Vitamin A is regarded as the antioxidant that plays an important role in cell
differentiation.
Cell differentiation is the process by which cells become specialized by
changing from one form to another to achieve a common structure and
function.
Vitamin A has a strong metabolite known as retinoic acid which is involved
in this process which supports it and also helps to eliminate the free radicals
which may be present.
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the genes stc1 and stc2, which share a common ancestor, are found in both zebrafish and humans. all four stc genes display similar patterns of exon and intron sequences. based on these facts, what is the most likely explanation for the origin of stc genes?
Based on these facts, we can state that the genes of the two organisms had a eukaryotic origin.
We can arrive at this answer because:
Despite having exons, prokaryotes do not have introns in their genomes.This means that if two organisms have the same sequence of introns and exons, they have a common ancestor, in addition to having their genes originated in a eukaryotic organism, which explains the sequence of introns.This means that the genetic expression of these two organisms has similarities, even if they are organisms with different biological processes.
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100!!! POINTS!!!!
On the map, take a close look at the boundary along southern California and Mexico’s Baja California Peninsula. The arrows on the map show the direction and speed of the plates along this boundary in millimeters per year. Based on the speed and direction of the arrows, identify the type of plate boundary at this location. Which landforms or events are likely to occur there as a result? (Hint: It may be helpful to model the motion of the plates using your hands or pieces of paper.)
Explanation:
Thus, at convertgent boundries, continental crust is created and oceanic crust is destroyed. Two plates sliding past each other forms a transform plate boundry
The area around the convergent boundries, continental crust is created then the oceanic crusts were destroyed.
What are land forms?The term land form is used to describe the physical features that describe the geography of any particular area.
Looking at the map, in the area around the convergent boundries, continental crust is created then the oceanic crusts were destroyed.
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Which of the following sentences state a significant conclusion that Gregor Mendel drew from his experiments with pea plants? Traits are inherited in discrete units and are not the result of "blending." Genes are composed of DNA. Recessive genes occur more frequently in the F1 generation than do dominant ones. There is considerable genetic variation in garden peas.
Mendel concluded that the alternative forms of each trait are coded by discrete factors, which were called alleles that combine in pairs to express the trait. Traits are inherited in discrete units and are not the result of "blending."
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After making many crosses that involved different traits -such as plant height, or flower colors-, Mendel observed that, per trait, the F1 only expressed one of the alternative forms, while de other one disappeared.
Mendel named dominant the expressed variant.
Mendel then let these new plants auto pollinate and observed the results in the second generation, F2.
He saw that the variants that had previously disappeared among the F1, reappeared again. Both alternatives for each trait were present in the F2.
Mendel named recessive the second alternative variant.
Mendel explained his results by arguing that discrete factors were responsible for these phenotypes.
These factors should have been present in the F1 in pairs. One of them came from one parental plant, and the other factor came from the other plant. These factors separated again during sex cells formation, producing two types of gametes, each with only one factor.Mendel conclusion about his experiments was that per trait -flower color of plant length-, each plant had a pair of factors -which he named alleles-, and that each factor coded for one of the alternative forms of the traits -white or purple, tall or short-.
He thought that alleles separate -segregate- during the process of gamete formation.
The First Mendel's Law is the first conclusion he took about his experiments and is known as the segregation principle.
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what is called renewable energy and nonrenewable energy
Answer:
Resources are characterized as renewable or nonrenewable; a renewable resource can replenish itself at the rate it is used, while a nonrenewable resource has a limited supply.
Explanation:
Renewable resources include timber, wind, and solar while nonrenewable resources include coal and natural gas.
Answer:
The type of energy which can be used again and again is called renewable energy.
The energy which cannot be used again and again is called non renewable energy.
Why is the muscular system needed for respiration to occur in the human body?
Answer:
Explanation:
the muscular system is needed for respiration to occur in the human body because the diaphragm is a muscle iteslf and the diaphragm inflates the lungs
the ________ includes the thalamus, hypothalamus, and epithalamus.
Answer:
the skin includes the dermis, epidermis and hypodermis
Explanation:
it's the layer of skin
transcription begins at a promoter. what is a promoter?
Answer:
A site in DNA that recruits the RNA Polymerase
Explanation:
Why do the alveoli fill with fluid.
Answer:
Your lungs contain many small, elastic air sacs called alveoli. With each breath, these air sacs take in oxygen and release carbon dioxide. Normally, this exchange of gases occurs without problems. But sometimes, the alveoli fill with fluid instead of air, preventing oxygen from being absorbed into your bloodstream.
Explanation:
Answer:
The fluid represents the outermost layer of the alveolar surface that is directly exposed to air and thus to the environment. Alveolar fluid prevents desiccation of the epithelial cells and also functions as a physical protection barrier against inhaled particles and irritants. Explanation: hope this helps
Can you please help me with this?
How is the gametophyte stage in gymnosperms different from the gametophyte stage of mosses
Will give brain list
What is the main function of cellulose in plants? Cant pick between B and C
I'm working on an assignment and they all seem true to me. Help?
