Bihar Board 12th Chemistry Objective Questions and Answers

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 1.
The general formula of carbohydrates is
(a) CnH2n+1O
(b) CnH2nO
(c) Cn(H2O)n
(d) Cn(H2O)2n
Answer:
(c) Cn(H2O)n

Question 2.
Which of the following compounds is found abundantly in nature ?
(a) Fructose
(b) Starch
(c) Glucose
(d) Cellulose
Answer:
(d) Cellulose

Question 3.
Cellulose is a
(a) hexapolysaccharide
(b) pentapolysaccharide
(c) tripolysaccharide
(d) none of these
Answer:
(d) none of these

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 4.
Which of the following is a non-reducing sugar ?
(a) Glucose
(b) Sucrose
(c) Maltose
(d) Lactose
Answer:
(b) Sucrose

Question 5.
Which of the following is an example of an aldopentose ?
(a) D-Ribose
(b) Glyceraldehyde
(c) Fructose
(d) Erythrose
Answer:
(a) D-Ribose

Question 6.
Which of the following treatment will convert starch directly into glucose ?
(a) Heating with dilute H2SO4
(b) Fermentation by diastase
(c) Fermentation by zymase
(d) Heating with dilute NaOH
Answer:
(a) Heating with dilute H2SO4

Question 7.
Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules 1
Identify Z
(a) 2-Iodoheptane
(b) Heptane-2-ol
(c) 2-Iodohexane
(d) Heptanoic acid
Answer:
(d) Heptanoic acid

Question 8.
On oxidation with a mild oxidising agent like Br2/H2O, the glucose is oxidised to
(a) saccharic acid
(b) glucaric acid
(c) gluconic acid
(d) valeric acid
Answer:
(c) gluconic acid

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 9.
During acetylation of glucose it needs x moles of acetic anhydride. The value of x would be
(a) 3
(b) 5
(c) 4
(d) 1
Answer:
(b) 5

Question 10.
The letter ‘D’ in carbohydrates signifies
(a) dextrorotatory
(b) configuration
(c) diamagnetic nature
(d) mode of synthesis
Answer:
(b) configuration

Question 11.
The anomeric carbon in D(+) glucose is
(a) C-1 carbon
(b) C-2 carbon
(c) C-5 carbon
(d) C-6 carbon
Answer:
(a) C-1 carbon

Question 12.
The α-and β-forms of glucose are
(a) isomers of D(+) glucose and L(-) glucose respectively
(b) diastereomers of glucose
(c) anomers of glucose
(d) isomers which differ in the configuration of C-2
Answer:
(c) anomers of glucose

Question 13.
How many C-atoms are there in a pyranose ring ?
(a) 3
(b) 5
(c) 6
(d) 7
Answer:
(c) 6

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 14.
Among the naturally occurring carbohydrates, furanose ring is found in the ……
(a) glucose unit of cane sugar
(b) glucose unit of cellulose
(c) fructose unit of cane sugar
(d) galactose unit of lactose
Answer:
(c) fructose unit of cane sugar

Question 15.
Which one of the following sets of monosaccharides forms sucrose ?
(a) α-D-galactopyranose and α-D-glucopyranose
(b) α-D-glucopyranose and β-D-fructofuranose
(c) β-D-glucopyranose and α-D-fructofuranose
(d) α-D-glucopyranose and β-D-fructopyranose
Answer:
(b) α-D-glucopyranose and β-D-fructofuranose

Question 16.
What are the hydrolysis products of sucrose ?
(a) Fructose + Fructose
(b) Glucose + Glucose
(c) Glucose + Galactose
(d) Glucose + Fructose
Answer:
(d) Glucose + Fructose

Question 17.
Glycosidic linkage is an
(a) amide linkage
(b) ester linkage
(c) ether linkage
(d) acetyl linkage
Answer:
(c) ether linkage

Question 18.
Invert sugar is
(a) a type of cane sugar
(b) optically incative form of sugar
(c) mixture of glucose and galactose
(d) mixture of glucose and fructose in equimolar quantities
Answer:
(d) mixture of glucose and fructose in equimolar quantities

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 19.
Maltose is made up of
(a) two α – D- glucose
(b) normal β – D – glucose
(c) α – and b – D-glucose
(d) fructose
Answer:
(a) two α – D- glucose

Question 20.
The glycosidic linkage involved in linking the glucose units in amylose part of starch is
(a) CrC4 β – linkage
(b) CrC6 β – linkage
(c) CrC6 α – linkage
(d) CrC4 α – linkage
Answer:
(d) CrC4 α – linkage

Question 21.
What is the basic formula for starch ?
(a) (C6H12O6)n
(b) (C6H10O5)n
(c) C12H22O11
(d) (C6Hl2O4)n
Answer:
(b) (C6H10O5)n

