Answer:
b) that PCG repress transcription by interacting with chromatin
Explanation:
The Polycomb-group (PcG) proteins are evolutionarily conserved proteins in all higher eukaryotes which are involved in establishing epigenetic silencing of developmental genes. In animals, the PcG proteins are well known to form complexes capable of silencing target developmental genes by modulating chromatin structure during embryo development. In Drosophila melanogaster, the Polycomb repressive complex 2 (PRC2) is known to catalyze the trimethylation of lysine 27 on histone H3 (i.e., H3K27me3), thereby silencing homeotic (Hox) developmental genes. The core of the Drosophila PRC2 complex is composed of Enhancer of zeste [E(z)], Suppressor of zeste 12 [Su(z)12], and Extra sex combs (Esc) proteins. The E(z) protein is a well-known histone methyltransferase that maintains the methylation status of Hox genes, thereby silencing their expression during embryo development.
A cell is modified and all of its DNA is removed. What will be the most
immediate impact of this on the cell?
A small, cold creek flows through a dense forest. The trees line the banks of the creek providing shade most of the day. Algae grow well only in a few areas of the creek that receive direct sunlight. Most of the food energy enters the ecosystem in the form of dead leaves that fall from the trees. A fire swept through the forest, burning all the leaves, but leaving the trees standing. This increased the amount of direct sunlight reaching the creek.
As a result of the fire, what increased in the creek? What type of succession will occur to open new available niches and resources?
Succession is the series of changes in an environment which results into making the environment more favorable for the organisms to live in. Pioneer species in the succession after fire will be lichens, fungi, and bacteria.
What is Ecological Succession?
Ecological Succession is the process by which the species and habitat in an area changes over time. Succession is of two types depending upon the condition of the area which are Primary Succession and Secondary Succession. Primary succession is the succession in the area where no organism ever existed whereas secondary succession is the succession in the area where life has existed once but it has been destroyed due to catastrophic activity.
The pioneer species in this area are lichen, fungi, and bacteria. The establishment of organisms in a primary succession starts with the rocks or lava flow that has been hardened, then lichen goes on to the rocks and spews acid which dissolves the rock.
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Why would it be difficult for the motion of the Earth to suddenly change?
Answer:
The good news is that if the Earth's rotation stopped, we wouldn't fall off.
Type the correct answer in the box. Spell all words correctly.
Complete the statement with the correct word.
-blank- is the act of reaping products at the right time of maturity.
Answer:
Harvesting
Explanation:
Im taking the test right now
Answer:
Harvesting
Explanation:
pretty sure its Harvesting sorry if I'm wrong
Choose the option that best matches the description given.
the study of the frequency, distribution, cause, and control of disorders in populations:
Answer:
Epidemiology
Explanation:
I just looked up the definition of epidemiology and the definition was the question, word for word. So like trust me, it's accurate.
Anyways, I hope this helps.
What is the role of gene expression
Answer:
Genes encode proteins and proteins dictate cell function. Therefore, the thousands of genes expressed in a particular cell determine what that cell can do.
Explanation:
The food we eat contains chemical energy. Which statement BEST explains how this energy is released?
a. Cells burn the food molecules which releases energy as heat which powers body
movements.
b. Chemical energy is directly released when eaten food is digested.
c. Cells remove and capture the energy in food molecules all at once, then store it for later
use.
d. Chemical bonds in food molecules are broken, releasing energy and allowing cells to use
the energy to make ATP.
Answer:
D
Explanation:
The chemical bonds in food molecules are broken, releasing energy and allowing cells to use the energy to make ATP. (I don't really have a better explanation, but I hope it's right xd)
Where does the fixed nitrogen that enters the ocean come from?
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The ocean absorbs nitrogen gas from the atmosphere. In open-ocean areas with low concentrations of nutrients (“oligotrophic” regions), some of this nitrogen is taken up by microbes and transformed into various chemical compounds.
