What do you mean with “ddt” ?
Water molecules readily form hydrogen bonds with other polar molecules, and when they encounter nonpolar molecules they must form hydrogen-bonding networks with neighboring water molecules. Which of the following molecules will cause a "cage" of water to form?
Select one:
a. 2-methylpropane
b. acetone
c. methanol
d. urea
Answer:
a. 2-methylpropane
Hope this helps :)
Final answer:
A. 2-methylpropane will cause a cage of water to form around it because it is nonpolar, leading water molecules to maximize hydrogen bonding among themselves.
Explanation:
The molecule that will cause a "cage" of water to form due to its nonpolar nature is 2-methylpropane. Water is a polar solvent with molecules that can form up to four hydrogen bonds with each other or with other polar substances. Options like acetone, methanol, and urea, with their polar functional groups, are capable of interacting with water through hydrogen bonding.
But 2-methylpropane lacks this capability because it is nonpolar. As a result, water molecules around 2-methylpropane form a structured network, or clathrate cage, as they cannot bond directly with the molecule and instead maximize hydrogen bonding among themselves.
From where is it believed that most comets originate?
A) Orion’s Belt
B) Oort belt
C) Kuiper belt
D) asteroid belt
* I don’t know if I’m right I believe it is c someone correct me if I’m wrong
Final answer:
Most comets are believed to originate from the Oort cloud, which is the source of long-period comets, and the Kuiper belt, associated with short-period comets or Jupiter-family comets.
Explanation:
It is believed that most comets originate from two primary regions in our solar system: the Oort cloud and the Kuiper belt. The Oort cloud is an extensive shell of icy objects that lies far beyond Pluto, enveloping the solar system out to about 50,000 astronomical units (AU) from the Sun. This distant reservoir contains trillions of cometary nuclei and is the source of long-period comets, which can have orbits lasting hundreds or even thousands of years.
On the other hand, the Kuiper belt is a disk-shaped region beyond Neptune, extending to approximately 50 AU. It is made up of ice-and-rock planetesimals, which are remnants of the building blocks of the planets. This area is the origin of short-period comets, typically called Jupiter-family comets, which have shorter orbits lasting less than 200 years due to gravitational interactions with the giant planets, especially Jupiter.
While the Oort cloud is believed to house the majority of comets in the solar system, the Kuiper belt is responsible for a significant number of observable comets, including some that have been the target of spacecraft missions. Therefore, in response to the original question, it's important to recognize that both B) Oort cloud and C) Kuiper belt are sources of comets, but the Oort cloud is considered the primary reservoir for most comets.
What's a disadvantage of the point count method of population monitoring? It leads to the death of the sampled individuals. It only records trends in population at fixed locations in the ecosystem. It requires traversing through the ecosystem, which may be difficult in rugged terrain. It's only useful for monitoring organisms that are fixed in one place. It requires capturing the animal for a brief period of time.
Answer:
It only records trends in population at fixed locations in the ecosystem.
Explanation:
The point count method is a method used to monitor the populaton of birds in certain places that consists on having someone fixed at one spot and record all the birds that he can spot by sight and by ear, so if he sees or hears a certain bird he records it, to have a close idea of the species of birds that there are in a certain location, the problem would be that it only records trends at fixes locations in the ecosystem.
The disadvantage of the point count method of population monitoring is that It only records trends in population at fixed locations.
What is Point count method?This is a method which involves the counting of species in an ecosystem with the individual being fixed at a point and counts on sight.
This system of counting only records trends in population at fixed locations.
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Which cell organelle is the site of protein synthesis?
A.)endoplasmic reticulum
B.)ribosome
C.)nucleus
D.)mitochondrion
Im gonna say C. Nucleus
The site of protein synthesis in a cell is the ribosome, which translates the cell's DNA instructions to produce proteins. Therefore, the correct answer is 'B) Ribosome'.
Explanation:The cell organelle that is the site of protein synthesis is the ribosome. Ribosomes, which can be found either floating freely within the cell or attached to the endoplasmic reticulum, are responsible for the production of proteins. They do this by translating the instructions encoded in the cell's DNA. This process involves linking together amino acids in the specific sequence dictated by the DNA's instructions to form a protein molecule. So, the correct answer to your question is 'B) ribosome'.
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Which structure of a flowering plant contains female reproductive cells, or eggs?
