Skip to content
MathsGenie logo
Open app

Course home

  1. A Level
  2. Biology OCR A
  3. Question bank

Foundations in biology

EasyMedium
1234567891011121314151617181920212223242526272829303132333435363738394041
Question 33

Synaptic vesicles are small, spherical membrane-bound organelles that store and transport neurotransmitters in neurons. A high-resolution cross-section through the center (the widest part) of a synaptic vesicle shows exactly 424242 phospholipid molecules making up its circular outer membrane boundary.

Calculate the estimated number of phospholipid molecules on the entire outer surface of this spherical vesicle.

Assume the distribution of phospholipids is uniform across the entire outer membrane surface of the synaptic vesicle.

Use the formula: Surface area of a sphere=4πr2\text{Surface area of a sphere} = 4\pi r^2Surface area of a sphere=4πr2

[3]

Foundations in biology Questions

  1. A Level
  2. /Biology
  3. /Foundations in biology