Answer:
Such a cloud, termed a coma, is a distinguishing feature of comets and consists of gases and entrained dust escaping from the cometary nucleus when sunlight causes its ices to sublimate.
ans- d
What are chromosomes?
a.)
A condensed form of DNA that occurs when the cell is dividing
b.)
A form of uncondensed DNA found within the nucleus of the cell
c.)
A structure found within the nucleus that produces subunits of ribosomes
d.)
A cell organelle that houses the DNA and controls activity within the cell
A condensed form of DNA that occurs when the cell is dividing, option (a) is correct.
Chromosomes are condensed structures of DNA that occur when the cell is dividing. During cell division, DNA molecules undergo a process of condensation and coiling, resulting in the formation of visible chromosomes. These structures contain genetic information in the form of genes. Chromosomes ensure that genetic material is evenly distributed to daughter cells during cell division.
They consist of a central region called the centromere, which plays a role in the separation of chromosomes during cell division, and two arms known as chromatids. Each chromatid contains a copy of the DNA molecule. Chromosomes are temporary structures that revert back to an uncondensed form of DNA called chromatin during interphase, the non-dividing phase of the cell cycle, option (a) is correct.
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a. what is theodor heinrich boveri noted for discovering? (1 point)
Answer:
chromosomes are separate, continuous entities within the nucleus of a cell.
Explanation:
Answer:
Theodor Heinrich Boveri (12 October 1862 – 15 October 1915) was a German zoologist, comparative anatomist and co-founder of modern cytology. He was notable for the first hypothesis regarding cellular processes that cause cancer, and for describing chromatin diminution in nematodes.
Transcription of the trp operon is decreased when tryptophan interacts with the _____
- co-repressor
- repressor
- inducer
- promoter
- operator
Transcription of the trp operon is decreased when tryptophan interacts with the repressor, option B is correct.
When tryptophan interacts with the repressor protein in the trp operon, it forms a complex that binds to the operator region. This binding prevents the RNA polymerase from accessing the promoter region, thereby decreasing transcription of the trp operon.
The repressor protein is normally inactive in the absence of tryptophan. However, when tryptophan levels are high, tryptophan molecules bind to the repressor, causing a conformational change that enables the repressor to bind to the operator. This binding effectively blocks the RNA polymerase's access to the promoter, inhibiting the transcription of the trp operon, option B is correct.
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The complete question is:
Transcription of the trp operon is decreased when tryptophan interacts with the _____
A- co-repressor
B- repressor
C- inducer
D- promoter
E- operator
What is the shape of DNA?
Answer:
hey friend..... here is your answer....
the shape of DNA is double helix
Please help ASAP!!!
In the formation of pollen grains, the nucleus in the pollen will divide by mitosis to form two nuclei. Justify.
Answer:
The other two, the generative nuclei, can be thought of as non motile sperm cells. After reaching an ovule and breaking out of the pollen tube tip, one generative nucleus unites with the egg cell to form a diploid zygote.
Explanation:
This means that;
The fertilized egg with two complete sets of chromosomes, one from each parent. The zygote undergoes a limited number of divisions and gives rise to an embryo.
Where are the best geothermal resources located in the U.S?
A. West Coast
B. East Coast
C. South
D. Midwest
help me help me help me help me help me please please
the west coast
Explanation:
yeah it mostly likely that
pls help I will give brainiest!!
what environmental problem does sulphur dioxide cause?
Answer:
When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation. acidify waterways to the detriment of aquatic life
Explanation:
Answer:
deforestation
Explanation:
When sulfur dioxide combines with water and air, it forms sulfuric acid, which is the main component of acid rain. Acid rain can: cause deforestation. acidify waterways to the detriment of aquatic life.
Whoever gets it right i will mark brainest
Answer:
For Desssert: C
For Taiga: A
For Tropical Rainforest: B
Explanation: Because desserts are very hot, we know that there aren't much plants due to the lack of rain/water, they're dry. Rainforests have lots of plants, so it's not B, and since the dessert is high temperature, A is obviously off the list.
Taiga is cold so it won't be good for soil and the plants won't grow as good as the wet rainforest so we can pick A. Then B for #2
What factors limit population growth?