Answer: ovules
Explanation: Each carpel includes an ovary (where the ovules are produced; ovules are the female reproductive cells, the eggs), a style (a tube on top of the ovary), and a stigma (which receives the pollen during fertilization). The Male Reproductive Organs: Stamens are the male reproductive parts of flowers.
Final answer:
The ovary is the structure within a flowering plant that contains female reproductive cells, or eggs, and is part of the gynoecium, including the stigma and style.
Explanation:
The structure of a flowering plant that contains female reproductive cells, or eggs, is the ovary. The ovary is part of the gynoecium, which comprises the stigma, style, and ovary. The eggs, housed within the ovary, are technically referred to as ovules until they are fertilized, at which point they can develop into seeds after successful pollination and fertilization processes. Flowers facilitate the reproduction of plants by ensuring the transfer of pollen from the male structure to the female structure, allowing the pollen tube to grow through the style to reach the ovary and thus fertilize the ovule.
What is true of the Cambrian explosion? What is true of the Cambrian explosion? There are fossils of animals in geological strata that are older than the Cambrian explosion. The Cambrian explosion marks the appearance of filter-feeding animals in the fossil record. The Cambrian explosion is evidence for the instantaneous creation of life on Earth. Only the fossils of microorganisms are found in geological strata older than the Cambrian explosion.
The Cambrian explosion, approximately 541 million years ago, marks a rapid increase in the diversity and complexity of animal life. Although there are older fossils, and previous life forms were likely simpler, mainly composed of individual cells. The period doesn't support instantaneous creation but rather a period of rapid adaptability and speciation.
Explanation:The Cambrian explosion refers to a period in Earth's history, approximately 541 million years ago, when there was a rapid increase in the diversity and complexity of animal life. This event, which lasted about 13 to 25 million years, was characterized by the appearance of many of the major groups of animals that exist today. There are indeed fossils of animals that are older than the Cambrian explosion, but the explosion itself marked a significant increase in the variety and complexity of life forms.
It is true that filter-feeding animals appeared in the fossil record during this time. However, the Cambrian explosion does not support the idea of instantaneous creation of life. Rather, it supports the theory of evolution, suggesting a period of rapid adaptability and speciation.
Prior to the Cambrian explosion, most organisms were simple, composed mainly of individual cells occasionally organized into colonies, thus, finding only fossils of microorganisms in geological strata older than the Cambrian explosion is typically correct.
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The biological interaction in which one organism hunts, kills, and eats another organism for energy is known as _______.
The answer is predation because when a living organism eats another living organism (predator eating prey) it is predation and also the cycle of life. (Like how we eat our foods in our everyday life lol)
Final answer:
Predation is a biological interaction in which one organism hunts, kills, and eats another organism for energy. It is important for maintaining balance in ecosystems.
Explanation:
Predation is a biological interaction where one organism hunts, kills, and eats another organism for energy. This interaction occurs between a predator, which feeds on another living organism called the prey. Predation is an essential mechanism for maintaining the balance of organisms in an ecosystem. Examples of predator-prey relationships include lions and zebras, bears and fish, and foxes and rabbits.Predation is a biological interaction in which one organism hunts, kills, and eats another organism for energy. It is important for maintaining balance in ecosystems.
Where in the body is hydrochloric acid found
Hydrochloric acid is found in the stomach
The stomach is where hydrochloride acid is found.
Which of the following conditions occurs when blood flow to the brain is interrupted and is a risk of high blood pressure? A. Heart attack B. Stroke C. Heart disease D. Atherosclerosis
Answer:
B. Stroke
Explanation:
Atherosclerosis refers to the formation of cholesterol-rich plaques in the inner lining of arteries. Atherosclerosis in cerebral arteries which function to provide oxygenated blood to brain cells leads to abrupt destruction of brain cells. Death of brain cells occurs due to oxygen deprivation. It is called a stroke or brain attack or cerebrovascular attack. Stroke poses a risk of developing higher blood pressure.
Whereas some modern whales possess a small and useless __________ pelvis
Answer:
vestigial is the answer
Your ability to drive safely can be impaired by use of certain over-the-counter drugs true or false
Answer: it's True
Explanation:
Medication that are used to treat allergies or colds can cause drowsiness which can cause you to feel sleepy while driving.
Medication used for diets or supplements could also cause excitability and can make you hyperactive while driving.
The angular difference between true north and magnetic north is called .
Answer:
Magnetic Variation/ Declination I believe.
The angular difference between true north and magnetic north is called declination.
What is declination?
The declination would be the angle that separates magnetic north from true north.
