NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Bacteriophages kill

  • fungi

  • parasites

  • bacteria

  • viruses



A bacteriophage is any one of a number of viruses that infect bacteria. Bacteriophages are among the most common biological entities on Earth.


Red cell count is carried out by

  • haemocytometer

  • haemoglobinometer

  • sphygmomanometer

  • electrocardiogram



The haemocytometer is a device originally designed for the counting of blood cells. It was invented by Louis Charles Malassez and consists of a thick glass microscopic slide with a rectangular indentation that creates a chamber.


Rh factor can produce disease

  • AIDS

  • Turner's syndrome

  • Erythroblastosis foetalis

  • Sickle-cell anaemia


Erythroblastosis foetalis

Erythroblastosis foetalis is a type of anaemia in which the red blood cells of a foetus are destroyed in a maternal immune reaction resulting from a blood group incompatibility between the foetus and its mother. The Rh system is responsible for the most severe form of the disease, which can occur when an RH-negative woman conceives on Rh-positive foetus.


The outer covering of cartilage is called

  • peritonium

  • periosteum

  • endosteum

  • perichondrium



Perichondrium is a dense layer of fibrous connective tissue that covers the surface of cartilage.

The peritoneum is the serous membrane forming the lining of the abdominal cavity or coelom in amniotes and some invertebrates, such as annelids. It covers most of the intra-abdominal (or coelomic) organs, and is composed of a layer of mesothelium supported by a thin layer of connective tissue.

Periosteum a dense layer of vascular connective tissue enveloping the bones except at the surfaces of the joints.

Endosteum is a thin vascular membrane of connective tissue that lines the inner surface of the bony tissue that forms the medullary cavity of long bones. 


Which one is diaminodicarboxylic amino acid?

  • Cystine

  • Lysine

  • Cysteine

  • Aspartic acid



Lysine is a diaminodicarboxylic amino acid with the chemical formula HO2CCH(NH2)(CH2)4 NH2. This amino acid is an essential amino acid, which means that humans cannot synthesize it. Its codon are AAA and AAG.


The blood does not clot inside the body because of

  • oxygenation of blood

  • movement of blood

  • heparin in blood

  • absence of fibrinogen in blood


heparin in blood

The blood does not clot inside the body because of heparin in blood. Heparin is a highly sulfated glycosaminoglycan. It is widely used as an injectable anticoagulant and has the highest negative charge density of any known biological molecule.


Which one is the cofactor of carbonic anhydrase?

  • Iron (Fe)

  • Zinc (Zn)

  • Copper (Cu)

  • Magnesium (Mg)


Zinc (Zn)

Many enzymes require the presence of an additional, nonprotein, cofactor. Some of these are metal ions such as Zn2+ (the cofactor for carbonic anhydrase), Cu2+, Mn2+, K+ and Na+. Some cofactors are small organic molecules called coenzymes. The vitamin-B are the precursors of coenzyme.


What is mitoplast?

  • Membraneless mitochondria

  • Another name of mitochondria

  • Mitochondria without outer membrane

  • Mitochondria without inner membrane


Mitochondria without outer membrane

Mitoplast is a mitochondrion without the outer membrane.


Which of the following is not a conjugated protein?

  • Peptone

  • Phosphoprotein

  • Lipoprotein

  • Chromoprotein



A conjugated protein is a protein that functions in interaction with other chemical groups attached by covalent bonds or by weak interactions, eg, lipoproteins, glycoproteins, chromoproteins, phosphoproteins, haemoproteins, flavoproteins, metalloproteins, phytochromes, cytochromes and opsin.


Vitamin-D is produced in human body in

  • muscles

  • nerves

  • skin

  • bone marrow



Vitamin-D is produced in the skin of vertebrates after exposure to ultraviolet light and occurs naturally in a small range of foods.