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Quiz 2
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Q.1
Triglyceride consists of ... ... [ kerala 2003]
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a) Three fatty acids + two glycerol
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b) Three fatty acids + one glycerol
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c) One fatty acid + one glycerol
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d) One fatty acid + three glycerol
Explanation
Answer : (b)
Q.2
Adenine is ... ..... [ CBSE 1992]
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a) Purine
0%
b) Pyrimidine
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c) Nucleoside
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d) Nucleotide
Explanation
Adenine and Guanine are purines Answer : (a)
Q.3
Study the statements and choose the correct answer Statement a: Amino acids are amphoteric Statement b: All amino acids are necessary for our body ... .... [ KCET 2008]
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a) a and b are correct
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b) a and b are wrong
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c) a is correct, b is wrong
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d) a is wrong, b is correct
Explanation
Amino acids are amphoteric, which means they have acidic and basic tendencies. The carboxyl group is able to lose a proton and the amine group is able to accept a proton. Statement 'a' is correct Body needs 20 different amino acids to grow and function properly. There are nine essential amino acids, which you must get through your diet: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. Statement 'b' wrong Answer : (c)
Q.4
Which one is a disaccharide? ... ... [ RPMT 2002]
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a) Sucrose
0%
b) Glucose
0%
c) Fructose
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d) Galactose
Explanation
Monosaccharides are glucose, galactose, ribose, and glyceraldehyde. Disaccharides are Sucrose, Lactose, Maltose Trisaccharide are Nigerotriose, Maltotriose, Melezitose, Maltotriulose, Raffinose, Kestose Polysaccharides are Starch,Cellulose, Glycogen Answer : (a)
Q.5
Which one contains four pyrimidine bases? ... ..[ CBSE 1994]
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a) GATCAATGC
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b) GCUAGACAA
0%
c) UAGCGGUAA
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d) TGCCTAACG
Explanation
Adenine and guanine are purines while thymine and cytosine are pyrimidines. A, four pyrimidine bases are present (thymine- 2, cytosine - 2). Answer : (a)
Q.6
Phospholipids are ... .... [ DPMT 1999 ]
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a) Amphibolic
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b) Amphipathic
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c) Hydrophobic
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d) Hydrophilic
Explanation
Amphipathic (or amphiphilic)—that is, they have a hydrophilic or polar end and a hydrophobic or nonpolar end. Amphipathic (of a molecule, especially a protein) having both hydrophilic and hydrophobic parts. Answer : (b)
Q.7
With reference to enzyme, turn over number means substrate molecules converted into products per ... ... [ KCET 2010]
0%
a) Hour
0%
b) Second
0%
c) Minute
0%
d) Day
Explanation
In enzymology, turnover number (also termed kcat) is defined as the maximum number of chemical conversions of substrate molecules per second that a single catalytic site will execute for a given enzyme Answer : (b)
Q.8
DNA does not occur in ... .... [ BHU 1991]
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a) Nucleus
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b) Ribosomes
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c) Mitochondria
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d) Plastid
Explanation
A ribosome is made out of RNA and proteins, and each ribosome consists of two separate RNA-protein complexes Answer : (b)
Q.9
Which is a homopolysaccharide .... .... [ AIIMS 2012]
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a) Pectin
0%
b) Heparin
0%
c) Hyaluronic acid
0%
d) Inulin
Explanation
Inulin is Homopolysaccharide with 3–60 fructose units per chain Answer : (d)
Q.10
Which one value is required for enzyme action? ... .. [ BHU 2000 ]
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a) Low Km
0%
b) High Km
0%
c) Low Ki
0%
d) High Ki
Explanation
