TN 12th Standard Chemistry Biomolecules Creative Questions Study Material - QB365 Set A | QB365

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Published on: 28/11/2025

Question Set A

TN 12th Standard Chemistry Biomolecules Creative Questions Study Material - QB365

Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

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Std: 12th Standard - Chemistry

chapter: Biomolecules - Creative Questions

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Questions:

Multiple Choice Question

30 x 1 = 30

The pyrimidine bases present in RNA are :

(a)

Cytosine and Thiamine

(b)

Cytosine and Adenine

(c)

Cytosine and Uracil

(d)

Cytosine and Guanine

The DNA finger print can be extracted from traces of samples from

(a)

Blood

(b)

Saliva

(c)

Hair

(d)

All the above

Which one of the following is incorrectly matched?

(a)

Tollen's Reagent - AgNO₂ + NH₄OH

(b)

Fehlings solution - CuSO₄ + Rochelle salt

(c)

Benedict's solution - CuSO₄ + Sodium citrate + NaOH

(d)

Baeyer's Reagent - Con HCl + anhydrous ZnCl₂

Which of the following statement is incorrect?

(a)

Nucleoside + Phosphate - Nucleotide

(b)

Nucleoside + Base - Nucleotide

(c)

Sugar + Base - Nucleoside

(d)

nNucleotide - Polynucleotide

Which among the following bases in not found in RNA?

(a)

cytosine

(b)

guanine

(c)

uracil

(d)

thymine

An example of a fatty acid obtained from a cooking oil is

(a)

acetic acid

(b)

stearic acid

(c)

benzoic acid

(d)

oxalic acid

Which of the following amino acids are achiral?

(a)

Alanine

(b)

Leucine

(c)

Proline

(d)

Glycine

Which of the following are epimers?

(a)

D(+)-Glucose and D(+)-Galactose

(b)

D(+)-Glucose and D(+)-Mannose

(c)

Neither (a) nor (b)

(d)

Both (a) and (b)

α -D (+) Glucose and β-D (+) glucose are ______.

(a)

Epimers

(b)

Anomers

(c)

Enantiomers

(d)

Conformational isomers

10.

Insulin, a hormone chemically is ______.

(a)

Fat

(b)

Steroid

(c)

Protein

(d)

Carbohydrates

11.

If one strand of the DNA has the sequence ‘ATGCTTGA’, then the sequence of complementary strand would be ______.

(a)

TACGAACT

(b)

TCCGAACT

(c)

TACGTACT

(d)

TACGRAGT

12.

Glucose is an aldose. Which one of the following reactions is not expected with glucose?

(a)

It does not form oxime

(b)

It does not react with Grignard reagent

(c)

It does not form osazones

(d)

It does not reduce tollens reagent

13.

Which of the following statement is correct?

(a)

Ovalbumin is a simple food reserve in egg-white

(b)

Blood proteins thrombin and fibrinogen are involved in blood clotting

(c)

Denaturation makes protein more active

(d)

Insulin maintains the sugar level of in the human body

14.

Complete hydrolysis of cellulose gives ______.

(a)

L-Glucose

(b)

D-Fructose

(c)

D-Ribose

(d)

D-Glucose

15.

Which of the following vitamins is water soluble?

(a)

Vitamin E

(b)

Vitamin K

(c)

Vitamin A

(d)

Vitamin B

16.

The secondary structure of a protein refers to ______.

(a)

fixed configuration of the polypeptide backbone

(b)

hydrophobic interaction

(c)

sequence of α-amino acids

(d)

\(\alpha-\)helical backbone.

17.

Among the following L- serine is ______.

(a)

(b)

(c)

(d)

18.

The pyrimidine bases present in DNA are ______.

(a)

Cytosine and Adenine

(b)

Cytosine and Guanine

(c)

Cytosine and Thiamine

(d)

Cytosine and Uracil

19.

Vitamin B₂ is also known as ______.

(a)

Riboflavin

(b)

Thiamine

(c)

Nicotinamide

(d)

Pyridoxine

20.

The number of sp² and sp³ hybridised carbon in fructose are respectively ______.

(a)

1 and 4

(b)

4 and 2

(c)

5 and 1

(d)

1 and 5

21.

Which one of the following is not produced by body?

(a)

DNA

(b)

Enzymes

(c)

Hormones

(d)

Vitamins

22.

In aqueous solution of amino acids mostly exists in ______.

(a)

NH₂-CH(R)-COOH

(b)

NH₂-CH(R)-COO^-

(c)

H₃N⁺-CH(R)-COOH

(d)

H₃N⁺-CH(R)-COO^-

23.

The correct statement regarding RNA and DNA respectively is ______.

(a)

the sugar component in RNA is an arabinos and the sugar component in DNA is ribose

(b)

the sugar component in RNA is 2’-deoxyribose and the sugar component in DNA is arabinose

(c)

the sugar component in RNA is an arabinose and the sugar component in DNA is 2’-deoxyribose

(d)

the sugar component in RNA is ribose and the sugar component in DNA is 2’-deoxyribose

24.

Among the following the achiral amino acid is ______.

(a)

2-ethylalanine

(b)

2-methylglycine

(c)

2-hydroxymethylserine

(d)

Tryptophan

25.

In a protein, various amino acids linked together by ______.

(a)

Peptide bond

(b)

Dative bond

(c)

\(\alpha\) - Glycosidic bond

(d)

\(\beta\) - Glycosidic bond

26.

The central dogma of molecular genetics states that the genetic information flows from______.

(a)

Amino acids Protein DNA

(b)

DNA Carbohydrates Proteins

(c)

DNA RNA Proteins

(d)

DNA RNA Carbohydrates

27.

\(\text { Glucose } \stackrel{(\mathrm{HCN})}{\longrightarrow} \text { Product } \stackrel{(\text { hydrolysis })}{\longrightarrow} \text { Product } \stackrel{(\mathrm{HI}+\text { Heat })}{\longrightarrow} \mathrm{A}\) , the compound A is______.

(a)

Heptanoic acid

(b)

2-Iodohexane

(c)

Heptane

(d)

Heptanol

28.

Which one given below is a non-reducing sugar?

(a)

Glucose