Look at the overall view of the onion root tip. Which phase does it look like most cells are in? Why are most cells in this phase?
Answers
Hello. You did not present the image to which this question refers, which makes it impossible for this question to be answered. However, I will try to help you in the best possible way.
I believe you are looking at cells from the tip of the root, in an experiment where the tip of the root of the onion was cut. To redo the tip of the root, the onion cells will undergo mitosis, which is the cell division where a cell originates from two identical cells.
Mitosis has five phases and all of them can be seen in the onion root cells according to the following characteristics:
1. Interphase: it is the moment when the cells increase in size and intensify their metabolic activity. The cells of the onion root will be in this phase when they appear as a completely dark and filled circle.
2. Prophase: The chromosomes condense and become visible and the cell membrane is flawed. In the cells of the onion root, you will be able to see this phase in cells that appear as an irregular circle, with a tangle of lines scattered inside.
3. Metaphase: The chromosomes condense further and connect to the spindle lines that are in the center of the cell. In the onion root cells, you will identify this phase in circles with a tangle of lines that are concentrated in the center of the cells.
4. Anaphase: The centromeres are separated and the sister chromatids migrate to the poles of the cell. You will be able to see this phase in cells that have a concentration of lines at both ends of the cell.
5. Telophase: the chromosomes are decondensed and the cell membrane is formed again while the cell separates into two. You will see this phase with the presentation of two cells.
To improve your understanding, the attached figure below shows how the cell appears in each phase.
Related Questions
Earth's average temperature typically fluctuates (cycles)
O True
O False
Answers
When gases trap heat in the atmosphere causing the temperature to rise this is called the greenhouse effect.
A. True
B. False
Answers
Answer:
A. True
Explanation:
Gases trap the heat in the atmosphere causing the temperature to rise, this is called the greenhouse effect.
Why does the mitochondrial gene tree suggest a later split? Why the disparity between the nuclear gene tree?
this is the link: https://learn.genetics.utah.edu/content/evolution/bears/
Answers
Answer:
Why does the mitochondrial gene tree suggest a later split?The mitochondrial gene tree suggests a later split because it occurred hybridization later in time, with the transference of the brown bear mitochondrial genetic information to the polar bear population. So the mitochondrial gene tree exhibits a later divergence.
Why the disparity between the nuclear gene tree?Because the first divergence event of the common ancestor occurred 60,000 years ago, evidenced by nuclear DNI and mitochondrial DNI. However, 100,000 years ago, concerning the mitochondrial genetic material, the hybridization event defined a new more recent common ancestor between the two species.
Explanation:
The use of mitochondrial DNA might present a few problems that need to be considered in evolution studies. It involves only one locus, so it has some limitations when reconstructing history, especially if the locus went through any process, such as natural selection, bottleneck events, or its transference to another population due to hybridization. There is also a high possibility of an incomplete reconstruction of the population history if males and females have different dispersal patterns.
The most proper way of reconstructing history is by complementing mitochondrial information with nuclear genetic information and evaluating their concordancies.
In the exposed example, 600,000 years ago, the original species split into the polar bear and the brown bear. But 100,000 years ago, hybridization occurred between a brown bear female and a polar bear male. The offspring joined the polar bear population, carrying the female genetic information, nuclear and mitochondrial. With time, these individuals interbred with the polar bears, diluting the nuclear brown bear genetic information. However, females carrying the brown bear mitochondrial DNI seemed to be more successful reproductively than the polar bear females. The mitochondrial information, hence, has been in the population for many generations, until today. And this information came from a more recent common ancestor, compared with nuclear genetic information.
Which of the following is the best example of a population?
Answers
Answer:
B) A school of sunfish.
In biology, a population is a number of all the organisms of the same group or species who live in a particular geographical area and are capable of interbreeding
Answer:B
Explanation: JUST TOOK THE TEST TRUST ME!
Two species of three-spined stickleback fish have been found together in five different lakes. The larger, bottom-dwelling species feeds on large prey close to shore. A surface-dwelling species feeds on small plankton in open water. DNA analysis shows that the two species in each lake are more closely related to each other than they are to any of the other species in the lake. Which prezygotic mechanism most likely allowed divergence of an ancestral species into these present-day species
Answers
Answer:
The answer is "Sympatric speciation due to disruptive selection"
Explanation:
Disruptive selection is a certain type of natural choice, that aggressively favors all ends of the spectrum in a moderate community. Disruptive selection is often deduced by a phyletic prepared to change to contribute to speciation. These two species happened due to various habitats associated with extreme speciation due to various confusing choices.
Which conclusion can you draw from the information shown in the graph?
A. Carbon dioxide levels are currently much lower than normal.
B. Carbon dioxide levels are currently higher than they have ever
been.
C. Carbon dioxide levels in the past have been as high as they are
now.
D. Carbon dioxide levels are always about the same.
Answers
Answer:
The answer is B. Here is proof. Plz mark brainliest
Explanation:
What is human fetal development? I need simple definition
Answers
Answer:
Fetal development is when many of it's organs become fully developed.
Blowing into a flute can produce a sound because_______.
