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ololo11 [35]
2 years ago
5

Which conclusions are correct from the thin-layer chromatography of the inks?

Biology
1 answer:
Dennis_Churaev [7]2 years ago
8 0

Based on the result in this experiment, the mobile phase rose up on the TLC plate then dragged the ink from the marked dot up along the TLC plate, which is the light pink pigment whose Rf was 0.98 had the greatest affinity to the mobile phase. Moreover, the pigment that was closer to the marked dot was more attracted to the stationary phase, which is the dark pink spot that had an Rf of 0.72 and had a greater affinity to the stationary phase.

 

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Answer:

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What was known before Franklin and Wilkins conducted their studies of DNA? Check all that apply. DNA is found in the nucleus of
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Answer:

The correct answer will be-

   1. DNA is found in the nucleus of a cell

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    3. Cells contain protein molecules.

Explanation:

The study of DNA started much before the discoveries of Rosalind Franklin and Maurice Wilkins.

Nucleus of cell was discovered by Robert Brown in 1831 but the material present inside the nucleus called "nuclein" (DNA) came from the studies of Johann Friedrich Miescher in 1869.

Proteins as a constituent of cell were discovered by the experimental analysis of Gerhardus Johannes Mulder in 1837.

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Franklin and Maurice Wilkins are known for their work on the the structure of DNA as they were able to produce high-resolution X-ray photographs of DNA fibres called Photo 51 in 1952 using X-ray diffraction technique. By 1953 Franklin concluded concluded that DNA shows helical structure with phosphates on outer side.

Thus, 1. DNA is found in the nucleus of a cell

         2. Organisms store and transmit genetic information

         3. Cells contain protein molecules.

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