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NEET MDS Mock Test. We covered all the NEET MDS Mock Test in this post for free so that you can practice well for the exam.
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MCQ on Biology Biomolecules for NEET Students
Which combination forms a nucleotide?
a) Base and sugar
b) Sugar with phosphoric acid
c) Base, sugar, and phosphoric acid
How do D-glucose and D-fructose differ in their open-chain forms?
a) They differ in the position of the hydroxyl group on carbon 5
b) Glucose is an aldose, while fructose is a ketose
c) Glucose contains more hydrogen and less oxygen compared to fructose
d) Glucose has five –OH groups, while fructose has only four
Option b – Glucose is an aldose, while fructose is a ketose
Which vitamin dissolves in water?
a) Vitamin A
b) Vitamin E
c) Vitamin B
d) Vitamin D
Option c – Vitamin B
Which amino acid has an oxygen atom in its R group?
a) Serine
b) Isoleucine
c) Methionine
d) Cysteine
Option a – Serine
Which compound contains the element cobalt?
a) Hemoglobin
b) Chlorophyll
c) Vitamin B12
d) Vitamin C
Option c – Vitamin B12
Glucose pentaacetate fails to react with hydroxylamine. What does this suggest?
a) It contains a free aldehyde group
b) It lacks a free aldehyde group
c) It includes a primary alcohol group
d) It lacks a primary alcohol group
Option b – It lacks a free aldehyde group
How many among sucrose, maltose, lactose, glucose, and cellobiose are non-reducing sugars?
a) One
b) Two
c) Three
d) Four
Option a – One
Which pair consists of aldose sugars?
a) Erythrulose and ribulose
b) Glucose and ribulose
c) Fructose and ribose
d) Galactose and ribose
Option d – Galactose and ribose
Assertion: Our body cannot store Vitamin K. Reason: Vitamin K is a fat-soluble vitamin.
a) Both Assertion and Reason are true, and Reason explains the Assertion
b) Both Assertion and Reason are true, but Reason doesn’t explain the Assertion
c) Assertion is true, Reason is false
d) Assertion is false, Reason is true
Option d – Assertion is false, Reason is true
Collagen belongs to which category?
a) Enzyme
b) Protein
c) Lipid
d) Hormone
Option b – Protein
Which statement correctly describes adenine and guanine?
a) They are heterocyclic bases with purine rings
b) They are homocyclic bases with benzene rings
c) Both have identical molecular formulas
d) Both contain two double bonds between carbon atoms
Option a – They are heterocyclic bases with purine rings
Which carbohydrate plays a structural role in plant tissues?
a) Starch
b) Cellulose
c) Glucose
d) Glycogen
Option b – Cellulose
Which of the following responds positively to the phthalein test?
a) Leucine
b) Lysine
c) Serine
d) Tyrosine
Option d – Tyrosine
Deficiency of which vitamin causes tongue inflammation and cheilosis?
a) Vitamin A
b) Thiamine
c) Riboflavin
d) Ascorbic acid
Option c – Riboflavin
What is the process by which RNA directs the production of proteins in living organisms?
a) Transcription
b) Mutation
c) Replication
d) Translation
Option d – Translation
What does the primary structure of a protein represent?
a) Denatured protein and its prosthetic group structure
b) Three-dimensional arrangement involving distant amino acid interactions
c) The sequence of amino acids in a polypeptide chain
d) Repetitive folding segments of the polypeptide chain
Option c – The sequence of amino acids in a polypeptide chain
How many peptide bonds are present in a pentapeptide?
a) 3
b) 4
c) 5
d) 6
Option b – 4
What is the prosthetic group found in glycoproteins?
a) Lipid
b) Carbohydrate
c) Protein
d) Nucleic acid
Option b – Carbohydrate
Which of the following amino acids is neutral?
a) Glutamic acid
b) Valine
c) Histidine
d) Lysine
Option b – Valine
Identify the carbohydrate that yields only glucose upon hydrolysis.
a) Stachyose
b) Lactose
c) Cellulose
d) Raffinose
Option c – Cellulose
Which vitamin is categorized under the aromatic series based on structure?
a) Vitamin A
b) Vitamin K
c) Vitamin C
d) Vitamin B₁
Option b – Vitamin K
From the following, which compounds can exist as zwitterions?
I. Glycine
II. Sulphanilic acid
III. Benzoic acid
a) I, II and III
b) I and II
c) II and III
d) I and III
Option b – I and II
Which amino acid forms a yellow oily N-nitrosoamine when treated with cold HNO₂?
a) Alanine
b) Proline
c) Isoleucine
d) Valine
Option b – Proline
Which amino acid(s) has a very low isoelectric point (below 5)?
I. Histidine
II. Aspartic acid
III. Glutamic acid
IV. Arginine
a) I and II
b) II and III
c) III and IV
d) I and IV
Option b – II and III
When glucose is heated with HI, it forms compound X. When reacted with hydroxylamine, it gives compound Y. What are X and Y?
a) X = n-Hexane; Y = Glucoxime
b) X = n-Hexane; Y = Gluconic acid
c) X = Gluconic acid; Y = n-Hexane
d) X = Glucoxime; Y = Gluconic acid
Option a – X = n-Hexane; Y = Glucoxime
Which compound resembles amylopectin in structure but is more highly branched?
a) Cellulose
b) Lactose
c) Cellobiose
d) Glycogen
Option d – Glycogen
How many carbon atoms are present in a raffinose molecule?
a) 6
b) 12
c) 18
d) 24
Option c – 18
Which of the following is an essential amino acid?
a) Alanine
b) Methionine
c) Aspartic acid
d) Proline
Option b – Methionine
How much water is used during acid hydrolysis of 1.368 kg of maltose? (Molar mass: maltose = 342, water = 18, density of water = 1 g/cm³)
a) 0.072 dm³
b) 0.720 dm³
c) 0.18 dm³
d) 0.018 dm³
Option a – 0.072 dm³
Identify the substance that is NOT a hormone.
a) Threonine
b) Thyroxine
c) Adrenaline
d) Androsterone
Option a – Threonine
How many chiral centers are found in the open-chain forms of D-glucose and D-fructose?
a) 4 in each
b) 3 in each
c) 4 in glucose and 3 in fructose
d) 3 in glucose and 4 in fructose
Option c – 4 in glucose and 3 in fructose
All of the following are fibrous proteins except:
a) Fibroin
b) Keratin
c) Collagen
d) Insulin
Option d – Insulin
Which of the following amino acids lacks an aromatic ring?
a) Tyrosine
b) Phenylalanine
c) Tryptophan
d) Asparagine
Option d – Asparagine
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