a city was intensively sprayed with a pesticide called ddt to control houseflies. the number of houseflies was immediately greatly reduced. each year thereafter, the city was sprayed again, but the flies gradually increased in numbers until 10 years later, when they were almost as abundant as they were when the control program began. which explanation applies to this situation?
Answers
The DDT largely eliminated house flies. Only a few individuals who had this resistance naturally lived and passed it on to their descendants.
Are pesticides dangerous to people?Acute impacts, often known as short-term negative health effects as well as typically limited, which can develop months or even years after exposure, are both possible with pesticides. Eyes that sting, blisters, rashes, blindness, nausea, lightheadedness, diarrhea, and even death are instances of acute health impacts.
What components make up pesticide?They can be produced from organic materials like pyrethrin, a pesticide that is derived from specific chrysanthemum plants. Azadirachtin, a neem tree extract, is another illustration. Synthetic pesticides like pyrethroids, which control bugs similarly to pyrethrins, can also be produced.
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Related Questions
A species of asexually reproducing bacteria can have new offspring in 40 minutes, and a species of sexually reproducing salamanders can have new offspring in 48 months.
Which statement best describes this situation?
This is a disadvantage for both species.
This is a disadvantage for the bacteria and an advantage for the salamanders.
This is an advantage for the bacteria and a disadvantage for the salamanders.
This is an advantage for both species.
Answers
Answer:
It's an advantage for the bacteria, not an advantage for the salamander
Explanation:
The point of reproduction ideally is to produce as many offspring in as little time as possible, to increase the number of offspring that thrive. Therefore the bacteria being able to multiply quickly is an advantage and will most likely increase the chances of evolution occuring sooner (antibiotic resistant bacteria for example). The salamander having to wait 4 years to have few offspring will make the number of babies they're able to have in a lifetime rather low.
This is an advantage for the bacteria and a disadvantage for the salamanders. So, the correct option is (C).
What is Asexual reproduction?Asexual reproduction is defined as a mode of reproduction in which a new offspring is produced by a single parent where the new individuals produced are genetically and physically identical to each other i.e. they are clones of their parents.
Asexual reproduction is observed in both multicellular and unicellular organisms where the process does not involve any kind of gamete fusion and there is no change in the number of chromosomes. It will inherit the same genes as the parent, except in some cases where a rare mutation is likely to occur.
Through this method, organisms reproduce quickly while through sexual reproduction, organism take time which is a disadvantage.
Thus, this is an advantage for the bacteria and a disadvantage for the salamanders. So, the correct option is (C).
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A scientist is comparing the outer layer of an onion cell to the outer layer of a human skin cell. What is unique about the outer layer of the onion cell compared to the skin cell?A scientist is comparing the outer layer of an onion cell to the outer layer of a human skin cell. What is unique about the outer layer of the onion cell compared to the skin cell?
Answers
An onion cell's outer layer and the outer layer of a human skin cell are being contrasted by a scientist. It has cellulose in it which distinguishes the onion cell's outer layer from the skin cell.
What is the outer layer of an onion cell?A plant cell called an onion cell has a cell wall and a large vacuole. The human cheek cell, on the other hand, is an animal cell with a large nucleus.
Human cheek cells are spherical, whereas onion cells have a brick-like form. Both a cell wall and a sizable vacuole are absent from human cheek cells.
Therefore, cellulose is unique in the outer layer of the onion cell.
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Where does a sea star embryo get its nutrition during prelarval stages of development?
Answers
During the prelarval stages of development, a sea star embryo obtains its nutrition from the yolk that is present within the egg. The yolk serves as a source of nutrients for the developing embryo.
As the embryo develops, it utilizes the stored energy and nutrients from the yolk to support its growth and development.
Sea stars, like many other marine organisms, undergo external fertilization, where the eggs and sperm are released into the water. After fertilization, the zygote develops into an embryo within the protective egg capsule.
The yolk, which is rich in proteins, lipids, and carbohydrates, is present within the egg and provides nourishment to the developing embryo.
As the prelarval stages progress, the embryo undergoes cell division and differentiation, eventually developing into a free-swimming larva. At this stage, the larva will start to feed on external food sources, such as plankton or other microscopic organisms, to sustain its growth and development.