Question 22.
Starch is composed of two polysaccharides which are
(a) amylopectin and glycogen
(b) amylose and glycogen
(c) amylose and maylopectin
(d) cellulose and glycogen
Answer:
(c) amylose and maylopectin

Question 23.
Carbohydrates are stored in human body as the polysaccharide
(a) starch
(b) glycogen
(c) cellulose
(d) amylose
Answer:
(b) glycogen

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 24.
Which one of the amino acids can be synthesised in the body ?
(a) Alanine
(b) Lysine
(c) Valine
(d) Histidine
Answer:
(a) Alanine

Question 25.
The a-amino acid which contains the aromatic side chain is
(a) proline
(b) tyrosine
(c) valine
(d) serine
Answer:
(b) tyrosine

Question 26.
The number of amino acids found in proteins that a human body can synthesise is
(a) 20
(b) 25
(c) 10
(d) 100
Answer:
(a) 20

Question 27.
Which of the following is basic amino acid ?
(a) Lysine
(b) Proline
(c) Alanine
(d) Aspartic acid
Answer:
(a) Lysine

Question 28.
Which of the following is an acidic amino acid ?
(a) Glycine
(b) Valine
(c) Leucine
(d) Glutamic acid
Answer:
(d) Glutamic acid

Question 29.
Amino acids generally exist in the form of Zwitter 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

Question 30.
Proteins are condensation polymers of
(a) α – amino acids
(b) β – amino acids
(c) α -hydroxy acids
(d) β – hydroxy acids
Answer:
(a) α – amino acids

Question 31.
In fibrous proteins, polypeptide chains are held together by
(a) van der waals forces
(b) electrostatic forces of attraction
(c) hydrogen bonds
(d) covalent bonds
Answer:
(c) hydrogen bonds

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 32.
Keratin, a structural protein is present in
(a) hair
(b) wool
(c) silk
(d) all of these
Answer:
(c) silk

Question 33.
Globular proteins are present in
(a) blood
(b) eggs
(c) milk
(d) all of these
Answer:
(d) all of these

Question 34.
Secondary structure of protein refers to
(a) sequence of amino acids in polypeptide chain
(b) bonds between alternate polypeptide chains
(c) folding patterns of polypeptide chain
(d) bonding between NH+3 and COO of two peptides
Answer:
(c) folding patterns of polypeptide chain

Question 35.
Helical structure of protein is stabilised by
(a) peptide bond
(b) hydrogen bond
(c) van der Waals force
(d) dipole association
Answer:
(b) hydrogen bond

Question 36.
Denaturation of protein leads to loss of its biological activity by
(a) formation of amino acids
(b) loss of primary structure
(c) loss of both primary and secondary structure
(d) loss of both secondary and tertiary structures
Answer:
(d) loss of both secondary and tertiary structures

Question 37.
Enzymes are made up of
(a) edible proteins
(b) proteins with specific structure
(c) nitrogen containing carbohydrates
(d) carbohydrates
Answer:
(b) proteins with specific structure

Question 38.
The conversion of maltose into glucose is possible by the enzyme
(a) zymase
(b) lactase
(c) maltase
(d) diastse
Answer:
(c) maltase

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 39.
Which is a fat soluble vitamin ?
(a) Vitamin A
(b) Vitamin B3
(c) Vitamin C
(d) Vitamin B2
Answer:
(a) Vitamin A

Question 40.
Vitamin B2, a water soluble vitamin is also known as
(a) ascorbic acid
(b) riboflavin
(c) thiamine
(d) pyridoxine
Answer:
(b) riboflavin

Question 41.
Which of the following vitamin is water soluble ?
(a) Vitamin E
(b) Vitamin D
(c) Riboflavin
(d) Retinol
Answer:
(c) Riboflavin

Question 42.
Vitamin A is present in
(a) fish liver oil
(b) milk
(c) butter
(d) all of these
Answer:
(d) all of these

Question 43.
Vegetable oils like wheat germ oil, sunflower oil, etc. are the good source of
(a) vitamin K
(b) vitamin E
(c) vitamin D
(d) vitamin A
Answer:
(b) vitamin E

Question 44.
Deficiency of vitamin E causes
(a) rickets
(b) scurvy
(c) muscular weakness
(d) beri beri
Answer:
(c) muscular weakness

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 45.
Which of the following disease is not correctly matched with the vitamins mentioned with it ?
(a) Vitamin B2 – Cracking of lips
(b) Vitamin C – Bone deformities
(c) Vitamin D – Osteomalacia
(d) Vitamin A – Night blindness
Answer:
(b) Vitamin C – Bone deformities

Question 46.
Hereditary characteristic are passed on from parents to children through
(a) gametes
(b) genes
(c) mutants
(d) enzymes
Answer:
(b) genes

Question 47.
Nucleic acids are
(a) small molecules
(b) dipeptides
(c) long chain polymers of nucleotides
(d) polypeptides|
Answer:
(c) long chain polymers of nucleotides