Researchers allow bees to feed from a feeder located 500 meters due south of the hive for several days in a row. They then place a new feeder due south of the hive and place feeders in several other directions from the hive as well, but all are now 450 meters from the hive. They leave the original feeder empty. Next, they determine which feeders that new bees from the hive now visit. What information can they learn from this experiment alone
Answer:
they can learn if Bees are able to calculate distance and direction or if they simply stick to what they know.
Explanation:
From this experiment they can learn if Bees are able to calculate distance and direction or if they simply stick to what they know. Since they have been accustomed to feeding from the feeder that is south they may continue to do so, but since it is not the farthest from the hive and there are other feeders located closer they may chose the new feeder. If they do decide to change feeder, then it tells the researchers that the Bees are able to calculate the distance and know that the new feeders are closer, while which feeder they choose might give them information on how bees determine direction.
What are the rocks that form when dissolved minerals precipitate from water solutions?
Answer: Chemical sedimentary rocks form by precipitation of minerals via water. Precipitation is when dissolved components come out from water. Take a glass of water, for example, and add some salt in it. In the water, salt dissolves.
Explanation:
Y=
18.34
[a] How many kilograms of hydrogen are converted into energy in the Sun every Y seconds? [b] In that same period of time, how many kilograms of helium are produced?
Approximately 0.004032 kilograms of helium are produced in the Sun every Y seconds through the fusion of hydrogen nuclei
To calculate the amount of hydrogen converted into energy in the Sun every Y seconds, we need to consider the mass-energy equivalence given by Einstein's famous equation, E = mc^2.
[a] The Sun converts hydrogen into energy through the process of nuclear fusion. In this process, four hydrogen nuclei combine to form one helium nucleus, releasing energy in the process. The mass of four hydrogen nuclei is approximately 4.032 grams (or 0.004032 kilograms), and the energy released per fusion reaction is about 26.2 million electron volts (MeV) or 4.184 x 10^-12 joules.
To find the amount of hydrogen converted into energy, we can use the equation:
Energy = Mass x (Speed of Light)^2
Mass = Energy / (Speed of Light)^2
Mass = (4.184 x 10^-12 joules) / (299,792,458 m/s)^2
Mass ≈ 4.653 x 10^-29 kilograms
Therefore, approximately 4.653 x 10^-29 kilograms of hydrogen are converted into energy in the Sun every Y seconds.
[b] In the same period of time, the process of nuclear fusion in the Sun also produces helium. Since four hydrogen nuclei combine to form one helium nucleus, the mass of helium produced is equivalent to the mass of four hydrogen nuclei, which is approximately 0.004032 kilograms.
Therefore, approximately 0.004032 kilograms of helium are produced in the Sun every Y seconds through the fusion of hydrogen nuclei.
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What is pisciculture?
Answer:
[tex]\tt{\purple{ Answer }}[/tex]
The breeding, rearing, and transplantation of fish by artificial means is called pisciculture, in other words, fish farming. It is the principal form of aquaculture, while other methods may fall under mariculture. It involves raising fish commercially in tanks or enclosures, usually for food
Renal arteries and veins supply the kidneys with ____________
A. Medulla
B. Blood
C. Oxygen
D. Carbon dioxide
Answer:
They are supplied with blood
Explanation:
Hope this helps
Answer:
B. Blood
Explanation:
What were the first vertebrates to invade land? group of answer choices birds arthropods amphibians reptiles mollusks
The first vertebrates to invade land were amphibians.
Amphibians, such as frogs, toads, and salamanders, were the first group of vertebrates to make the transition from aquatic to terrestrial environments.
This transition is believed to have occurred around 360 million years ago during the Devonian period. Amphibians possess certain adaptations that allowed them to survive and thrive on land, although they still require access to water for reproduction.
The evolution of key features facilitated the successful colonization of land by amphibians.
These features include limbs with digits for locomotion, lungs for breathing air, and a waterproof skin to prevent dehydration. Amphibians also underwent changes in their reproductive strategies to adapt to a more terrestrial lifestyle.
For example, they developed the ability to lay eggs on land or produce waterproof eggs that could be laid in moist environments.
The invasion of land by amphibians was a crucial event in the history of vertebrate evolution. It paved the way for the subsequent colonization of terrestrial habitats by reptiles, birds, and mammals, ultimately leading to the diverse array of terrestrial vertebrate life we see today.
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Please answer correctly. I really need this. Its not a joke.