But during the early prelarval stages, the yolk serves as the primary source of nutrition for the sea star embryo.
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A fingerprint is visualized on a soda can using superglue. What type of fingerprint is this?
A) bifurcation
B) latent
C) patent
D) plastic
Answers
Fingerprints in modern times are now used in detecting criminals from crime scenes. Fingerprints derived from these crime scenes can be obtained and visualized.
The type of fingerprint this is is a latent fingerprint.
Latent fingerprints can also be referred to as invisible type of fingerprints.To enable their use, they must be visualized through the use of various techniques which include dusting/iodine/super glue. Latent fingerprints are the most common type of fingerprints usually found at a crime scene. They are also much harder to detect and lift than any other type of fingerprints.Learn more about fingerprints: https://brainly.com/question/2114460
The active period of the cell cycle, during which a cell grows, DNA replicates, and new organelles form, is called ___________. It terminates when the cell begins mitosis.
Answers
The active period of the cell cycle, during which a cell grows, DNA replicates, and new organelles form, is called the interphase.
Interphase is the longest phase of the cell cycle and is divided into three subphases: G1 (gap phase 1), S (synthesis phase), and G2 (gap phase 2). During G1, the cell grows, carries out its normal functions, and prepares for DNA replication.
In the S phase, DNA replication occurs, resulting in the duplication of the cell's genetic material.
In G2, the cell continues to grow and prepares for cell division. The interphase terminates when the cell enters mitosis, the process of cell division.
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In 1966, Dr Lynn Margulis formulated the endosymbiotic theory, which examines the cooperative existence of multiple prokaryotic organisms. What is the significance of such interdependence? (15.8) Inildin It provides insight into the now well understood interdependence in food chains and webs It shows that the first prokaryotic organisms lived in large communities It explains how organelles and eventually eukaryotic cells could have arisen It proves that different prokaryotic organisms mated to produce eukaryotic organisms
Answers
Answer:
It explains how organelles and eventually eukaryotic cells could have arisen
Explanation:
Enzymes chemical reactions.
Answers
Explanation:
Enzymes are proteins that act as catalysts in chemical reactions. They speed up the rate at which a reaction occurs, but are not consumed in the reaction. Enzymes bind to the substrate molecules of a reaction, lowering the activation energy needed to start the reaction. This allows the reaction to occur more quickly and efficiently.
chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells the half-life of chromium-51 is 27.7 days. how much time is required for the activity of a sample of chromium-51 to fall to 26.6 percent of its original value?
Answers
is 27.7 days for chromium-51.Phosphorus-32 is among the radioactive isotopes that is utilized in medical diagnosis or therapy.Phosphorus-32 has a half-life of 14 days.
Where does chromium-51 come from?In a reactor, neutron activation generates Cr.It has a radioactive ½ of 27.7 days and decays by electron capture.At 320 keV, just a little bit above the ideal detection range of conventional gamma counters, the primary gamma-photon emission is produced by electron capture.
What makes chromium 51 significant?Red blood cells are labeled with chromium 51 to measure their mass or volume, conduct survival rates and sequestration experiments, and diagnose gastrointestinal bleeding.Additionally, platelets are labeled with chromium 51 to analyze their functions.
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Which describes a characteristic shared by plant-like, and fungus-like protists
Answers
Sunlight is absorbed by the leaves. What two substances are also taken in by the plant for photosynthesis to occur?
Answers
Answer: Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel.
If a branch bearing sweet seedless oranges is grafted to a branch of an orange tree bearing sour seeded oranges, what type of oranges will the grafted branch produce?
Is this an example of natural or artificial vegetative propagation? (Explain)
Answers
Answer:
i would say natural because the branches grafted together they weren't made to go together by a human
Explanation:
cells of the indicated endocrine gland secrete hormones that decrease blood calcium levels? a. a b. b c. c d. d e. e
Answers
The cells of the indicated endocrine gland secrete hormones that decrease blood calcium levels as calcitonin.
In the Attachment, calcitonin is shown in figure B.
Cаlcitonin, аlso cаlled thyrocаlcitonin, is а hormone thаt plаys а role in regulаting the level of cаlcium in the blood by decreаsing it. Cаlcitonin is mаde by your thyroid glаnd, а smаll, butterfly-shаped glаnd locаted neаr the throаt.
