TLS Online TPP Program

#Question id: 787


Which of the following statement is INCORRECT with respect to the structure of DNA?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. Six adenosines in a row in a DNA helix produce a bend of about 18 degrees.

  2. DNA was first isolated and characterized by Friedrich Miescher who called the phosphorus-containing substance “nuclein.”

  3. It is the pentoses that define the identity of a nucleic acid not the nitrogenous bases.

  4. The Z-DNA tracts do not play any role in regulating the expression of some genes or in genetic recombination.

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TLS Online TPP Program

#Question id: 27402

#Unit 1. Molecules and their Interaction Relevant to Biology

In which of the following lipid two phosphatidic acids share a single glycerol (R1 and R2 are fatty acyl groups).

TLS Online TPP Program

#Question id: 10527

#Unit 6. System Physiology – Plant

Based on their feeding behaviors, three major types of insect herbivores can be distinguished, which evades the constitutive defense;

A) Phloem feeders                                                                    i) caterpillars, grasshoppers, and beetles

B) Cell-content feeders                                                            ii) aphids and whiteflies

C) Chewing insects                                                                    iii) mites and thrips

Correctly match the feeding behaviour with its insects;

TLS Online TPP Program

#Question id: 27488

#Unit 1. Molecules and their Interaction Relevant to Biology

Cyclic monosaccharides or glycosides that are epimers, differing from each other in the configuration of C-1 if they are aldoses or in the configuration at C-2 if they are ketoses are known as

TLS Online TPP Program

#Question id: 7231

#Unit 5. Developmental Biology

Kragl and colleagues (2009) performed an experiment in which they transplanted limb tissue from a salamander whose cells expressed green fluorescent protein (GFP) into different regions of limbs of normal salamanders that did not have the GFP transgene. If they transplanted the GFP-expressing limb cartilage into a salamander limb that did not contain the GFP transgene, the GFP-expressing cartilage would integrate normally into the limb skeleton. They later amputated the limb through the region containing GFP-marked cartilage cells. The blastema was found to contain GFP-expressing cells, and when the blastema differentiated, the only GFP-expressing cells found were in the limb cartilage. Similarly, GFP-marked muscle cells gave rise only to muscle, and GFP-marked epidermal cells only produced the epidermis of the regenerated limb. Which of the following phenomenon is proved according to experiment?

TLS Online TPP Program

#Question id: 10131

#Unit 6. System Physiology – Plant

The detailed chemical mechanism of the oxidation of water to O2 is not yet well understood, but with structural information shows_one electron carrier, generally identified as Yz, functions between the oxygen-evolving complex and P680 to function in this region, Yz needs to have a very strong tendency to retain its electrons, this species has been identified as;