Essays / Unlike other professions scientists accept that they don't know.... Discuss?? [2]

I'am currently an international student studying Biochemistry. I'am currently in my last year.
In my module "Social Aspects Of Science" I have a essay to write which i'am seriously finding very hard to start off.

The question given to us is:

Unlike other professions scientists accept that they don't know... Discuss??

I would really be grateful for any help you can give me. Thank you in advanced