Our DNA is 1% uniquely human, meaning only 1% of our DNA is responsible for making us humans different from other species, and also for making humans different from others. However, this is true because the large majority of processes that the genome codes for are shared among many, many species. The normal flora bacteria in our gut, on the skin, etc. are not human and do not account for any percentage of our DNA.
Rest assured, we are still very unique. The other 99% of the genome is still VERY important, and without it we would certainly not be human. In fact, we wouldn't be anything!
There are approximately 3 BILLION base pairs in the human genome, so 1 percent is still 30 MILLION base pairs.
This is probably true, give or take some percentage. The link above states that the DNA shared is that which is "coiled up very tightly." For those familiar with genetics, this is indicative of DNA that codes for very basic, common features which are shared among MOST living things (including bananas). The ~1% of DNA that is 'unique' to humans codes for an incredible amount of things. There are enough combinations in just this 1% that we are different from everyone on this Earth, everyone who ever has been on this Earth, and everyone who ever will be on this Earth. The differences between us and bananas are a little more obvious