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Quiz 11
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Q.1
Enzyme involved in hydrolysis of starch to maltose is ... ...[ MPPMT 1999]
0%
a) Protease
0%
b) Amylase
0%
c) Lactase
0%
d) Maltase
Explanation
Maltose is produced by the enzymatic hydrolysis of starch (a homopolysaccharide) catalyzed by the enzyme amylase. Maltose is further hydrolyzed by the enzyme maltase to produce two molecules of d-glucose. Answer : (b)
Q.2
Which one is not a fibrillar protein .... ... [ kerala 2003]
0%
a) Keratin
0%
b) Collagen
0%
c) Albumin
0%
d) Elastin
Explanation
fibrillar proteins. Define what is a fibrillar protein. A typically insoluble protein that makes up the principal structural proteins of the body e.g., collagens, elastins, keratins, actin, and myosin Albumin is a family of globular proteins Answer : (c)
Q.3
Many enzymes are secreted in inactive form to protect ... ... [ Har PMT 1994]
0%
a) Cell proteins
0%
b) Mitochondria
0%
c) Cell membrane
0%
d) Cell DNA
Explanation
The reason for cells to secrete inactive enzymes is to prevent unwanted destruction of cellular proteins Answer : (a)
Q.4
Three of the following statement about enzymes are correct and one is wrong. Which one is wrong ... ....[ CBSE 2010]
0%
a) Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at 80°-90°C
0%
b) Enzymes require optimum pH for maximal activity
0%
c) Most enzymes are proteins but some are lipids
0%
d) Enzymes are highly specific
Explanation
Lipids are not enzymes. Lipids are group of macromolecules (large molecules) found in the body, consisting wide group of substances like fat and oils, certain vitamins (A,D,E,K), etc. Thus option 'c' is not a correct statement Answer : (c)
Q.5
Silk obtained from silkworm is a ... ... [ Odisha 2007]
0%
a) Fat
0%
b) Cellulose
0%
c) Protein
0%
d) Carbohydrate
Explanation
Silk consists mainly of two proteins, fibroin and sericin. Answer : (c)
Q.6
Which of the amino acids has hydroxyl in its R-group ... .... [ DPMT 2010]
0%
a) Serine
0%
b) Alanine
0%
c) Arginine
0%
d) Proline
Explanation
Serine one of the methylenic hydrogens is replaced by a hydroxyl group. Serine is one of two hydroxyl amino acids. Answer : (a)
Q.7
Boron helps plants in ... .... [ CBSE 2003]
0%
a) Sugar transport
0%
b) Activation of enzymes
0%
c) Functioning as enzyme cofactor
0%
d) Photosynthesis
Explanation
Boron helps control the transport of sugars in plants. Boron plays a key role in a diverse range of plant functions including cell wall formation and stability, maintenance of structural and functional integrity of biological membranes, movement of sugar or energy into growing parts of plants. Answer : (b)
Q.8
Amino acids not synthesised in our body are ... ... [ CPMT 1996]
0%
a) Non-essential
0%
b) Essential
0%
c) Non-proteinaceous
0%
d) Deaminated
Explanation
Essential amino acids cannot be made by the body. As a result, they must come from food. The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Answer : (b)
Q.9
End product of action of enzyme cellulase over cellulose is ... ... [ Wardha 2005]
0%
a) Glucose
0%
b) Sucrose
0%
c) Starch
0%
d) Glycogen
Explanation
Cellulases break down the cellulose molecule into monosaccharides such as beta-glucose, or shorter polysaccharides and oligosaccharides Answer : (a)
Q.10
Immunoglobulins are proteins that show ... .... [ AMU 2010]
0%
a) Primary
0%
b) Secondary
0%
c) Tertiary
0%
d) Quaternary
Explanation
Immunoglobulins are proteins are Quaternary Quaternary Structure have : 2 Light Chains: VL domain (110 residues), Constant Domain, CL (110 residues). 2 Heavy Chains: IgG VH domain has CH1, CH2, CH3. Answer : (d)
