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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: 5706

#Unit 8. Inheritance Biology

Species A has 2n = 16 chromosomes and species B has 2n = 14. How many chromosomes would be found in an allotriploid of these two species?
TLS Online TPP Program

#Question id: 19791

#Unit 13. Methods in Biology

Which of the following statements about polymerase chain reaction is correct?
a) PCR denaturation temperature calculated by using Y = X (1+E)n
b) Size of the primer negatively affects the efficiency of PCR
c) Standard PCR doesn’t efficiently amplify sequence much longer than about 5kb.
d) Primer annealing of PCR at 550C for 1.5 min.
e) Time taken for each cycle of PCR considerably longer than 3 min.
TLS Online TPP Program

#Question id: 807

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following forces can stabilize a normal DNA double-helix?
TLS Online TPP Program

#Question id: 11574

#Unit 7. System Physiology – Animal

Glucocorticoids do which of the following?
TLS Online TPP Program

#Question id: 12401

#Unit 6. System Physiology – Plant

IAA enters the cell either passively in the undissociated form (IAAH) or by transporter in the anionic form (IAA-) , which one of the following  transporter are involved in influx of the anionic form of auxin?