The statements that accurately describe the views of scientists about dark matter are;
Scientists have hypotheses about dark matter but need more data to test ideas.New data could cause scientist to change their hypotheses about dark matter.Scientists do not really understand what dark matter is but they have ideas about the things it is not.
For instance, scientists know that dark matter is not bright like our planet and the stars. This can be deduced from its name, "dark matter."
Scientists also believe that dark matter is not composed of antimatter. If it were, they would be able to detect this through the emission of gamma rays.
Scientists have other speculations but if new data comes with convincing proofs, they may have to change their present hypotheses.
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Answer:
New data could cause scientists to change their hypotheses about dark matter.
Scientists have hypotheses about dark matter but need more data to test their ideas.
What problems do animal cells have since they don't have cell walls?
Answer:
These antibiotics bond to protein molecules on the existing wall and prevent the cell from adding any new material as the wall stretches. When the cell wall stretches too far, it becomes weak and eventually bursts, destroying the cell. Since animal cells don't have cell walls, they are not affected by penicillin.
Explanation:
which combination of cells and growth factors would serve as the control group?
Answer:
These stimuli, called growth factors, are naturally occurring proteins specific to certain groups of cells in the body. They include nerve growth factor, epidermal growth factor, and platelet-derived growth factor.
Explanation:
Hope this helps.
Growth factors are defined as the proteins that bind to specific receptors, which activate the cascade of signal transductions. The growth factors lead to proliferation, apoptosis, and development.
Different types of growth factors stimulating the signal transduction are:
1. Nerve growth factor is controlled by the gene NGF. It provides the instructions to make the beta protein, which is important for the survival and development of the nerve cell.
2. Epidermal Growth Factor is a type of factor that stimulates cell development and cell proliferation. It generally stimulates the fibroblasts and epithelial cells.
3. Platelet-derived growth factor regulates cell division and growth. These factors help in healing and repairing the wound and walls of the damaged blood vessels.
Thus, the growth factors when bound to specific cell receptors control the various activities of the cells.
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how do cells get the correct number of chromosomes?
Answer:
"During cell division, a mother cell divides into two daughter cells, and during this process, the DNA in the mother cell, wrapped up in the form of chromosomes, is divided into two equal sets. ... This finding gives us a glimpse of an important step in the process of cell division."
Explanation:
which molecules are the products of aerobic respiration?
Answer:
Ethanol and carbon dioxide are products of anaerobic respiration.
Explanation:
I HOPE THIS HELPS!!!!
osmosis results in a net movement of __ from a solution that has a __ solute concentration to a solution with a __ solute concentration.
Answer:
Formally, osmosis is the net movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
Explanation:
Hope it helps :P
osmosis is the net movement of water through a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration
what is osmosis ?Osmosis is defined as the passive process in which the molecules move from a region of higher concentration to lower concentration until the concentrations become equal on either side of the membrane with out expenditure of external energy.
Gases and supercritical liquids are solvent undergo the process of osmosis; It can be up two types such as Endosmosis where a substance in a hypotonic solution, the solvent molecules move inside the cell and the cell becomes turgid by a process of deplasmolysis.
When a substance in a hypertonic solution, the solvent molecules move outside the cell and the cell becomes flaccid or undergoes plasmolysis. This is known as exosmosis.
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during which phase of the cell cycle are the chromosomes duplicated?
The chromosomes duplicate during the S phase.
hope this helped!!
Sort each description into correct category.
How does wood that is not burning differ from a nonflammable materials?
Wood is flammable, which means that it can burn when it is exposed to heat, oxygen, and an ignition source (such a spark or flame).
Thus, Nonflammable materials are those that do not readily ignite and do not burn even when exposed to high temperatures or flames.
Combustion Behaviour: During a fire, when wood is exposed to heat and oxygen, a combustion process takes place, releasing heat, light, and numerous combustion byproducts like carbon dioxide and water vapour.
The fire is maintained and can spread as a result of this procedure. Even when exposed to high heat or flames, nonflammable materials do not burn and do not support a fire.
