Biomolecules (11 Dec) - Live Session - NEET 2020Contact Number: 8527521718Biomolecules (11 Dec) - Live Session - NEET 2020Contact Number: 8527521718Which of the following are not polymeric?
(1) Nucleic acids
(2) Proteins
(3) Polysaccharides
(4) Lipids
Which one of the following statements is correct, with reference to enzymes?
(1) Apoenzyme = Holoenzyme + Coenzyme
(2) Holoenzyme = Apoenzyme + Coenzyme
(3) Coenzyme = Apoenzyme + Holoenzyme
(4) Holoenzyme = Coenzyme + Cofactor
A non-proteinaceous enzyme is
(1) Lysozyme
(2) Ribozyme
(3) Ligase
(4) Deoxyribonuclease
Which of the following is the least likely to be involved in stabilizing the three-dimensional
folding of most proteins?
(1) Hydrogen bonds
(2) Electrostatic interaction
(3) Hydrophobic interaction
(4) Ester bonds
Which of the following describes the given graph correctly?
(1) Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme
(2) Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme
(3) Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme
(4) Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme
A typical fat molecule is made up of
(1) Three glycerol and three fatty acid molecules
(2) Three glycerol molecules and one fatty acid molecule
(3) One glycerol and three fatty acid molecules
(4) One glycerol and one fatty acid molecule
Which one of the following statements is wrong?
(1) Glycine is a sulphur containing amino acid
(2) Sucrose is a disaccharide
(3) Cellulose is a polysaccharide
(4) Uracil is a pyrimidine
Which of the following biomolecules does have a phosphodiester bond?
(1) Nucleic acids in a nucleotide
(2) Fatty acids in a diglyceride
(3) Monosaccharides in a polysaccharide
(4) Amino acids in a polypeptide
The chitinous exoskeleton of arthropods is formed by the polymerisation of
(1) Lipoglycans
(2) Keratin sulphate and chondroitin sulphate
(3) D-glucosamine
(4) N-acetyl glucosamine
Which one of the following is not applicable to RNA?
(1) Chargaff's rule
(2) Complementary base pairing
(3) 5' phosphoryl and 3' hydroxyl ends
(4) Heterocyclic nitrogenous bases
In sea urchin DNA, which is double stranded 17% of the bases were shown to be cytosine.
The percentages of the other three bases expected to be present in this DNA are
(1) G 8.5%, A 50%, T 24.5%
(2) G 34%, A 24.5%, T 24.5%
(3) G 17%, A 16.5%, T 32.5%
(4) G 17%, A 33%, T 33%
Which one of the following statements is incorrect?
(1) The presence of the competitive inhibitor decreases the Km of the enzyme for the
substrate
(2) A competitive inhibitor reacts reversibly with the enzyme to form an enzyme-inhibitor
complex
(3) In competitive inhibition, the inhibitor molecule is not chemically changed by the
enzyme
(4) The competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate
complex
Select the option which is not correct with respect to enzyme action:
(1) Substrate binds with enzyme at its active site
(2) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase
by malonate
(3) A non - competitive inhibitor binds the enzyme at a site distinct from that which binds
the substrate
(4) Malonate is a competitive inhibitor of succinic dehydrogenase
Which one of the following is a non - reducing carbohydrate?
(1) Maltose
(2) Sucrose
(3) Lactose
(4) Ribose 5-phosphate
A phosphoglyceride is always made up of:
(1) Only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate
group is also attached
(2) A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate
group is also attached
(3) A saturated or unsaturated fatty acid esterified to a phosphate group which is also attached
to a glycerol molecule
(4) Only a saturated fatty acid esterified to a glycerol molecule to which a phosphate
group is also attached
The essential chemical components of many coenzymes are:
(1) Nucleic acids
(2) Carbohydrates
(3) Vitamins
(4) Proteins
Transition state structure of the substrate formed during an enzymatic reaction is :
(1) Permanent but unstable
(2) Transient and unstable
(3) Permanent and stable
(4) Transient but stable
Macromolecule chitin is
(1) Phosphorus containing polysaccharide
(2) Sulphur containing polysaccharide
(3) Simple polysaccharide
(4) Nitrogen containing polysaccharide
Which one out of A – D given below correctly represents the structural formula of the
basic amino acid?
(1) A
(2) B
(3) C
(4) D
Given below is the diagrammatic representation of one of the categories of small molecular
weight organic compounds in the living tissues. Identify the category shown and the one blank
component “X” in it
Category Component
(1) Nucleotide Adenine
(2) Nucleoside Uracil
(3) Cholesterol Guanin
(4) Amino acid
For its activity, carboxypeptidase requires
(1) Copper
(2) Zinc
(3) Iron
(4) Niacin
Which one of the following biomolecules is correctly characterised?
(1) Alanine amino acid – Contains an amino group and an acidic group
anywhere in the molecule
(2) Lecithin – a phosphorylated glyceride found in cell membrane
(3) Palmitic acid – an unsaturated fatty acid with 18 carbon atoms
(4) Adenylic acid – adenosine with a glucose phosphate molecule
The curve given below show enzymatic activity with relation to three conditions (pH,
temperature and substrate concentration)
What do the two axes (x and y) represent?
x-axis y-axis
(1) Enzymatic activity Temperature
(2) Enzymatic activity pH
(3) Temperature Enzyme activity
(4) Substrate concentration Enzymatic activity
Which one of the following structural formulae of two organic compound is correctly
identified along with its related function
A.
B.
