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Quiz 14
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Q.1
The two sugars of honey are
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a) Dextrose and lactose
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b) Dextrose and Levulose
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c) Glucose and galactose
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d) Glucose and fructose
Explanation
Answer:(b)
Q.2
Lecithin is a:
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a) Fat
0%
b) Cholesterol
0%
c) Phospholipids with choline attached to phosphate group
0%
d) Fatty acid
Explanation
Answer:(c)
Q.3
All the following are nucleosides except
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a) Adenosine
0%
b) Cytosine
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c) Guanosine
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d) Uridine
Explanation
Answer:(b)
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
0%
a) increase the amount of substrate
0%
b) add more water
0%
c) increase the temperature
0%
d) decrease enzyme concentration
Explanation
Answer:(c)
Q.5
Which of the following sugar is not found in plants?
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a) sucrose
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b) glucose
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c) lactose
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d) fructose
Explanation
Answer:(c)
Q.6
The number of carbon atoms in monosaccharide vary from
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a) 3 to 6
0%
b) 2 to 7
0%
c) 3 to 7
0%
d) 3 to 5
Explanation
Answer:(c)
Q.7
From which of the following skin pigment melanin is formed
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a) Threonine and serine
0%
b) Tyrosine and serine
0%
c) Tryptophan and phenylalanine
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d) Phenylalanine and tyrosine
Explanation
Answer:(a)
Q.8
Pigments, alkaloids, essential oils, rubber, gum, Terpenoids are called secondary metabolites because:
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a) Not involved in primary metabolism like photosynthesis, respiration, protein and lipid metabolism.
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b) No direct role in growth and development.
0%
c) They are mostly secretory and excretory products.
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d) All of the above.
Explanation
Answer:(d)
Q.9
All are proteins except;
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a) Receptor + Insulin.
0%
b) Antibody + Trypsin.
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c) GLUT – 4.
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d) Inulin.
Explanation
Answer:(d)
Q.10
A nucleotide is formed of 95% water. Water present:
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a) Purine, pyramidine and phosphate.
0%
b) Purine, sugar and phosphate.
0%
c) Nitrogen base, sugar and phosphate.
0%
d) Pyramidine, sugar and phosphate.
Explanation
Answer:(c)
Q.11
Sugars which are less sweet and less soluble in water are called
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a) monosaccharides
0%
b) polysaccharide
0%
c) oligosaccharides
0%
d) disaccharides
Explanation
Answer:(c)
Q.12
In a polysaccharide chain like glycogen, the right end is called reducing end since:
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a) – CHO group is engaged in glycosidic linkage.
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b) – CHO group is free.
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c) – CH3 group is engaged in glycosidic linkage.
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d) – CH3 group may be free.
Explanation
Answer:(b)
Q.13
Nicotinamide can be synthesised in human body from:
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a) Fructose.
0%
b) Lactose.
0%
c) Tyrosine.
0%
d) Tryptophan.
Explanation
Answer:(d)
Q.14
From the following group, select the one which has only secondary metabolites?
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a) Arbrin, cellulose, arginine, tyrosine
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b) Glycine, gums, serine, diterpenes
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c) Carotenoids, phenylalanine, curcumin rubber
0%
d) Conclavin-A, morphine, codeine, vinblastine
Explanation
Answer:(d)
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
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a) cofactor
0%
b) coenzyme
0%
c) substrates
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d) both (a) and (b)
Explanation
Answer:(b)
Q.16
Cellulose is
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a) Heteropolysaccharide, branched
0%
b) Heteropolysaccharide
0%
c) Pentosan polysaccharide, branched
0%
d) Hexosan polysaccharide, unbranched
Explanation
Answer:(d)
Q.17
Point out the alcoholic amino acid pair?
