Q.1
The two sugars of honey are
  • a) Dextrose and lactose
  • b) Dextrose and Levulose
  • c) Glucose and galactose
  • d) Glucose and fructose
Q.2
Lecithin is a:
  • a) Fat
  • b) Cholesterol
  • c) Phospholipids with choline attached to phosphate group
  • d) Fatty acid
Q.3
All the following are nucleosides except
  • a) Adenosine
  • b) Cytosine
  • c) Guanosine
  • d) Uridine
Q.4
Based on the graph of an enzyme catalyzed reaction, which of the following could be used to increase the reaction rate beyond point C
unit-3_ch-5_que_no-72_img_no1.png
  • a) increase the amount of substrate
  • b) add more water
  • c) increase the temperature
  • d) decrease enzyme concentration
Q.5
Which of the following sugar is not found in plants?
  • a) sucrose
  • b) glucose
  • c) lactose
  • d) fructose
Q.6
The number of carbon atoms in monosaccharide vary from
  • a) 3 to 6
  • b) 2 to 7
  • c) 3 to 7
  • d) 3 to 5
Q.7
From which of the following skin pigment melanin is formed
  • a) Threonine and serine
  • b) Tyrosine and serine
  • c) Tryptophan and phenylalanine
  • d) Phenylalanine and tyrosine
Q.8
Pigments, alkaloids, essential oils, rubber, gum, Terpenoids are called secondary metabolites because:
  • a) Not involved in primary metabolism like photosynthesis, respiration, protein and lipid metabolism.
  • b) No direct role in growth and development.
  • c) They are mostly secretory and excretory products.
  • d) All of the above.
Q.9
All are proteins except;
  • a) Receptor + Insulin.
  • b) Antibody + Trypsin.
  • c) GLUT – 4.
  • d) Inulin.
Q.10
A nucleotide is formed of 95% water. Water present:
  • a) Purine, pyramidine and phosphate.
  • b) Purine, sugar and phosphate.
  • c) Nitrogen base, sugar and phosphate.
  • d) Pyramidine, sugar and phosphate.
Q.11
Sugars which are less sweet and less soluble in water are called
  • a) monosaccharides
  • b) polysaccharide
  • c) oligosaccharides
  • d) disaccharides
Q.12
In a polysaccharide chain like glycogen, the right end is called reducing end since:
  • a) – CHO group is engaged in glycosidic linkage.
  • b) – CHO group is free.
  • c) – CH3 group is engaged in glycosidic linkage.
  • d) – CH3 group may be free.
Q.13
Nicotinamide can be synthesised in human body from:
  • a) Fructose.
  • b) Lactose.
  • c) Tyrosine.
  • d) Tryptophan.
Q.14
From the following group, select the one which has only secondary metabolites?
  • a) Arbrin, cellulose, arginine, tyrosine
  • b) Glycine, gums, serine, diterpenes
  • c) Carotenoids, phenylalanine, curcumin rubber
  • d) Conclavin-A, morphine, codeine, vinblastine
Q.15
Enzyme often have additional parts in their structures that are made up of molecules other than proteins. When this additional chemical part is an organic molecule, it is called
  • a) cofactor
  • b) coenzyme
  • c) substrates
  • d) both (a) and (b)
Q.16
Cellulose is
  • a) Heteropolysaccharide, branched
  • b) Heteropolysaccharide
  • c) Pentosan polysaccharide, branched
  • d) Hexosan polysaccharide, unbranched
Q.17
Point out the alcoholic amino acid pair?
  • a) Tryptophan and phenylalanine
  • b) Phenylalanine and tyrosine
  • c) Tyrosine and serine
  • d) Threonine and serine
Q.18
Coenzymes FMN and FAD are derived from vitamin:
  • a) C
  • b) B1
  • c) B2
  • d) B6
Q.19
Which one of the following pairs is not correctly matched?
  • a) Cotton fibres – cellulose.
  • b) Pyramidine – Adenine.
  • c) Nucleotide – Guanylic acid.
