Why is the structure of a
nucleosome so important?
Answer:
In eukaryotes, nucleosomes play major roles in chromatin organization and gene expression
Explanation:
In eukaryotic organisms, chromosomal DNA is packaged with the help of proteins called 'histones' to form chromatin. The nucleosomes represent the basic packing units of the chromatin. Each nucleosome is composed of a histone octamer containing each two histones H2A, H2B, H3 and H4 wrapped around by 147 bp of DNA. Nucleosomes act as scaffolds to form higher-order chromatin structures (i.e., 30-nm chromatin fibers and condensed chromosomes). Moreover, nucleosome histone proteins can be chemically modified at defined amino acid residues, and thus nucleosomes also provide an epigenetic layer of information that can promote or inhibit gene expression.
Why does DNA need to be replicated
Replication is an essential process because, whenever a cell divides, the two new daughter cells must contain the same genetic information, or DNA, as the parent cell. ... Once the DNA in a cell is replicated, the cell can divide into two cells, each of which has an identical copy of the original DNA.
Answer:
DNA replication needs to occur because existing cells divide to produce new cells. Each cell needs a full instruction manual to operate properly. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions!
Explanation:
DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules. Replication is an essential process because, whenever a cell divides, the two new daughter cells must contain the same genetic information, or DNA, as the parent cell.
The replication process relies on the fact that each strand of DNA can serve as a template for duplication. DNA replication initiates at specific points, called origins, where the DNA double helix is unwound. A short segment of RNA, called a primer, is then synthesized and acts as a starting point for new DNA synthesis. An enzyme called DNA polymerase next begins replicating the DNA by matching bases to the original strand. Once synthesis is complete, the RNA primers are replaced with DNA, and any gaps between newly synthesized DNA segments are sealed together with enzymes.
DNA replication is a crucial process; therefore, to ensure that mistakes, or mutations, are not introduced, the cell proofreads the newly synthesized DNA. Once the DNA in a cell is replicated, the cell can divide into two cells, each of which has an identical copy of the original DNA.
I NEED HELP ON THIS HURRY
Answer:
hHSS (human Hepatic Simulator Substance)
Explanation:
Which of the following is a true statement?
A. Controlled experiments demonstrate that plants gain most of their mass from water.
B. Because matter cannot be created, plants must gain their mass from water, soil, or air.
C. Plants grow larger when planted in nutritious soil because they are taking in more mass from the nutrient-rich soil.
D. Plants gain most of their mass from water and the nutrients they absorb from the soil.
Answer:
C. Plants grow larger when planted in nutritious soil because they are taking in more mass from the nutrient-rich soil.
Explanation:
hope this helps :)
Gel electrophoresis is used to separate DNA fragments on the basis of
their
1) Size
2) Color
3) Chromosomes
O4) Functions
Answer:
1. Size
Explanation:
In gel electrophoresis, dna is separated by size. The largest goes to the top and the smallest to the bottom. Hope it helps :)
pls help :((((((((((((((((((
Answer: i believe it's C or D
Explanation:
What sequence of bases on RNA would match or pair with the following DNA sequence:
ATC
A. ATC
B. GUA
C. UAG
What is the technical term for having too little oxygen in your tissues?
Answer: Hypoxia
Explanation:
what have the ancestral limbs of
snakes become?
aquired
vestigeal
homologous
Chil
analogous
Answer:
Pythons and boa constrictors have tiny hind leg bones buried in muscles ... Vestigial legs are a clue that snakes descended from lizards. Over 100 million years ago, some lizards happened to be born with smaller legs, which, ... The ancestor of boas and pythons retained very small vestigial legs
Explanation:
explain how the herbicide can inhibit the transport of minerals in the weed plants?
Answer:
Herbicides kill or suppress plants by interfering with essential plant processes such as photosynthesis. All of the interactions between an herbicide and a plant from application to the final effect are referred to as the mode of action.
Explanation:
hope it helps u
FOLLOW MY ACCOUNT PLS PLS
The __________ system consists of the brain, spinal cord and nerves.
A. nervous
B. circulatory
C. digestive
Answer:
A. Nervous
Explanation:
cmon man is this even a question??
Which statement best describes the observations made by students after spraying water on the model to simulate rain?
Answer: the answer is surface runoff, you’re welcome
Explanation:
I just took this test and got a 100
Please help no ones helping or giving real answers... will mark branliest
Answer:
B
A
D
Explanation:
Which best describe and organisms niche?
