HSST Zoology Previous Year Questions and Answers (1-50)

 HSST Zoology Questions and Answers

HSST Zoology  Previous Year Questions and Answers (1-50)

1. The term “molecular stitcher” refers to

A) DNA polymerases B) DNA ligase C) DNA glycosylases D) DNA methylation

Ans: B) DNA ligase


2. A DNA strand having the base sequences ATTGCCAATAC is mutated to ATTGCCAAGAC, the mutation that occurs is termed as

A) Transduction B) Translocation C) Transition D) Transversion

Ans: D) Transversion


3. When the temperature and pressure remains constant the rate of diffusion of a gas will

be inversely proportional to the square root of the density states is the

A) Graham’s Law of diffusion

B) Max Planck theory

C) Bohr theory

D) Avagadro’s law

Ans: A) Graham’s Law of diffusion

4. Glutamate is the precursor of aminoacids

A) Proline and arginine

B) Proline and cysteine

C) Glycine and cysteine

 D) Arginine and glycine
Ans: A) Proline and arginine


5. Sensory hair cells in the cristae ampullaries contact

A) Striavascularis

B) Gelatinous cupola

C) Basilar membrane

D) Associated hairs

Ans: B) Gelatinous cupola


6. The fight, flight and fright hormone is

A) Adrenalin B) Pituitary C) FSH D) Aldosterone

Ans: A) Adrenalin


7. Severe combined immune deficiency is a genetic defect due to deficiency of

A) Adenosine triphosphatase

B) Maleyl acetoacetic acid

C) Transaminase

D) Adenosine deaminase

Ans: D) Adenosine deaminase


8. An inborn error in the metabolism of the amino acid tyrosine is associated with

A) Alkaptonuria B) Phenylketonuria C) Albinism D) Cretinism

Ans: C) Albinism


9. Which one of the following is notan extraembryonic membrane ?

A) Amnion B) Albumin C) Chorion D) Allantois

Ans: B) Albumin


10. Egg of petromyzoneis

A) Isolecithal B) Macrolecithal C) Mesolecithal D) Microlecithal

Ans: C) Mesolecithal


11. Galactosaemia is a congenital disease when normal metabolism of galactose is lacking

an enzyme

A) Galactose-1-phosphate uridyltransferase

B) Galactose-1-phosphatase

C) Galactose-1-2-phosphatase

D) Galactose-1-phosphate transferase

Ans: A) Galactose-1-phosphate uridyltransferase


12. The physiologically active form of pantothenic acid essential for metabolism

A) Acetylcholine B) Choline C) Coenzyme A D) None of the above

Ans: C) Coenzyme


13. Bitot’s spots is caused by the deficiency of

A) Vitamin A B) Vitamin D C) Vitamin K D) Vitamin B

Ans: A) Vitamin A


14. Erythrocytes do not transport the enzyme

A) Choline esterase

B) Carbonic anhydrase

C) Permease

D) Methaemoglobin reductase

Ans: A) Choline esterase


15. Composite molecule of DNA in which a foreign DNA has been inserted into a vector

molecule are called

A) Foreign DNA

B) DNA chimaeras

C) Target DNA

D) Passenger DNA

Ans: B) DNA chimaeras


16. In 1970, an enzyme for cutting the DNA was discovered from the bacterium

A) Haemophilous influenzae

 B) Escherichia coli

C) Methanosarcina

D) Helicobacter pylori

Ans: A) Haemophilous influenzae


17. Bidder’s canal is present in kidney of

A) Frog B) Crocodile C) Tortoise D) Snake

Ans: A) Frog


18. First test tube baby of the world was born on

A) 26th July 1978

B) 26th May 1987

C) 25th July 1978

D) 25th May 1987

Ans:  C) 25th July 1978


19. An instrument used to scan a patients body, by a narrow X-ray beams guided by

computer and thin sections of organs are photographed from several angles


Ans: B) CAT

20. Deficiency of an enzyme beta-D-N-acetyl-hexosaminidase causes

A) Beta-thalassemia

B) Tay Sachs disease

C) Galactosemia

D) Alkaptonuria

Ans: B) Tay Sachs disease


21. 45 + XX in human indicates

A) Patau’s syndrome B) Jacob’s syndrome C) Klinefelter’s syndrome D) Down’s syndrome

Ans: D) Down’s syndrome


22. Warm blooded animals are larger in size in the colder region when compared to


A)     Bergman’s law B) Cope’s law C) Allen’s law D) Dollow’s law

Ans: A) Bergman’s law


23. During glycolysis glucose is phosphorylated into

A) Glucose 6 phosphate

B) Glucose 1-6-diphosphate

C) Fructose 1, 6-diphosphate

D) Fructose 6 phosphate

Ans: A) Glucose 6 phosphate


24. A method used for sequencing whole genomes by breaking the DNA is

A) Shotgun sequencing

B) Western blotting

C) Southern blotting

D) Northern blotting

Ans: A) Shotgun sequencing


25. Chemical degradation of DNA protocol was developed by

A) Sanger B) Miller C) Gilbert D) Maxam-Gilbert

Ans: D) Maxam-Gilbert


26. Bioinformatics as a tool in biological science is the contribution of

A) Richard Stallman

B) Margaret Oakley Dayhoff

C) Stephen Hawking

D) Pearson

Ans: B) Margaret Oakley Dayhoff


27. Most widely used program for comparing the amino acid sequences of different proteins or nucleotide sequences of DNA.




