question 1
(PLB) - Among the statements below, tick the one(s) that correctly characterize(s) the proteins:
I. They are essentially formed by C, H, O, N.
II. They are macromolecules formed by the successive union of different types of carbohydrates.
III. They can form differentiated structures, called primary, secondary, tertiary and quaternary.
IV. Its basic constituent is the amino acid.
a) I, II and III.
b) II, III and IV.
c) I, III and IV.
d) II and IV.
e) Only I.
question 2
(FCM-Mg) Proteins, formed by the union of amino acids, are fundamental chemical components in the physiology and cellular structure of organisms. Which of the following statements about proteins is CORRECT?
a) The stability of the quaternary structure in proteins is mainly due to the covalent bonds between their subunits.
b) The information required for the correct folding of a protein is contained in the specific sequence of amino acids along the polypeptide chain.
c) The formation of a disulfide bridge in a protein requires that the two participating cysteine residues be adjacent to each other in the protein's primary sequence.
d) Sickle cell anemia, caused by nutritional deficiencies, is attributed to the breakdown of red blood cells in function of the denaturation of the hemoglobin protein molecule as a result of the increase in temperature body.
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