  • d) Amino acids – Zwitter ions.
Q.20
The given graph shows the effect of substrate concentration on the rate of reaction of the enzyme green gram-phosphatise. What does the graph indicate?
unit-3_ch-5_que_no-88_img_no1.png
  • a) The rate of enzyme is directly proportional to the substrate concentration.
  • b) Presence of an enzyme inhibitor in the reaction mixture.
  • c) Formation of enzyme substrate complex.
  • d) At higher substrate concentration, the pH increases.
Q.21
Assertion: coenzymes or metal ions that is very tightly bound to enzyme protein is called prosthetic group. Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.
  • a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
  • b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
  • c) Assertion is true but Reason is false.
  • d) Both Assertion and Reason are false.
Q.22
The vitamin Niacin functions as a coenzyme in:
  • a) Nuceloprotein synthesis
  • b) Hydrogen transport
  • c) Fatty acid synthesis
  • d) RBC production
Q.23
Cotton fibres mainly contains
  • a) cellulose
  • b) glycogen
  • c) protein
  • d) lipid
Q.24
Cut surfaces of fruit and vegetables often become dark because
  • a) dirty knife makes it dark
  • b) oxidation of tannic acid in the presence of trace of iron from the knife makes it dark
  • c) dust of the air makes it dark
  • d) none of the above
Q.25
The sweetest of all naturally occurring sugar is
  • a) Mannose
  • b) Galactose
  • c) Fructose
  • d) Glucose
Q.26
The simplest amino acid -
  • a) Tyrosine
  • b) Alanine
  • c) Asparagine
  • d) Glycine
Q.27
In enzyme pepsin
  • a) Two third of amino acids are working actively as enzyme
  • b) The whole surface of enzyme is active
  • c) Only one amino acid tyrosine of this enzyme is active and rest amino acids are inactive
  • d) Three fourth of the amino acids are working actively as enzyme
Q.28
Erwin Chargaff formula is:
  • a)
    unit-3_ch-5_qn-96choice_img_no1.png
  • b)
    unit-3_ch-5_qn-96choice_img_no2.png
  • c)
    unit-3_ch-5_qn-96choice_img_no3.png
  • d)
    unit-3_ch-5_qn-96choice_img_no4.png
Q.29
Which of the following statement is incorrect?
  • a) According to Chargaff’s rule base ratio (A+T/C+G ) may vary from one species to another but is constant for a given group.
  • b) Keratin is a fibrous protein showing β – helical secondary structure.
  • c) Essential amino acids include Linoleic acid, Linolenic acid and Arachidonic acid.
  • d) Homopolysaccharide includes chitin, starch, glycogen, etc.
Q.30
Which of the following have carbohydrate as prosthetic group?
  • a) Glycoprotein.
  • b) Chromoprotein.
  • c) Lipoprotein
  • d) nucleoprotein.
Q.31
Locomotion is a very important feature in animals. Considering the frequent need for locomotion in animals, an animal would obtain the greatest benefit from storing its energy as
  • a) proteins
  • b) minerals
  • c) carbohydrates
  • d) fats
Q.32
The largest amount of cellulose (90%) amongst the natural material is present in
  • a) Roughage
  • b) Wood
  • c) Cotton fibres
  • d) Rayon
Q.33
Hair keratin has
  • a) β - pleated structure of protein
  • b) α helical structure of protein
  • c) Secondary structure of protein
  • d) Primary structure of protein
Q.34
Tetroses are not very common, they are found rare in nature and in few
  • a) viruses
  • b) bacteria
  • c) plants
  • d) animals
Q.35
Select the number of wrong statements: (i) Starch, glycogen and cellulose are branched homopolymers of glucose. (ii) Cellulose and chitin are fibrous polysaccharides. (iii) Inulin or dahlia starch is a polymer of fructose. (iv) Inulin is the shortest Homopolysaccharide. (v) Chitin present in the exoskeleton of invertebrates is a polymer of N – acetyl glucosamine. (vi) Starch consists of a mixture of amylose and amylopectin. (vii) Cellulose contains complex helical structure and hence can hold iodine. (viii) In a polysaccharide chain, the right left is called the non reducing end and the left end is called the reducing end. (ix) In iodine test starch gives a blue colour because of its helical secondary structure.
