Question
E) van der Waals forces 3. Proteins often have regions that can fold and function as an independent entity from the whole protein These regions are called: A) domains. B) oligomers. C) peptides. D) sites. E) subunits 4, A D-amino acid would interrupt an helix made of L-amino acids. Another naturally occurring hindrance to the formation of an helix is the presence of: A) a negatively charged Arg residue. B) a nonpolar residue near the carboxyl terminus. C) a positively charged Lys residue. D) a Pro residue E) two Ala residues side by side. 0 9 5. The major reason that antiparallel p-stranded protein structures are more stable than parallel p-stranded structures is that the latter: A) are in a slightly less extended configuration than antiparallel strands. B) do not have as many disulfide crosslinks between adjacent strands C) do not stack in sheets as well as antiparallel strands D) have fewer lateral hydrogen bonds than antiparallel strands. E) have weaker hydrogen bonds laterally between adjacent strands. 2
Explanation / Answer
3) A protein domain is a conserved part of a protein. The protein domain has its individual existence, i.e, the domain doesn’t need the agency of the protein to perform its functions. Domains are three dimensional structures and are often folded. Domains may contain 25 amino acids to as many as 500 amino acids.
Therefore, the correct answer is (A).
