NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution?

  • Yellow

  • Green

  • Blue

  • Red


The net pressure gradient that causes the fluid to filter out of the glomeruli into the capsule is

  • 20 mm Hg

  • 75 mm Hg

  • 30 mm Hg

  • 50 mm Hg


Centromere is required for

  • transcription

  • crossing over

  • cytoplasmic cleavage

  • movement of chromosomes towards poles


Damage to thymus in a child may lead to

  • a reduction in haemoglobin content of blood

  • a reduction in stem cell production

  • loss of antibody mediated immunity

  • loss of cell mediated immunity


G-6-P dehydrogenase deficiency is associated with haemolysis of

  • lymphocytes

  • RBCs

  • platelets

  • leucocytes


Which of the following substances, if introduce in the blood stream, would cause coagulation, at the site of its introduction?

  • Fibrinogen

  • Prothrombin

  • Heparin

  • Thromboplastin


Nucleotide are building blocks of nucleic acids, nucleotide is a composite molecule formed by

  • (base-sugar-phosphate)n

  • base-sugar-OH

  • base-sugar-phosphate

  • sugar-phosphate


Which of the following is the simplest amino acid?

  • Tyrosine

  • Asparagine

  • Glycine

  • Alanine



Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these

  • enhance oxidative metabolism

  • are conjugated proteins

  • are exclusively synthesized in the body of a living organism as at present

  • help in regulating metabolism


help in regulating metabolism

Enzymes, vitamins and hormones are classified into a single category of biological chemical because all of them help in regulation of metabolism. 

Enzymes are a proteinaceous catalyst produced by cell and are responsible for high rate and specificity of one or more inter/ intra cellular biochemical recations.

Vitamin  is an organic substance, synthesized by plants (except Vitamin- D). 

Hormones are chemical messengers which on secretion bring about a specific and adaptive physiological response.


In a man, abducens nerve is injured. Which one ofthe following functions will be affected?

  • Movement of the eye ball

  • Swallowing

  • Movement of the tongue

  • Movement of the neck