TN 11th Question Paper 2026 Biochemistry

FOR TN 11TH EXAM PREPARATION

TN 11th 2026
Question Paper ·
Biochemistry
EXAM YEAR TYPE SUBJECT

TN 11th 2026 Question Paper Biochemistry

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 8
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!9163IstYearBiochemistry! £vÄ Gs
Register Number

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PART - III
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Time Allowed : 3.00 Hours ] [ Maximum Marks : 70

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Instructions : (1) Check the question paper for fairness of printing. If there is any lack of fairness,

inform the Hall Supervisor immediately.

(2) Use Blue or Black ink to write and underline and pencil to draw diagrams.

(3) Draw diagrams and write equations wherever necessary.

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Note : (i) Answer all the questions.

(ii) Choose the most appropriate answer from the given four alternatives and write

the option code and the corresponding answer.

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1. pH AÍÃmiß GÀø» :
(A) 0 •uÀ 7 Áøµ (B) 1 •uÀ 14 Áøµ
(C) 1 •uÀ 7 Áøµ (D) 0 •uÀ 14 Áøµ
The range of pH scale is :

(a) 0 to 7 (b) 1 to 14

(c) 1 to 7 (d) 0 to 14

2. G¾®¦UTk Aø©¨¦ E¸ÁõUPzvÀ •UQ¯ £[S ÁQUQßÓx.
__________

(A) ø©m÷hõPõsm›¯õ (B) ÷PõÀâ EÖ¨¦PÒ
(C) Gs÷hõ¤Íõ\ Áø»¨¤ßÚÀ (D) øµ÷£õ÷\õ®PÒ
__________ plays a vital role in the formation of the skeletal framework.

(a) Mitochondria (b) Golgi Apparatus

(c) Endoplasmic Reticulum (d) Ribosomes

3. »õU÷hõ_ GuÚõÀ BUP¨£mhx ?
(A) ›÷£õì ©ØÖ® ›¦÷»õì
(B) SÐU÷Põì ©ØÖ® ©õ÷Úõì
(C) SÐU÷Põì ©ØÖ® Põ»U÷hõì
(D) ¤µU÷hõì ©ØÖ® SÐU÷Põì
Lactose is made up of :

(a) Ribose and Ribulose

(b) Glucose and Mannose

(c) Glucose and Galactose

(d) Fructose and Glucose

4. α_¸Ò Aø©¨¤À JÆöÁõ¸ ÁøÍÄ® __________ Aª÷Úõ Aª»[PøÍ
ö£ØÖÒÍÚ.
(A) 3.9 (B) (C) 3.6 3.5 (D) 3.7

Each turn of an α-helix contains __________ amino acids.

(a) 3.9 (b) 3.6 (c) 3.5 (d) 3.7

5. ö|õv CµzuU SÇÀ Cµzu PmiPøÍ PøµUP £¯ß£kzu¨£kQÓx.
__________

(A) ³›÷Pì (B) ìmöµ¨÷hõøP÷Úì
(C) öPõÀ»õâ÷Úì (D) ø»÷\õø\®
__________ is used to lyse intravascular blood clots.

(a) Uricase (b) Streptokinase

(c) Collagenase (d) Lysozyme

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 2 of 8

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6. __________ SÐU÷Põì ©ØÖ® BÀPíõÀ u¯õ›zu¼À £¯ß£kQÓx.
(A) QøÍ÷Põáß (B) ö\À¾÷»õì (C) CÝ¼ß (D) ìhõºa
__________ is used for the manufacture of glucose and alcohol.

(a) Glycogen (b) Cellulose (c) Inulin (d) Starch

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Polenske number indicates the __________ fatty acids in the fat.

(a) Saturated (b) Volatile

(c) Unsaturated (d) Non-volatile

8. öPõʨø£ __________ öPõsk }µõØ£SUS®÷£õx ÷\õ¨¦ E¸ÁõQÓx.
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(A) Rm÷hõß (B) Aª»® (C) Duº (D) Põµ®

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Hydrolysis of fat with __________ yields soap.

