In a gene cloning experiment, why are white colonies desirable (rather than blue colonies)?

1 answer:

7 0

This is because the white colonies are the ones that have taken up the recombinant DNA, while the blue ones have not. This is called blue-white screening, a molecular cloning technique, and is conducted on X-gal medium and utilized selection using the beta-galactosidase gene.

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Which of the following statements about DNA is FALSE?

Gwar [14]

Answer:

A) The two strands of a DNA molecule are parallel and complementary.

Explanation:

DNA is a polymer of nucleotide and this nucleotide are made up of a deoxyribose sugar molecule, a nitrogenous base, and a phosphate group. In DNA genetic information of the cell is stored in the form of nitrogenous bases.

DNA is double-stranded and both the strands run anti-parallel with each other. This anti-parallel orientation provides the nitrogenous base of one strand to form hydrogen bonds with the nitrogenous base present on the opposite strand.

In DNA adenine base pairs with thymine with two hydrogen bonds and guanine base pairs with cytosine with three hydrogen bonds. So the false statement is A.

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4 years ago

Organisms with traits that are well-suited to an environment tend to survive and reproduce at a greater rate than organisms that

nata0808 [166]

I guess 'natural selection '

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3 years ago

Natural selection is the process by which favorable traits tend to increase in frequency over time.

Nana76 [90]

Answer: The statement is true

Explanation:

Natural selection, as its name implies refers to the choice of certain favorable traits such as resistance to diseases, bigger fruit size etc above lesser favorable traits such as easy susceptibility to diseases, small fruit size etc.

Hence, nature allows the traits that will help living organisms survive best in their environment to be passed down to new offsprings while it eliminates all other traits.

Thus, the statement is true

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4 years ago

Where is long-wavelength radiation created?

Ivahew [28]

On the earth surface

Explanation:

The long-wavelength radiation is created on the earth surface when electromagnetic radiation is re-emitted.

The sun releases radiation in form of short-wave.
They are usually more energetic and with short wavelength and a high frequency.
When they interact with materials on the earth, they are radiated back as long-wavelength radiation that usually causes heat.
Ultraviolet rays and other high energy waves are emitted from the sun because it is a very hot body.
When these radiations enters the earth, they are re-radiated back as long waves with lower energy.
Earth is cooler than the sun
When some of the short waves for example, the ultraviolet rays gets to the surface, it is absorbed and re-radiated back.
When the short waves are absorbed, they lose some of their their energy to the earth surface.
The remainder is radiated back as less energetic long waves.
The hotter a body is, the more energetic the radiation it releases.

learn more:

Electromagnetic radiation brainly.com/question/6818046

#learnwithBrainly

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3 years ago

Chloroplasts in the palisade mesophyll cell are in the

pashok25 [27]

Answer:

Option A

Explanation:

Chloroplasts are always located in the cytoplasm of the cell.

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3 years ago