28. The most suitable and efficient language used in bioinformatics


B) Perl and Python



Ans: B) Perl and Python


29. The active swimming organisms living in surface and deeper waters

A) Zooplankton B) Benthos C) Nektons D) Neuston

Ans: C) Nektons


30. The true and complete metamorphosis occurs in

A) Silver fishes

 B) Moths and mosquitos

C) Bed bugs

 D) Cockroach

Ans: B) Moths and mosquitos


31. Wrinkles in old age is due to

A) Collagen fibres B) Actin fibres C) Myosin fibres D) Mucin

Ans: A) Collagen fibres


32. Muscle glycogen cannot be converted into glucose due to the absence of an enzyme

A) Arginase

B) Glucose-6-phosphatase

C) Glucose phosphatase

D) Fructase

Ans: B) Glucose-6-phosphatase


33. Minimum turnover number of an enzyme is, for

A) Lysozyme B) Carbonic anhydrase C) DNA polymerase D) Sucrase

Ans: A) Lysozyme


34. The direct cleavage of covalent bonds and removal of groups without addition of H2O

is a characteristic of

A)     Lyases B) Ligases C) Amylase D) Lactase

Ans: Lyases


35. The technique used for opening partially blocked coronary vessels before they become

totally occluded

A)     Angiogram B) EEG C) Angioplasty D) ECG

Ans: C) Angioplasty


36. Thrombosis in which coronary artery is related most frequently in myocardial infraction

A) Left coronary artery

B) Right coronary artery

C) Left pulmonary artery

D) Right pulmonary artery

Ans: A) Left coronary artery


37. Glands of swammerdams is associated with

A) Reproductive system

 B) Nervous system

C) Circulatory system

D) Muscular system

Ans: B) Nervous system


38. Leydig cells are meant for the production of

A) Testosterone B) Progesterone C) Oestrogen D) Aldosteron

Ans: A) Testosterone


39. During polymerization the mismatched residues at the primer terminus is removed and

the accuracy of DNA replication is done by

A) Exonuclease

B) DNA polymerase II

C) DNA polymerase III

D) DNA polymerase I

Ans: D) DNA polymerase I


40. A hormone which stimulate the activity of adenyl cyclase and increases the cAMP level

A) Adrenocorticoid B) Steroid C) Cataecholamines D) Pituitary

Ans: C) Cataecholamines


41. Deficiency of thyroid hormone in adults causes the disease

A) Grave’s disease B) Gull’s disease C) Basidow’s disease D) Addison’s disease

Ans: B) Gull’s disease


42. The activated adenyl cyclase serves as a biochemical amplifier and catalyses the

hydrolysis of ATP to cAMP, in the presence of

A) Na+ and Cl+

B) K+ and Cl+

C) Ca++ K++

D) Ca++ and Mg++

Ans: D) Ca++ and Mg++


43. The ruptured follicle in mammalian ovary after the release of ovum which later gets

fertilized to form

A) Corpus luteum

B) Graafian follicle

C) Corpus callosum

D) Corpus albican

Ans: A) Corpus luteum


44. The Nobel prize in physiology in 1995 for their discovery concerned with the genetic

control of early embryonic development was for

A) Nusslein and Wieschaus

B) Wolpert

C) Jacob and Monord

D) Lewies

Ans: A) Nusslein and Wieschaus


45. Homeotic genes of Drosophila include a 180-nucleotide sequence called the

A) Torpido B) Homoeodomine C) Spatzal D) Homeobox

Ans: D) Homeobox


46. Oxygen is directly used during

A) Fermentation

B) Krebs citric acid cycle

C) Biomethanisation

D) Glycolysis

Ans: B) Krebs citric acid cycle


47. Dissolved oxygen needed for microbes is measured by


Ans: B) BOD


48. A mutant strain of neurospora which falls to grow on a minimal medium unless

supplemented with a nutrient is called

A) Auxotrop B) Mixotrop C) Paratop D) Holotrop

Ans: A) Auxotrop


49. First Indian Scientist who got Nobel prize for deciphering the genetic code

A) Amartyasen

B) Venkatraman Ramakrishnan

C) C. V. Raman

D) Khorana

Ans: D) Khorana


50. The part of an antigen that is recognised by the immune system, specifically by

antibodies, B cells or T cells

A) Antigens

 B) Epitopes

C) Haptens

D) None of the above

Ans: B) Epitopes


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