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de 6 out of a maximum of 10 (60%) A complete turn of the A-DNA helix occurs at which distance? Choose one answer. . .O.Od A. 33 A B. 10 A C. 29 A D4A Incorrect Marks for this submission: 0/1. A pentapeptide has the following proportions of amino acids: gly (1), leu (1),val (1), phe (2). Treatment of the pentapeptide with chymotrypsin gave the following fragments: gly-val, leu, phe. Which is the structure of the pentapeptide? Choose one answer. A. phe-phe-gly-val-lou B. gly-val-pho-leu-phe C. leu-gly-val-phe-phe D. phe-leu-gly-val-phe Incorrect Marks for this submission: 0/1. 1 Karl Nessler received the patent for the so-called "hot procedure for a permanent (hair) in 1906. The hair was treated with a basic solution (NaOH in water, pH approx. 10) and then heated for several hours on the curler. The result was often extremely curly hair. What kind of bonds was were actually (partiaily) broken and reformed? a hydrogen bonds b. lonic bonds c. disulfide-bridges d. dipolar bonds Choose one answer A. a and are correct B. a, b and care correct c. a, b, and d are correct D. all of the above are correct WW

Answer 1

Q1. Ano. 33 À is the correct answer Explaination - Each tion of has 33 Ř distance. the DNA helix Q2. And B. b. gly-val-phe-leu-phe is the correct answer. Explaination Enzyme chymotrypsin cuts the peptiale chain from c-terminal side of Phenylalanine. Only sequence separates gly-vol-phe -leu-phe gly-val from Leu. gly-valaphe thuaphe → lee phe + gly-valaphe Q3. Ans. Bo aob and a correct. are Explaination → Hydrogen bonds, salt bonds and disulfide bonds are present in hair. Disulfide bonds can be broken apart by bases like Nach bases like noon salt bonds are also broken by alkaline solutions, Hydrogen bonds are easily broken in the presence of water and heat. They responsible for changing the overall shape of arie hair.