Which statement best describes the difference(s) between structures I and II in this reaction of rhodopsin in the presence of light? I. Structure II is more linear than structure I. II. Structure I is more linear than structure II.
III) A cis double bond in structure I has been converted to a trans double bond in structure II.
IV) A trans double bond in structure I has been converted to a cis double bond in structure II.

Question

Which statement best describes the difference(s) between structures I and II in this reaction of rhodopsin in the presence of light?  I. Structure II is more linear than structure I. II. Structure I is more linear than structure II.
III) A cis double bond in structure I has been converted to a trans double bond in structure II.
IV) A trans double bond in structure I has been converted to a cis double bond in structure II.

Quizplus · Accepted Answer

Statement I is false, as structure II is more bent than structure I. Statement II is false, as structure I is more bent than structure II. Statement III is true, as the cis double bond in retinal in structure I isomerizes upon absorbing light to become a trans double bond in structure II. Statement IV is also true, as the trans double bond in retinal in structure I isomerizes upon absorbing light to become a cis double bond in structure II. Therefore, the best choice is D as both statements III and IV are true.

Which Statement Best Describes the Difference(s) Between Structures I and II