Question

Fat globules in raw milk average about ____________________in diameter.

(a) of 1/25,000 of an inch, more or less 1 micron

(b) of 6/25,000 of an inch, more or less 6 microns

(c) of 1/2,500 of an inch, more or less 100 microns

(d) of 1/250 of an inch, more or less 1000 microns

I had been asked this question during an interview for a job.

Origin of the question is Dairy Products in division Products of Dairy Engineering

Answer 1

The correct answer is (b) of 6/25,000 of an inch, more or less 6 microns

Easy explanation: The native fat globule membrane (FGM) is comprised of the apical plasma membrane of the secretory cell which continually envelopes the lipid droplets as they pass into the lumen. More than 95% of the total milk lipid is in the form of a globule ranging in size from 0.1 to 15 um in diameter.