Q.1
What is Guanine?
  • a) Purine
  • b) Hormone
  • c) Enzyme
  • d) Pyrimidine
Q.2
Protoplasm is formed of .... .... [ RPMT 1998]
  • a) O, P, minerals
  • b) H, C, Iron
  • c) O, N, Iron
  • d) O, C, H, N
Q.3
Phosphorus is present in .... .... [ JKCMEE 2005]
  • a) Protein
  • b) DNA
  • c) RNA
  • d) Both b and c
Q.4
In DNA, adenine pairs with ... ... [ MPPMT 1992]
  • a) Guanine
  • b) Thymine
  • c) Cytosine
  • d) Uracil
Q.5
"Lock and Key" model of enzyme action illustrate that a particular enzyme molecule .... ...[ DPMT 2009]
  • a) Is destroyed and resynthesized several times
  • b) reacts at the same rate in all conditions
  • c) Interacts with specific type of substrate molecule
  • d) Forms a permanent enzyme -substrate complex
Q.6
Enzymes joining two molecules by establishing covalent bonds are .... .... [ kerala 2002]
  • a) Ligase
  • b) Transferases
  • c) Oxidoreductases
  • d) Lyases
Q.7
Km value of enzyme is substrate concentration at ... ... [ BHU 2001]
  • a) 1/4 Vmax
  • b) 2Vmax
  • c) 1/2 Vmax
  • d) 4Vmax
Q.8
Fehling's solution can detect ... .... [ CBSE 2001]
  • a) Glucose
  • b) Sucrose
  • c) Starch
  • d) Fat
Q.9
Optimum temperature is the temperature at which an enzyme ... ..
  • a) Works at its best
  • b) Is not destroyed
  • c) Action is reversed
  • d) Is inactivated
Q.10
Decreasing order concentration of minerals inside cell is .... .. [ Har PMT 1994]
  • a) Ca-K-Na
  • b) K-Ca-Na
  • c) K-Na-Ca
  • d) Na-K-Ca
Q.11
Essential-non-essential amino acid is ... ...[ AMU 2010]
  • a) Lysine - Leucine
  • b) Valine - tyrosine
  • c) Methionine - Threonine
  • d) Alanine - Cystine
Q.12
Cellulose is made of ... ... [ AIIMS 2007]
  • a) Unbranched chain of glucose molecules linked by α-1, 6 glycosidic bonds
  • b) unbranched chain of glucose molecules inked by β-1, 4 glycosidic bonds
  • c) Branched chain of glucose molecules having α1, 6 glycosidic bonds at the site of branching
  • d) Branched chain of glucose molecules with α-1, 6 glycosidic bonds in the straight chain and β-1, 4 linked bonds at the site of branching
Q.13
An essential amino acid is ... ... [ AMU 2003 ]
  • a) Tryptophan
  • b) Glycine
  • c) Lutamine
  • d) Tyrosine
Q.14
Chemical nature of cellulose is .... .... [ KCET 2004]
  • a) Disaccharide
  • b) Polypeptide
  • c) Polysaccharide
  • d) Polynucleotide
Q.15
Quaternary structure of protein ... .... [ WB 2008]
  • a) Consists of 4 subunits
  • b) Is either α or β
  • c) Is unrelated to its functions
  • d) Is dictated by primary structure of individual subunits
Q.16
Moisturizing gel is extracted from ... ... [ Odisha 2004]
  • a) Saraca indica
  • b) Aloe vera
  • c) Acacia vestita
  • d) None of the above
Q.17
One of the following is not a carbohydrate .... .... [ RPMT 1995 ]
  • a) Maltose
  • b) Pepsin
  • c) Cellulose
  • d) Ascorbic acid
Q.18
Which one is polymerized to yield proteins? ... .... [ DPMT 1999 ]
  • a) Amino acids
  • b) Muramic acid
  • c) Monosaccharaides
  • d) All the above
Q.19
A typical homopolysaccharide is ... .... [ WB 2011]
  • a) Starch
  • b) Lignin
  • c) Insulin
  • d) Suberin
Q.20
The activity of succinate dehydrogenase is inhibited by ... .... [ AMU 1992]
  • a) Malonate
  • b) Pyruvate
  • c) Glycolate
  • d) Phosphoglycerate
Q.21
Assertion: Enzymes lower the activation energy of the reactant molecule to make the transition into product easier Reason: Enzymes are highly substrate specific ... ... [ AIIMS 2011]
  • a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
  • c) Assertion is true but, Reason is false
  • d) Assertion is false but, Reason is true
Q.22
Nomenclature of enzyme consists of ... ... [ Pb PMT 2000 ]
  • a) First substrate name and then reaction name
  • b) First reaction name and then product name
  • c) Only product name
  • d) Only reaction name
Q.23
Km value is dependent upon ... ..[ Har PMT 2003]
  • a) Temperature
  • b) Substrate concentration
  • c) Enzyme concentration
  • d) All the above
Q.24
Select the specific base pairs of DNA:
  • a) Adenine and Cytosine
  • b) Guanine and Adenine
  • c) Adenine and Thymine
  • d) Guanine and Uracil
Q.25
Which one promotes softening of fruits? ... .. [ kerala 2008]
  • a) Polygalacturonase
  • b) Polyethylene glycol
  • c) Colchicine
  • d) Cellulase
Q.26
Which group has the same distance class ... ... [ HPPMT 2001]