Thus, Wood is flammable, which means that it can burn when it is exposed to heat, oxygen, and an ignition source (such a spark or flame).
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how many chromosomes do human sperm and egg cells have?
diffusion and osmosis are examples of __ transport.
5. The human immune system is a complex network of cells and organs that evolved
to fight off infectious pathogens. Vaccines teach the immune system by mimicking
a natural infection. The influenza vaccine, contains a weakened form of the virus
that doesn't cause severe disease or reproduce very well. Human white blood cells
(WBC's ) can't tell that the vaccine viruses are weakened, so they kill the viruses.
Antibody levels start to decline over time and the influenza virus evolves very
rapidly. Why does and individual need to get a yearly flu vaccine?
Answer:
the flu virus mutates to different form so updating the vaccine is helpful
Explanation:
where does the citric acid cycle take place in a eukaryotic cell?
Answer:
Within the mitochondrion
Explain:
the citric acid cycle occurs in the mitochondrial matrix, and oxidative metabolism occurs at the internal folded mitochondrial membranes
GIVE ME GOOD ANSWER PLEASE! WILL MARK AS BRAINLIEST Remove a filament and anther from the flower, and write down your observations. Then, shake the pollen grains from the anther onto a microscope slide, add a drop of water, and place a coverslip on it. Observe the slide under a magnifying glass or a microscope. Describe the differences between the observations made with the naked eye and under magnification. If using a microscope, record specific observations for each magnification used.
Answer: when you put the pollen under a microscope you can see that the pollen isn’t just yellow and looks like dots but that that each one has a different shape and size
Explanation:
Which of the following ecosystem services is categorized as regulating?
Wood fuel, medicine, and potable water
Pollination, decomposition, and water purification
Recreation, education, and aesthetics
Photosynthesis, nutrient cycling, and creation of soils
While jogging, energy transformations occur in the body.
Which flowchart best describes the energy transformation that happens while
jogging?
A. Potential energy chemical energy
B. Electrical energy potential energy
C. Chemical energy — kinetic energy and thermal energy
D. Kinetic energy thermal energy and electromagnetic energy
Answer: Well according to me, the answer is ,
C. Chemical energy — kinetic energy and thermal energy
Explanation: I am not saying that it is a 100% right but according to me thats what is should be.
Hope you found what you're looking for. Have a nice day.
Answer:
chemical energy kinetic energy and thermal energy
Explanation:
took the test it's correct
What did Hershey and Chase work
with and discover?
A. Bacteriophages which they found used DNA to
infect bacteria
B. X-rays on DNA that revealed it's shape
C. Two bacteria that could transform a material that
would bring them back to life when one was killed
D. Used chemical experiments to determine the bases
that paired together
Explanation:
A. Bacteriophages which they found used BNA to infect bacteria
There are four blood groups: A, B, AB and O.
Explain how a father who is blood group A and a mother who is blood group B can have a child that has
blood group O. (2)
Answer:
it is because when breaking blood groups of parents they are (IAIO ) for mother and (IAIO) for the father , meaning both blood groups foe the parents has component (O) and during crossing of genes blood group O for a child can be a possible blood group.
Identify the mood in the following sentences:
Shelly lightly skipped across the playground and found the brightest yellow flower; her smile beamed with glee.
A. Hesitant
B. Hungry
C. Joyous
blood is distributed from the surface of a bone to deeper central canals through channels known as
Blood is distributed from the surface of a bone to deeper central canals through channels known as Haversian canals.
What is Haversian canal?
Haversian canals are small channels that run through the bone tissue, and they serve as the highways for blood vessels, nerves, and lymphatic vessels. They distribute blood and other essential nutrients to the bone tissue and allow for the removal of waste products.
These canals are surrounded by concentric layers of bone matrix, known as lamellae, and they help to maintain the structural integrity of the bone. The distribution of blood through the Haversian canals is essential for the health and maintenance of the bone tissue.