  • a) 3
  • b) 4
  • c) 5
  • d) 1
Q.36
Choose the incorrect statement:
  • a) Cholesterol is the most abundant steroid in the animal tissue.
  • b) Arachidonic acid has 20 carbon atoms including the carbonyl carbon.
  • c) Glycerides are esters of fatty acids with glycerol.
  • d) Prostaglandins are derived from steroids.
Q.37
In which one of the following sets of three items each belong to the category mentioned against them?
  • a) Lysine, glycine, thiamine – amino acids
  • b) Myosin, oxytocin and gastrin – hormones
  • c) Rennin, helicase and hyaluronidase – enzymes
  • d) Optic nerve, oculomotor, vagus – sensory nerves
Q.38
Identify the given structure
unit-3_ch-5_que_no-108_img_no1.png
  • a) Adenylic acid
  • b) Uracil
  • c) Cholesterol
  • d) Adenosine
Q.39
Which of the following is a carbohydrate?
  • a) Aleurone
  • b) Inulin
  • c) Cystolith
  • d) Raphide
Q.40
Enzymes have:
  • a) Different pH and different temperature optima
  • b) Different pH but same temperature optima
  • c) Same pH but different temperature optima
  • d) Same pH and temperature optima
Q.41
Which of the following statements are true regarding secondary structure of proteins: (i) Linear polypeptide undergoes folding to give secondary structure. (ii) Hydrogen bonds present. (iii) Two types are present → α helix and β pleated structures.
  • a) Only (i).
  • b) Only (ii).
  • c) (i) and (iii) only.
  • d) (i), (ii) and (iii).
Q.42
Match the following:
Column I Column II
a. Sulphur containing amino acid Methionine
b. Nitrogen containing amino acid Glycine
c. Optically inactive amino acid Chitin
d. Sulphur containing carbohydrate Chondrotin sulphate
  • a) a = 1; b = 2; c = 3; d = 4
  • b) a = 1; b = 4; c = 2; d = 3
  • c) a = 1; b = 3; c = 2; d = 4
  • d) a = 2; b = 3; c = 1; d = 4
Q.43
Derivatives of phosphatidic acid, which are composed of glycerol, fatty acids and phosphoric acids are known as
  • a) phospholipids
  • b) acylghycerols
  • c) triglycerides
  • d) esters
Q.44
Fatty acids which remain in liquid state at room temperature are said to be
  • a) wax
  • b) oil
  • c) fats, glucose, starch
  • d) lipids
Q.45
Which of the following contain β-1,4 linkage?
  • a) Maltose
  • b) Sucrose
  • c) Lactose
  • d) Fructose
Q.46
Identify the incorrect statement regarding the structure of proteins
  • a) They are heteropolymers containing strings of amino acids
  • b) The first amino acid in the primary structure is the N-terminus amino acid
  • c) Only left helices are observed in proteins
  • d) Tertiary structure is absolutely essential for many biological functions of the proteins
Q.47
Which of the following is an essential amino acid?
  • a) Cystine
  • b) Glycine
  • c) Phenylalanine
  • d) Serine
Q.48
Jute fibres deteriorate quickly because
  • a) cellulose content is high
  • b) lignin content is high
  • c) cellulose content is low
  • d) lignin content is low
Q.49
Why sucrose is used instead of glucose to preserve fruit product?
  • a) Sucrose is more common in nature
  • b) Sucrose is easily available and has both glucose and fructose
  • c) Glucose is reactive as it has CHO group
  • d) None of these
Q.50
A bond which is formed between Aldehyde or ketone group of monosaccharide and alcoholic group of another organic compound is known
  • a) Ester bond
  • b) Phosphodiester bond
  • c) Peptide bond
  • d) Glycosidic bond
0 h : 0 m : 1 s