Biomolecules are essential parts of all living things. They include important compounds like carbohydrates, proteins, nucleic acids, and lipids. These molecules are crucial for the structure and function of our cells and bodies.
For Class 12 students, understanding biomolecules is a key part of biology and chemistry. This set of Biomolecules Class 12 MCQs with answers will help you review and test your knowledge of biomolecules. The questions cover different topics, such as the types of biomolecules, their structures, and their roles in living organisms. Each question comes with an answer and an explanation to help you learn and understand better.
Whether you are studying for your board exams or preparing for entrance tests, these Biomolecules Class 12 MCQs will be a valuable tool to help you succeed.
Biomolecules Class 12 MCQ with Answers
Ques. Which of the following gives positive Fehling solution test?
a) Protein
b) Sucrose
c) Glucose
d) Fats
Answer: c
Ques. Which of the following statements is incorrect regarding glucose?
a) It is an aldohexose.
b) It is also known as dextrose
c) It is monomer of cellulose.
d) It is the least abundant organic compound on earth.
Answer: d
Ques. Glucose gives silver mirror test with Tollen’s reagent. It shows the presence of:
a) Acidic group
b) Alcoholic group
c) Ketonic group
d) Aldehyde group
Answer: d
Ques. The symbols D and L represents:
a) The optical activity of compounds.
b) The relative configuration of a particular stereoisomer.
c) The dextrorotatory nature of molecule.
d) The levorotatory nature of molecule
Answer: b
Ques. The function of glucose is to:
a) Provides energy
b) Promote growth
c) Prevent diseases
d) Perform all above
Answer: a
Also Check: Importance of Biomolecules
Ques. Which one of the following compounds is different from the rest?
a) Sucrose
b) Maltose
c) Lactose
d) Glucose
Answer: d
Ques. The two functional groups present in a typical carbohydrate are:
a) – CHO and – COOH
b) > C = O and – OH
c) – OH and – CHO
d) – OH and – COOH
Answer: c
Ques. When glucose reacts with bromine water, the main product is:
a) Gluconic acid
b) Glyceraldehyde
c) Saccharic acid
d) Acetic acid
Answer: a
Ques. Glucose does not react with:
a) Br2/H2O
b) H2NOH
c) HI
d) NaHSO3
Answer: d
Ques. Glucose reacts with acetic anhydride to form:
a) Monoacetate
b) Tetra-acetate
c) Penta-acetate
d) Hexa-acetate
Answer: c
Ques. Biomolecules are:
a) Aldehydes and ketones
b) Acids and esters
c) Carbohydrates, proteins and fats
d) Alcohols and phenols
Answer: c
Ques. Which of the following is a disaccharide?
a) Lactose
b) Starch
c) Cellulose
d) Fructose
Answer: a
Also Check: Classification of Biomolecules
Ques. The sugar that is characteristic of milk is:
a) Maltose
b) Ribose
c) Lactose
d) Galactose
Answer: c
Ques. Which one is a disaccharide?
a) Glucose
b) Fructose
c) Xylose
d) Sucrose
Answer: d
Ques. Which of the following monosaccharide is pentose?
a) Glucose
b) Fructose
c) Arabinose
d) Galactose
Answer: c
Ques. The commonest disaccharide has the molecular formula:
a) C10H18O9
b) C10H20O10
c) C18H22O11
d) C12H22O11
Answer: d
Ques. Monosaccharides usually contains … carbon atoms:
a) C3 to C10
b) C1 to C6
c) C4 to C10
d) C5 to C8
Answer: a
Ques. Which one of the following compounds is found abundantly in nature?
a) Fructose
b) Starch
c) Glucose
d) Cellulose
Answer: d
Also Check: Class 12 Chemistry Biomolecules Notes
Ques. A carbohydrate that cannot be hydrolysed into simpler units is called:
a) Polysaccharides
b) Trisaccharides
c) Disaccharides
d) Monosaccharides
Answer: d
Which of the following statements is incorrect?
a) Maltose gives two molecules of glucose only.
b) Cellulose and sucrose are polysaccharide.
c) Polysaccharides are not sweet in taste.
d) Polysaccharides are also known as non-sugars.
Answer: b
Ques. Reducing sugars reduce:
a) Only Fehling’s solution
b) Only Tollen’s solution
c) Both (a) & (b)
d) Neither (a) nor (b)
Answer: c
Ques. Which among the following is the simplest sugar?
a) Glucose
b) Starch
c) Cellulose
d) None of these
Answer: a
Ques. Glucose can’t be classified as:
a) Hexose
b) Carbohydrate
c) Aldose
d) Oligosaccharide
Answer: d
Ques. Which of the following properties of glucose cannot be explained by its open chain structure?
i) Glucose does not form hydrogen sulphite with NaHSO3
ii) On oxidation with HNO3 glucose gives saccharic acid.
iii) Glucose is found to exist in two different crystalline forms which are named as α and β.
a) (ii) only
b) (i) and (iii)
c) (ii) and (iii)
d) (i) and (ii)
Answer: b
Ques. Glucose is found to exist in two different α and β crystalline forms. These forms can be obtained by:
i) The α form of glucose is obtained by crystallisation from concentrated solution of glucose at 303 K.
ii) The β form of glucose is obtained by crystallisation from concentrated solution of glucose at 303 K.
iii) The β form is obtained by crystallisation from hot and saturated aqueous solution at 371 K.
iv) The α form is obtained by crystallisation from hot and saturated aqueous solution at 371 K.
a) (i) and (iii)
b) (ii) and (iv)
c) (ii) and (iii)
d) (i) only
Answer: b
Also Check: Class 12 Important Question on Biomolecules
Ques. Reduction of glucose by HI suggest that:
a) Presence of OH groups
b) Presence of –CHO group
c) Cyclic structure of glucose
d) Six carbon atoms are arranged in straight chain
Answer: d
Ques. The reaction of glucose with red P + HI is called:
a) Sandmeyer’s reaction
b) Reformatsky reaction
c) Gattermann’s reaction
d) Reduction
Answer: d
Ques. Which of the following reactions of glucose can be explained only by its cyclic structure?
a) Glucose forms pentaacetate
b) Glucose reacts with hydroxylamine to form an oxime
c) Pentaacetate of glucose does not react with hydroxylamine
d) Glucose is oxidised by nitric acid to gluconic acid
Answer: c
Ques. Which is the least stable form of glucose?
a) α-D-Glucose
b) β-D-Glucose
c) Open chain structure
d) All are equally stable
Answer: c
Ques. Isomerization of glucose produces:
a) Galactose
b) Fructose
c) Mannose
d) Allose
Answer: b
Ques. A solution of D-glucose in water rotates the plane polarised light:
a) To the right
b) To the left
c) To either side
d) None of these
Answer: a
Ques. The number of chiral carbon atoms present in cyclic structure α-D(+) glucose:
a) 3
b) 4
c) 5
d) 6
Answer: c
Ques. The α-D glucose and β-D glucose differ from each other due to difference in carbon atom with respect to its:
a) Conformation
b) Configuration
c) Number of OH groups
d) Size of hemiacetal ring
Answer: b
Ques. The two forms of D-glucopyranose obtained from the solution of D-glucose are called:
a) Isomers
b) Anomers
c) Epimers
d) Enantiomers
Answer: b