ThanksHope it helpson a scale of 1-10, how challenging do you find online learning? What’s going well? What are some of the challenges? What resources would make a difference?
What is the answer to this question
Answer:
force of volcanic eruption
if you dilute a 20.0 mL of a 3.5M solution to make 90.0 mL solution what is the molality of the dilute solution?
Given:
unknown:
show work:
Answer:
Molality of the diluted sample is 0.778 M
Explanation:
Given -
Molality of the original solution = 3.5 M
Volume of the original solution = 20 mL
Volume of the diluted solution = 90 mL
Molality of the diluted sample = X
As we know
Molality of the original solution * Volume of the original solution = Volume of the diluted solution * Molality of the diluted sample
Substituting the given values, we get -
[tex]3.5 * 20 = 90 * X\\X = 0.778[/tex]M
Molality of the diluted sample is 0.778 M
which best describes the concept of natural selection?
A. an organism will always mutate to survive
B. The fittest organisms are selected for
C. Nature selects the organisms with the most Mutations
D. mutations make organisms more fit
Answer:
D.
Explanation:
Natural selection is the way that organisms adapt through adaptations to better survive and pass on the special genes which enable the offspring to survive. Saying an organism will always mutate to survive is wrong, as natural selection implies that not all organisms survive. With natural selection, nothing is "selected", so B and C are not correct. However, mutations DO make organisms "more fit" to survive their environments, so D is the answer.
Answer: The fittest Organisms are selected for
Explanation: Just did the test :)
The biggest egg is the egg of
Answer:
Kiwi bird lays the biggest eggs
Explanation:
Brainliest??? Thanks <3
One way to determine the density of animals in an area is to use the mark-recapture technique. A number of individuals from a population are captured, marked so they are easily identifiable, and released back into the population. It's assumed that the captured and marked animals will randomly mingle with the rest of the population. Later, the population is re-sampled and the number of marked and unmarked animals is recorded. The following equation can then be used to estimate the size of the entire population.
Number of individual marked in first catch/Total population size, N = Number of individual marked in 2nd catch / Total number of 2nd catch
If 25 Prairie Dogs were captured, marked, and released back into their population, and then subsequently 135 Prairie Dogs were captured, of which 18 were marked, what is the approximate total population size, N?
Answer:
N = 187.55
Explanation:
Here you just need to replace the terms and clear the equation.
You already know that,
First capture: 25 prairie dogs.First marked animals: 25 (the whole first capture)You let these animals leave and then you made another capture.
Second capture: 135 prairie dogsAlready Marked animals: 18 (these 18 dogs were caught in the first capture and marked before releasing them)To know the size of the prairie dogs population you just need to use the following equation and clear N, which is the value that you are looking for.
Number of individual marked in first catch/Total population size, N = Number of individual marked in 2nd catch / Total number of 2nd catch
Number of individual marked in first catch = 25 dogsTotal population size, N = this is what we want to knowNumber of individual marked in 2nd catch = 18 dogsTotal number of 2nd catch = 135 dogsSo now, we need to replace terms
25 / N = 18 / 135
25 / N = 0.1333
N = 25 / 0.1333
N = 187.55
g Both transduction and transformation establish that DNA is the genetic material of most living organisms. Both processes involve transfer and expression of DNA from cell to cell. What then is the difference between the two processes: Question 27 options: transduction is mediated by a phage while transformation requires a plasmid Both processes are mediated by a virus transformation is accomplished by a virus, and transduction is carried out by a bacterium transformation is carried out by random uptake of DNA, and transduction by a bacterial virus none of the choices are correct
Answer:
transformation is carried out by random uptake of DNA, and transduction by a bacterial virus
Explanation:
Transformation and transduction are two of the three processes bacteria uses in genetic recombination (the third being conjugation). As rightly stated in the question, both processes establish that DNA is the genetic material of most living organisms and they both involve transfer and expression of DNA from cell to cell.
