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)

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TLS Online TPP Program

#Question id: 10795

#Unit 6. System Physiology – Plant

basic carbon skeleton of a flavonoid contains 15 carbons arranged in two aromatic rings connected by a three-carbon bridge. This structure results from two separate biosynthetic pathways:

TLS Online TPP Program

#Question id: 12775

#Unit 10. Ecological Principles

Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in  density  at  three-  to  five-year  intervals.  Which  of  the  following  represent  (a)  plausible  explanation(s)  of  these cycles?

TLS Online TPP Program

#Question id: 10226

#Unit 6. System Physiology – Plant

Under moderate excess light Quantum efficiency decreases , but the maximum photosynthetic rate remains unchanged and caused by the diversion of absorbed light energy toward heat dissipation—hence the decrease in quantum efficiency this term is known as

TLS Online TPP Program

#Question id: 4983

#Unit 11. Evolution and Behavior

As rat pups mature, the growth of their snouts and tails outpaces growth of the rest of their bodies, producing the appearance of sexually mature males. It is found that sexually mature female rats prefer to mate with mutant, sexually mature males that possess snouts and tails with juvenile proportions. Which of the following terms is (are) appropriately applied to this situation?

TLS Online TPP Program

#Question id: 4196

#Unit 3. Fundamental Processes

The role of EF-Tu in bacterial protein synthesis is