TLS Online TPP Program

#Question id: 2889


The edges of each base pair are exposed in the major and minor grooves, creating a pattern of hydrogen-bond donors and acceptors and of hydrophobic groups (allowing for Vander Waals interactions) that identifies the base pair. The edge of an C : G base pair displays the following chemical groups in the following order in the major groove:

#Unit 2. Cellular Organization
  1. A hydrogen-bond acceptor (at N7 of guanine), a hydrogen-bond acceptor (the carbonyl on C6 of guanine), a hydrogen-bond donor (the exocyclic amino group on C3 of cytosine), and a small nonpolar hydrogen (the hydrogen at C5 of cytosine)

  2. A hydrogen-bond acceptor (at N7 of guanine), a hydrogen-bond acceptor (the carbonyl on C6 of guanine), a hydrogen-bond donor (the exocyclic amino group on C4 of cytosine), and a small nonpolar hydrogen (the hydrogen at C5 of cytosine)

  3. A small nonpolar hydrogen (the hydrogen at C5 of cytosine), a hydrogen-bond donor (the exocyclic amino group on C4 of cytosine), a hydrogen-bond acceptor (the carbonyl on C6 of guanine) and a hydrogen-bond acceptor (at N7 of guanine)

  4. A small nonpolar hydrogen (the hydrogen at C5 of cytosine), a hydrogen-bond acceptor (the exocyclic amino group on C4 of cytosine), a hydrogen-bond acceptor (the carbonyl on C6 of guanine) and a hydrogen-bond donor (at N7 of guanine)