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almond37 [142]
3 years ago
9

Which of the following is a correct statement?

Biology
1 answer:
Zepler [3.9K]3 years ago
7 0

Answer:

Option-B

Explanation:

The cDNA and genomic DNA are two types of DNA which are synthesized by humans in vectors for various purposes.

Complementary DNA is a DNA sequence obtained when the formed mRNA is reverse transcribed by the reverse transcriptase enzyme and results in the complementary DNA. The mRNA is derived from the specific cell in which the mRNA is expressed.

The genomic DNA is a type of DNA synthesized from the DNA of an organism. For this purpose, the DNA from any cell of the body can be extracted as the same genome is equally distributed in the organism.

Thus, Option-B is correct.

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John and Joshua used a light microscope to observe a plant cell. They indicated the magnification as x1000. Given the eye piece
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Answer:

Objective Lens Magnification = ×100

Explanation:

In a microscope, the ocular (eyepiece) lenses are usually to a magnification of ×10, meaning that it magnifies the image 10 times. While the standard objective lenses have magnifications of ×4, ×10, ×40, and ×100.

In order to work out the total magnification, the individual magnifications of the ocular and objective lenses have to be known, after which a simple multiplication of both magnifications will give the total magnification used.

Total Magnification = (eyepiece lens magnification) × (objective lens magnification)

1000 = 10 × obejcetive lens magnification

Dividing both sides by 10

Objective lens magnification = 1000 ÷ 10 = 10

∴ Objective lens magnification = ×100

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