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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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