The smaller the Ki(Inhibitory Constant ) the greater the binding affinity and the smaller amount of medication needed in order to inhibit the activity of that enzyme. If a Ki is much larger than the maximal drug concentrations that a patient is typically exposed to from typical dosing, then that drug is not likely to inhibit the activity of that enzyme. The Michaelis constant, Km, is defined as the substrate concentration at which the reaction rate is half of the maximum, Vmax. is not a direct measure of an enzyme’s affinity for a substrate Answer : (c)
Q.11
98% of living organism is formed of six elements - carbon, hydrogen, nitrogen, oxygen and ... .. [ CBSE 2007]
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a) S and Mg
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b) Mg and BA
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c) Ca and P
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d) P and S
Explanation
Answer : (d)
Q.12
ELISA test is used to .... .... [ AIIMS 1993]
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a) Separate viral RNA
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b) Purify proteins
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c) Isolate DNA sequence
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d) Identify specific proteins
Explanation
ELISA stands for enzyme-linked immunoassay. It is a commonly used laboratory test to detect antibodies in the blood. An antibody is a protein produced by the body's immune system when it detects harmful substances, called antigens. Answer : (d)
Q.13
In a protein, amino acids are linked by ...... ..... [ MHT CET 2007]
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a) Peptide bonds
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b) Glycosidic bonds
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c) Hydrogen bonds
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d) All the above
Explanation
Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain. Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid. Answer : (a)
Q.14
Which amino acid is not optically active? ... .... [ BHU 2005]
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a) Glycine
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b) Leucine
0%
c) Histidine,
0%
d) Isoleucine
Explanation
Glycine is the simplest amino acid and is the only amino acid that is not optically active (it has no stereoisomers). Answer : (a)
Q.15
Biocatalysts were found accidently in Yeast extract by .... ... [ Har PMT 1996]
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a) Sumner
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b) Kuhne
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c) Buchner
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d) Pasteur
Explanation
The experiment for which Buchner won the Nobel Prize consisted of producing a cell-free extract of yeast cells and showing that this "press juice" could ferment sugar. Answer : (c)
Q.16
Ultraviolet light absorbed by nucleic acids is ... ..... [ RPMT 2000 ]
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a) 26 nm
0%
b) 75 nm
0%
c) 260 nm
0%
d) 1500 nm
Explanation
One of the most common methods for nucleic acid detection is the measurement of solution absorbance at 260 nm (A260) due to the fact that nucleic acids have an absorption maximum at this UV wavelength. Answer : (c)
Q.17
Induced fit theory of enzyme action was proposed by ... ...[ PbPMT 1999 ]
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a) Koshland
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b) Fischer
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c) Hershey and Chase
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d) Sumner
Explanation
The induced fit model suggested by Daniel Koshland in 1958. Answer : (a)
Q.18
Alpha helices and beta sheet are the examples of protein organization ... .... [ JKCET 2012]
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a) Primary structure
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b) Secondary structure
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c) Tertiary structure
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d) Quaternary structure
Explanation
Protein secondary structure is the three dimensional form of local segments of proteins. The two most common secondary structural elements are alpha helices and beta sheets, though beta turns and omega loops occur as wel Answer : (b)
Q.19
Which is a component of chlorophyll? ... ... [ JKCMEE 2004 ]
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a) Mg
0%
b) Mn
0%
c) Zn
0%
d) Fe
Explanation
Chlorophyll a contains a magnesium ion encased in a large ring structure known as a chlorin. The chlorin ring is a heterocyclic compound derived from pyrrole. Four nitrogen atoms from the chlorin surround and bind the magnesium atom. The magnesium center uniquely defines the structure as a chlorophyll molecule Answer : (a)
