Zoology MCQs for NEET — Practice Questions with Answers

The length of one complete spiral (or turn) of the DNA double helix is 34 Ångströms (3.4 nanometers). This measurement corresponds to 10 base pairs.

Glycogen is a form of stored glucose primarily found in the liver and muscles. The liver stores glycogen to help regulate blood sugar levels, while muscle glycogen is used as a quick source of energy during physical activity.

James Watson and Francis Crick are credited with the discovery of the double-helix structure of the DNA molecule in 1953. Their work was based on earlier research by Rosalind Franklin and Maurice Wilkins, among others.

Nitrogen bases such as adenine, guanine, cytosine, thymine, and uracil do not contain phosphorus. They primarily consist of nitrogen, hydrogen, and carbon atoms.

purines are heterocyclic .among the given options Adenine is the only purine 

m-RNA (messenger RNA) is a polymer made up of ribonucleotides, which are the basic building blocks of RNA. Each ribonucleotide consists of a ribose sugar, a phosphate group, and a nitrogenous base.

t-RNA (transfer RNA) is not synthesized by m-RNA. Instead, t-RNA is transcribed from DNA. The primary function of t-RNA is to carry amino acids to the ribosome during protein synthesis.

ATP (Adenosine Triphosphate) is the common instant source of energy for cellular activities. It acts as an energy currency in cells, providing the energy needed for many biochemical reactions. The energy is released when ATP is hydrolyzed to ADP (Adenosine Diphosphate) and an inorganic phosphate.