Answer:
A niche is a role a species plays in the ecosystem. In other words, a niche is how an organism “makes a living.” A niche will include the organism's role in the flow of energy through the ecosystem. An organism's niche also includes how the organism interacts with other organisms and its role in recycling nutrients.
Give brainliest please!`(*>﹏<*)′
Which statement best describes the fossil record?
It is a complete record.
It is an incomplete record.
Most fossils are older than five billion years.
All fossils are younger than six hundred years.
Answer:
incomplete record
Explanation:
I just took the test
Answer:
B It is an incomplete record.
Explanation:
A large community of plants and animals that occupy a district region of the world is a
30. Why was the paddlefish selected for study?
two reasons wy it's important to conserve Soth Africa's plants and animals
Answer:
The benefits of conserving biodiversity are numerous. A large proportion of South Africa's population are directly dependent upon biological resources for subsistence purposes, including the gathering, harvesting or hunting of animals and plants for food, medicine, shelter, fuel, building materials, and trade.
Explanation:
What is the goal of the cell cycle? *
5 points
To maintain cell homeostasis by maintenance of the cell membrane
Regulation of cellular activities related to energy conversion
Provide the cell with the needed nutrients for surival
The correct replication of DNA, followed by the correct division of DNA, to create two
identical daughter cells
Answer:
The correct replication of DNA, followed by the correct division of DNA, to create two identical daughter cells
Explanation:
The most basic function of the cell cycle is to duplicate accurately the vast amount of DNA in the chromosomes and then segregate the copies precisely into two genetically identical daughter cells.
Hope this helped!!!
¿Qué es una droga según la OMS?
¿Qué significa que la droga sea una sustancia psicoactiva?
¿Qué es una adicción?
¿Cuál es el efecto de las drogas depresoras?
¿Cuál es el efecto de las drogas estimulantes?
¿Cuál es el efecto de las drogas alucinógenas?
¿Qué es una droga legal?
¿Qué es el tabaquismo y cuáles son los daños a la salud que provocan?
¿Qué es el alcoholismo y cuáles son los daños que provocan a la salud?
¿Qué es la marihuana y qué efectos positivos y negativos provoca en la salud ?
Answer:
Uno... Una droga es cualquier sustancia (a excepción de los alimentos y el agua) que, cuando se ingiere, altera la función del cuerpo, ya sea física o psicológicamente. Las drogas pueden ser legales (por ejemplo, alcohol, cafeína y tabaco) o ilegales (por ejemplo, cannabis, éxtasis, cocaína y heroína).
Dos... Una droga u otra sustancia que afecta el funcionamiento del cerebro y provoca cambios en el estado de ánimo, la conciencia, los pensamientos, los sentimientos o el comportamiento. Ejemplos de sustancias psicoactivas incluyen alcohol, cafeína, nicotina, marihuana y ciertos analgésicos.
Tres... La adicción es un trastorno biopsicosocial que se caracteriza por el uso repetido de drogas o la participación repetitiva en un comportamiento como el juego, a pesar del daño a sí mismo y a los demás.
Cuatro... Cuando se usan depresores, los efectos a menudo incluyen ataxia, ansiolisis, alivio del dolor, sedación o somnolencia y deterioro cognitivo / de la memoria, así como en algunos casos euforia, disociación, relajación muscular, disminución de la presión arterial o frecuencia cardíaca, depresión respiratoria y anticonvulsivante. .efectos.
Cinco... Ansiedad; tensión; aumento de la temperatura corporal; náusea; temblor; convulsiones coma; muerte.
Seis... Los efectos de los alucinógenos, como el LSD, varían de persona a persona y dependen de la cantidad que se ingiera.
Siete... Las drogas legales son aquellas que se pueden vender, poseer y usar legalmente, aunque a menudo con ciertas restricciones. Incluyen tabaco, alcohol, cafeína, sustancias volátiles y medicamentos de venta libre y recetados. 2 Las drogas ilegales o controladas son aquellas cuya venta, posesión o uso constituye un.
Ocho... Fumar, el acto de inhalar y exhalar los vapores de material vegetal en llamas. Se fuma una variedad de materiales vegetales, incluida la marihuana y el hachís, pero el acto se asocia más comúnmente con el tabaco que se fuma en un cigarrillo, cigarro o pipa. Fumar causa cáncer, enfermedades cardíacas, accidentes cerebrovasculares, enfermedades pulmonares, diabetes y enfermedad pulmonar obstructiva crónica (EPOC), que incluye enfisema y bronquitis crónica. Fumar también aumenta el riesgo de tuberculosis, ciertas enfermedades oculares y problemas del sistema inmunológico, incluida la artritis reumatoide.