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protein synthesis is a multistep process. put the steps of protein synthesis in sequential order.
Answer:
Replication - Transcription - Translation
Explanation:
Replication duplicates the DNA so that happens first. Then in transcription converts the DNA to mRNA which goes to the cytoplasm to make proteins. In translation proteins are made when codons and anti codons join to make amino acids which create the proteins.
Protein pumps are efficient because they
(Plz help)
In reference to the options listed in the image, we can say that protein pumps are efficient because they can move two types of molecules, which makes option B correct.
A protein pump is a kind of protein, often found in the cell membrane, that has the capability to pump specific substances in and out of the cell. Most of the processes that happen at the cellular level are naturally optimized for efficiency, even when the process consumes energy, as is the case with the protein pump.
The reason that the protein pump is considered efficient lies in how it uses the energy. Despite being an active process that consumes ATP to function, protein pumps are considered efficient because they can move two types of molecules at the same time, using the same molecule of ATP. This allows the cell to get more done for the same amount of energy.
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If the pH of a solution Is increased from pH 5 to pH7 it means that the?
Answer:
If we refer to pH scale, pH = 7 means neutral solution pH > 7 means basic solution pH < 7 means acidic solution - pH: potential of hydrogen - pOH: power of hydroxide
Answer: it has gained more acidic
Explanation:
Which organic molecules serve as a catalyst in chemical reactions? O lipids O proteins onucleic acids carbohydrates
Answer:
Proteins
Explanation:
An ecologist in Costa Rica wanted to determine the PGR for the country in 2018, and collected all of the data necessary to calculate the rate. She concluded that there were 34,560 births and 2,310 deaths within their population of 100,000. There were also 478 immigrants and 126 emigrants that year. What was the population growth rate for Costa Rica?
The population growht rate is 32.602 % per year. Population growth can be calculated as = (births + immigrants) - (deaths + emigrants).
In this case, population growth is equal to = (34,560 births + 478 immigrants) - (2,310 deaths + 126 emigrants) = 32,602 new individuals per year
Total (original) population: 100,000 _____ 100%
32,602 _____ X
In consequence, the population growth rate per year can be estimated by the following equation:
X = (32,602 x 100)/ 100,000 = 32.602 %
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Which statement below accurately describes how sweating helps maintain homeostasis?
A. Skin cells absorb water into the body, which absorbs heat and cools the cells
B. Water on the skin evaporates into the air, pulling heat from the body
C. Water condenses on the skin and absorbs heat from the body
D. Water on the skin evaporates into the air, pulling heat out of the air around the body
Answer:
A. Skin cells absorb water into the body, which absorbs heat and cools the cells. Please mark me brainliest
Explanation:
Answer:
B
Explanation:
Water on the skin evaporates into the air, pulling heat from the body, accurately describes how sweating helps maintain hemostasis.
menciona las 10 razones por las cuales la educación en salud es necesaria
Answer: sie
Explanation:
Which phase of mitosis is the shortest?
Answer:
Anaphase
Explanation:
Answer:
Anaphase
Explanation:
Anaphase is the shortest stage of mitosis.
Which of the following is NOT
how mitochondria could have
become part of the eukaryotic
cells?
A. It may have entered as a parasite.
B. It may have been engulfed.
C. It may have entered through photosynthesis.
Please help
Answer:
Its C
Explanation:
tell us one way that saturated fats and unsaturated fats are different.
hazards to humans that come into contact with it,
4. Study the graphs in the stimulus. Order the events that occurred at the Bodega Bay study
site, where scientists used traps to catch and count samples of marine organisms, from
1to 5. Write a 1 by the first event to occur and a 5 by the last event.
5 The number of native clams per sample falls from 100 to 10.
1 Scientists find European Green Crabs in Bodega Bay.
4 Scientists find that the number of native clams per sample has risen to 40.
3 The number of native shore crabs per sample falls from 25 to 20.
2 The number of European Green Crabs per sample falls from 5 to 4.