Q.20
A non-proteinaceous enzyme is ... .... [ Manipur 2007]
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a) Lysozyme
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b) Ribozyme
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c) Ribonuclease-P
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d) Both b and c
Explanation
Ribozymes are RNA molecules that can carry out enzymatic function by speeding up the rate of a chemical reactio Ribonuclease-P is a ribonucleic acid that acts as a catalyst in the same way that a protein-based enzyme would. Its function is to cleave off an extra, or precursor, sequence of RNA on tRNA molecules. Answer : (d)
Q.21
Arachidonic acid is ... ... [ BHU 1998]
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a) Non-essential fatty acid
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b) Saturated fatty acid
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c) Monounsaturated fatty acid
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d) Polyunsaturated fatty acid
Explanation
Arachidonic acid is a polyunsaturated, essential fatty acid that has a 20-carbon chain as a backbone and four cis-double bonds at the C5, C8, C11, and C14 positions Answer : (d)
Q.22
Which is wrong ... .... [ JKCMEE 2003]
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a) Uracil is pyrimidine
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b) Glycine contains sulphur
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c) Sucrose is disaccharide
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d) Cellulose is polysaccharide
Explanation
Glycine is an amino acid that has a single hydrogen atom as its side chain. , with the chemical formula NH2‐CH2‐COOH. Glycine is one of the proteinogenic amino acids. Answer : (b)
Q.23
Most of the water found in the young cell occurs in ... .... [ DPMT 2002]
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a) Cell wall
0%
b) Nucleus
0%
c) Cytoplasm
0%
d) Vacuoles
Explanation
The cytoplasm is about 80% water and usually colorless Answer : (c)
Q.24
An organic substance bound to an enzyme and essential for its activity is .... ... [ AFMC 2008]
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a) Isoenzymes
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b) Coenzyme
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c) Apoenzymes
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d) Holoenzyme
Explanation
Coenzyme is a non-protein compound that is necessary for the functioning of an enzyme. Answer : (b)
Q.25
The following molecule is ... ..[ W.B. 2007]
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a) Galactose
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b) Glucose
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c) Fructose
0%
d) Lactose
Explanation
Galactose is a monosaccharide and has the same chemical formula as glucose, i.e., C6H12O6. It is similar to glucose in its structure, differing only in the position of one hydroxyl group. Answer : (a)
Q.26
Maximum amount of cellulose occurs in .... .... [ RPMT 1995]
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a) Cotton
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b) Coir
0%
c) Hemp
0%
d) Flax
Explanation
The cellulose content of cotton fiber is 90%, Dried hemp is approximately 57%. Flax fibres are found varying in the range from 64.57 to 75.38 %, Coir contan 28% of cellulose Answer : (a)
Q.27
Watson and Crick were awarded Nobel Prize for their finding of ... .... [ MPPMT 1995]
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a) RNA is single stranded
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b) DNA is double stranded
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c) DNA is genetic material
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d) DNA guides mRNA synthesis
Explanation
The Nobel Prize in Physiology or Medicine 1962 was awarded jointly to Francis Harry Compton Crick, James Dewey Watson and Maurice Hugh Frederick Wilkins Watson and Crick realized that DNA was made up of two chains of nucleotide pairs that encode the genetic information for all living things. Answer : (b)
Q.28
Primary structure of polypeptide is stabilised or secondary structure of polypeptide is maintained by ... .... [ Manipur 2009]
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a) Hydrogen bonds
0%
b) Disulphide bonds
0%
c) Ionic bonds
0%
d) Hydrophobic interactions
Explanation
The α helix, β strand and sheet, and turn are the most prevalent elements of protein secondary structure, which is stabilized by hydrogen bonds between atoms of the peptide backbone. Answer : (a)