Question 48.
Which of the following is not produced by  human body ?
(a) Enzymes
(b) Vitamins
(c) Proteins
(d) Nucleic acid
Answer:
(b) Vitamins

Question 49.
A nucleoside on hydrolysis gives
(a) an aldopentose and a nitrogeneous base
(b) an aldopentose and phosphoric acid
(c) an aldopentose, nitrogenous base and phosphoric acid
(d) a nitrogeneous base and phosphoric acid
Answer:
(a) an aldopentose and a nitrogeneous base

Question 50.
Thymine is
(a) 5-methyluracil
(b) 4-methyluracil
(c) 3-methyluracil
(d) 1-methyluracil
Answer:
(a) 5-methyluracil

Question 51.
Guanine is an example of
(a) a nitrogenous base
(b) a nucleoside
(c) a nucleotide
(d) phosphate
Answer:
(a) a nitrogenous base

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 52.
Bases common to RNA and DNA are
(a) adenine, guanine, cytosine
(b) adenine, uracil, cytosine
(c) adenine, guanine, thymine
(d) guanine, uracil, thymine
Answer:
(a) adenine, guanine, cytosine

Question 53.
Which one of the following bases is not present in DNA ?
(a) Thymine
(b) Quinoline
(c) Adenine
(d) Cytosine
Answer:
(b) Quinoline

Question 54.
A unit in nucleic acid which contains ‘base-sugar phosphate’ unit is called
(a) nucleotide
(b) nucleoside
(c) phosphotide
(d)  polypeptide
Answer:
(a) nucleotide

Question 55.
RNA is a
(a) single helix strand
(b) double helix strand
(c) right hand twisted double helix strand
(d) triple helix strand
Answer:
(a) single helix strand

Question 56.
If one strand of DNA has the sequence ATGCTTGA, the sequence in the complimentary strand would be
(a) TCCG A ACT
(b) TACGTAGT
(c) TACGAATC
(d) TACGAACT
Answer:
(d) TACGAACT

Question 57.
The two main differences between RNA and DNA are
(a) ribose sugar and thymine in RNA
(b) deoxyribose sugar and uracil in DNA
(c) ribose sugar and uracil in RNA
(d) deoxyribose sugar and guanine in DNA
Answer:
(c) ribose sugar and uracil in RNA

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 58.
The double strand helix structure of DNA was proposed by
(a) Har Gobined Khorana
(b) Watson and Crick
(c) R. Todd
(d) G.W. Kenner
Answer:
(b) Watson and Crick

Question 59.
Maximum amount of RNA is found in
(a) nucleolus
(b) chloroplast
(c) ribosomes
(d) cytoplasm
Answer:
(a) nucleolus

Question 60.
When adenine is attached to ribose sugar, it is called adenosine. To make a nucleotide from it, it would require
(a) oxygenation
(b) addition of a base
(c) addition of phosphate
(d) hydrogenation
Answer:
(c) addition of phosphate

Question 61.
The hydrogen bonding for the bases pairs of DNA are between
(a) amide carbonyl and – NH7 only
(b) amide N- H and cyclic amine nitrogen only
(c) alcohols and carbonyls only
(d) both (a) and (b)
Answer:
(d) both (a) and (b)

Question 62.
Genetic code determines
(a) sequence of amino acids in a peptide chain
(b) sequence of variable amino acids in a protein chain
(c) structure of human cells
(d) morphology of traits
Answer:
(a) sequence of amino acids in a peptide chain

Question 63.
Which of the following polymers is stored in the liver of animals ?
(a) Amylose
(b) Cellulose
(c) Amylopectin
(d) Glycogen
Answer:
(d) Glycogen

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 64.
Sucrose (cane sugar) is a disaccharide. One molecule of sucrose on hydrolysis gives…………………
(a) 2 molecules of glucose
(b) 2 molecules of glucose + 1 molecule of fructose
(c) 1 molecule of glucose + 1 molecule of fructose
(d) 2 molecules of fructose
Answer:
(c) 1 molecule of glucose + 1 molecule of fructose

Question 65.
Nucleic acids are the polymers of……………….
(a) nucleosides
(b) nucleotides
(c) bases
(d) sugars
Answer:
(b) nucleotides

Question 66.
Which of the following statements is not true about glucose ?
(a) It is an aldohexose
(b) On heating with HI it forms n-hexane
(c) It is present in furanose form
(d) It does not give 2,4-DNP test
Answer:
(c) It is present in furanose form

Question 67.
DNA and RNA contain four bases each. Which of the following bases is not present in RNA ?
(a) Adenine
(b) Uracil
(c) Thymine
(d) Cytosine
Answer:
(c) Thymine

Bihar Board 12th Chemistry Objective Answers Chapter 14 Biomolecules

Question 68.
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

Question 69.
Which of the following bases is not present in DNA ?
(a) Adenine
(b) Thymine
(c) Cytosine
(d) Uracil
Answer:
(d) Uracil