Secondary structural elements are often observed in groupings commonly called A rolls B motifs C lobes D clusters E domains
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Which statement is not true about motifs and domains? Select one: a. Motifs only have structural significance. b. Different proteins contain different proportions and arrangements of secondary structural elements. c. A supersecondary structure (also called motif) is a combination of various secondary structural elements. d. The most common motif is Beta in which an alpha helix connects two parallel strands of a Beta sheet. e. A long polypeptide chain usually folds into globular clusters which are known as domains.
Ma Ednelyn L.
16. Which ONE of the following statements accurately describes the SECONDARY STRUCTURE of a protein? (A) The sequence of amino acids in the chain and the location of all the disulfide bridges. (B) The regular conformations assumed by segments of the protein’s backbone when it folds (e.g. a-helix or b-pleated sheet). (C) The three-dimensional structure of the entire polypeptide. (D) The way individual protein subunits are arranged together to form one large multi-unit protein. (E) The mechanism by which an enzyme catalyses a chemical reaction.
Katherine K.
Some regions of protein secondary structure are described as "random coil". This designation is misleading because: A. the secondary structure must always be an alpha helix or beta sheet. B. although the structure is indeed random, it need not necessarily resemble a "coil". C. although the region may be unique to a particular protein, it is not random: each cellular copy of that protein will contain an identical "random coil" structure that corresponds to the same portion of primary sequence. D. an alpha helix represents one type of "coil", but its structure is certainly not random. E. actually all types of secondary structure are random in nature.
Rupsa S.
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