(a) Ketone (b) Acid

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9. B-DNA &ß Âmh AÍÄ __________ nm.

(A) 10 (B) 2 (C) 34 (D) 20

The diameter of B-DNA is __________ nm.

(a) 10 (b) 2 (c) 34 (d) 20

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10. öÁ¨£{ø»ø¯ £øǯ {ø»ø©US SøÓzx, C¯À¤Ç¢u Âß Cµmøh DNA -

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Forming of double stranded DNA on bringing back the temperature of Denatured DNA is

called as :

(a) Melting (b) Rejoining

(c) Annealing (d) Denaturation

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11. ¤ßÁ¸® G¢u ö|õv°ß ö\¯À£õmiØS u¯ªß ø£÷µõ£õì÷£m ÷uøÁ¨
£kQÓx ?
(A) iµõßìBÀ÷hõ÷»ì (B) öíU÷éõøP÷Úì
(C) SÐU÷Põì £õì£÷hì (D) iµõßìRm÷hõ÷»ì
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Thiamine pyrophosphate is required for the following enzymatic activity :

(a) Transaldolase (b) Hexokinase

(c) Glucose-6-phosphatase (d) Transketolase

12. øÁmhªß SøÓ£õmhõÀ EshõS® ÷|õ´ :
B12

(A) B£zuõÚ Cµzu ÷\õøP (B) ìPºÂ
(C) ö£›ö£› (D) ›UPmì
A deficiency of Vitamin B12 causes :

(a) Pernicious anemia (b) Scurvy

(c) Beri Beri (d) Rickets

13. SÐmhõøu÷¯õß ö£µõUê÷hì öPõskÒÍx :
(A) ö\¼Û¯® (B) PõÀ]¯® (C) S÷µõª¯® (D) C¸®¦
Glutathione peroxidase contains :

(a) Selenium (b) Calcium (c) Chromium (d) Iron

14. ¤ßÁ¸ÁÚÁØÖÒ ø©U÷µõ uÛ©®, ¦s BØÖu¼À £[S ö£ÖQÓx.
__________

(A) xzu|õP® (B) C¸®¦ (C) ö\¼Û¯® (D) Põ¨£º
In wound healing, the following trace element is involved :

(a) Zinc (b) Iron (c) Selenium (d) Copper

15. ÷ÁÖ£õmk ø©¯Â»US •øÓ°À £¯ß£k® ö£õxÁõÚ ÷ÁÖ£õmk ö£õ¸Ò :
(A) £õ¼AU›»ø©k (B) _U÷µõì
(C) APõº (D) ©õÀ÷hõì
A Gradient commonly used in differential centrifugation is :

(a) Polyacrylamide (b) Sucrose

(c) Agar (d) Maltose

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 4 of 8

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£Sv & II / PART - II

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 24 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x2=12

Note : Answer any six questions. Question No. 24 is compulsory.

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16. Gs÷hõ¤Íõ\ Áø»¨¤ßÚ¼ß ÁøPPÎß ö£¯ºPøÍ GÊxP.
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Name the types of Endoplasmic reticulum.

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17.
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What are glycolipids ?

18. ö£¨øhk ¤øn¨¦PÒ GßÓõÀ GßÚ ?
What are peptide bonds ?

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19. ö|õv ÂøÚPÐUS H÷uÝ® Cµsk GkzxUPõmkPÒ u¸P.

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Give any two examples for an enzymatic reaction.

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GßÚ ?
What is the structural difference between glycogen and starch ?

21. A÷¯õiß Gs GßÓõÀ GßÚ ?
What is Iodine number ?

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Name the common bases present in Nucleic acids.

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Write a note on deficiency symptoms of Manganese.

