If those are elements, then take a look at the amount of valence electrons they have. However, I'm thinking that those are compounds. If the compounds are stable, then they can't join together simply because the elements within the compounds have organized their valence electrons so that there is no longer a requirement for them. I don't know what these compounds are, but if I had to guess, it would be because they are both stable.
Thymine will always bond with adenine, and guanine will always bind with cytosine.
Adenine and guanine are the two purines bases present in DNA.Two purines in DNA are adenine and guanine.
Adenine is complimentary to thymine. Cytosine is complimentary to guanine.
Thymine will tend to hydrogen bond with adenine in DNA due to complementary base pairing. In RNA, uracil can also hydrogen bond with adenine.
The Cytosine, Guanine, Adenine and Thymine bases present in DNA are molecules that are held together by intermolecular hydrogen bonds. This bond occurs between an electronegative atom (known as a hydrogen bond acceptor) and a hydrogen atom attached to another electronegative atom (known as a hydrogen bond donor).
Thymine will always bond with adenine, and guanine will always bind with cytosine.
Adenine-Thymine Guanine-Cytosine
Adenine and guanine are the two purines bases present in DNA.Two purines in DNA are adenine and guanine.
Adenine is complimentary to thymine. Cytosine is complimentary to guanine.
Thymine will tend to hydrogen bond with adenine in DNA due to complementary base pairing. In RNA, uracil can also hydrogen bond with adenine.
Adenine and thymine bond,cytosine and guanine bond
The Cytosine, Guanine, Adenine and Thymine bases present in DNA are molecules that are held together by intermolecular hydrogen bonds. This bond occurs between an electronegative atom (known as a hydrogen bond acceptor) and a hydrogen atom attached to another electronegative atom (known as a hydrogen bond donor).
Guanine bonds with cytosine in DNA.
adenine and guanine are double ringed bases, that bond with thymine and cytosine (mono ringed bases). adenine bonds with thymine (double connection, whereas guanine bonds with cytosine (triple connection)
adenine and uracil and cytosine and guanine?
Adenine and Uracil, which pair together (Uracil takes the place of Thymine from DNA) Guanine and Cytosine, which also pair together
The two nitrogenous bases that are purines are adenine and guanine.