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TLS Online TPP Program

#Question id: 12657

Experiments performed in the laboratory of Anne Osbourn at the John Innes Centre  utilized genetic approaches to demonstrate the role of saponins in defense against pathogens of oat. If Mutant oat lines then,

#Unit 6. System Physiology – Plant
  1. Increase saponin  levels had more resistance to fungal pathogens than wild-type oats.
  2. reduced saponin levels had much less resistance to fungal pathogens than wild-type oats.
  3. Increase saponins levels had much less resistance to fungal pathogen than wild-type oats.
  4. reduced saponin levels had more resistance to fungal pathogens than wild type oats.
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TLS Online TPP Program

#Question id: 723

#Unit 1. Molecules and their Interaction Relevant to Biology

Common structural elements in proteins such as α-helices or β-sheets are characterized by uniformly repeating, energetically favorable main chain conformations which additionally exhibit a completely saturated hydrogen-bonding network of the main chain NH and CO groups. Although polyproline or polyglycine type II helices (PPII or PGII ) are frequently found in proteins, they are not considered as equivalent secondary structure elements. Which of the following statements are correct about PP and PGs.

A. PGII -like helices form hexagonal bundles which appear to fulfill the criterion of a (largely) saturated hydrogen-bonding network of the main-chain groups

B. main chain NH and CO groups of the central PGII -helix are saturated by either intra- or intermolecular hydrogen-bonds, resulting in a self-contained hydrogen-bonding network

C. The formation of the right-handed PPI helix is possible only with proline residues because of the required cis conformation. 

D. PPII helices seem to be stabilized by main chain-water hydrogen bonds (in the absence of main chain- main chain H-bonds), and tend to have a regular pattern of hydrogen bonds with water. After this, it is not surprising, that PPII helices are found mostly on the protein surface.
TLS Online TPP Program

#Question id: 19473

#Unit 12. Applied Biology

Tolerance of EPSPS to glyphosate is achieved due to amino acid replacement by
TLS Online TPP Program

#Question id: 23358

#General Aptitude

Which of the following is a best method to control noise in the class room situation?
TLS Online TPP Program

#Question id: 12481

#Unit 2. Cellular Organization

Following statements are regarding to Kinetochore-microtubule interaction in S. cerevisiae.
A. In the simple kinetochore of S. cerevisiae, a protein complex called CBF3 associates with specialized, centromere-specific form of histone H3, called CENP-A.
B. The Ndc80 complexes initially make lateral interactions with a spindle microtubule and subsequently interact with a Dam1 complex, which forms a ring around the end of the microtubule. This interaction results in an end-on attachment of the centromere to the
spindle microtubule.
C. Microtubules that “capture” kinetochores are selectively stabilized by a reduction in the rate of catastrophes, which increases the chance that the attachment will persist.
D. With the two kinetochores attached to opposite poles, the duplicated chromosome is now under tension, being pulled in both directions by the one sets of kinetochore microtubules.
Which of the following combinations is correct?
TLS Online TPP Program

#Question id: 5005

#Unit 11. Evolution and Behavior

Fossilized stromatolites