Q.29
Which of the following has coenzyme activity? .... .... [ AMU 1992]
0%
a) Nicotinamide
0%
b) Purine
0%
c) Pyrimidine
0%
d) Both b and c
Explanation
Answer : (a)
Q.30
Proteins can be denatured by ... ..... [ ODisha 2008]
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a) Carbon dioxide
0%
b) Carbon monoxide
0%
c) Heat
0%
d) Oxygen
Explanation
Heat denatured protein as it increases the kinetic energy and causes the molecules to vibrate so rapidly and violently that the bonds are disrupted. Proteins are denatured by treatment with alkaline or acid, oxidizing or reducing agents, and certain organic solvents. Answer : (c)
Q.31
Glycogen is a polymer of repeating unit of ... ... [ CBSE 1992]
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a) Galactose
0%
b) Glucose
0%
c) Fructose
0%
d) Sucrose
Explanation
Glycogen is a polymer of glucose. Answer : (b)
Q.32
Enzyme required for joining two molecules is .... ... [ BHU 2003]
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a) ligase
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b) Diastase
0%
c) Polymerase
0%
d) Hydrolase
Explanation
ligase: This enzyme catalyzes reaction between two molecules A and B that are combining to form complex between the two to give AB. It is important to note that ligase in energy dependent enzyme, i.e. it requires ATP. A polymerase is an enzyme (EC 2.7.7.6/7/19/48/49) that synthesizes long chains of polymers or nucleic acids. Answer : (a)
Q.33
Chemical used most by plants is .... .... [ DPMT 1992]
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a) Carbon dioxide
0%
b) Oxygen
0%
c) Cytochrome
0%
d) Nitrogen
Explanation
Plants get carbon dioxide from the atmosphere which is released by animals and burning of fuels. Answer : (a)
Q.34
Which is not a protein/non-protein enzyme ... ..[ AMU 2010]
0%
a) α-amylase
0%
b) Nitrogenase
0%
c) Histidine kinase
0%
d) Ribozyme
Explanation
A ribozyme is a ribonucleic acid (RNA) enzyme that catalyzes a chemical reaction. The ribozyme catalyses specific reactions in a similar way to that of protein enzymes. Answer : (d)
Q.35
Which is not correct? .. .... [ kerala 2000 ]
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a) Na+ ions help retain water
0%
b) Na+ ions help conduct nerve impulse
0%
c) Na+ ions help in transport of substances across membranes
0%
d) Na+ ions are important components of blood plasma
Explanation
Except certain proteins all the substances are transported across the membrane by the process of diffusion During active transport, ATP is required to move a substance across a membrane, often with the help of protein carriers, and usually against its concentration gradient Answer : (c)
Q.36
DNA is composed of repeating units of .... .... [ CBSE 1991]
0%
a) Ribonucleosides
0%
b) Deoxyribonucleosides
0%
c) Ribonucleotides
0%
d) Deoxyribonucleotides
Explanation
A deoxyribonucleotide is a nucleotide that contains deoxyribose. They are the monomeric units of the informational biopolymer, deoxyribonucleic acid (DNA). Answer : (d)
Q.37
A basic amino acid is ... .... [ DPMT 2011]
0%
a) Leucine
0%
b) Methionine
0%
c) Aspartic acid
0%
d) Lysine
Explanation
Lysine has two amine groups, which makes it overall basic because of the second isolated amine group (−(CH2)4NH2). Answer : (d)
Q.38
Which fatty acid is liquid at room temperature ... .... [ AMU 2012]
0%
a) Palmitic acid
0%
b) Stearic acid
0%
c) Arachidic acid
0%
d) Linoleic acid
Explanation
Unsaturated fats have one or more double bonds inside their fatty acid chains. The two carbons on the hydrocarbon molecules each have triple or double bonds, and hydrogens cannot saturate them. This makes the entire molecular structure weaker, so the substance stays liquid at room temperature. Linoleic acid is a doubly unsaturated fatty acid. Palmitic Acid, Stearic acid, Arachidic acid is a saturated long-chain fatty acid. Answer : (d)
Q.39
Ribozyme is ... .... [ BHU 2000 ]
0%
a) RNA with enzyme activity
0%
b) RNA without sugar
0%
c) RNA without phosphate
0%
d) RNA with extra phosphate
Explanation
A ribozyme is a ribonucleic acid (RNA) enzyme that catalyzes a chemical reaction. The ribozyme catalyses specific reactions in a similar way to that of protein enzymes. Answer : (a)
Q.40
Which is not true of enzymes .... ... [ WB 2012]
0%
a) They act on specific substrate
0%
b) They are made of fat and sugar
0%
c) They act at specific temperature
0%
d) They act at specific pH
Explanation
Chemically, enzymes are generally globular proteins. (Some RNA molecules called ribozymes can also be enzymes.) So Option 'b' statement is NOT correct Answer : (b)
Q.41
In nucleoside, nitrogen base is attached to pentose sugar at ... ....