24. H÷uÝ® Cµsk ¤›hõUêß ÁȨö£õ¸mPÎß ö£¯ºPøÍ GÊxP.
Name any two important derivatives of Pyridoxine.

[ v¸¨¦P / Turn over

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£Sv & III / PART - III

SÔ¨¦ : H÷uÝ® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 33 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x3=18

Note : Answer any six questions. Question No. 33 is compulsory.

25. ö»]vß ÁiÁø©¨ø£ u¸P.
Give structure for lecithin.

26. Gx Pvº A›ÁõÒ Cµzu Aqa÷\õøP ÷|õø¯ E¸ÁõUSQÓx ?
What causes Sickle Cell Anemia ?

27. ÷£õmi ußø©²ÒÍ ukzuÀ ©ØÖ® ÷£õmiz vÓÚØÓ ukzuÀ J¨¤kP.
(H÷uÝ® ‰ßÖ)
Compare competitive and non-competitive inhibition. (any three)

28. öPõʨ¤ß øímµá÷ÚØÓzøu £ØÔ ]Ö SÔ¨¦ ÁøµP.
Write a short note on hydrogenation of fat.

29. DNA - Âß ö\¯À£õkPøͨ £mi¯¼kP.
List down the functions of DNA.

30. øÁmhªß B3 &°ß E°º÷Áva ö\¯ÀPøÍ TÖP.
State the biochemical functions of Vitamin B3.

31. PõÀ]¯® SøÓ£õmk {ø»PøÍz u¸P.
Give the deficiency states of Calcium.

32. {Ó©õÛ°ß £¯ß£õkPÒ ¯õøÁ ?
What are the applications of colorimeter ?

33. uõ[PÀ Pøµ\ÀPÎß H÷uÝ® ‰ßÖ £¯ßPøÍ £mi¯¼kP.
List out any three uses of buffers.

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 6 of 8

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£Sv & IV / PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25

Note : Answer all the questions.

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34. (A) öíshº\ß&÷í\À£õU Âvø¯ TÔ AuØPõÚ \©ß£õmøh Á¸Â.
s e
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(B) S÷Íõ¦»º ag
(a)
aState and derive Henderson - Hasselbalch equation.

OR

(b) Explain the structure of Globular proteins with an example.

35. (A) ¦µu[PÎß ÷ÁÖ£mh ö\¯À£õkPøÍ ÂÍUSP.
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(a) Explain the functional diversity of proteins.

OR

(b) Describe the different medical applications of enzymes.

36. (A) (i) Gº÷PõìöhµõÀ £ØÔ ]Ö SÔ¨¦ ÁøµP.
(ii) ìiU©õìöhµõÀ £ØÔ ]Ö SÔ¨¦ ÁøµP.
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AÀ»x
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DNA -
s e
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a (a) (i) Write a short note on ergosterol.

(ii) Write a short note on stigmasterol.

OR

(b) Draw a neat labelled diagram and explain the salient features of Watson-Crick Structure

of DNA. (any 5)

[ v¸¨¦P / Turn over

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37. (A) _U÷µõì, »õU÷hõì ©ØÖ® ©õÀ÷hõì BQ¯ÁØÔØQøh÷¯¯õÚ
÷ÁÖ£õkPøÍ GÊxP.
AÀ»x
(B) ÷\õi¯zvß ö\¯À£õkPøÍ u¸P.
(a) Write the difference between sucrose, lactose and maltose.

OR

(b) Give the functions of Sodium.

38. (A) øÁmhªß K - ß ö\¯À£õkPÒ ©ØÖ® SøÓ£õmk ÷|õ´ AÔSÔPøÍ £ØÔ
ÂÍUSP.
AÀ»x
(B) ø©¯Â»US •øÓ°À £¯ß£kzu¨£k® £À÷ÁÖ _ǼPÎß ÁøPPøÍ
ÂÁ›UPÄ®.
(a) Explain about the functions and deficiency symptoms of Vitamin K.

OR

(b) Describe the various types of rotors used in centrifugation.

- o O o -

For more Question Papers, Sample Papers, Notes & Syllabus visit Page 8 of 8