Cаlcitonin is secreted by the pаrаfolliculаr cells of the thyroid glаnd. This hormone opposes the аction of the pаrаthyroid glаnds by reducing the cаlcium level in the blood. If blood cаlcium becomes too high, cаlcitonin is secreted until cаlcium ion levels decreаse to normаl.
Your question is incomplete, but most probably your figure can be seen in the Attachment
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39. The process by which light is trapped and converted to chemical energy iscalledA. cellular respiration.B. photosynthesis.C. the Calvin cycle.
Answers
Photosynthesis is the process by which plants trap light energy through their pigments and together with carbon dioxide and water generate a carbohydrate (chemical energy).
That is, photosynthesis is the process in which light energy is converted into chemical energy in the form of sugars.
we can conclude that the correct answer is:
Answer:B. photosynthesis.
If a cell's organelle worked in an actual human factory and had the role of the electric generator, which organelle would it be?
Answers
Answer: mitochondria
Explanation:
An electric generator produces energy to do work. A mitochondria produces ATP to power the cell.
Which elements make up the the following compounds?
1. Salt
2. Baking Soda
3. Water
4. Hydrogen Peroxide
Answers
Answer:
The element of salt is sodium. The elements of baking soda also called sodium bicarbonate are carbon,sodium,hydrogen and oxygen. The element of water is hydrogen and oxygen. The elements of hydrogen peroxide are hydrogen and oxygen same as water. Hope this helped!!
Explanation:
I am an A+ student in chemistry. So i know its right ;)
What does the term organelle mean, literally?
Answers
Answer:
it literally means :
any of a number of organized or specialized structures within a living cell.
Explanation:
GOo-GlE said so
what type of protein binds to silencers to prevent gene expression from occurring? what type of protein binds to silencers to prevent gene expression from occurring? repressors promoters enhancers rna polymerase
Answers
Answer: repressors
Explanation:
One similarity and one difference between hydrolysis and carbonation.
Answers
One similarity between hydrolysis and carbonation is that they are both chemical reactions that involve the addition of water to a compound.
One difference between hydrolysis and carbonation is that hydrolysis involves the breakdown of a compound into smaller molecules through the addition of a water molecule, whereas carbonation involves the addition of carbon dioxide to a compound. Hydrolysis is a chemical reaction that occurs when a compound reacts with water, whereas carbonation is a chemical reaction that occurs when a compound reacts with carbon dioxide.
Embryonic stem cells give rise to all cell types in the developing embryo. would you expect the interphase period of a stem cell to longer, shorter, or the same as compared to non-stem cells?
Answers
The interphase in embryonic stem cells is shorter as they are rapidly dividing.
Pluripotent stem cells, called embryonic stem cells (ESCs), are generated from the inner cell mass of the blastocyst, an early-stage preimplantation embryo. Four to five days after fertilization, the human embryo reaches the blastocyst stage, which consists of 50-150 cells. The blastocyst is destroyed when the inner cell mass (germinal cells) are separated by immuno surgery, raising moral questions as to whether the pre-implantation embryo follows the same moral standards as the post-implantation development. Similar to adult stem cells, these are stem cells supplied by a healthy, fully developed human being. They were not collected or implanted using embryos or fetuses. Scientists believe that stem cells can be used to treat and understand disease because they can differentiate into different cell types.Therefore, embryonic stem cells will have shorter interphase.
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If the sperm cell of an organism contains 14 chromosomes, how many chromosomes are in an autosomal cell of this organism.
Answers
If a sperm cell of an organism contains 14 chromosomes, the number of chromosomes in an autosomal cell of this organism is 28.
How so many clones would a 14-chromosome cell produce?Mitosis is a kind of cell division that produces two daughter cells with the same number of chromosomes as the parent cell.The two daughter cells will have 14 chromosome each if the mother cell had 14 chromosomes.
How many chromosome 14 copies are there?Humans typically have two copies of their 46 chromosomes, which are split into 23 pairs.One of the pairings is made up of two copies of chromosomes 14, one from each parent.
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Which Texas ecoregion experiences that largest change in temperature in
а a day?