Thank you
1. What conditions might cause the most water and sediment to be collected at the bottom of the stream table?
Answer: Steep, high velocity, no silting. The high water speed picks up silt from the bottom instead of letting it settle to the bottom. When the land gets level like often happens at the mouth of rivers where the water spreads out and slows down, silt settles to the bottom and you could get a wide, shallow delta.
(Put in own words this is from online hope it helps)
Plants that can best resist a variety of environmental challenges are most likely:_________
Plants that can best resist a variety of environmental challenges are most likely to be adapted or well-suited to the environment in which they grow.
What is adaptation?
It's crucial to remember that different plant species' capacity to withstand environmental difficulties might vary and is impacted by their ecological niche, genetic diversity, and evolutionary history. Additionally, certain plants might combine these characteristics to increase their resistance to a variety of environmental stresses.
High adaptability and plasticity plants are able to modify their growth and development in response to shifting environmental conditions. Because of their adaptability, they can deal with a variety of difficulties, such as variations in temperature, moisture, the availability of nutrients, or lighting conditions.
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The accessory organs assist the digestive organs in the chemical digestion of food. An injury to which organ can hamper the digestion of fats, carbohydrates, and proteins?
Answer:
Pancreas
Explanation:
The Pancreas produces enzymes that aid the digestion of fats, carbohydrates, and proteins.
Answer:
The answer is Pancreas
Explanation:
It is the banana shaped organ, hope this helps!
How does bacteria help rid the earth of dead animals?
Bacteria will bury the bodies of dead animals.
Bacteria will the bodies of dead animals.
Bacteria helps with the decay process.
Answer:
Bacteria helps with the decay process
Explanation:
assuming that the population was in HWE for the G locus, what percentage of moths in the natural population was white in 1962?
A. 2%
B. 4%
C. 8%
D. 20%
E. 64%
The percentage of white moths in the natural population in 1962, assuming the population was in Hardy-Weinberg equilibrium (HWE) for the G locus, is 20% (option D).
In Hardy-Weinberg equilibrium, the allele frequencies remain constant from generation to generation if certain conditions are met. For a single locus with two alleles, such as the G locus in this case, the equilibrium frequencies are p^2 for the homozygous dominant genotype (G/G), 2pq for the heterozygous genotype (G/g), and q^2 for the homozygous recessive genotype (g/g), where p and q are the frequencies of the two alleles.
If we assume that the white allele (g) is recessive and the brown allele (G) is dominant, and the percentage of white moths in 1962 is represented by q^2, then the value of q^2 is 20% or 0.20. Taking the square root of 0.20 gives us the frequency of the white allele (q), which is approximately 0.447. Since q represents the frequency of the recessive allele, the percentage of moths in the population that are white is approximately 44.7%, which is closest to option D (20%).
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Materials are returned to the blood from the filtrate by which of the following processes?
A. filtration
B. selective reabsorption
C. excretion
D. secretion
Selective reabsorption is the method through which components from the filtrate are transferred back into circulation. The correct answer is (B).
In the renal tubules of the kidneys, selective reabsorption takes place when urine is formed. The first stage of filtering takes place in the renal corpuscle, where blood is filtered into the renal tubules through the glomerular filtration barrier. As a consequence, a filtrate made up of water, ions, nutrients, and waste products is created.
Not every component in the filtrate, though, is a waste product that must be removed from the body. In order to sustain homeostasis, certain molecules, including glucose, amino acids, vitamins, and certain ions, must be reabsorbed into the circulation. Active or passive transport of these beneficial compounds from the filtrate in the renal tubules back into the peritubular capillaries surrounding the tubules is involved in selective reabsorption. This procedure aids in preserving vital chemicals and preventing the loss of urine.
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i need it now plz n ty
Match the following terms with the correct definition. Arterioles Arteries Capillaries Venules Veins Small vessels that carry blood away from the heart to the capillaries are __________. Muscular-walled vessels that carry blood away from the heart are _______. One-cell-thick microscopic vessels that function to exchange nutrients and wastes are _________. Small vessels that connect to the capillaries that carry blood back to the heart are ________. Vessels that carry blood back to the heart are _________.
Answer:
Small vessels that carry blood away from the heart to the capillaries are Arterioles. Muscular-walled vessels that carry blood away from the heart are Arteries. One-cell-thick microscopic vessels that function to exchange nutrients and wastes are Capillaries. Small vessels that connect to the capillaries that carry blood back to the heart are Venules. Vessels that carry blood back to the heart are Veins.
