a higher and most generalized rank domain consist of archaea, bacteria, and eukarya. Second most generalized ranks kingdom that consist of various kingdoms.

Less generalized ranks are in order of a decrease in general and an increase in specificity are phylum, class, order, and family and the most specific ranks are genus and species.

Therefore, Classification of biological organisms from most general to most specific is -

DomainKingdomPhylumClassOrderFamilyGenusSpecies

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Carrots that have been cut into pieces have a shorter
shelf life than whole carrots. Explain this observation
using factors that affect rate of reaction.

Science 10

Answers

When you cut up the carrot you increase the surface area of the carrot substantially. This increased surface area reacts with the atmosphere and makes the carrot (collectively the pieces) more exposed to bacteria and as a result the cut up carrots will go bad before the carrots as a whole.

‼️URGENT‼️
I really need help with this one problem ​

URGENTI really need help with this one problem

Answers

Answer:

C.

Explanation:

A. This makes no sense because the chart is only about the number of fish not about the number of plants that have grown

B. Makes no sense???

C. This is correct because it provides a reason why the number of fish in the stream next to the orchard have decreased

D. Makes no sense as well

The correct answer is going to be C

Two sets of plants were grown in two containers. The first container has plants with the genotype ANL/ANL, ygr/ygr. The second container has plants with the genotype anl/anl, YGR/YGR. If the plants in the left container are pollinated by the plants in the right container, what will be the phenotype of the offspring plants?Fast Plants 1 AQ4 A. Purple stem, green leaves B. Purple stem, yellow leaves C. Green stem, green leaves D. Green stem, yellow leaves

Answers

I don’t know sorry I’m taking snap test and really need an answer.

You want to study divergence of populations, and you need to maximize the rate of divergence to see results within the period of your grant funding. You will form a new population by taking some individuals from a source population and isolating them so the two populations cannot interbreed. What combination of characteristics would maximize your chance of seeing divergence in this study? 1. Choose a random sample of individuals to form the new population. 2. Choose individuals from one extreme to form the new population. 3. Choose a species to study that produces many offspring. 4. Choose a species to study that produces a few, large offspring. 5. Place the new population in the same type of environment as the source population. 6. Place the new population in a novel environment compared to that of the source population. (A) 1,3 , and 6 (B) 1,4 , and 6 (C) 2,3 , and 5 (D) 2,3 , and 6

Answers

So option D(2,3, and 6) is the correct answer.

What is Divergent populations?

Divergent populations is the process by which two or more populations of an ancestral species accumulate independent genetic changes (mutations) over time, often resulting in populations being reproductively isolated for some time. resulting in reproductive isolation and continued mutation even after It is no longer genetic exchange. In some cases, subpopulations living in ecologically distinct surroundings can show genetic differences from the rest of the population, especially if the population range  is very large (see Parapatric speciation ). Genetic differences between different populations can involve silent mutations (that do not affect phenotype) or result in significant morphological and/or physiological changes. Genetic divergence, always accompanied by de novo adaptations by selection and/or reproductive isolation by genetic drift,  is the main mechanism underlying speciation.

Divergence population, as used in evolutionary biology, refers to the process by which a population of an inbreeding species splits into two or more descendent species that have increasingly different forms and structural characteristics. Their alterations as a result of environmental adaption.

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true or false? to make a person breathe in, the volume of the chest cavity must decrease, creating a higher pressure in the thorax

Answers

The thorax is a very vital and important organ in the human body.

It is a structure that serves as a protective covering for organs in the body such as the lungs, the heart, some vital blood vessels e.t.c

It is false that to make a person breathe in, the volume of the chest cavity must decrease, creating a higher pressure in the thorax.

When a person breathes in,  the chest cavity expands (the volume increases) and the pressure in the thorax decreases.

When a person breathes out, the chest cavity decreases in size, and the pressure in the thorax increases.

Therefore, we can see that the process of breathing in humans, follows the principle of Boyle's Law.

Boyle's law states that as the volume increases there is a decrease in pressure and as the volume decrease there is an increase in pressure.

Therefore, It is false that to make a person breathe in, the volume of the chest cavity must decrease, creating a higher pressure in the thorax.

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the soma of psuedounipolar neurons is found in the gray matter of the spinal cord. T/F

Answers

It is true that the gray matter of the spinal cord contains the soma of pseudounipolar neurons.

Where in the spinal cord can you find pseudounipolar neurons?

A dorsal root ganglion houses a pseudounipolar neuron's cell body. After exiting the cell body and the ganglion of the dorsal root, the axon enters the dorsal root and divides into two branches. The central branch reaches the spinal cord's dorsal columns, where it joins with other neurons to form synapses.

Where are neurons' soma found?

Image result The soma—also known as the tree trunk—is where the nucleus of the neuron is located, where the neuron's DNA is kept, and where proteins are made so that they can travel along the axon and dendrites. In both the brain and the spinal cord, there are various types of neurons.

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Describe at least 3 drawbacks from more humans living in cites. (How is it hurting the environment)​

Answers

1) More humans = more vehicles = more smoke and other air pollutants. So, causes air pollution.

2) More humans in cities = less humans in villages = less farming produced. So, fewer food items.

3) Over-population in cities can also disrupt the known balance.

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what is a weakness or limitation for using orbeez as a model for a cell?​

Answers

Answer:

You cant make the organells that detailled or make them at all for that matter?

Explanation:

Focus Question: Which tissue sample is
the best for absorption and why?

please help me this is one of my missing assignments

Focus Question: Which tissue sample isthe best for absorption and why?please help me this is one of my

Answers

Answer:

Epitheial tissue

Explanation:

When forest land is cleared for human use, the loss of trees can lead to other changes to Earth's surface. Which of the
following processes is most likely to occur after land has been cleared of its trees?

Answers

Answer:

Global warming

Increase in sea level

Depletion of ozone layer

spread of disease

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