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Bas_tet [7]
3 years ago
8

What part of the scientific method is this: Because human subjects are difficult to study, laboratory rats were used. One group

of laboratory rats was given the artificial sweetener, and another group was not. All of the rats were given an identical diet and living conditions.
Biology
1 answer:
astra-53 [7]3 years ago
4 0
Its the experiment part where you test the hypothesis
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DDT (dichlorodiphenyltrichloroethane) was used as an insecticide which is a substance used to kill insects. That resulted in decrease in insect and pest populations. It is a persistent and non-degradable insecticide, but as well organic pollutant readily accumulated to soils and consequently affects organisms.
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10. How can you prevent your slide from slipping on the stage?
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Explanation:

Use the stage clips.

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NEED HELP!!!!!!!!!!!!!!!!!!!!!!!!!
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Answer:

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3 years ago
Which of the following statements regarding the moon and Earth is correct?
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Answer:

A

Explanation:

It is believed that the moon was formed shortly (relative time) after the earth was newly formed. This occurred in a massive planet-sized collision that  ejected a huge chunk of the earth out into space. The chunk, still within earth gravitational reach, began orbiting the earth becoming the moon. Both earth and moon are slightly more than 4 billion years old.

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3 years ago
For each region of the lac operon on the F' plasmid, I+ P+ Oc Z− Y+ , determine whether the region is wild type (that is, it pro
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Answer:

A,B and E

Explanation:

  • I+: I refers to the lac repressor, the + indicates that the repressor is functional
  • P+:  P refers to the promoter region and the + indicates that the promoter is functional
  • Oc:  O refers to the operator region, but the Oc indicates that the operator is constitutive ie. that it is always on/ can't be turned off.
  • Z-: Z refers to the LacZ gene which produces β-galactosidase. Z- indicates that this gene is non-functional
  • Y+:  Y refers to the LacY gene which produces the permease protein. Y+ indicates that this gene is functional

So based on the breakdown above:

  • A is true because P+.
  • B is true because I+.
  • C is not true because the lac operon is an inducible system. The operator needs to be able to be repressed. In this case the operator is constitutive (always on)  which is not the correct form.
  • D is not true because Z-, no β-galactosidase is produced.
  • E is true because Y+.

Only A, B and E apply.

6 0
3 years ago
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