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a) Tryptophan and phenylalanine
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b) Phenylalanine and tyrosine
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c) Tyrosine and serine
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d) Threonine and serine
Explanation
Answer:(d)
Q.18
Coenzymes FMN and FAD are derived from vitamin:
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a) C
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b) B1
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c) B2
0%
d) B6
Explanation
Answer:(c)
Q.19
Which one of the following pairs is not correctly matched?
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a) Cotton fibres – cellulose.
0%
b) Pyramidine – Adenine.
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c) Nucleotide – Guanylic acid.
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d) Amino acids – Zwitter ions.
Explanation
Answer:(b)
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?
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a) The rate of enzyme is directly proportional to the substrate concentration.
0%
b) Presence of an enzyme inhibitor in the reaction mixture.
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c) Formation of enzyme substrate complex.
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d) At higher substrate concentration, the pH increases.
Explanation
Answer:(b)
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.
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
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c) Assertion is true but Reason is false.
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d) Both Assertion and Reason are false.
Explanation
Answer:(c)
Q.22
The vitamin Niacin functions as a coenzyme in:
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a) Nuceloprotein synthesis
0%
b) Hydrogen transport
0%
c) Fatty acid synthesis
0%
d) RBC production
Explanation
Answer:(b)
Q.23
Cotton fibres mainly contains
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a) cellulose
0%
b) glycogen
0%
c) protein
0%
d) lipid
Explanation
Answer:(a)
Q.24
Cut surfaces of fruit and vegetables often become dark because
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a) dirty knife makes it dark
0%
b) oxidation of tannic acid in the presence of trace of iron from the knife makes it dark
0%
c) dust of the air makes it dark
0%
d) none of the above
Explanation
Answer:(b)
Q.25
The sweetest of all naturally occurring sugar is
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a) Mannose
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b) Galactose
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c) Fructose
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d) Glucose
Explanation
Answer:(c)
Q.26
The simplest amino acid -
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a) Tyrosine
0%
b) Alanine
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c) Asparagine
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d) Glycine
Explanation
The simplest, and smallest, amino acid found in proteins is glycine for which the R-group is a hydrogen (H). Basic Structure of an Amino Acid Answer:(c)
Q.27
In enzyme pepsin
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a) Two third of amino acids are working actively as enzyme
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b) The whole surface of enzyme is active
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c) Only one amino acid tyrosine of this enzyme is active and rest amino acids are inactive
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d) Three fourth of the amino acids are working actively as enzyme
Explanation
Answer:(c)
Q.28
Erwin Chargaff formula is:
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(a)
Q.29
Which of the following statement is incorrect?
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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.
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b) Keratin is a fibrous protein showing β – helical secondary structure.
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c) Essential amino acids include Linoleic acid, Linolenic acid and Arachidonic acid.
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d) Homopolysaccharide includes chitin, starch, glycogen, etc.
Explanation
The molar ratio of nitrogenous bases in DNA is govrn by Chargaff’s rules a) Base composition of DNA varies from one species to the other b) The amount of purine = Amount of pyrimidine A+G = C+T c) Amount of adenine = Amount of pyrimidine Amount of guanine = Amount of cytosine d) The base ratio of A+T:G+C may vary in DNA of different groups of animals but constant for a species Answer:(a)
Q.30
Which of the following have carbohydrate as prosthetic group?
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a) Glycoprotein.
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b) Chromoprotein.
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c) Lipoprotein
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d) nucleoprotein.
Explanation
Answer:(a)
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
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a) proteins
0%
b) minerals
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c) carbohydrates
0%
d) fats
Explanation
Answer:(d)
Q.32
The largest amount of cellulose (90%) amongst the natural material is present in
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a) Roughage
0%
b) Wood
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c) Cotton fibres
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d) Rayon
Explanation
Answer:(c)
Q.33
Hair keratin has
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a) β - pleated structure of protein
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b) α helical structure of protein
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c) Secondary structure of protein
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d) Primary structure of protein
Explanation
Answer:(b)
Q.34
Tetroses are not very common, they are found rare in nature and in few
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a) viruses
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b) bacteria
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c) plants
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d) animals
Explanation
Answer:(b)
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.