Which of the following statements about plants is not true?
a. They make their food from carbon dioxide and water through photosynthesis.
b. Land plants have cell walls that help hold their stems upright.
c. They have adaptations that help prevent water loss.
d. Plants absorb food through their roots.
Answer:
A
Explanation:
because plants use atmospheric carbon dioxide and water absorbed from the earth to create organic matter in the process of photosynthesis. On that occasion, oxygen is released.
Answer:
A
Explanation:
I hope this is correct, since every other version I've seen of this question option A is water and oxygen.
Which of the following is a developmental issue that occurs when an infant's vertebral column does not close all the way?
Answer:
d. Spina bifida
Explanation: is correct
What are the 6 kingdoms of life? Provide an example for each.
Answer:
Archaebacteria
Archaebacteria are the most recent addition to the kingdoms of organisms. Their existence was not discovered until the 1980s. However, Archaebacteria are the oldest known living organisms. They are single-celled and thrive in extremely hot boiling water found in environments like volcanic thermal vents in the ocean and hot springs like the geysers at Yellowstone Park. Some species also live in very salty environments such as The Dead Sea and The Great Salt Lake.
Eubacteria
Eubacteria are also single-celled bacterial organisms. This kingdom makes up most of the bacteria in the world. Eubacteria are very common and well-known to us as parasites like Streptococci which causes strep throat. However, these bacteria also help produce many antibiotics, vitamins and yogurt.
Fungi
The Fungi kingdom is recognizable to us as mushrooms, molds, mildews and yeasts. Unlike the organisms in the Archaebacteria and Eubacteria kingdoms, Fungi are multi-celled organisms. Early scientists classified mushrooms and other fungi in the Plant kingdom but they do not produce their own food as plants do.
Protista
Protista or Protozoa are single-celled organisms, but are more complex than single-celled bacteria. The Protista kingdom includes algae and slime molds. Any microscopic organism that does not fall into the bacterial, fungi, plant or animal kingdoms is considered a part of the Protista kingdom.
Plants
The Plant or Plantae kingdom encompasses all flowering plants, mosses and ferns. Plants are multi-celled, complex organisms and are considered Autotrophic. This means that plants create their own food through photosynthesis. The Plant kingdom is thought to be the second largest with over 25,000 known species.
Animals
The largest kingdom of organisms is the Animal or Animalia kingdom. This kingdom is made up of complex, multi-celled organisms ranging from sea sponge colonies to elephants. All organisms in the Animal kingdom are Heterotrophs meaning, unlike plants which produce their own food, animals feed upon other organisms. The Animal kingdom is the world's largest with over one million known species.
Based on this diagram label the positive and negative sides of the DNA fingerprint with a + and – sign.
Answer:
?
Explanation:
What is a DNA fingerprint?
DNA fingerprinting is a method used to identify an individual from a sample of DNA by looking at unique patterns in their DNA.
Background
Almost every cell? in our body contains our DNA?.
On average, about 99.9 per cent of the DNA between two humans is the same.
The remaining percentage is what makes us unique (unless you are an identical twin!).
Although this might sound like a small amount, it means that there are around three million base pairs? that are different between two people. These differences can be compared and used to help distinguish you from someone else.
Minisatellites are short sequences (10-60 base pairs long) of repetitive DNA that show greater variation? from one person to the next than other parts of the genome?. This variation is exhibited in the number of repeated units or ‘stutters’ in the minisatellite sequence.
The first minisatellite was discovered in 1980.
DNA fingerprinting
DNA fingerprinting was invented in 1984 by Professor Sir Alec Jeffreys after he realised you could detect variations in human DNA, in the form of these minisatellites.
DNA fingerprinting is a technique that simultaneously detects lots of minisatellites in the genome to produce a pattern unique to an individual. This is a DNA fingerprint.
The probability of having two people with the same DNA fingerprint that are not identical twins is very small.
Just like your actual fingerprint, your DNA fingerprint is something you are born with, it is unique to you.
How was the first DNA fingerprint produced?
The first step of DNA fingerprinting was to extract DNA from a sample of human material, usually blood.
Molecular ‘scissors’, called restriction enzymes?, were used to cut the DNA. This resulted in thousands of pieces of DNA with a variety of different lengths.
These pieces of DNA were then separated according to size by a process called gel electrophoresis?:
The DNA was loaded into wells at one end of a porous gel, which acted a bit like a sieve.
An electric current was applied which pulled the negatively-charged DNA through the gel.
The shorter pieces of DNA moved through the gel easiest and therefore fastest. It is more difficult for the longer pieces of DNA to move through the gel so they travelled slower.
2
What is the JOB of the cell membrane?
To protect and organize cells.
how do oxygen and carbon dioxide cross from the alveoli through the capillary walls and into the blood?