A. light energy is transformed into sound energy
B. the flute warms the air
C. air expands in the flute
D. air in the flute vibrates
Answers
Answer:
D
Explanation:
When you blow in a flute the holes cause vibrations which make sound which make music.
What is the difference between a guard cell and a white blood cell?
Answers
Blood cells can guard body btw.
Guard cells are found in plants and white blood cells are found in animals.
What are guard cells?Guard cells are specialised plant cells that regulate gas exchange in the epidermis of leaves, stems, and other organs. They are created in pairs, with a stomatal orifice separating them. What are white blood cells?The immune system's white blood cells, also known as leukocytes or leucocytes, are responsible for defending the body against both infectious diseases and foreign invaders. All white blood cells are created and developed from hematopoietic stem cells, which are multipotent cells found in the bone marrow. All parts of the body, including the blood and lymphatic system, include leukocytes.Guard cells function to allow gaseous exchange and white blood cells are responsible for the functioning of the immune system.
Learn more about guard cells here:
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Lancelets are the only extant group of cephalochordates. True or False
Answers
Answer:
True
Explanation:
This is because Cephalochordates are the recent ancestor of lancelets. They have muscle segmented Brook.The lancelets are mostly marine organisms that live in shallow, tropical and temperate oceans. The lack a well differentiated head region but they have brain region.
Read the following summary, which describes blood flow and heart output in space. Then, answer the question.
The heart doesn't have to do as much work to pump blood when in orbit. After only one day beyond Earth's gravity, astronauts have a lower blood volume. They can lose as much as 20 percent of their blood volume while on a space mission. Since the body has less blood to push around and the heart is pushing more blood with each beat, an astronaut's heart rate also slows down to compensate.
What process is being described?
Breathing
Excretion
Homeostasis
Respiration
Answers
Explanation:
respiration because it's about blood circulation
Answer:
its respiration
Explanation:
im doing the same test
How did Francesco Redi disprove the idea of spontaneous generation?
He showed that flies were not produced by meat.
He showed that microorganisms are present in air.
He showed that microorganisms cause disease.
He showed that flies spread disease.
Answers
Francesco Redi showed that microorganisms are present in air thereby disproving the idea of spontaneous generation and is denoted as option B.
What is Spontaneous generation?This is supposed production of living organisms from non living substances.
The jar was left open and had maggots in it means the flies laid their eggs which later turned to the maggot which was what Redi observed during the experiment.
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A gene has 2 alleles, R & B, List the possible genotypes? I also need help with questions 5, 6, 7 and 8 please help! Pls look at the picture! I will mark whoever sounds best the brain! Ty!
Answers
Answer:
5.) The possible genotypes should be: RR RB BB ( if the could for the same proteins)
6.) Frequency of R: 0.5
7.)Frequency of R: 0.5
8.)Frequency of R: 0.375
Explanation:
5.) If R and B code for the different forms of the same protein then they are only a few possible out comes
6.) First calculate the total alleles in population
allele R= 40
Allele B=40
total allele = R+B= 40+40
=80
Now to find allele R frequency is:
(Total R alleles) / (Total allele in pop)
40/80=
0.5
7.)Calculate the total alleles
Alleles from for R
RR= 10
R=10x 2= 20
Multiply the value by 2 because there are 2 R alleles present in
RB=20
R=20
Number doesn't change there is only 1 R allele
Total R=20+20
=40
Alleles For B
BB=10
B=10×2
=20
Same thing here, two B alleles together so multiple by 2
RB=20
B=20
Total B= 20+20
=40
Total alleles in pop add
40+40
=80
Frequency of R
Total of R/Total Alleles
=40/80
=0.5
8.)Repeat the same thing in 7 but use different numbers
RR=10
R=10x2
=20
RB=10
R=10
Total R= 20+10
=30
Your cells have a unique MHC (major histocompatibility complex). Directions for producing MHCs come from _________________.
A. the helper T-cells
B. the thymus
C. inherited DNA
D. the bone marrow
Answers
The directions for generating MHC comes from the option c. inherited DNA. hence, the option c is correct.
What is MHC?The full form is a major histocompatibility complex. It is the genes group that have the proteins code that should be founded on the cell surface which helped the immune system, that recorded in the foreign substance.
So at the time of directing, it produced MHC that came from inherited DNA.
hence, the option c is correct.
learn more about DNA here: https://brainly.com/question/19739527
how are bacterias different from animals ?
Answers
Answer:
Bacteria are neither animals nor plants.... Because bacteria are prokaryotic, they do not have a nucleus and no membrane-bound organelles. In contrast, plants and animals are made up of eukaryotic cells, which means they have a nucleus and membrane-bound organelles like mitochondria or golgi apparatus.
Explanation:
Answer:
Bacterias have simple cells and are typically single cell organisms where as animals which have more complex cells are are multi celled organisms UwU
HOPE THIS HELPS
-Todo <3
Explanation:
Which statement best describes evolution in a population? A. It is a change in how common a certain genetic trait of a species is from one generation to the next. B. It is a gene for a trait that helps an individual reproduce more times during its life C. It is a trait that helps an organism survive longer and produce more offspring D. It is a process by which an individual with a helpful trait produces many offspring with the same trait.