  • a) Sterols, Waxes, Amino acids, Starch
  • b) Lipids, RNA, Glycine, Cellulose
  • c) DNA, RNA, Nucleosides, Nucleotides
  • d) Ribose, Sucrose, Glucose, Maltose
Q.27
A unit composed of sugar and nitrogen base linked by glycosidic bond is ... ...[ AIIMS 1997]
  • a) Purine
  • b) Glycoside
  • c) Nucleoside
  • d) Nucleotide
Q.28
Tertiary structure of proteins having amino acid cysteine is achieved through ... ... [ kerala 2003]
  • a) Ionic bonds
  • b) Covalent bonds
  • c) Disulphide bonds
  • d) Hydrogen bonds
Q.29
Ribose is ... ... [ [ MPPMT 2011]
  • a) Monosaccharide
  • b) Disaccharide
  • c) Polysaccharide
  • d) Heteropolymer
Q.30
RNA contains ... ..... [ JIPMER 1998]
  • a) Hexose sugar
  • b) Dextrose sugar
  • c) Ribose sugar
  • d) Deoxyribose sugar
Q.31
Membrane permeability is controlled by ... ... [ CPMT 1992]
  • a) Na+
  • b) K+
  • c) Both a and b
  • d) Ca2+
Q.32
Enzymes, vitamins and hormones are common in ... ... [ BHU 1997]
  • a) Being proteinaceous
  • b) Being synthesised in the body of organisms
  • c) Enhancing oxidative metabolism
  • d) Regulating metabolism
Q.33
Lipids are insoluble in water as they are .... ... [ CBSE 2002]
  • a) Hydrophilic
  • b) Hydrophobic
  • c) Zwitterions
  • d) Neutral
Q.34
Which one is the hydrogen acceptor? .... .... [ AFMC 1991]
  • a) CoA
  • b) NADP+
  • c) ATP
  • d) DNA
Q.35
Major role of minor elements inside living organisms is to act as .... ..... [ CBSE 2003]
  • a) Cofactor of enzymes
  • b) Binder of cell structure
  • c) Constituent of hormones
  • d) Building blocks of amino acids
Q.36
A substance unrelated to substrate but capable of reversibly changing active site is called .... .. [ JKCMEE 2003]
  • a) Competitive inhibitor
  • b) Non-competitive inhibitor
  • c) Catalytic inhibitor
  • d) Allosteric modulator/inhibitor
Q.37
Enzyme hexokinase is inhibited by excess glucose 6-P. It is .... ... [ Har.PMT 1996]
  • a) Competitive inhibition
  • b) Feed-back allosteric inhibition
  • c) Non-competitive inhibition
  • d) Positive feed-back
Q.38
Ribose sugar is not a component of ... ... [ MHT CET 2009]
  • a) AMP
  • b) ATP
  • c) DNA
  • d) RNA
Q.39
Which is structural polysaccharide .... ...
  • a) Glycogen
  • b) Chitin
  • c) Keratin
  • d) Pectin
Q.40
A nucleoside is formed of ... .... [ BHU 2000]
  • a) Pentose sugar, phosphate and nitrogen base
  • b) Phosphate and nitrogen base
  • c) Pentose sugar and phosphate
  • d) Pentose sugar and nitrogen base
Q.41
Molecules having charged group of opposite polarity are .... ... [ DPMT 2010]
  • a) Zwitterions
  • b) Anions
  • c) Cations
  • d) Negative ions
Q.42
Sulphur containing amino acid is ... ... [ WB 2008]
  • a) Methionine
  • b) Cystine
  • c) Cysteine
  • d) All the above
Q.43
Sucrose is ... ..... [ Odisha 2007]
  • a) Monosaccharaide
  • b) Disaccharide
  • c) Trisaccharide
  • d) Polysaccharide
Q.44
Iodine test can detect ... .. [ KCET 1993]
  • a) Carbohydrates
  • b) Nucleic acids
  • c) Lipids
  • d) Proteins
Q.45
In the genera formula of amino acid stated below. Here R stands for ... ...
unit-3_ch-4_que_no-338_img_no1.png
  • a) An amino acid
  • b) A carboxylic group
  • c) A variable group
  • d) A hydroxyl group
Q.46
An important step in the manufacture of pulp in paper industry from woody tissues of plants is ... .... [ CBSE 2005]
  • a) Preparation of pure cellulose by removing lignin
  • b) Treatment of wood with chemicals for breakdown of cellulose
  • c) Removal of oil by suitable chemicals
  • d) Removal of water from wood by prolonged heat at 50°C
Q.47
An enzyme brings about ... .... [ CBSE 1993]
  • a) Decrease in reaction time
  • b) Increase in reaction time
  • c) Increase in activation energy
  • d) Reduction in activation energy
Q.48
Lipids provide insulation against cold and hot weather to exoskeleton of insects in form of
  • a) cutin
  • b) waxes
  • c) cholesterol
  • d) oil
Q.49
Joining of repeating units to fom a macromolecule is called ... ... [ Pb PMT 1997]
  • a) Polymerization
  • b) Aggregation
  • c) Polymorphism
  • d) Condensation
Q.50
Single letter symbol F is used for the amino acid ... ... [ BHU 1993]
  • a) Phenylalanine (Phe)
  • b) Proline (Pro)
  • c) Tryptophan (Try)
  • d) Methionine (Met)
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