Class 12 Chemistry MCQs Biomolecules for JEE/NEET

Here, you will get Class 12 Chemistry MCQ of Chapter 14 Biomolecules for cracking JEE and NEET/AIIMS. By solving these MCQs of Class 12 Chemistry Chapter 14 Biomolecules, you will get the confidence to crack JEE or NEET. Practice MCQ Questions for Class 12 Chemistry with Answers on a daily basis and score well in exams. 

Biomolecules 12 MCQs Questions with Answers

On oxidation with a mild oxidising agent like Br2/H20, the glucose is oxidized to
(a) saccharic acid
(b) glucaric acid
(c) gluconic acid
(d) valeric acid

Answer: (c) gluconic acid

Glycosidic linkage is an
(a) amide linkage
(b) ester linkage
(c) ether linkage
(d) acetyl linkage

Answer: (c) ether linkage

Maltose is made up of
(a) two α-D-glucose
(b) normal β-D-glucose
(c) α- and β-D-glucose
(d) fructose

Answer: (a) two α-D-glucose

Whicn of the following is an example of an aldopentose?
(a) D-Ribose
(b) Glyceraldehyde
(c) Fructose
(d) Erythrose

Answer: (a) D-Ribose

The functional group which is found in amino acids is
(a) COOH
(b) -NH2
(c) -CH3
(d) both (a) and (b)

Answer: (d) both (a) and (b)

The protein responsible for blood clotting is
(a) Albumins
(b) Globulins
(c) Fibroin
(d) Fibrinogen

Answer: (d) Fibrinogen

Glucose reacts with acetic anhydride to form
(a) Monoacetate
(b) Tetraacetate
(c) Penta-acetate
(d) Hexa-acetate

Answer: (c) Penta-acetate

Which carbohydrates is an essential constituent of plant cells?
(a) Starch
(b) Cellulose
(c) Sucrose
(d) Vitamins

Answer: (b) Cellulose

Which of the following in the sweetest sugar?
(a) Sucrose
(b) Glucose
(c) Fructose
(d) Maltose

Answer: (c) Fructose

The number of chiral carbons in ß-D (+) glucose is
(a) five
(b) six
(c) three
(d) four

Answer: (a) five

The general formula of carbohydrates is
(a) CnH2n+1O
(b) CnH2nO
(c) Cx(H2O)
(d) Cn(H2,O)2n

Answer: (c) Cx(H2O)

The glycosidic linkage involved in linking the glucose units in amylose part of starch is
(a) C1-C4 β-linkage
(b) C4-C6 β-linkage
(c) C1-C6 α-linkage
(d) C1-C4 α-linkage

Answer: (d) C1-C4 α-linkage

Which one of the following is not correct?
(a) D(-) Fructose exist sin furanose structure
(b) D (+) Glucose exists in pyranose structure
(c) In sucrose the two monosaccharides are held together by peptide linkage
(d) Maltose is a reducing sugar

Answer: (c) In sucrose the two monosaccharides are held together by peptide linkage

Proteins are found to have two different types of secondary structures viz. α-helix and β-pleated sheet structure. α-helix structure of protein is stabilised by
(a) Peptide bonds
(b) van der Waals forces
(c) Hydrogen bonds
(d) Dipole-dipole interactions

Answer: (c) Hydrogen bonds

Which of the following acids is a vitamin?
(a) Aspartic acid
(b) Ascorbic acid
(c) Adipic acid
(d) Saccharic acid

Answer: (b) Ascorbic acid

Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be
(a) primary structure of proteins
(b) secondary structure of proteins
(c) tertiary structure of proteins
(d) quaternary structure of protein

Answer: (a) primary structure of proteins

Cellulose is a
(a) hexapolysaccharide
(b) pentapolysaccharide
(c) tripolysaccharide
(d) None of these

Answer: (d) None of these

Which one of the amino acids can be synthesised in the body?
(a) Alanine
(b) Lysine
(c) Valine
(d) Histidine

Answer: (a) Alanine

The cell memberanes are mainly composed of
(a) Phospholipids
(b) Proteins
(c) Fats
(d) Carbohydrates

Answer: (a) Phospholipids

The correct statement for protein haemoglobin
(a) functions as a catalyst for biological reactions
(b) maintains blood sugar level
(c) acts as oxygen carrier in blood
(d) forms antibodies and offers resistance to disease

Answer: (c) acts as oxygen carrier in blood

Complete hydrolysis of cellulose gives
(a) L-glucose
(b) D-fructose
(c) D-ribose
(d) D-glucose

Answer: (d) D-glucose

Which of the following B group vitamins can be stored in our body?
(a) Vitamin B1
(b) Vitamin B2
(c) Vitamin B6
(d) Vitamin B12

Answer: (d) Vitamin B12

Enzymes belong to which class of compounds?
(a) Polysaccharides
(b) Polypeptides
(c) Polynitroheterocyclic components
(d) Hydrocarbon

Answer: (b) Polypeptides

Amino acids generally exist in the form of Z witter ions. This means they contain
(a) Basic – NH2 group and acidic – COOH group
(b) The basic – NH3 group and acidic – COO group
(c) Basic -NH2 and acidic – H+ group
(d) Basic – COO group and acidic – NH3 group

Answer: (d) Basic – COO– group and acidic – NH3 group

A diabetic person carries a packet of glucose with him always, because
(a) glucose increases the blood sugar level slowly
(b) glucose reduces the blood sugar level
(c) glucose increases the blood sugar level almost instantaneously
(d) glucose reduces the blood sugar level slowly

Answer: (c) glucose increases the blood sugar level almost instantaneously

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