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Y_Kistochka [10]
3 years ago
6

The use of DDT as a pesticide is an example of how new technology can have favorable and dangerous long-term outcomes. How does

this relate to the use of DNA technology? Only positive outcomes can result from new technology in science. Scientists should conduct long-term studies of DNA technology to determine the consequences. There is no connection because they are different technologies. Scientists should not use new technology; they should use the methods for pest control that are already available.
Biology
2 answers:
kipiarov [429]3 years ago
4 0

The right answer is Scientists should conduct long-term studies of DNA technology to determine the consequences.

DDT is a potent insecticide: it kills by opening the sodium channels of insect neurons, destroying them instantly, leading to spasms and then death. Some genetic mutations acting on the sodium channels can make some insects resistant to DDT and other insecticides working on the same principle.

The US Environmental Protection Agency has categorized DDT into the B2 class, that is, potential carcinogen for humans. This supports the fact that the insecticide acts on human DNA.

Nadusha1986 [10]3 years ago
4 0

The correct statement is that scientists should conduct long-term studies of DNA technology to determine the outcomes.  

DDT refers to a potent insecticide, which kills by opening the sodium channels of insect's neurons, damaging them instantaneously, resulting in spasm and then death. The researchers should conduct the experiments to make sure that these pesticides will not harm other species, mainly at a molecular level, as this could influence the whole species of the organism.  

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Heterocyst-forming cyanobacteria differentiate highly specialized cells to provide fixed nitrogen to the vegetative cells in a filament. In the presence of a source of combined nitrogen such as nitrate or ammonium, Anabaena PCC 7120 grows as long filaments containing hundreds of photosynthetic vegetative cells.
3 0
3 years ago
Entre los siguientes métodos de separación de mezclas, Jorge debe seleccionar el adecuado para separar sal de una mezcla de sal
makvit [3.9K]

Teniendo en cuenta las definición de evaporación, la respuesta correcta es la primer opción: para separar la sal, Jorge debe usar la Evaporación, porque con este método se evapora el agua y queda únicamente la sal.

El método de separación utilizado para el agua y la sal es: la evaporación.

La evaporación consiste en pasar el soluto disuelto en un liquido a estado gaseoso y ocurre al aumentar su temperatura de forma natural o artificial,. Dependiendo de que se desea evaporar se utiliza el material correspondiente. La técnica mas común es por contacto y puede acelerarse si utilizamos un material conductor dentro del liquido.

En otras palabras, se conoce que la evaporación es el proceso por el cual las distintas moléculas en estado líquido, como lo es en agua, pasan a un estado gaseoso de manera espontánea, siendo este el principal efecto de la evaporación.

Como se mencionó el método de separación utilizado para el agua y la sal es la evaporación. Durante este proceso, al aplicar calor, el agua se convierte en vapor y se libera al aire. La sal, como tiene otro punto de ebullición, no se evapora.

Entonces, la respuesta correcta es la primer opción: para separar la sal, Jorge debe usar la Evaporación, porque con este método se evapora el agua y queda únicamente la sal.

Aprende más:

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7 0
3 years ago
An adequate consumption of fat during the toddler years is necessary for the development of which system?
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6 0
3 years ago
What is the Molecular mechanism of DNA replication?
kolezko [41]

Answer:

DNA replication a process of copying of a cell's DNA.  DNA replication is semiconservative process which means that each strand in the double helix helps in the synthesis of new, complementary strand and conserve the parent template.

The Molecular mechanism of DNA replication is as following:

  1. The double starnded DN in binded with hydrogen bond, the enzyme helicase opens up the DNA at the replication fork.
  2. A single stranded binding protein prevent the rewinding of DNA and so binds to the DNA around the replication fork
  3. Topoisomerase prevent supercoiling at replication fork.
  4. The ezymes primase come in action and produces RNA primers which are complementary to the DNA strand.
  5. DNA polymerase III help to extends the primers and allow them to add  to the 3' end, to make new DNA.
  6. DNA Polymerase then remove RNA primers and replace with DNA.
  7. DNA ligase blocks the the gaps between DNA fragments.

So, this is the molecuar mechanism of DNA replication.

7 0
3 years ago
Which mechanism do sponges possess that makes a predator think twice before attacking it?
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<span>Sponges possess the defense mechanism of releasing toxins that make a predator</span>
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