Practice Questions

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#Question id: 787

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

#XL - T Zoology

Six adenosines in a row in a DNA helix produce a bend of about 18 degrees.
DNA was first isolated and characterized by Friedrich Miescher who called the phosphorus-containing substance “nuclein.”
It is the pentoses that define the identity of a nucleic acid not the nitrogenous bases.
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: 936

#XL - Q Biochemistry

At neutral pH, the main ionic form of ammonia is ________.

TLS Online TPP Program

#Question id: 345

#XL - Q Biochemistry

As the [H₃O⁺] of the solution decreases, the [OH-] ________.

TLS Online TPP Program

#Question id: 1674

#XL - Q Biochemistry

Which of the following statements is TRUE of receptor editing?

TLS Online TPP Program

#Question id: 1760

#XL - Q Biochemistry

Effector memory T-cells can be distinguished from the central memory T-cells from which they arise by:

TLS Online TPP Program

#Question id: 19785

#XL - P Chemistry

Which of the following expressions imposes the condition of quantization of energy of an electron in an atom?