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Fudgin [204]
3 years ago
12

Why do you think scientists need to identify something as a pure substance?

Biology
2 answers:
vesna_86 [32]3 years ago
7 0
Scientists need to identify something as a pure substance in order to keep track of what’s safe and what’s not.
Alisiya [41]3 years ago
4 0

Answer:

because,

if somethinggoes wrong it can be dangerous to all

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Which of the following does not represent a common outcome following introduction of foreign DNA into a bacterial cell?Choose on
AleksandrR [38]

Answer:

The correct option is A, since if the DNA enters in a circular form it is called a plasmid, and the plasmids upon entering the bacteria self-replicate outside the genetic structure, which gives the bacteria better survival qualities.

Explanation:

Plasmids are generally circular extrachromosomal DNA molecules that replicate and transmit independently of chromosomal DNA, and are normally present in bacteria, archaea, and sometimes in eukaryotic organisms such as yeast. Its size varies from 3 to 10 kb. The number of plasmids can vary, depending on their type, from a single copy to a few hundred per cell. Plasmid vectors allow cloning of exogenous DNA ligands of up to 4 kb since a larger size than this makes cloning in these vectors difficult. The term plasmid was first introduced by the American molecular biologist Joshua Lederberg in 1952. Plasmids can only coexist as one or more copies in each bacterium, due to cell division they can be lost in one of the secreted bacteria.

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3 years ago
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pickupchik [31]

Answer:

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2. Low pressure: Happens when warm air rises...

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5. Sun: Is necessary for evaporation to take place.

6. Nimbus clouds: Dark clouds that have rain or snow falling.

7. Cumulus clouds: Fluffy, dense clouds most composed of droplets.

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9. Nitrogen: Makes up 78% of Earth's atmosphere.

10. Troposphere: Lowest layer of Earth's atmosphere. Where we live. Where we find most weather.

-Hope this helps.

7 0
3 years ago
Read 2 more answers
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Aleks04 [339]

Answer:

These facts are true and disturbing

Explanation:

Genetics is a discipline that has advanced incredibly in the last years. For example, by using the versatile CRISPR-Cas9 genome editing system, we are now able to insert literally any sequence into a given genome in vivo. The CRISPR-Cas9 is a technology that can be used in a regular molecular biology laboratory. It is expected this technique will enable in the near future to correct genetic disorders that have plagued mankind since times immemorial. However, genomic technologies like that could be used by malignant persons to hurt innocent people, thereby it is imperative that countries regulate their use.

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Answer to this is copper wire 
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Why do microorganisms differ in their response to disinfectants?
andre [41]
<span>microorganisms of different grous are not uniformly susceptible to chemical disinfection due to the level of resistance of the BACTERIA</span>
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