Q.11
Match the column ... ... [ kerala 2012]
1.Carbohydrates
a.Trypsin
2.Protein
b.Cholesterol
3.Nucleic acid
c.Inulin
4.Lipid
d.Adenylic acid
0%
a) 1 - c, 2 - a, 3 - d, 4 - b
0%
b) 1 - b, 2 -c, 3 - d, 4 - a
0%
c) 1 - c, 2 - d, 3 - a, 4 - b
0%
d) 1 - d , 2 - a, 3 - b, 4 - c
Explanation
Inulin belongs to the fructan group of polysaccharides and serves as a carbohydrate storage in many plant species.1 = c trypsin catalyzes the hydrolysis of peptide bonds, breaking down proteins into smaller peptides. 2= a adenylic acid A nucleotide found in RNA(ribonucleic acid). It is an ester of phosphoric acid with the nucleoside adenosine. It consists of a phosphate group, a pentose sugar ribose, and the nucleobase adenine. 3 = d Cholesterol is one of several types of fats (lipids) 4=a Answer : (a)
Q.12
Quaternary structure is present in ... .... [ HPPMT 2010]
0%
a) Histone
0%
b) Haemoglobin
0%
c) Globulin
0%
d) Potassium
Explanation
Quaternary structure is present in Haemoglobin Answer : (b)
Q.13
Sugar present in DNA is ... ...[ kerala 2002]
0%
a) Heptose
0%
b) Hexose
0%
c) Tetrose
0%
d) Pentose
Explanation
The pentose sugar in DNA is called deoxyribose, and in RNA, the sugar is ribose. Answer : (d)
Q.14
Major function of mineral Magnesium is ... .. [ CET Chd 2011]
0%
a) Formation of bones
0%
b) Maintenance of acid-base balance
0%
c) Storing of energy
0%
d) Activator of enzymes
Explanation
Magnesium is needed for more than 300 biochemical reactions in the body. It helps to maintain normal nerve and muscle function, supports a healthy immune system, keeps the heartbeat steady, and helps bones remain strong. It also helps adjust blood glucose levels. Answer : (a)
Q.15
Papain is obtained from ... ... [ Odisha 2009]
0%
a) Ficus carica
0%
b) Carica papaya
0%
c) Glycine max
0%
d) Citrus reticulata
Explanation
Papain, enzyme present in the leaves, latex, roots, and fruit of the Carica papaya (papaya plant) that catalyzes the breakdown of proteins by hydrolysis Answer : (b)
Q.16
Apoenzyme is .... ... [ RPMT 2011]
0%
a) Protein
0%
b) Amnino acid
0%
c) Vitamin
0%
d) AGU
Explanation
Apoenzyme is a protein that forms an active enzyme system by combination with a coenzyme and determines the specificity of this system for a substrate Answer : (a)
Q.17
A metal ion required for normal functioning of an enzyme is ... .... [ DPMT 2008]
0%
a) Holoenzyme
0%
b) Coenzyme
0%
c) Cofactor
0%
d) Prosthetic group
Explanation
A cofactor is a non-protein chemical compound or metallic ion that is required for an enzyme's activity as a catalyst, a substance that increases the rate of a chemical reaction. Answer : (c)
Q.18
Which enzyme is concerned with transfer of electrons? .... ... [ MPPMT 1998]
0%
a) Desmolase
0%
b) Hydrolase
0%
c) Dehydrogenase
0%
d) Transaminase
Explanation
Dehydrogenase enzymes transfer electrons from the substrate to an electron carrier Electron carriers are coenzymes that are often referred to as "redox cofactors." Answer : (c)
Q.19
Nucleotide is composed of .... .... [ CET Chd. 2003]
0%
a) Sugar
0%
b) Phosphoric acid
0%
c) Nitrogenous base
0%
d) All the above
Explanation
Answer : (d)
Q.20
Which of the following is a polysaccharide? .... ... [ W.B> 2007 ]
0%
a) Fructose
0%
b) Glucose
0%
c) Sucrose
0%
d) Cellulose
Explanation
Cellulose is a polysaccharide composed of a linear chain of β-1,4 linked d-glucose units with a degree of polymerization ranged from several hundreds to over ten thousands, which is the most abundant organic polymer on the earth. Answer : (d)
Q.21
match the columns ... ... [ kerala 2005]
Column I
Column II
a) Magnesium
p) Found in some amino acids
b) Sulphur
q) Not important for plants