Answers
Answer:
A
Explanation: Because that means that humans reproduct another human as it keeps going on and some people call the people from our past is ancester but it moveing on to a new genaration of kids and then when they grow up the they make more kids that why it is A
Answer:a
Explanation:
What is the purpose of nitrogen-fixing bacteria?
Answers
Answer: The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate formation of root nodules, enlargements of plant cells and bacteria in intimate association. Within the nodules the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development. brainliest?
Explanation:
Answer:
Within the nodules the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
Explanation:
Urgent!!
Which of the following is a major goal of fisheries managers?
A.Using resources intelligently so they will be preserved.
B.Increasing fish production as much as possible.
C.Reducing public consumption of fish to protect fish populations.
D.Preserving natural resources in a pristine and unused state.
Answers
PLEASE HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! T-T
I KNOW IT LOOKS HARD BUT IT RLY ISNT
Answers
Answer:Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP).
Explanation:
13. What type of chemical hazard is a person ingesting if they eat a lot of processed foods, cured
meats, and certain types of wines?
Answers
Answer:
The correct answer is - health hazards (carcinogenic).
Explanation:
Processed foods, cured meat, and certain types of wines have a chemical present in them for increasing the life of the food and taste. This chemical is used in this food are known for their cancer-causing properties and grouped as group 1 carcinogen which comes under health hazard of type of chemical hazard.
N-nitroso-compounds (NOC) and polycyclic aromatic hydrocarbons (PAH) are the two major chemicals used in cured meat and processed food. There are many other severe health conditions also caused by ingesting a high amount of such food like diabetes, cardiovascular disease, and obesity.
Which of the following is the best definition of alternative energy?
A. Energy sources that can be used in place of hydroelectric energy
B. Energy sources that can be used in place of wind energy
C. Energy sources that can be used in place of coal
D. Energy sources that can be used in place of fossil fuels
Answers
Answer:
D
Explanation:
Alternative energy is best defined as the use of energy sources other than traditional fossil fuels, which are considered environmentally harmful and are in short supply. Fossil fuels consist of natural gas, coal, and oil. Currently, fossil fuels are the most used energy source to heat our homes and power our cars.
Answer:
D.)
Explanation:
Alternative energy is best defined as the use of energy sources other than traditional fossil fuels, which are considered environmental harmful and are in short supply.
What type of tissue do pollutants collect in?
No links
Answers
Answer:
one type of tissue is animal tissue
Explanation:
brainliest pls
Which of the following conditions is least likely to have an effect on natural selection in a species of sheep that are geographically isolated on an island?
A. available niches
B. existing predators
C. chromosome number
D. available food resources
Answers
Answer:
A. available niches
Hope it helps!
Answer:
C.
Chromosome number
Explanation:
In a human karyotype, the 46 chromosomes of the human genome are arranged into 23 pairs. Encyclopædia Britannica, Inc. An organism with any multiple diploid numbers of chromosomes is said to be polyploid.
Which of these is responsible for the ""rough"" appearance of endoplasmic reticulum? DNA Enzymes lysosomes Ribosomes
Answers
Answer:
Ribosomes
Explanation:
State TWO reasons how bacteria can be useful to humans,
Answers
Answer: Creating products, such as ethanol and enzymes.
Making drugs, such as antibiotics and vaccines.
Making biogas, such as methane.
Cleaning up oil spills and toxic wastes. Bacteria have long been used by humans to create food products such as cheese, yoghurt, pickles, soy sauce and vinegar. We are also able to use bacteria to break down our sewage and to clean up oil spills.
Explanation:
Answer:
They help to digest substances that the human body cannot break down, like many carbohydrates and things called short chain fatty acids. Friendly bacteria give you protection from the microorganisms that could cause serious illness.
Explanation:
Urgent!! Will give brainlist to best answer!!
The top ten most commonly eaten foods mostly include grains and other starchy plants.
True
False
Answers
Answer:
true
Explanation:
Carbohydrates can be divided into three main categories: sugar, fiber and starch.
Starches are the most commonly consumed type of carb, and an important source of energy for many people. Cereal grains and root vegetables are common sources.
What is the waste product of the Krebs cycle and how many molecules are released?
Answers
Answer:
13 molecules are released
Predict what would happen if a person had too few target cell receptors on the thyroid gland? (100 points)
Answers
Answer:
They wouldn’t be able to see properly
Explanation:
Chandra X-ray observatory has reported that they have found a new star near our solar system. The Chandra X-ray telescope detects x-rays in space. What does the use of the x-ray telescope review about the newly found star? ( PLS EXPLAIN Y THE ANSWER IS CORRECT)
a. The star produces electromagnetic waves with shorter wavelengths than visible light.
b. The star produces electromagnetic waves with lower frequencies than visible light.
c. The star produces pictures in addition to electromagnetic waves.
d. The star produces vibrating electrons
Answers
Answer:
It’s possibly b, or a but I am definitelyonly 49% sure
Explanation:
Hope this helped you Arianna!
Please anyone help please please help ASAP ASAP please
Answers
Answer:
radiant to electrical
Explanation: