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NEET • BIOLOGY • BIOMOLECULES
Biomolecules practice · Medium
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61
Medium
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Remembering
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Which of the following statements is wrong?
View answer and explanation
Correct option: C
Glycine is a sulphur containing amino acid
Option C (Glycine is a sulphur containing amino acid) is wrong because Glycine is the simplest amino acid and does not contain sulfur. Cysteine and Methionine are sulfur-containing amino acids.
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Understanding
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Hydrolysis of a glycosidic bond in a disaccharide is an example of
View answer and explanation
Correct option: C
Transformation of biomolecules
Option B (Hydrolysis of biomolecules) is correct because breaking a glycosidic bond by adding water is a hydrolysis reaction.
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Understanding
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Read the following statements and choose the correct option Statement A : Aspartic acid is the only know acidic amino acid Statement B : Methionine is an essential amino acid
View answer and explanation
Correct option: C
Only statement B is correct
The correct answer is C because aspartic acid is an acidic amino acid, but it's not the *only* one (glutamic acid is another). Methionine *is* an essential amino acid.
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Remembering
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In plants inulin and pectin are
View answer and explanation
Correct option: A
reserved food material
Option A (reserved food material) is correct because inulin and pectin are storage polysaccharides in plants.
65
Medium
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Remembering
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Jojoba contains
View answer and explanation
Correct option: B
Wax
Option B (Wax) is correct because Jojoba oil is primarily composed of wax esters, not triglycerides, sterols, or a mixture of wax and triglycerides.
66
Medium
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Analyzing
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Find out the odd one from the given pair.
View answer and explanation
Correct option: D
Polynucleotide – Hydrogen bond
Option C (0.32) is correct because in dsDNA, A=T and G=C. If C is 18%, G is also 18%. Therefore, A+T = 100 - (18+18) = 64%, so A = 32%.
67
Medium
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Remembering
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Maltose consists of which one of the following?
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Correct option: D
Glucose and glucose
Option D (Glucose and glucose) is correct because maltose is a disaccharide formed by two glucose molecules linked by an α-1,4-glycosidic bond.
68
Medium
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Understanding
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Which of the following statements about enzymes are correct?
I. Enzymes do not alter the overall change in free energy for a reaction
II. Enzymes are highly specific for reactions
III. The energy input needed to start a chemical reaction is called activation energy
IV. Enzymes are proteins whose three dimensional shape is key to their functions
I. Enzymes do not alter the overall change in free energy for a reaction
II. Enzymes are highly specific for reactions
III. The energy input needed to start a chemical reaction is called activation energy
IV. Enzymes are proteins whose three dimensional shape is key to their functions
View answer and explanation
Correct option: D
All of these
Option D (All of these) is correct because all the statements about enzymes are accurate and fundamental to their function.
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Analyzing
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(A) A + G / T + C ratio can be used to identify the sps.
(R) Purine and pyrimidine ratio changes with age (or) tissue
(R) Purine and pyrimidine ratio changes with age (or) tissue
View answer and explanation
Correct option: D
Both A and R are false
Option D is correct because the A+G/T+C ratio is always 1 in double-stranded DNA due to Chargaff's rules, and this ratio does not change with age or tissue.
70
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Understanding
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The substances which are not true bio-macromolecules but present as a structural component in all biological membranes are
View answer and explanation
Correct option: C
Lipids
Option C (Lipids) is correct because lipids are structural components of all biological membranes, even though they aren't true macromolecules.
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Remembering
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The left handed DNA is called
View answer and explanation
Correct option: C
Z-DNA
Option C (Z-DNA) is correct because Z-DNA is a left-handed double helix, unlike the more common right-handed B-DNA.
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Analyzing
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Assertion: In a DNA molecule, A–T rich parts melt before G–C rich parts.
Reason: In between A and T there are three H–bond, whereas in between G and C there are two H–bonds.
Reason: In between A and T there are three H–bond, whereas in between G and C there are two H–bonds.
View answer and explanation
Correct option: C
If Assertion is true but Reason is false
Option C is correct because while the assertion is true (A-T rich parts melt before G-C rich parts), the reason is false (A-T has two H-bonds, G-C has three).
73
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Understanding
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Which one of the following biomolecules is correctly characterized?
View answer and explanation
Correct option: A
Lecithin – A phosphorylated glyceride found in cell membrane
Option A (Lecithin – A phosphorylated glyceride found in cell membrane) is correctly characterized because lecithin is indeed a phospholipid present in cell membranes.
74
Medium
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Remembering
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Variety of amino acids are formed on the basis of
View answer and explanation
Correct option: D
Nature of R group
Option D (Nature of R group) is correct because the variety of amino acids is determined by the different chemical structures of their R-groups (side chains).
75
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Analyzing
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Assertion : Comparative biochemistry provides
a strong evidence in favour of common ancestory
of living beings.
Reason : Genetic code is universal.
a strong evidence in favour of common ancestory
of living beings.
Reason : Genetic code is universal.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason
is not the correct explanation of Assertion
is not the correct explanation of Assertion
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because comparative biochemistry does provide evidence for common ancestry, and the genetic code is universal, but the universality of the genetic code doesn't directly explain why comparative biochemistry provides evidence for common ancestry.
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76
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Understanding
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Many physiological functions are performed by proteins. One such function involves that some proteins discharge
View answer and explanation
Correct option: B
Hormones
Option B (Hormones) is correct because some proteins function as hormones, which are signaling molecules that regulate physiological processes.
77
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Understanding
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(A) Starch gives blue colour with iodine
(R) Starch forms helical secondary structure and holds iodine in the helical portion
(R) Starch forms helical secondary structure and holds iodine in the helical portion
View answer and explanation
Correct option: A
Both A and R are true, R is the correct explanation of A
Option A (Both A and R are true, R is the correct explanation of A) is correct because starch does give a blue color with iodine due to the iodine molecules being held within the helical structure of starch.
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Understanding
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then it is
View answer and explanation
Correct option: D
dsDNA
Option D (dsDNA) is correct because in double-stranded DNA (dsDNA), the amount of adenine (A) equals the amount of thymine (T), and the amount of guanine (G) equals the amount of cytosine (C). Therefore, A + G = C + T.
79
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Remembering
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Exoskelton of arthropods is made by?
View answer and explanation
Correct option: B
Chitin
Option B (Chitin) is correct because the exoskeleton of arthropods is primarily made of chitin, a polysaccharide.
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Remembering
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For nucleic acids, the building block is a
View answer and explanation
Correct option: A
Nucleotide
Option A (Nucleotide) is correct because nucleotides are the monomers, or building blocks, of nucleic acids (DNA and RNA).
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Understanding
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Hydrogen bonds, peptide bonds, disulphide bridges are present in
View answer and explanation
Correct option: C
Tertiary structure of protein
Option C is correct because hydrogen bonds, peptide bonds, and disulfide bridges are all present in the tertiary structure of proteins, contributing to its 3D shape.
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Understanding
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Find out the correct match.
View answer and explanation
Correct option: C
Cellulose – Component of cell wall
Option C (Cellulose – Component of cell wall) is correct because cellulose is a major structural component of plant cell walls.
83
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Remembering
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Nitrogen bases in a DNA double helix are bonded by?
View answer and explanation
Correct option: C
Hydrogen bonds
Option C (Hydrogen bonds) is correct because hydrogen bonds hold the nitrogenous bases together in a DNA double helix.
84
Medium
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Understanding
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Which of the following statements regarding enzyme inhibition is correct?
View answer and explanation
Correct option: C
Competitive inhibition is seen when the substrate and the inhibitor compete
Option C is correct because competitive inhibition directly involves the substrate and inhibitor competing for the enzyme's active site.
85
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Understanding
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Lipid are found in acid insoluble fraction during the analysis of chemical composition of tissues. Given the reason
View answer and explanation
Correct option: D
On grinding, the biomembranes are broken into pieces and form insoluble vesicles
Option D (On grinding, the biomembranes are broken into pieces and form insoluble vesicles) is correct because lipids form membranes, which break into vesicles during grinding and are thus insoluble.
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Remembering
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Answer briefly
I. Which colour glycogen gives on its reaction with iodine solution?
II. What is satellite DNA?
III. Name three components of a nucleotide molecule
Correct option will all answers is
I. Which colour glycogen gives on its reaction with iodine solution?
II. What is satellite DNA?
III. Name three components of a nucleotide molecule
Correct option will all answers is
View answer and explanation
Correct option: B
I-Red
II-Repetitive base pairs
III-Phosphoric acid, pentose sugar and nitrogenous organic base
II-Repetitive base pairs
III-Phosphoric acid, pentose sugar and nitrogenous organic base
Option B (I-Red, II-Repetitive base pairs, III-Phosphoric acid, pentose sugar and nitrogenous organic base) is correct because glycogen gives a red color with iodine, satellite DNA consists of repetitive base pairs, and a nucleotide consists of phosphoric acid, a pentose sugar, and a nitrogenous base.
87
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Remembering
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A nucleotide has three chemically distinct compounds. These are A, B and C
Choose the correct option for A, B and C
Choose the correct option for A, B and C
View answer and explanation
Correct option: C
A-Heterocyclic compound, B-Monosaccharide, C-a phosphate
Option C (A-Heterocyclic compound, B-Monosaccharide, C-a phosphate) is correct because a nucleotide consists of a nitrogenous base (heterocyclic compound), a pentose sugar (monosaccharide), and a phosphate group.
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Analyzing
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Identify the number of correct statements from the following w.r.t respiration as amphibolic pathway.
A. Fats would need to be broken down into glycerol and fatty acids first before entering the respiratory pathway.
B. The proteins would be degraded to individual amino acids and enter the respiratory pathway only through Krebs' cycle.
C. If fatty acids were to be respired, they would first be degraded to pyruvate and enter the respiratory pathway.
D. Glycerol would enter the respiratory pathway after being converted to PGAL.
A. Fats would need to be broken down into glycerol and fatty acids first before entering the respiratory pathway.
B. The proteins would be degraded to individual amino acids and enter the respiratory pathway only through Krebs' cycle.
C. If fatty acids were to be respired, they would first be degraded to pyruvate and enter the respiratory pathway.
D. Glycerol would enter the respiratory pathway after being converted to PGAL.
View answer and explanation
Correct option: B
2
Option B (2) is correct. Statements A and D are correct, while B and C are incorrect regarding respiration as an amphibolic pathway.
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Application
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If the total amount of adenine and thymine in a double-stranded DNA is 60%, then the amount of guanine in this DNA will be
View answer and explanation
Correct option: B
0.2
Option B (0.2) is correct because if A+T is 60%, then G+C is 40%, and since G=C, guanine is 20%.
90
Medium
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Remembering
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Silk consists of
View answer and explanation
Correct option: B
Central core of fibroin
Option B (Central core of fibroin) is correct because silk primarily consists of a central core of fibroin protein.
Revision notes and key takeaways
Review BIOMOLECULES in your textbook or class notes, then use this set to check your understanding.
Showing 61-90 of 142 questions