c) Iodine
r) Structural component of chlorophyll
d) Manganese
s) Component of sugar
- - - -
t) Required for enzyme activity
0%
a) a - r, b - s, c - q, d - p
0%
b) a - r, b - p, c - q, d - s
0%
c) a - r, b - p, c - q, d - t
0%
d) a - s, b - r, c - p, d - t
Explanation
Chlorophyll a contains a magnesium ion encased in a large ring structure known as a chlorin. a - r, Methionine, cysteine, homocysteine, and taurine are the 4 common sulfur-containing amino acids,b - p, Iodine is not considered essential for land plants; however, in some aquatic plants, iodine plays a critical role in antioxidant metabolism. c - q, Manganese activates specific enzymes such as pyruvate carboxylase, lipase, superoxide dismutase, d - t Answer : (c)
Q.22
Reducing sugar is ... ..... [ AFMC 2012]
0%
a) Glycogen
0%
b) Sucrose
0%
c) Lactose
0%
d) All the above
Explanation
All monosaccharides are reducing sugars because they either have an aldehyde group (if they are aldoses) or can tautomerize in solution to form an aldehyde group (if they are ketoses). This includes common monosaccharides like galactose, glucose, glyceraldehyde, fructose, ribose, and xylose. Answer : (c)
Q.23
Nickel is component of ... .... [ BHU 1998]
0%
a) PEP carboxylase
0%
b) Rubisco
0%
c) Urease
0%
d) Nitrate reductase
Explanation
Answer : (c)
Q.24
Which one is not added in detergents .... ... [ DPMT 2007]
0%
a) Amylase
0%
b) Protease
0%
c) Peptidase
0%
d) Cellulase
Explanation
α-Amylase is particularly useful in dish-washing and de-starching detergents. Protease break down various stains during fabric washing. After the washing cloths with cellulase, white clothes will be whiter and color clothes will be brighter and softer. Answer : (c)
Q.25
Excess ATP inhibits respiration by inhibiting one of the following enzymes .... .... [ JIPMER 1999 ]
0%
a) Phosphofructokinase
0%
b) Hexokinase
0%
c) Pyruvic decarboxylase
0%
d) Aldolase
Explanation
Phosphofructokinase-1 (PFK-1) is one of the most important regulatory enzymes PFK-1 catalyzes the important "committed" step of glycolysis, the conversion of fructose 6-phosphate and ATP to fructose 1,6-bisphosphate and ADP. Glycolysis is the foundation for respiration, both anaerobic and aerobic. High ratio of ATP to ADP inhibit PFK and glycolysis. Answer : (a)
Q.26
Which one is cofactor of carbonic anhydrase ... ... [ WB 2010]
0%
a) Fe
0%
b) Zn
0%
c) Cu
0%
d) Mg
Explanation
The Zn acts as a cofactor in carbonic anhydrase and plays an important role in carboxylation. The presence of Zn ion (Zn2+) on active site which binds with the enzyme and causes reduction in pKa value and finally, allows the nucleophilic attack on CO2. Answer : (b)
Q.27
Starch is .... ..... [ RPMT 2002]
0%
a) (C6H5O6)n
0%
b) (C6H10O5)n
0%
c) (C12H22O11)n
0%
d) (C12H24O11)n
Explanation
The basic chemical formula of the starch molecule is (C6H10O5)n Answer : (b)
Q.28
Cellulose occurs in ... ... [ Har PMT 1994]
0%
a) Tunicates
0%
b) Cell membrane
0%
c) Cell wall
0%
d) Both a and c
Explanation
Tunicates tissue (also known as tunic tissue) is composed of cellulose microfibrils Tunicates are unusual among animals in that they produce a large fraction of their tunic and some other structures in the form of cellulose. The production in animals of cellulose the tunicates found to possess a functional cellulose synthesizing enzyme, encoded by a gene horizontally transferred from a bacterium. Answer : (d)
Q.29
hich one is absent in honey? ... .... [ W.B. 2007]
0%
a) Glucose
0%
b) Lactose
0%
c) Maltose
0%
d) Levulose
Explanation
honey is lactose-free Answer : (b)
Q.30
Which one is not a disaccharide? ... .... [ W.B. 2008]
0%
a) Maltose
0%
b) Sucrose
0%