HELP AGAIN PLEASE
Answers
Answer:
Texas Panhandle
Explanation:
The area borders the state of Oklahoma in the state of Texas. This is a very hot area and to make things worse, it is full of dirt, which means it is very dry. Although the average high temperature in the area was 70 degrees, from 2010 to 2012, Pandelle reached a hot temperature of 95 degrees. These temperatures are one of the hottest in the United States.n addition to testing shmoo formation in the two mutant strains of yeast, the scientists also tested shmoo formation in wild-type yeast. what is the purpose of including wild-type yeast cells in the experiment? in addition to testing shmoo formation in the two mutant strains of yeast, the scientists also tested shmoo formation in wild-type yeast.what is the purpose of including wild-type yeast cells in the experiment? to show normal shmoo formation under the experimental conditions to show what happens to shmoo formation when both fus3 kinase and formin are absent to allow the scientists to see the interaction between fus3 kinase and formin to show the difference between symmetrical and asymmetrical growth
Answers
The purpose of including wild-type yeast cells in the experiment is option B and D: to show normal shmoo formation under the experimental conditions and to show the difference between symmetrical and asymmetrical growth.
To demonstrate typical shmoo development under the experimental conditions, wild-type yeast cells are included in the experiment. To demonstrate the distinction between symmetrical and asymmetrical growth, the researchers also examined shmoo production in wild-type yeast.
Shmoo development is an alteration of morphology that results in the cell having a mating projection. It is created by cells of Saccharomyces and other fungus with similar life cycles in response to mating pheromone. A mutant strain of yeast is one that has undergone a genetic mutation that modifies its phenotypic. Mutations can happen naturally or be brought on by mutagens like radiation or chemicals.
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Correct question is:
In addition to testing shmoo formation in the two mutant strains of yeast, the scientists also tested shmoo formation in wild-type yeast. what is the purpose of including wild-type yeast cells in the experiment?
to show normal shmoo formation under the experimental conditions
to show what happens to shmoo formation when both fus3 kinase and formin are absent
to allow the scientists to see the interaction between fus3 kinase and formin
to show the difference between symmetrical and asymmetrical growth
Are these two substances the same ? Explain why they are or are not .
Answers
Answer:
They are the not the same exact thing because they are both pawter both marked as yellow but there not the same yellow and marks they are Conductivity but in order of it to be the same it has to have everything the same and the melting temperatures are different and different Density
How do the cells produced by meiosis
compare to each other?
A. Two of them are identical to each other.
B. They are all identical.
C. All four are genetically different.
Answers
In meiosis all four are genetically different. So, the correct answer is option (C) All four are genetically different.
Meiosis is the form of cellular department that creates egg and sperm cells. Mitosis is a fundamental system for existence. in the course of mitosis, a mobile duplicates all of its contents, such as its chromosomes, and splits to form two identical daughter cells.
Meiosis is a type of mobile department that reduces the wide variety of chromosomes within the discern cell by means of half and produces four gamete cells. This procedure is required to provide egg and sperm cells for sexual reproduction.
Meiosis takes place inside the primordial germ cells, cells exact for sexual duplicate and break free the frame's ordinary somatic cells. In instruction for meiosis, a germ cellular is going through interphase, in the course of which the complete cellular undergoes replication.
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Historically, the _________ was seen as the dominant __________ of the brain. a. left hemisphere . . . hemisphere b. right hemisphere . . . hemisphere c. occipital lobe . . . lobe d. parietal lobe . . . lobe please select the best answer from the choices provided a b c d
Answers
Historically, the left hemisphere was seen as the dominant hemisphere of the brain.
So the correct option is (a).
What is brain?The brain regulates the entire body, making it the major organ of the body. It is an organ with the shape of a walnut that is split into the left and right hemispheres. It can be found in the head.
The two hemispheres serve distinct purposes. Through the corpus callosum, the left and right hemispheres are linked to one another, and a lengthy fissure separates them.
Right brain, left body: The left side of the brain governs the right side of the body, and vice versa. The right side processes images, while the left is in charge of thought.
Hence, the correct option is (a). left hemisphere . . . hemisphere
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1. This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. Select the correct statement.
