1. The lipid bilayer forming cell membranes behaves as a 2D fluid whose fluidity depends largely on its lipid compositio

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1. The lipid bilayer forming cell membranes behaves as a 2D
fluid whose fluidity depends largely on its lipid composition.
Phospholipid molecules in the bilayer can diffuse laterally, and
the rate of diffusion as a proxy for fluidity can be observed using
FRAP experiments. Which of the following changes would lead to
longer recovery time from photobleaching?
choices
a. Adding more cholesterol to the membrane composition
b. Decreasing cis-double bond content relative to trans-double
bond content in the phospholipids
c. Increasing unsaturated phospholipid content
d. Removing membrane-embedded proteins
2.
If a fluorophore is excited at 594 nm, which of the following
wavelengths does it MOST likely emit at?
choices
a. 561 nm
b. 585 nm
c. 610 nm
d. 740 nm