What is magnetic north?When a compass needle coincides well alongside Earth's magnetic field, it indicates the direction known as "magnetic north."
Therefore, the angular difference between true north and magnetic north is called declination.
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Wash hands for at least _____ in warm, soapy water before starting any food preparation.
Answer:
15-20 seconds
Explanation:
How would homeostasis be affected if there was a problem relaying information from the spinal cord to the brain?
Homeostasis is known as balance, so there wouldn’t be much balance in the body if their was an issue with those two. It could be nerve damage which might result in a loss of touch, or even trouble with day to day functions such as sitting or even walking. A spinal cord injury can cause progressive loss of brain cells in key areas of the brain.
Final answer:
A problem with information relay from the spinal cord to the brain would impair sensory perception and disrupt homeostasis, affecting the body's ability to adjust to changes and respond to stimuli such as pain or temperature, potentially leading to severe health issues.
Explanation:
Homeostasis is the process by which the body maintains a stable internal environment despite external changes. This stability is crucial for the body's functions and involves various systems including the nervous and endocrine systems for rapid and precise communication. The spinal cord plays a pivotal role in transmitting sensory information from the body to the brain and motor commands from the brain to the body, as well as controlling motor reflexes. If there was a problem relaying information from the spinal cord to the brain, it would impair the transmission of sensory information from receptors to the central nervous system. As a result, perception of stimuli in the brain would be halted or distorted. This disruption can affect the steps of sensory perception, potentially causing inaccurate or missed signals about changes that require adjustments for homeostasis, such as oxygen needs or carbon dioxide buildup in cells.
In addition to perception issues, the body's ability to respond to pain or temperature changes through reflex actions could be compromised. Reflex arcs, which often involve only the spinal cord for rapid response, would be affected, leading to delayed or absent reflex actions. These functions are essential for immediate reactions to harmful stimuli, contributing to the body's overall well-being and homeostatic balance. Lastly, serious health issues can arise from damage to the spinal cord, including paralysis, where the brain's ability to communicate with the body is severely impaired, demonstrating the critical role of the spinal cord in maintaining homeostasis.
What type of biological molecule is dna helicase?
Answer:
emzymes which is one of the biological catalysts
DNA helicase is an enzyme that separates the two DNA strands of a double helix during DNA replication. It untwists and separates these strands, resolving the supercoiling in the DNA and making it accessible for further replication. If helicase is mutated, this crucial separation wouldn't occur.
Explanation:DNA helicase is a type of biological molecule that is classified as an enzyme. Its primary function is to separate the two DNA strands of a double helix during the process of DNA replication. As the replication process initiates, special enzymes like helicase untwist and separate these two strands.
This process is often compared to unzipping a zipper. The action of helicase enzyme resolves the over-winding or supercoiling in the DNA ahead of the replication fork, a phenomenon caused by the opening of the double helix. This makes the single-stranded DNA template accessible to the DNA polymerase for the formation of a daughter strand. If helicase were to be mutated, the DNA strands wouldn't be separated at the beginning of replication.
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Mr. Smith has found a lump under his arm. He goes to his doctor, and the doctor confirms that the lump is cancer. How are cancerous cells different from normal cells?
--
A.
carcinogens change cancer cells to normal cells
B.
cancer cells are found in the lymph; normal cells are not
C.
the growth-regulating genes of cancer cells have mutated
D.
cancer cells occur in adults but not in children
Cancerous cells different from normal cells as the growth-regulating genes of cancer cells have mutated that is present in the option c as cancer cells are different from normal cells in various ways, such as having an abnormal number of chromosomes etc.
What is cancer cells?Cancer cells are cells that have undergone genetic mutations that cause them to divide and grow uncontrollably, and these cells can form tumors, invade nearby tissues, and spread to other parts of the body, a process known as metastasis. The uncontrolled growth of cancer cells is due to damage or mutations to genes that regulate cell growth and division. Cancer cells can also differ from normal cells in other ways such as cancer cells may have abnormal chromosomes, which can cause further mutations and contribute to the growth and spread of the cancer. Cancer cells may also be able to avoid the body's immune system, allowing them to grow and spread without being detected or attacked by the immune system.
Hence, Cancerous cells different from normal cells as the growth-regulating genes of cancer cells have mutated that is present in the option c
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Cancer cells differ from normal cells because of mutations in their growth-regulating genes. Thus, the correct answer is C. The growth-regulating genes of cancer cells have mutated.