c) Lactose
0%
d) Galactose
Explanation
Galactose is momosaccharide Answer : (d)
Q.31
Insulin ( bovine) has 51 amino acids in A and B polypeptides. the polypeptide A possesses amino acids ... ... [ BHU 1994]
0%
a) 31
0%
b) 21
0%
c) 20
0%
d) 30
Explanation
Chain A have 21 amino acids Chain B have 30 amino acds Answer : (b)
Q.32
Name the type of enzyme involved in the following reaction S-G + S' → S+S'-G ... ..... [ kerala 2011]
0%
a) Dehydrogenase
0%
b) Transferase
0%
c) Hydrolase
0%
d) Lyase
Explanation
In reaction S-G + S' → S + S'-G group is tranfered A transferase is any one of a class of enzymes that enact the transfer of specific functional groups Answer : (b)
Q.33
A non-reducing /table sugar is ... .... [ CPMT 2009]
0%
a) Glucose
0%
b) Sucrose
0%
c) Galactose
0%
d) Mannose
Explanation
Sucrose is a non-reducing sugar because the two monosaccharide units are held together by a glycosidic linkage between C1 of α-glucose and C2 of β-fructose. Answer : (c)
Q.34
Nucleotides are formed of ... ...[ MPPMT 2009]
0%
a) Purine, sugar nad phosphate
0%
b) Purine, pyrimidine and phosphate
0%
c) Pyrimidine, sugar and phosphate
0%
d) Purine, pyrimidine, sugar and phosphate
Explanation
Nucleotides are composed of three subunit molecules: a nitrogenous base (also known as nucleobase), a five-carbon sugar (ribose or deoxyribose), and a phosphate group consisting of one to three phosphates. Four different types of nitrogenous bases are found in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G). Answer : (d)
Q.35
A nucleoside differs from nucleotide in not having ... ... [ DPMT 2010]
0%
a) Sugar
0%
b) Nitrogen base
0%
c) Phosphate
0%
d) Phosphate and sugar
Explanation
Nucleotides are phosphoric acid esters of nucleosides. Answer : (c)
Q.36
An example of non-competitive inhibition is .... .... [ kerala 2009]
0%
a) Inhibition of succinic acid by malonate
0%
b) Cyanide action on cytochrome oxidase
0%
c) Sulpha drug on folic acid synthesizing bacteria
0%
d) Inhibition of hexokinase by glucose 6-phosphate
Explanation
Non-competitive inhibition is a type of enzyme inhibition where the inhibitor reduces the activity of the enzyme and binds equally well to the enzyme whether or not it has already bound the substrate The cyanide ion, CN-, binds to the iron atom in cytochrome C oxidase in the mitochondria of cells. It acts as an irreversible enzyme inhibitor, preventing cytochrome C oxidase Answer : (b)
Q.37
Prostaglandin is ... ... [ CPMT 2007]
0%
a) Steroid
0%
b) Carbohydrate
0%
c) Amino acid
0%
d) Fatty acid
Explanation
The prostaglandins are a group of lipids made at sites of tissue damage or infection that are involved in dealing with injury and illness. Answer : (d)
Q.38
Macromolecule chitin is ... .... [ HPPMT 2011]
0%
a) Sulphur containing polysaccharide
0%
b) Phosphorus containing polysaccharide
0%
c) Nitrogen containing polysaccharide
0%
d) Simple polysaccharide
Explanation
Chitin is a modified polysaccharide that contains nitrogen Answer : (c)
Q.39
Glycosidic linakge in maltose is .... ... [ kerala 2001]
0%
a) α4 → 1
0%
b) β4 → 1
0%
c) α1 → 4
0%
d) β1 → 4
Explanation
In maltose, two d-glucose residues are joined by a glycosidic linkage between the α-anomeric form of C-1 on one sugar and the hydroxyl oxygen atom on C-4 of the adjacent sugar. Such a linkage is called an α-1,4-glycosidic bond. Answer : (c)
Q.40
Inhibition of acetylcholine by DFP(diisopropyl fluorophosphate) is ... ..... [ AMU 2012]
0%
a) Competitive inhibition
0%
b) Non-competitive inhibition
0%
c) Non-competitive irreversible inhibition
0%
d) Allosteric inhibition
Explanation