(1) A : Lecithin – a component of cell membrane
(2) B : Adenine – a nucleotide that makes up nucleic acids
(3) A : Triglyceride – major source of energy
(4) B : Uracil – a component of DNA
The figure given below shows the conversion of a substrate into product by an enzyme. In
which one of the four options (1–4) the components of reaction labelled as A, B, C and D are
identified correctly?
A B C D
(1) Potential energy Transition state Activation energy Activation energy
with enzyme without enzyme
(2) Transition state Potential energy Activation energy Activation energy
without enzyme with enzyme
(3) Activation energy Transition state Activation energy Potential energy
without enzyme with enzyme
(4) Activation energy Transition state Activation energy Potential energy
with enzyme without enzyme
Three of the following statements about enzymes are correct and one is wrong. Which
one is wrong?
(1) Enzymes require optimum pH for maximal activity
(2) Enzymes are denatured at high temperature but in certain exceptional organisms
they are effective even at temperatures 80°-90°C
(3) Enzymes are highly specific
(4) Most enzymes are proteins but some are lipids
Which one of the following pairs is wrongly matched?
(1) Alcohol – Nitrogenase
(2) Fruit juice – Pectinase
(3) Textile – Amylase
(4) Detergents – Lipase
Carbohydrates are commonly found as starch in plant storage organs. Which
of the following five properties of starch (a - e) make it useful as a storage material?
a. Easily translocated
b. Chemical non-reactive
c. Easily digested by animals
d. Osmotically inactive e. Synthesized during photosynthesis
The useful properties are
(1) Both a & e
(2) Both b & c
(3) Both b & d
(4) a, c & e
An organic substance bound to an enzyme and essential for its activity is called
(1) Coenzyme
(2) Holoenzyme
(3) Apoenzyme
(4) Isoenzyme
Telomerase is an enzyme which is a :
(1) Repetitive DNA
(2) RNA
(3) Simple protein
(4) Ribonucleoprotein
Which of the following is the simplest amino acid?
(1) Tyrosine
(2) Asparagine
(3) Glycine
(4) Alanine
Enzymes, vitamins and hormones can be classified into a single category of biological
chemicals, because all of these
(1) Enhance oxidative metabolism
(2) Are conjugated proteins
(3) Are exclusively synthesized in the body of a living organism as at present
(4) Help in regulating metabolism
Carbohydrates, the most abundant biomolecules on earth, are produced by
(1) All bacteria, fungi and algae
(2) Fungi, algae and green plant cells
(3) Some bacteria, algae and green plant cells
(4) Viruses, fungi and bacteria
Which of the following statements regarding enzyme inhibition is correct ?
(1) Non-competitive inhibition of an enzyme can be overcome by adding large amount
of substrate
(2) Competitive inhibition is seen when a substrate competes with an enzyme for binding
to an inhibitor protein
(3) Competitive inhibition is seen when the substrate and the inhibitor compete
(4) Non-competitive inhibitors often bind to the enzyme irreversibly
The catalytic efficiency of two different enzymes can be compared by the
(1) The value
(2) The pH optimum value
(3) Formation of the product
(4) Molecular size of the enzyme
The four elements that make up 96% of all the elements found in a living system are
(1) C, H, O and P
(2) C, N, O and P
(3) H, O, C and N
(4) C, H, O and S
High cholesterol patients are advised to use
(1) Ghee, butter and oils
(2) Groundnut oil, margarine and vegetable oils
(3) Fatty oil and butter
(4) Cheese, dalda and ghee
Essential amino acid is
(1) Phenylalanine
(2) Glycine
(3) Aspartic acid
(4) Serine
Lipids are insoluble in water because lipid molecules are
(1) Hydrophilic
(2) Hydrophobic
(3) Neutral
(4) Zwitter ions
The major role of minor elements inside living organisms is to act as
(1) Co-factors of enzymes
(2) Building blocks of important amino acids
(3) Constituents of hormones
(4) Binders of cell structure
Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
1. Base-sugar-phosphate
2. Base-sugar-OH
3. (Base-sugar-phosphate
4. Sugar-phosphate
About 98 percent of the mass of every living organism is composed of just six elements
including carbon, hydrogen, nitrogen, oxygen and
(1) Sulphur and magnesium
(2) Magnesium and sodium
(3) Calcium and phosphorus
(4) Phosphorus and sulphur
Which of the following is a neutral amino acid?
(1) Glutamine
(2) Arginine
(3) Valine
(4) Asparagine
The most unsaturated fatty acid is
(1) Linoleic acid
(2) Oleic acid
(3) Linolenic acid
(4) Arachidonic acid
Which of the following is a nucleotide?
| 1. | Thymidine | 2. | Cytosine |
| 3. | Thiamine | 4. | Uridylic acid |
Which of the following is incorrect regarding the amino acids and their functions?
(1) Tyrosine : Converted into epinephrine hormone and used in the synthesis of
melanin pigment
(2) Glycine : Involved in the formation of heme
(3) Tryptophan : Helps in the synthesis of auxin hormone
(4) Histidine : Can be converted into histamine by the removal of amino group
Which of the following is the diagrammatic representation of phospholipid lecithin?
(1)
(2)
(3)
(4)
Which of the following is not a secondary metabolite of plant cell?
(1) Rubber
(2) Chlorophyll
(3) Essential oil
(4) Tannins
The most abundant molecule in cell is
(1) Water
(2) Carbohydrate
(3) Lipid
(4) Protein
Which are the most diverse molecules in the cell?
(1) Lipids
(2) Mineral salts
(3) Proteins
(4) Carbohydrates