Cancer cells differ from normal cells primarily due to mutations in their growth-regulating genes.These mutations disrupt the normal mechanisms that control cell growth and division.As a result, cancer cells can proliferate uncontrollably, forming tumors and invading surrounding tissues.These genetic alterations enable cancer cells to evade normal regulatory signals and resist cell death mechanisms.The accumulation of these mutations leads to the characteristic features of cancer, including uncontrolled growth, invasion, and metastasis.Therefore, the correct answer is C. The growth-regulating genes of cancer cells have mutated.
In cows, long hair is dominant to short hair. in a cow that is heterozygous for long hair, what percentage of the cells undergoing meiosis will carry the dominant allele?
In a heterozygous individual, the cells which undergo meiosis will carry the dominant allele (long hair) in 50% of the resulting gametes. This is because meiosis results in gametes that each contain one copy of either the dominant or the recessive allele.
Explanation:In cows, long hair is dominant to short hair, meaning that it masks the presence of the short hair allele when they are present together in a heterozygous individual. If a cow is heterozygous for long hair, this means it has one dominant allele (long hair) and one recessive allele (short hair). In meiosis, the cells split to form gametes (sex cells), and each gamete will carry one allele from the pair. This means that, in a cow that is heterozygous for long hair, 50% of the cells will carry the dominant allele (long hair), and 50% will carry the recessive allele (short hair).
Using the concept of a test cross, as developed by Mendel, this can be determined by crossing the heterozygous individual with a homozygous recessive one. If the dominant-expressing organism is a heterozygote, the F₁ offspring will exhibit a 1:1 ratio of heterozygotes and recessive homozygotes, validating Mendel's postulate that pairs of unit factors segregate equally.
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Final answer:
In a heterozygous cow with one dominant allele for long hair, 50% of the cells undergoing meiosis will carry the dominant allele.
Explanation:
In a cow that is heterozygous for long hair, where long hair is the dominant trait, every cell undergoing meiosis will have one dominant allele and one recessive allele for hair length. During meiosis, chromosomes and their alleles are divided into gametes (egg or sperm cells), each receiving one from each pair. Therefore, 50% of the gametes will carry the dominant allele for long hair because the heterozygous parent has one dominant allele and one recessive allele. This can be represented with the letters L for the dominant long hair allele and l for the recessive short hair allele. Thus, the genotype of the heterozygous cow is Ll, leading to 50% of its gametes carrying the L allele after meiosis.
Airplanes reach cruising altitudes at the lower part of the Earth's stratosphere. This portion of the atmosphere is made up mostly of and ?
Answer:
The stratosphere is a layer of Earth's atmosphere. ... The troposphere, the lowest layer, is right below the stratosphere. ... Because of this, jet aircraft and weather balloons reach their maximum operational altitudes within the stratosphere. ... from the bottom of the stratosphere up to altitudes of 40 or 50 km (25 to 31 miles).
Explanation:
Answer:
nitrogen and oxygen are found in the Earth's stratosphere, which is the second-lowest layer of the atmosphere. These are the two most common gases throughout the whole atmosphere.
Explanation:
The tough superficial layer of the epidermis is known as the stratum
A) corneum.
B) lucidum.
C) basale.
D) granulosum.
E) spinosum.
Answer:
Stratum corneum
Explanation:
Epidermis is known to be the outmost layer of the skin and it is made up of stratified squamous epithelium and keratinized. Thus, stratum corneum is known to be the layer of the epidermis that is most superficial and that can be seen with our eyes. Furthermore, stratum corneum functions by preventing the dehydration of underlying tissues and microbes penetration
Besides distributing food, what is another role of the un's food for girls' education programme?
The answer is C: encouraging women’s education
Answer:
Encouraging women’s education
Explanation:
The un's food for girls program is an initiative that seeks to contribute to the education of girls in countries where girls do not have the opportunity to receive appropriate education.
In some countries, people believe that women should not study but rather help with household chores. they believe that only men can receive education since it is they who must work and provide for the family. For this reason, the rate of illiteracy among women is very high.
Thus, the un's food for girls proposes to encourage girls' education by donating food for families to send their girls to school so that they can have access to education.
Which of the pathways for nucleotide biosynthesis builds the base ring on a PRPP molecule?
A) purine B) pyrimidine C) both purine and pyrimidine
Answer:
A) purine
Explanation:
There are two ways for the synthesis of purines and pyrimidines:
de novo synthesis-from basic simple units"recycling" synthesis-reuse of metabolitesPurines are synthesized directly on ribose sugar, in segments.
