Question

quest 4

a. rorogun bon b. lonic bonds c. disulfide-bridges d. dipolar bonds Choose one answer A. a and b are correct B. a, b and care correct C. a, b, and d are correct D. all of the above are correct 3 . Incorrect Marks for this submission: 0/1. in 4 The first known procedures to bend straight hair into curls dates from 3000 B.C.: Hot Curlers made from clay were used. The hair was apparently dry. What kind of bonds was/were actually broken and reformed? Marks: 1 Choose one answer A. hydrogen bonds Bionic bonds C. disulfide-bridges D. dipolar bonds Incorrect Marks for this submission: 0/1. 5 Marks: 1 The structure of vasopressin is very similar to that of oxytocin (primary sequence of vasopressin: cysteine - tyrosine -phenylalanine-glutamine - asparagine-cysteine proline-arginine-glycine), which is also a nonapeptide with a disulfide bridge. One of the most important roles of vasopressin is to regulate the body's retention of water, It is released when the body is dehydrated and causes the kidneys to conserve water, thus concentrating the urine, and reducing urine volume. In addition, it has a variety of neurological effects on the brain. What are the differences in the structures of vasopressin and oxytocin? a. residue #3: isoleucine (oxytocin) vs. phenylalanine (vasopressin) b. residue NT isoleucine (oxytocin) vs. phenylalanine (vasopressin) c. residue #8: Leucine (oxytocin) vs. arginine (vasopressin) d. residue #4: asparagine (oxytocin) vs. cysteine (vasopressin) TI Choose one answer A. a and b are correct 30 dtv ARR 9 ww

Answer 1

The keratin is held into its position by hydrogen bonds. Heat from the hot curlers provide sufficient energy to break these hydrogen bonds and bend straight hair into curls. More the no of disulfide bonds, more will be culrl hair. To bend hair from straight to curly we need to break hydrogen bonds.

So the answer is hydrogen bond