0%
a) 3
0%
b) 4
0%
c) 5
0%
d) 1
Explanation
Answer:(a)
Q.36
Choose the incorrect statement:
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a) Cholesterol is the most abundant steroid in the animal tissue.
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b) Arachidonic acid has 20 carbon atoms including the carbonyl carbon.
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c) Glycerides are esters of fatty acids with glycerol.
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d) Prostaglandins are derived from steroids.
Explanation
Answer:(d)
Q.37
In which one of the following sets of three items each belong to the category mentioned against them?
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a) Lysine, glycine, thiamine – amino acids
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b) Myosin, oxytocin and gastrin – hormones
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c) Rennin, helicase and hyaluronidase – enzymes
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d) Optic nerve, oculomotor, vagus – sensory nerves
Explanation
Answer:(c)
Q.38
Identify the given structure
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a) Adenylic acid
0%
b) Uracil
0%
c) Cholesterol
0%
d) Adenosine
Explanation
Answer:(b)
Q.39
Which of the following is a carbohydrate?
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a) Aleurone
0%
b) Inulin
0%
c) Cystolith
0%
d) Raphide
Explanation
Answer:(b)
Q.40
Enzymes have:
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a) Different pH and different temperature optima
0%
b) Different pH but same temperature optima
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c) Same pH but different temperature optima
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d) Same pH and temperature optima
Explanation
Answer:(b)
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.
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a) Only (i).
0%
b) Only (ii).
0%
c) (i) and (iii) only.
0%
d) (i), (ii) and (iii).
Explanation
Answer:(d)
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
0%
a) a = 1; b = 2; c = 3; d = 4
0%
b) a = 1; b = 4; c = 2; d = 3
0%
c) a = 1; b = 3; c = 2; d = 4
0%
d) a = 2; b = 3; c = 1; d = 4
Explanation
Answer:(c)
Q.43
Derivatives of phosphatidic acid, which are composed of glycerol, fatty acids and phosphoric acids are known as
0%
a) phospholipids
0%
b) acylghycerols
0%
c) triglycerides
0%
d) esters
Explanation
Answer:(a)
Q.44
Fatty acids which remain in liquid state at room temperature are said to be
0%
a) wax
0%
b) oil
0%
c) fats, glucose, starch
0%
d) lipids
Explanation
Answer:(b)
Q.45
Which of the following contain β-1,4 linkage?
0%
a) Maltose
0%
b) Sucrose
0%
c) Lactose
0%
d) Fructose
Explanation
Answer:(c)
Q.46
Identify the incorrect statement regarding the structure of proteins
0%
a) They are heteropolymers containing strings of amino acids
0%
b) The first amino acid in the primary structure is the N-terminus amino acid
0%
c) Only left helices are observed in proteins
0%
d) Tertiary structure is absolutely essential for many biological functions of the proteins
Explanation
Answer:(c)
Q.47
Which of the following is an essential amino acid?
0%
a) Cystine
0%
b) Glycine
0%
c) Phenylalanine
0%
d) Serine
Explanation
Answer:(c)
Q.48
Jute fibres deteriorate quickly because
0%
a) cellulose content is high
0%
b) lignin content is high
0%
c) cellulose content is low
0%
d) lignin content is low
Explanation
Answer:(b)
Q.49
Why sucrose is used instead of glucose to preserve fruit product?
0%
a) Sucrose is more common in nature
0%
b) Sucrose is easily available and has both glucose and fructose
0%
c) Glucose is reactive as it has CHO group
0%
d) None of these
Explanation
Answer:(c)
Q.50
A bond which is formed between Aldehyde or ketone group of monosaccharide and alcoholic group of another organic compound is known
0%
a) Ester bond
0%
b) Phosphodiester bond
0%
c) Peptide bond
0%
d) Glycosidic bond
Explanation
Answer:(d)
0 h : 0 m : 1 s
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