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TLS Online TPP Program

#Question id: 30103

Direct sources of purine ring atoms in the de novo synthesis of IMP include:
1. glutamine.
2. a component of the tetrahydrofolate one-carbon pool.
3. aspartate.
4. glycine.

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. 1, 2 and 3
  2. 2 and 4
  3. 4 only
  4.  All four
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TLS Online TPP Program

#Question id: 12992

#Unit 1. Molecules and their Interaction Relevant to Biology

α-helix changes its configurations according to the environment then
a. membrane encompassing α-helix have nonpolar residue oriented toward the membrane lipid.
b. if α-helix is found in plasm then polar residue will be oriented toward the outside.
c. if α-helix is found in plasm then nonpolar residue will be present inside the core.
d.  membrane encompassing α-helix have polar residue oriented towards the membrane lipid.
Choose incorrect statement
TLS Online TPP Program

#Question id: 1033

#Unit 4. Cell Communication and Cell Signaling

 A research lab is trying to produce new antibiotics. They come up with drugs that detach the hydrophilic heads from the phospholipids in plasma membranes. This drug
TLS Online TPP Program

#Question id: 2509

#Unit 2. Cellular Organization

Which of the molecular motor proteins is associated with microtubules?
TLS Online TPP Program

#Question id: 5250

#Unit 8. Inheritance Biology

A researcher would like to map the location of galE and trpA genes in a new species of bacterium that appears to be closely related to E. coli. He decides to use cotransduction, and generatesnappropriate donor and recipient strains. He is disappointed when cotransduction is not seen in his experiement. What is the most reasonable explanation for this situation?
TLS Online TPP Program

#Question id: 8788

#Unit 9. Diversity of Life Forms

A phylogenetic tree is shown for the three domains of life (Eukarya, Archaea, and Bacteria). The tree branches in two directions from the first point, labeled Common ancestor of all life. One branch leads in the direction of Eukarya and Archaea, and the other branch leads to Bacteria. The branch leading to Eukarya and Archaea divide, one branch leading to each domain. The branch leading to Eukarya divides into four branches. One leads to Euglenozoans, and the other three lead to branching points. The first leads to Forams in one direction, and another branching point in the other that leads to Diatoms and Ciliates. The second branching point leads to Red algae in one direction, and a branching point that leads to green algae and land plants in the other direction. The third branching point leads to amoebas in one direction, and a branching point that leads to fungi and animals in the other direction. Land plants, Fungi and Animals are all highlighted.

Examine the figure. If you were a graduate student trying to develop a thesis project that would resolve polytomies, which of the following groups would you study?