Answer:
The concentration gradient of oxygen in your lungs wants to flow toward homeostasis and oxygen is bound on red blood cells by hemoglobin, along with the attraction of oxygen to hemoglobin. The concentration gradient from carbon dioxide from the capillary to the lungs. There is more oxygen in your lungs (alveoli) than there is carbon dioxide and everything want to reach homeostasis, or level amounts on both sides.
Explanation:
how would you expect the return of the wolves to yellowstone to affect the other species there?
Why is it necessary to prepare karyotypes by viewing somatic.
Answer:
Cells can be made to divide and mitosis can be halted at metaphase; both sets of chromosomes need to be examined.
I hope this helps.
Which type of resources form much more slowly than we use them? A: reusable B: renewable C: nonreusable D: nonrenewable
The type of resources from much more slowly than we use them is non-renewable resource. The correct option is D.
What are nonrenewable resources?A non-renewable resource is a natural resource that cannot be replaced quickly enough by natural means to keep up with consumption.
Carbon-based fossil fuels are one example. With the help of heat and pressure, the original organic matter is converted into a fuel such as oil or gas.
Nonrenewable energy sources are not only affecting our planet's atmosphere by increasing greenhouse gas emissions.
Coal and oil combustion emits particles that can pollute the air, water, and land. Some of these particles are captured and stored, but many are released into the atmosphere.
The use of fossil fuels also disrupts Earth's "carbon budget," which balances carbon in the ocean, earth, and atmosphere.
Thus, the correct option is D.
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Which part of the cell does this illustration represent?
Calvin cycle center
mitochondria
cytoskeleton
endoplasmic membrane system
Answer:
Mitochondria
Explanation:
The mitochondrion is an organelle found in both animal and plants cells. However, it is not found in prokaryotic cells. The mitochondrion is most famously known as the powerhouse of the cell because it produces ATP. The defining visual feature of mitochondria is the wavey-like pattern within the organelle.
the part of the diencephalon that is in the anterior and inferior region of the diencephalon is the
Answer:
hypothalamus
The part of the diencephalon that is in the anterior and inferior region of the diencephalon is the Hypothalamus.
What is Hypothalamus?The hypothalamus exists a portion of the brain that includes a numeral of small nuclei with a combination of functions. One of the most important operations of the hypothalamus exists to link the nervous system to the endocrine system via the pituitary gland. The hypothalamus exists discovered below the thalamus and exists as part of the limbic system. The terminology of neuroanatomy, includes the ventral part of the diencephalon. All vertebrate brains include a hypothalamus. In humans, it stands the size of an almond.
The hypothalamus stands answerable for the regulation of specific metabolic functions and other actions of the autonomic nervous system. It synthesizes and secretes certain neurohormones, named releasing hormones or hypothalamic hormones, and these, in turn, promote or inhibit the secretion of hormones from the pituitary gland. The hypothalamus influences body temperature, hunger, important aspects of parenting and affection manners, thirst, fatigue, sleep, and circadian rhythms.
Hence, The part of the diencephalon that is in the anterior and inferior region of the diencephalon is the Hypothalamus.
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the ames test is used to determine whether or not a compound causes __________.
Answer:
mutations
Explanation:
the ames test is used to determine whether or not a compound causes mutations in DNA
hope its helps <3
mark me a sbrainliest
List one other human activity that has led to positive and one other human activity that has led to negative impacts on the oceans?
positive: ecosystem organizations that go out and do things like pick up trash and save animals that were affected by trash.
negative: human waste being thrown into the ocean/humans not recycling to save the ocean
hope that helps luv <3
What would be the safest way to reduce the impact of the the non-native red fire ant while minimizing the impact on other organisms
Answer:
The red fire ant is indigenous to South America. In recent years, this invasive species has become a pest for both humans and other ants
crop destruction
What would be the safest way to reduce the impact of the non-native red fire ant while minimizing the impact on other organisms?
A pouring gasoline on ant mounds
B
spraying broad-spectrum pesticides
с
release a species of fly that will prey on the fire ants
D
treating all species of ants with ant killer
Answer: Release a species of fly that ill prey on the fire ants
Explanation:
I assume that was the question with the answers and I had the same question thru study island so here ya go
What are the effects of enzymes on chemical reactions? Select all of the answers that apply.
Answer:
Enzymes will make chemical reactions go faster. Enzymes are catalysts which will lower the activation energy of a chemical reaction. Activation energy is the energy needed to get a reaction going.
Explanation:
what are the selections?
1. Which of the following statements regarding enzymes is TRUE?
A. Are affected by factors such as temperature and pH
B. Are made up of proteins
C. Function as biological catalysts
D. All of the above
Answer:
D. All of the above
Explanation:
Enzymes are proteins, act as biological catalysts, and are sensitive to factors like pH and temperature.
Hope this helps!
which part of the flower or needed to make seeds?
Answer:
Ovary is the part of the flower which is needed to make seeds
How to calculate allele frequency.
Answer:
by dividing the number of times the allele of interest is observed in a population by the total number of copies of all the alleles at that particular genetic locus in the population
which organelles do both plant and animal cells have in common?