0%
a) Carbon-5' of pentose sugar
0%
b) Carbon-1' of pentose sugar
0%
c) N-1 and N-9
0%
d) Both b and c
Explanation
Answer : (b)
Q.42
Energy released from enzyme-substrate interaction is ... ..[ EAMCET 1999]
0%
a) Activation energy
0%
b) Binding energy
0%
c) Constant energy
0%
d) Variable energy
Explanation
The binding energy is maximized since only the correct substrate can interact with an enzyme and is released when the enzyme facilitates formation of the transition state. Answer : (b)
Q.43
In which of the following form in glucose stored in liver .... ..... [ AFMC 2003]
0%
a) Cellulose
0%
b) Starch
0%
c) Glycogen
0%
d) Sucrose
Explanation
Liver glycogen stores serve as a store of glucose for use throughout the body, particularly the central nervous system. Answer : (c)
Q.44
A disaccharide that gives two molecules of glucose on hydrolysis is ... ... [ RPMT 2005]
0%
a) Sucrose
0%
b) Maltose
0%
c) Lactose
0%
d) Both b and c
Explanation
Maltose is hydrolyzed by the enzyme maltase to produce two molecules of d-glucose. Answer : (b)
Q.45
Which one is not disaccharide .... .... [ DPMT 2007]
0%
a) Lactose
0%
b) Sucrose
0%
c) Maltose
0%
d) Starch
Explanation
Monosaccharides are glucose, galactose, ribose, and glyceraldehyde. Disaccharides are Sucrose, Lactose, Maltose Trisaccharide are Nigerotriose, Maltotriose, Melezitose, Maltotriulose, Raffinose, Kestose Polysaccharides are Starch,Cellulose, Glycogen Answer : (d)
Q.46
Major portion of dry weight of a plant consists of elements .... .... [ CBSE 2003]
0%
a) Calcium, magnesium and sulphur
0%
b) Carbon, hydrogen and oxygen
0%
c) Carbon, nitrogen and hydrogen
0%
d) Nitrogen, phosphorus and potassium
Explanation
The dry weight is an estimate of a body or of a body samples weight when all water has been removed, means the weight of the sample, excluding the weight of the water in the sample. Carbon, hydrogen and oxygen together constitute about 94% of the total dry weight of the plant. Answer : (b)
Q.47
Nucleotides/nucleic acids occur in .... ... [ Har PMT 1994]
0%
a) Ribosomes
0%
b) Mitochondria
0%
c) DNA, RNA, chloroplasts and nucleus
0%
d) All the above
Explanation
nucleic acids are found in all life forms including within bacteria, archaea, mitochondria, chloroplasts, and viruses Nucleic acids, macromolecules made out of units called nucleotides, come in two naturally occurring varieties: deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material found in living organisms, Ribosome is composed of nucleic acids Answer : (d)
Q.48
A Storage proteins is ... ... [ CPMT 1999 ]
0%
a) Keratin
0%
b) Coliagen
0%
c) Haemoglobin
0%
d) Glutelin/Globulin
Explanation
Glutelins and globulin are Storage proteins deposited into protein storage vacuoles (PSVs) Answer : (d)
Q.49
Primary structure of protein is due to .... .... [ Pb PMT 2000 ]
0%
a) Hydrogen bonds
0%
b) Peptide bonds
0%
c) -S-S-linkages
0%
d) Ionic bonds
Explanation
The linear sequence of amino acids within a protein is considered the primary structure of the protein. Amino acids in proteins (or polypeptides) are joined together by peptide bonds. Answer : (b)
Q.50
Which is not protein? .... .... [ RPMT 1996]
0%
a) Myosin
0%
b) Actin
0%
c) Albumin
0%
d) Haematin
Explanation
Haematin a bluish-black compound derived from haemoglobin by removal of the protein part and oxidation of the iron atom. Myosins are a superfamily of motor proteins. Actin is a family of globular multi-functional proteins that form microfilaments Albumin, a type of protein that is soluble in water. Answer : (d)
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