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"Research on the human genome has implications that are not exclusively scientific or medical. They lead on to applications which affect all aspects of people's lives, whether it be private life; family life ; or life as members of society."
My question is why we use 'be ' here instead of using 'is ' or 'are'.
Thank you for any information related to above question in advance.
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Hello Jacklong

The 'be' in your sentence is a present subjunctive. The present subjunctive in all persons is the same as the base form of the verb.

It's used especially in subordinate clauses after verbs that express a demand or recommendation, e.g.

1. I demand that he stop work immediately.
2. I recommend that he see a doctor as soon as possible.
3. It is important that he be placed in a rear-facing car seat that is properly secured.

You don't hear it very often in BrE; I understand it's more common in AmE.

MrP
Comments  
Here, "be" = "may be". e.g.

"Research on the human genome has implications that are not exclusively scientific or medical. They lead on to applications which affect all aspects of people's lives, whether it MAY be private life; family life ; or life as members of society."

Another example:-

"Be it me, you or him, we are all still insinuated by their snide remarks" = "Whether it may be me, you or him, we are all still insinuated by their snide remarks."
 MrPedantic's reply was promoted to an answer.