The purines are bases in the DNA. The two purines in DNA are Adenine and Guanine. These two purines forms hydrogen bonds with their complimentary pyrimidines such as Thymine and Cytosine to keep the two rails of the DNA molecule together.
Bull market is that market where stock value are expected rise and people will have tendency to sell their stock so as to earn profit out of it. Thus sudden push from the suppliers will gradually niutalise the market.