Nueve... Los órganos que se sabe que están dañados por el abuso de alcohol a largo plazo incluyen el cerebro y el sistema nervioso, el corazón, el hígado y el páncreas. El consumo excesivo de alcohol también puede aumentar la presión arterial y los niveles de colesterol en sangre, los cuales son factores de riesgo importantes de ataques cardíacos y accidentes cerebrovasculares.
Diez... Los aspectos positivos y negativos: Cómo la marihuana afecta su cerebro y su cuerpo ... También puede acelerar la pérdida de células cerebrales relacionada con la edad, aunque se ha demostrado que la marihuana ... El alcohol y los cigarrillos tienen efectos adversos para la salud mucho peores.
Espero haber ayudado!!!
which feature of a human is controlled by genes only
Pls someone help me!!
How can Punnett squares be used to determine an organism's genotypic and phenotypic probabilities?
How can Punnett squares be used to determine an organism's genotypic and phenotypic probabilities?
⭐A Punnett square allows the prediction of percentages of phenotypes in the offspring of a cross of known genotypes. A Punnett square can be used to determine a missing genotype based on other genotypes involved in a cross.⭐----------------------------------------------------------------------------------------------⭐
BRAINLYMENTALMENTEdescribe the following interms of water cycle
(energy sources)
(carrier of nutrients)
Answer:
Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff.
Explanation:
1. The conversion of liquids into gas is termed
as Evaporation.
2. The conversion of Gas into liquids is called
Condensation.
3. The falling of water droplets in the form of
rain after condensation of clouds is called
Precipitation.
4. The cyclic exchange of water into its different
stages is called Water Cycle.
5. The amount of water vapor present in the
atmosphere is called the Humidity.
Will give Brainly plz help
Answer:
C
Explanation:
Silicone disulfide
3 Calculate the acceleration of a car that went from zero to 60 m/s in 2.4 seconds Include units.
Answer:
25m/s^2
Explanation:
acceleration= change in velocity/time
change in velocity is 60 (60-0)
Answer:
The answer to that question is...well...I have no idea .-. sorry.
Explanation:
PS: PLEASE DO NOT PUT A LINK IN THE ANSWER SECTION!
although only 3%of earth's surface is covered with freshwater, where are these biomes found?
a. globally
b. asia
c. north and south america
d. europe and africa
Answer:
A Globally
Explanation:
i took the quiz and got it right.
Answer:
globally
Explanation:
They are spread out
What is the difference between the molecules with a solid, liquid and gas?
Answer:
Gas are well separated with no regular arrangement.
liquid are close together with no regular arrangement.
solid are tightly packed- the particles are close together.
Hope this helps:)
Answer:
Solid: Molecules are tightly together to hold the shape.
Liquid: Molecules float around to fill the space of the container that they are in.
Gas: Molecules have no definite shape and move freely.
I will give tons of points to the perfect answer. What is the meaning of life?
Answer: The meaning of life is multiple things.
Explanation: Experiencing things you've dreamed of figuring yourself out like if your part of LGBTQ+ and having a family finding love working towards retirement spending everyday with the person you love and giving a helping hand to those in need.
a point mutation changes the DNA sequence CGA to CGT but the same protein is still produced. which point mutation occurred
Answer: The correct answer is silent mutation . In this type of mutation there is no change in the phenotype of the individual which means there occurs a mutation where two different amino acid codes for the same protein .There are sequences present in the body where a point mutation occurs but the protein formed is still the same .If you will see the genotype you can easily observe that the amino acid sequence is different but the protein formed is same. Example AAA codes for lysine and the amino acid lysine is formed by AAG .
HOPE THIS HELPS
Answer:
silent mutation
Explanation:
hope this helps
Please help me?? I need help labeling the graph using the word bank
Answer:
Explanation:
Oceanic PlateSubduction ZoneConvection CurrentsAsthenosphereContinental PlateThe Oceanic Plate is located near the ocean ridge. Which represents where magma creates new oceanic crust.
The Subduction Zone is where the tectonic plates meet. These are called plate boundaries.
Convection Currents are what drives the movement of rigid tectonic plates in Earth's molten mantle.
The Asthenosphere is the upper layer of the mantle. Which is below the lithosphere (Continental Plates).
Continental Plates are the outer shell of the mantle.
Let me know if this helps!