STRUCTURE AND PROPERTIES OF PEPTIDES QUIZ

Secondary structure in protein refers to

three dimensional arrangement of all amino acids in polypeptide chain

protein made up of more than one polypeptide chain

regular folding of regions of the polypeptide chain

linear sequence of amino acids joined together by peptide bond

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When pO2 = Kd of myoglobin, the fractional saturation (YO2) is about

0.9

1.7

0.5

0.1

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An oil drop with a polar coat is a metaphor referring to the three dimensional structure of

collagen

fibrous proteins

silk protein

globular proteins

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In the β-pleated sheet

hydrogen bonds are formed between the peptide bonds

adjacent polypeptide chains can either be parallel or antiparallel

All of these

the polypeptide chain is fully extended

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What was the first protein whose complete tertiary structure was determined?

Pancreatic DNase

Lysozyme

Myoglobin

Pancreatic ribonuclease

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Which of the three subunits of the G proteins binds GDP and GTP?

Delta

Beta

Gamma

Alpha

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The oxygen binding curves of hemoglobin and myoglobin

allow maximum transfer of oxygen to the tissues

both (a) and (b)

are a consequence of the quaternary structure of hemoglobin

are identical

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The resonance structures that can be drawn for the peptide bond indicate that the peptide bond

is still not completely understood

has partial double bond character

both (a) and (b)

is stronger than an ordinary single bond

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The Ramachandran Plot illustrates the fact that

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

the F & Y angles can assume approximately three different values

the peptide bond is planar

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

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The different orders of protein structure are determined by all of the following bond types except

phospho-diester bonds

disulfide bridges

peptide bonds

hydrogen bonds

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