X In the alpha helix, the hydrogen bonds: * O Are roughly parallel to the axis of the helix Are roughly perpendicular to the axis of the helix Occur mainly between electronegative atoms of the R groups Occur only between some of the amino acids of the helix Occur only near the amino and carboxyl termini of the helix 0/1 X

X In the alpha helix, the hydrogen bonds: * O Are roughly parallel to the axis of the helix Are roughly perpendicular to the axis of the helix Occur mainly between electronegative atoms of the R groups Occur only between some of the amino acids of the helix Occur only near the amino and carboxyl termini of the helix 0/1 X

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter8: The Structure, Replication, And Chromosomal Organization Of Dna

Section: Chapter Questions

Problem 15QP: Using Figures 8.7 and 8.9 as a guide, draw a dinucleotide composed of C and A. Next to this, draw...

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Using Figures 8.7 and 8.9 as a guide, draw a dinucleotide composed of C and A. Next to this, draw the complementary dinucleotide in an antiparallel fashion. Connect the dinucleotides with the appropriate hydrogen bonds. FIGURE 8.9 The two polynucleotide chains in DNA run in opposite directions. The left strand runs 5 to 3, and the right strand runs 3 to 5. The base sequences in each strand are complementary. An A in one strand pairs with a T in the other strand, and a C in one strand is paired with a G in the opposite strand. FIGURE 8.7 Nucleotides can be joined together to form chains caled polynucleotides. Polynucleotides are polar molecules with a 5 end (at the phosphate group) and a 3 end (at the sugar group). An RNA polynucleotide is shown at the left, and a DNA polynucleotide is shown at the right.
In the alpha-helices, which of the following statement is NOT true? a. Backbone carbonyl oxygen of residue (i) hydrogen bonds to backbone NH of the fourth residue of chain of residue (i + 4). b. Side chains project out from an α-helix. c. Hydrogen bonds are almost straight and parallel to the helix axis. d. Helix has a macrodipole. e. The rise or advance per amino acid residue is 0.54 nm.
Show below is a polypeptide comprised of 3 α-helices and 5 β-sheets joined by randomcoil. Characterizetheforces that stabilize the tertiarystructure and draw the interacting side chains ofd) Cys Cys
The best definition of an endonuclease is that it hydrolyzes A. nucleotide from only the 3' -end of an oligonucleotide . B. nucleotide from either terminal of an oligonucleotide. C. phosphodiester bond located in the interior of a polynucleotide . D. bond only in a specific sequence of nucleotides. E. bond that is distal co the base chat occupies the 5' position of the bond
In the α helix the hydrogen bonds: a. are roughly parallel to the axis of the helix. b. are roughly perpendicular to the axis of the helix. c. occur mainly between electronegative atoms of the R groups. d. occur only between some of the amino acids of the helix. e. occur only near the amino and carboxyl termini of the helix.
Alpha-helices have 3.6 amino acid residues per turn, ie a helix 36 amino acids long would form 10 turns, and The axial distance between adjacent residues is 3.5 Angstroms. Beta-helices have two residues per repeat unit which gives the beta-strand a 7 Angstrom pitch. This compares with the alpha-helix where the axial distance between adjacent residues is only 1.5 Angstroms. Then how many residues in an alpha-helix conformation would it take to traverse the same distance as 10 residues in beta-strand conformation?
An unspecified protein contains a 15-residue long α-helix with the following sequence: WEANIKQRLSTMGEYKQCHANG a. How many full turns are there in this α-helix? b. What is the length of the helix (in Angstroms) in the direction of the helix axis? c. How many hydrogen bonding interactions would be there in this α-helix? d. If it was a 310 helix instead with a helical pitch of 6 Å, is it long enough to span the 30 Å bilayer? Calculate and explain.
A sequence of amino acids in a certain protein is found to be -Ser-Gly-Pro-Gly-. The sequence is most probably part of a(n): A) parallel β sheet. B) α sheet. C) β turn. D) α helix. E) antiparallel β sheet.
Draw the structure of an α-helix (polypeptide backbone only, no side chains) as accurately as possible (correct number of amino acids per turn, labelled with the correct measurementof the pitch, label each amino acid unit, etc).
Draw and label the dinucleotide AT as follows: A. 5’ and 3’ ends B. Phosphodiester bond C. N-glycosidic bonds
What does the "alpha" indicate in "α-helix"? It is a Greek helix. It's position lies above the beta-pleated-sheet. It has only the one enantiomer. It predominates in the 3º structure of the protein. None of these.
This is DNA. Locate the nitrogen bases (nitrogens are blue). Where are they located in the molecule?Locate the sugars and phosphates, and describe their location. Adjacent nucleotides are linked by covalent phosphodiester bonds (-O-P-O-) produced by a condensation reaction. What parts of the adjacent nucleotides are linked by phosphodiester bonds?Two nitrogenous bases extending towards the middle of the double helix. Are there any covalent bonds between these bases?If there are no covalent bonds between these bases, what other kinds of bonds might hold the two strands of the double helix together?