What are opsins and what are they a part of?
a. membrane lipids that form a complex with a retinal molecule at the centre
b. membrane proteins that form a complex with a retinal molecule at the centre
c. retinal molecules that form a complex with membrane proteins at the centre
d. retinal molecules that form a complex with membrane lipids at the centre
Ans: b. membrane proteins that form a complex with a retinal molecule at the centre
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Why is it necessary for DNA to duplicate before cells divide