midsem_2017_Ls4208 1.Sea-floor spreading explains many observations related to t
ID: 287219 • Letter: M
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midsem_2017_Ls4208
1.Sea-floor spreading explains many observations related to the mid -ocean ridge.Explain this statement [6 marks]
Open with . 3. Three peptide sequences are forming alpha helices in the crystal structures. There sequences are given below: alBoc-Val-Aja-Phe-Ajb-Vel-Alp-Phe-Ajb OMe b] Boc-Alb-Ala. Phe-Alb-Phe-Ala-Val Alb-oMe c) Boc-Val-Ala-Ala-Aib-Val-Ala-Ala-Aib-OMe Boc is the N-terminus protecting group and OMe is C-terminus protecting group. Draw the possible CD spectra for the three helices. While showing the CD spectra please explain the CD bands appearing due to helical conformation, exciton splitting and also explain the intrahelix and interhelix aromatic effect in case peptides are expected to show the aromatic effect for peptides having aromatic residues [34343-9] .Explanation / Answer
Sea Floor spreading
Sea floor spreding occurs along a divergent boundary, where constructive process take place. The main observation that supports seafloor spreading theory is that, as the age of rock sampes analysed towards the ridge shows a younger age compared to the rocks away from the ridge and also sediment cover is getting thinner towards ridge. Another noted feature is that the rock making up the oceanfloor is considerably younger than the continents, with no samples found over 200 million years old. this confirms that the older ocean rocks are reabsorbed to the trench system. Another notable feature is that the temperature variation of sea water near the ridge, the water near the ridge is much warmer compared to the water away from the ridge. this indicates the volcanic acitivity near the trench zone.
Magnetic studies done along the mid oceanic ridge shows patterns of normal and reversed polarity and the bands are parallel to the rift and are symmetrically distributed on either side of it. The magnetic history of the earth is well recorded in the midoceanic ridge and also it forms a continious record of the movement of the ocean floor.
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