MAGADHA EMPIRE QUIZ

analogous to the steps in a spiral staircase

not present at Phe residues

roughly parallel to the helix axis

more numerous than Vander Waals interactions

the Fe2+ and cysteine

the Fe2+ and histidine

the Fe3+ and histidine

the Fe3+ and cysteine

also have a cis geometry in their peptide bonds

do not occur in nature

have Y = F = 180°

are equivalent to the (3-sheet structure

is planar because of steric hinderance

usually trans unless proline is the next amino acid

usually cis unless proline is the next amino acid

only found between proline residues

has partial double bond character

is stronger than an ordinary single bond

is still not completely understood

both (a) and (b)

the F & Y angles can assume any value in a peptide

the F & Y angles can assume approximately three different values

the F & Y angles can assume only a single value in a protein

the peptide bond is planar

Val-Lys-Glu-Met-Ser-Trp + Arg-Ala

Val-Lys-Glu + Met-Ser-Trp-Arg-Ala

Val-Lys-Glu-Met + Ser-Trp-Arg-Ala

Val-Lys + Glu-Met-Ser + Trp-Arg-Ala

0.1

1.7

0.9

0.5

four nitrogens of heme and to a water molecule

two nitrogens of heme and to three His residues in Hb

two nitrogens of heme and to three water molecules

four nitrogens of heme, the proximal His, and a water molecule

globular proteins

collagen

silk protein

fibrous proteins