8. The major reason that antiparallel β-stranded protein structures are more stable than parallel β-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.

8. The major reason that antiparallel β-stranded protein structures are more stable than parallel β-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.

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木公的診間裝潢中

B1 · 2025/03/03

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The major reason tha...

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4. The first step in two-dimensional gel electrophoresis generates a series of protein bands by isoelectric focusing. In a second step, a strip of this gel is turned 90 degrees, placed on another gel containing SDS, and an electric current is again applied. In this second step: (A) proteins with similar isoelectric points become further separated according to their molecular weights. (B)the individual bands become stained so that the isoelectric focus pattern can be visualized. (C) the individual bands become visualized by interacting with protein-specific antibodies in the second gel. (D)the individual bands undergo a second, more intense isoelectric focusing. (E)the proteins in the bands separate more completely because the second electric current is in the opposite polarity to the first current.

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