However, both processes are different in the way they get the foreign DNA into the bacteria cell.
- Transformation involves the random uptake of foreign extracellular DNA by the host bacterial cell.
- Transduction involves the transfer of foreign DNA into a bacteria cell via a virus called BACTERIOPHAGE. N.B: A bacteriophage is a virus that infects a bacteria host.
How does de-icing roads with salt negatively impact the environment? a. The road salt attracts deer that are then hit by motor vehicles. b. It removes necessary salt from the local water courses. c. The high salinity of the surface runoff is harmful to freshwater ecosystems. d. The salt harbors salt eating bacteria that are toxic to animals.
Answer:
c. The high salinity of the surface runoff is harmful to freshwater ecosystems
Explanation:
Looks the most plausible!
The negative effects of deicing roads is that the high salinity of the surface runoff is harmful to freshwater ecosystems.
What is deicing of roads?Deicing refers to the process whereby certain substances are used on the road to melt ice found on the road.
Deicing of roads is usually done with salts which lowers the freezing point of water, thus melting the ice.
The negative effects of deicing roads is that the high salinity of the surface runoff is harmful to freshwater ecosystems.
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Transcription is required to make mRNA. During transcription, the following DNA
sequence is used as a template: GGGTTAC. What is the sequence of the complimentary
strand of mRNA?
Answer:
CCCAAUG
The T in the DNA template strand is replaced by U in RNA. And so base pairing between the DNA template strand and the new mRNA strand is G-C T-A and A-U, (Thymine in DNA is replaced by Uracil in RNA(
Which of the following could alter the expression of genes in an organism?
Select one:
Large numbers of cells being produced at one time.
The deactivation of a particular chromosome in the nucleus.
The loss of cytoplasm from inside of the cell.
A change in the sequence of nitrogen bases in the DNA.
What phenotypes could result from the mitotic crossing over in an individual that is heterozygous for the recessive loci of singed bristles (sn), yellow cuticle (y), and bent bristles (b) given the loci are arranged as follows:
Answer: Hello your question has some missing data attached below is the missing data
answer : single spots for “b”, “sn”, and “y” ( option C )
Explanation:
During the mitotic crossing over in a heterozygous individual the phenotypes that could result are single spots for “b”, “sn”, and “y” . this is because In mitosis/mitotic crossing there is no pairing up and no swapping of chromosomal segments Hence no variations are introduced during mitosis /mitotic crossing
Place the following cell types in the order they are shown to appeared on earth
Answer:
1. Prokaryotic (about 3.5 to 3.8 billion years ago)
2. Photosynthetic (about 3.4 billion years ago)
3. Eukaryotic (about 2.7 billion years ago)
4. Aerobic (about 2.5 billion years ago)
5. Anaerobic (about 2.4 billion years ago)
6. Multicellular (about 600 million years ago)
Explanation:
I am not completely sure but my research indicates the following in chronological order from the oldest to the newest:
1. Prokaryotic (about 3.5 to 3.8 billion years ago)
2. Photosynthetic (about 3.4 billion years ago)
3. Eukaryotic (about 2.7 billion years ago)
4. Aerobic (about 2.5 billion years ago)
5. Anaerobic (about 2.4 billion years ago)
6. Multicellular (about 600 million years ago)
Disclaimer: My answer may be incorrect because I am not completely sure but I think this is right.
If you are fine with it, I would appreciate if I got the brainliest answer :)
According to the question the sequence of the cell type is as follows:
Prokaryotic (Approx 3.5 to 3.8 billion years ago) Photosynthetic (Approx 3.4 billion years ago) Eukaryotic (Approx 2.7 billion years ago) Aerobic (Approx 2.5 billion years ago) Anaerobic (Approx 2.4 billion years ago) Multicellular (Approx 600 million years ago)How did life begin and evolve on Earth?Many scientists consider that RNA, or similar to RNA, was the first molecule on Earth to self-replicate and initiate the process of evolution that led to more advanced forms of life, including human beings.