Non competitive inhibitors are usually reversible, but are not influenced by concentrations of the substrate as is the case for a reversible competive inhibitor. Irreversible Inhibitors form strong covalent bonds with an enzyme. Diisopropyl fluorophosphate is a dialkyl phosphate. An irreversible cholinesterase inhibitor with actions similar to those of echothiophate Answer : (c)
Q.41
No cell can live without ... .... [ MPPMT 1997]
0%
a) Chloroplasts
0%
b) Proteins
0%
c) Enzymes
0%
d) Phytochrome
Explanation
Life could not exist without enzymes. Essentially, enzymes are biological catalysts that speed upbiochemical reactions Answer : (c)
Q.42
Select the incorrect statement ... .... [ kerala 2011]
0%
a) Amino acid are substituted methane
0%
b) Glycerol is trihydroxy propane
0%
c) Lecithin is phospholipid
0%
d) Lysin is neutral amino acid
Explanation
Lysine is Basic amino acid, statement 'd' is not correct Answer : (d)
Q.43
Which one is phosphoprotein? ... .... [ kerala 2000 ]
0%
a) Ferritin
0%
b) Casein
0%
c) Mucin
0%
d) Albumin
Explanation
Phosphoprotein is any of a group of proteins, such as casein, containing chemically bound phosphoric acid. Any of a group of proteins containing a phosphorous compound, as casein in milk. Any of a group of proteins, such as casein, containing chemically bound phosphoric acid. Answer : (b)
Q.44
Heparin is synthesised in .... ..... [ BHU 2005]
0%
a) Kidney
0%
b) Salivary glands
0%
c) Pancreas
0%
d) Liver
Explanation
heparin. a naturally occurring mucopolysaccharide that acts in the body as an antithrombin factor to prevent intravascular clotting. The substance is produced by basophils and mast cells, which are found in large numbers in the connective tissue surrounding capillaries, particularly in the lungs and liver. Answer : (a)
Q.45
Content of nucleic acids in protoplasm is .... .... [ RPMT 1995]
0%
a) 35%
0%
b) 29%
0%
c) 10%
0%
d) 4%
Explanation
Substance
Percent Dry Weight
Protein
28
Nucleic acids
4
Other nitrogen-containing compounds
12
Fat
18
Cholesterin
1
Lecithin
5
Carbohydrates
23
other
9
Answer : (d)
Q.46
Enzymes catalysing removal of groups and formation of double bond are ... ... [ CET Chd. 2009]
0%
a) Transferases
0%
b) Ligases
0%
c) Lyase
0%
d) Oxidoreductases
Explanation
Enzymes removing groups from substrates non-hydrolytically, leaving double bonds (or adding groups to double bonds) should be called lyases in the systematic nomenclature. Lyase-catalyzed reactions break the bond between a carbon atom and another atom such as oxygen, sulfur, or another carbon atom. Answer : (c)
Q.47
DNA resembles RNA as both have ... ..... [ CBSE 2000 ]
0%
a) Polymers of nucleotides
0%
b) Similar sugars
0%
c) Similar pyrimidine bases
0%
d) Ability to replicate
Explanation
Both DNA and RNA, consist of polymers of nucleotides. The nucleotides are linked covalently between the 3' carbon atom of the pentose and the phosphate group attached to the 5' carbon of the adjacent pentose Answer : (a)
Q.48
A coenzyme is .... .... [ AFMC 1994]
0%
a) Organic non-proteinaceous group that is essential for enzyme activity
0%
b) Organic or inorganic group that is essential for enzyme activity
0%
c) Same enzyme found in different organs or tissues
0%
d) One that shares function of another enzyme
Explanation
A coenzyme is organic non-proteinaceous group that is essential for enzyme activity Answer : (a)
Q.49
Non-protein organic component of enzyme is ... ... [ AFMC 2008]
0%
a) Apoenzyme
0%
b) Holoenzyme
0%
c) Coenzyme
0%
d) Isozyme
Explanation
Answer : (c)
Q.50
Major and minor grooves occur in ... ... [ MHTCET 2010]
0%
a) Polypeptide
0%
b) RNA
0%
c) DNA
0%
d) Chromatin
Explanation
Answer : (c)
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