A. A phylogenetic tree containing two main branches for evolutionary relationships among the animals.
B. The first branch leads to Drosophila.
C. The second branch divides into two branches, 2a and 2b. Branch 2a leads to Lancelet.
D. Branch 2b divides into two branches: 3a and 3b. Branch 3a leads to Zebrafish.
E. Branch 3b divides into two branches: 4a and 4b. Branch 4a leads to Frog.
F. Branch 4b divides into two branches: 5a and 5b. Branch 5a leads to Chicken.
G. Branch 5b divides into two branches leading to Human and Mouse, respectively.
2. This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. Select the correct statement.
A. The common ancestor of a human and a frog and the common ancestor of a mouse and a chicken lived at the same time.
B. The nucleotide sequence of this gene in a mouse is more similar to the sequence in a chicken, and both are less similar to the nucleotide sequence of this gene in a frog.
C. A frog is the ancestor of both a mouse and a chicken.
Answers
The figure shows a tree diagram with two main branches. The first branch leads to Drosophila. The second branch divides into two branches 3a and 3b. Branch 3a leads to Lancelet. Branch 3b divides into two branches: 4a and 4b. Branch 4a leads to Zebrafish. Branch 4b divides into two branches: 5a and 5b. Branch 5a leads to Frog. Branch 5b divides into two branches: 6a and 6b. Branch 6a leads to Chicken. Branch 6b divides into two branches leading to Human and Mouse, respectively.
This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. Select the correct statement.
The nucleotide sequence of this gene in a mouse is more similar to the sequence in a chicken, and both are less similar to the nucleotide sequence of this gene in a frog.
A frog is the ancestor of both a mouse and a chicken.
The common ancestor of a human and a frog and the common ancestor of a mouse and a chicken lived at the same time.
Answer:
The answer is below
Explanation:
Given the information above, and from the available pictures which showed the detailed analysis of the information presented in the question. It can be concluded that, the nucleotide sequence of this gene in a mouse is more similar to the sequence in a chicken, and both are less similar to the nucleotide sequence of this gene in a frog.
Hence, the right answer is option B.
what organalls contains its own dna
Answers
Name the symbolic relationship in which one organism benefits and the other is unaffected.
Answers
Commensalism is the term for a symbiotic connection in which one species benefits while the other remains unharmed.
What is a commensalism relationship?
A connection among creatures called commensalism occurs when one species advantages while the other remains undisturbed. A range of commensal microorganisms that live in animals' tissues but are not harmful to them is necessary for their existence.The commensal, or individual that gains from the connection, could take resources from the host organism, which is generally unharmed or get refuge from it, sustain it, or use it for movement. A bigger host and a smaller commensal are frequently in a commensal relationship; the host species remains unaltered, whilst the commensal individual could exhibit substantial design adaptations commensurate with its lifestyle, as in the case of remoras that travel connected to shark species as well as other fishes. Pilot fish eat the leftovers from their hosts' meals, but remoras consume their hosts' feces. Many birds perch atop the bodies of big herbivorous animals or eat upon the insects that grazing animals kick up.Learn more about commensalism here:
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Place the levels of organization within the biosphere in order of increasing complexity (least complex at the top , most complex at the bottom) .
WILL GIVE SOMEONE who gives the answers correct brainlist . Help please !
Answers
Answer:
Biosphere, Biome, Ecosystem, Biological Community, Population, Organism, Organ, and Cell.
Explanation: Hope this Helped! :)
The levels of organization within the biosphere in order of increasing complexity are as follows:
Organism < Population < Biological community < Ecosystem < Biome < Biosphere. What are the levels of organization in living animals?The levels of organization in living organisms can be initiated with the cell. This is because a cell is the basic structural and functional unit of life. And all organisms are composed of cells.
The cluster of cells togetherly forms tissue in order to play the same function. The arrangement of tissues gives rise to organs. Organs make the organ system which finally gives rise to the complete organism.
The collection of organisms of the same species is known as the population. The Population is known as the unit of evolution. Population forms a biological community, which then assembles to form an ecosystem.
Therefore, the levels of organization within the biosphere in order of increasing complexity are mentioned appropriately.
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The highest level of organization in an organism is
Answers
Answer: The biosphere
Explanation:
Answer:
Biosphere
Explanation:
because it encompasses all the other levels and also the biological levels of organisation of living things . Hope it is helpful and have a good luck