Explanation:
We have different types of vessels in our bodies. We can divide them by their size and structure. Starting from the ones that carry blood away from the heath, we have the arteries. Arteries are vessels of big diameter that have muscle around them. Then, the arteries branch into arterioles, which have a smaller diameter. The arterioles branch into capillaries. These are small vessels with thin walls that allow the exchange of nutrients, wastes, and gases with the neighboring tissues. Once that the blood flows through the capillaries, it goes to the venules, which are small veins that will carry the blood to the veins and these to the heart. The veins do not have muscles in their structures, and their walls are thinner than the ones in the arteries.
Frogs and toads belong to the order Anura. The smallest organism in this order is about 7 millimeters long, while the largest member is about 30
centimeters long. Which of these lists best describes this order?
Answer:
Correct question is:
Frogs and toads belong to the order Anura. The smallest organism in this order is about 7 millimeters long, while the largest member is about 30
centimeters long. Which of these lists best describes this order?
a. Order Anura: 338 families, 28 genera, 4360 species
b. Order Anura: 28 families, 338 genera, 4360 species
c. Order Anura: 338 families, 4360 genera, 28 species
d. Order Anura: 28 families, 4360 genera, 338 species
Answer:
b. Order Anura: 28 families, 338 genera, 4360 species
The families are biggest part followed by genera and then each genera has multiple species, this is described by nomenclature of biological species. Therefore option B is correct as the numbers are also increasing because families will be fewer than genera and genera will be fewer than species.
1081_Cellular En
How are cellular respiration and photosynthesis related, in terms of energy?
The energy captured in photosynthesis is used to power cellular respiration.
The energy transformed in cellular respiration is used to power photosynthesis.
Photosynthesis and respiration performt the same task in terms of energy transformation.
Energy is not involved in either photosynthesis or cellular respiration.
ОО
Answer:
D, or the last one stating that energy is not involved.
Explanation:
You can look it up to check, but D is the right answer.
According to this dichotomous key, any catfish must have
a double dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
a single dorsal fin, no small fin on the back near the tail, and barbs near the mouth.
a double dorsal fin, a small fin on the back near the tail, and no barbs near the mouth.
a single dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
a single dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
Answer:
d
Explanation:
a single dorsal fin, a small fin on the back near the tail, and barbs near the mouth.
The average reaction time for drivers paying close attention is -
~ 1 second
~ .25 of a second
~ .75 of a second
~ Immediate - paying close attention enables this
The average reaction time for drivers paying close attention is 0.75 of a second, hence option C is correct.
Driving requires an average response time of 0.75 seconds, or three-quarters of a second. The reaction time is the amount of time it takes you to switch from the accelerator to the brake pedal in response to a scenario on the road.
This is the amount of time it takes to recognize a problem and realize that you need to stop. The average amount of time spent thinking or perceiving is likewise 34 second, or three-quarters of a second.
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The average reaction time for alert drivers is approximately 1 second. Immediate reaction is not feasible due to the time the brain needs to process information and react. Hence, good driving habits, such as maintaining a safe distance and avoiding distractions, are essential.
Explanation:The average reaction time for drivers who are paying close attention is typically about 1 second. This is the time it takes for the driver to perceive a need to react to an event and initiate an action, such as stepping on the brakes or swerving to avoid an obstacle.
It's important to understand that even when paying close attention, immediate reaction is not possible due to human mental and physical processing times.
For this reason, maintaining an adequate following distance and avoiding distractions is critical when driving.
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how has our knowledge of covid-19 evolved
With constant research about the virus, certain medical practices on how the virus was handled is still being studied. For example, the use of ventilators on Covid 19 patients and its effectiveness. Our knowledge is continuously evolving. We also understand better those who are more at risk of the virus and how we can better protect ourselves.
Who are those risk factor of Covid 19?some of the knowledge the society has gained from COVID 19 are;
Older adults, particularly those over 65 are at a higher risk of severe disease and death due to COVID-19
People with underlying health conditions, such as heart disease, diabetes, chronic respiratory diseases, obesity, and immunosuppressive conditions, also have a higher risk of contacting the disease and death.
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Which fossil in the rock layers below is probably the oldest? Explain your answer.
Answer:
Fossil C
Explanation:
Lowest under ground, more time passed.
List three contributing factors of an eating disorder Plzz help ASAP
Answer:
money
Explanation:
Answer:
- serotonin
- cultural pressure
- autism