Pyrimidines are attached to the ribose after the synthesis of the base.
5-Phosphoribosyl-1-pyrophosphate (PRPP). is used for the synthesis of purine (ribose 5-phosphate reacts with ATP to form ribonucleotide).
How many complete molecules of dna do you begin with in dna replication?
Answer:
Well you began with 2 DNA replication
Explanation:
All living organisms on earth grow, maintain homeostasis, and undergo cell division. Prior to cell division, cells must undergo DNA synthesis to ensure an accurate copy of DNA is distributed to each daughter cells. DNA replication is similar in nearly all cells across all three domains, indicating that life on earth likely shares a common ancestry. Which part of the model of the cell cycle provides this shared feature of life on earth, DNA synthesis?
D) S is the answer to the question
Answer:
The correct answer will be- S phase or synthesis phase.
Explanation:
The cell cycle is the ordered series of events which explains the distribution of the nucleus and the cytoplasm of the cell.
The cell cycle takes place in two phases: M-phase and interphase. The interphase is divided into three stages: G₁, S and G₂ phase.
The phase involved with the replication of the DNA is known as the S phase or synthesis phase. It is the S phase which is highly conserved among all the domains of the classification system and thus, S phase is the correct answer.
Genetic drift is more pronounced in the island population than in the mainland population in these first few generations. true or false
Answer:
false
Explanation:
island populations are isolated therefore it would be harder for population drift
Where does most of the water from ingested food get absorbed back into the bloodstream?
Absorption. Digested food molecules are absorbed in the small intestine . This means that they pass through the wall of the small intestine and into our bloodstream.
The majority of water from ingested food is absorbed back into the bloodstream in the small intestine, where it is integrated with other nutrients to hydrate and nourish our bodies.
Explanation:Most of the water from ingested food is absorbed back into the bloodstream in the small intestine. After the process of digestion, water molecules, along with nutrients, are absorbed through the walls of the small intestine into the bloodstream. The small intestine is a part of our digestive system that has a large surface area due to villi and microvilli that greatly increase the absorption of water and nutrients to assist in our body's hydration and nutritional needs.
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Name several organs that belong to the digestive system of the perch
Answer:
small intestine
large intestine
stomach
kidneys
Name the type of element that has luster, conducts electricity and is malleable
Answer: Metal
Explanation :Metals are often shiny (luster) , malleable, ductile, and can conduct electricity.
Hope this helps.
Based on the soil texture diagram, what type of soil is 40 percent sand, 15 percent clay, and 45 percent silt? A. Loam B. Sandy loam C. Sandy clay loam D. Silt loam
The answer is A.) Loam.
I'm just asking/answering my own question to help people out!!
Answer:
Okay then, so the answer to this question is A) loam
Comments:
Thanks!
Sand, silt, and clay combine to make loam. Loam soil should have equal amounts of all three soil types.. Therefore option (A) is correct.
What is loam soil?Loam, A friable (crumbly) soil that is rich in nutrients and contains roughly equal percentages of sand and silt, with somewhat less clay. It is possible to use the term in a less specific sense to refer to dirt or soil in general at times. Leaching, also known as percolation, transfers minerals and clay from the topsoil above into the subsurface, where they are incorporated into the loam.
Clay, silt, and silty clay loam are examples. Different soil stages vary in stoniness and erosion, which don't effect native vegetation but can affect crop production.
Most garden plants prefer loamy soil because it absorbs moisture and drains well so roots can get enough air.
Therefore, option (A) is correct.
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Which climate is found closer to the equator? Tropical rain forests tropical savannas humid subtropics
Answer:
Tropical Rain Forests
Explanation:
What is an example of a genetic disorder caused by a substitution mutation?
Answer:
An example of a genetic disorder caused by a substitution mutation is sickle-cell disease. Hope this helps.
Final answer:
Sickle-cell disease is a genetic disorder caused by a substitution mutation where glutamic acid is replaced by valine in the hemoglobin gene, leading to abnormally shaped red blood cells.
Explanation:
An example of a genetic disorder caused by a substitution mutation is sickle-cell disease. This condition occurs due to a substitution of one nucleotide for another in the hemoglobin gene, which leads to the replacement of the amino acid glutamic acid with valine in the hemoglobin protein. As a result, red blood cells take on a sickle shape, which can lead to various health complications, including pain, infections, and anemia.