Thus, the correct sequence is that.
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What is a biodiversity hotspot?
a. a region with a stable number of native species threatened by human impacts
b. a region with a high number of native species threatened by human impacts
c. a region with very few native species threatened by human impacts
d. a region with native species decreasing for an unknown reason
Answer:
My answer is B.
Explanation:
A biodiversity hotspot is a region with a high amount of biodiversity that experiences habitat loss by human activity.
The biodiversity hotspot is "a region with a high number of native species threatened by human impacts".
What is biodiversity?Biodiversity would be the range of organisms that make up ecosystems on Earth, including plants, animals, including microorganisms.
What is level of biodiversity?There are 4 level of biodiversity:
Species Diversity.Genetic Diversity. Ecosystem DiversityFunctional Diversity.Therefore, the correct option will be (c)
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HELP PLEASE DO NOT GIVE ME A LINK
Answer:
Hi, threre the answer is photic zone is the answer
Explanation:
the uppermost layer of a body of water that receives sunlight, allowing phytoplankton to perform photosynthesis.
Which means it has and goes through sunlight.
Hope this helps :)
Which sustainable building practice does the photograph show?
A. Replacing wilderness with buildings to reduce the absorption of
carbon dioxide
B. Reusing old bottles and cans as insulating building materials
C. Using high-density housing to conserve resources
D. Reducing fossil fuel consumption and its associated pollution
SUBMIT
Answer:
The answer is C
Explanation:
Just did it
The sustainable building practice does the photograph show is to using high-density housing to conserve resources. Therefore, option (C) is correct.
The act of caring for these resources so that all living things can benefit from them now and in the future is known as conservation. Natural resources are the source of everything we require for survival, including food, water, air, and shelter.
Recycling the resource allows us to conserve it. For instance, many items can be recycled and repurposed into new ones. Recyclable materials include paper, plastic, glass, metal, and even electronic goods.
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Studies show that exposure to toxic environments as a child __________.
A)
may have lasting health effects
B)
contributes to deliquent behavior risks
C)
may not show any effect until adulthood
D)
increases in the risk of certain childhood disorders
E)
all of the above
Answer:
E) All of the above
Hope this helps!
--Applepi101
Answer:
All of the above
Explanation:
All of these are major effects for children, if they get exposed to toxic enviornment these are all possible effects.
Space exploration can lead to money going to U.S.
businesses and universities.
What are two things NASA might hire U.S. businesses and universities to do?
A. Teach people to read
B. Improve athletic teams
C. Build complex equipment
D. Research new ideas
Answer:
build complex equipment andddd research new ideas
Explanation:
hope this helps yall!!!
Answer:
C & D
Explanation:
Ap3x
the exact location within the chloroplast in which the dark phase of photosynthesis occurs
Answer:
The Light Reactions occur in the grana and the Dark Reactions take place in the stroma of the chloroplasts
Explanation:
Answer:
Light Reactions occur in the grana and the Dark Reactions take place in the stroma of the chloroplasts
Explanation:
Internet search
Which of the following is true about the Calvin cycle?
Answer:
The following??
Explanation:
A cell with 18 chromosomes undergoes the cell cycle. How many daughter cells are created? Each daughter cell has how many chromosomes? *
Answer:
Each daughter cell will also have 18 chromosomes.
1. Look at the images below. Which two organisms do you think are most closely
related?
2. And why do you think this?
A deer and worm and turtle
Answer:
deer ans turtle
Explanation:
they both share the characteristics of four legs and a tail unlike thw worm
A laboratory technique called polymerase chain reaction (PCR) produces millions of copies of a DNA molecule in only a few hours. What process is most similar to PCR?
A. Mitosis
B. DNA replication
C. Transcription
D. Translocation