CBSE Class 11 Biology Biomolecules MCQs Set 02

Practice MCQs for Class 11 Biology Chapter 09 Biomolecules

Review structured MCQ sets for Class 11 Biology Chapter 09 Biomolecules. Built according to official CBSE guidelines, these downloadable questions support daily revision and core concept reinforcement.

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View or download the dedicated Chapter 09 Biomolecules MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.

Question : Two free ribonucleotide units are interlinked with 
a) peptidebond
b) covalent bond
c) hydrogen bond
d) phosphodiester bond

Question : Most diverse macromolecules, found in the cell both physically and chemically are
a) proteins
b) carbohydrates
c) nucleic acids
d) lipids

Question : The nitrogenous organic base purine occurring in RNA is 
a) cytosine
b) thymine
c) guanine
d) uracil
 
Question : In which one of the following groups, all the three are examples of polysaccharides?
a) Starch, glycogen, cellulose
b) Sucrose, maltose, glucose
c) Glucose, fructose, lactose
d) Galactose, starch, sucrose
 
Question : What is common among amylase, rennin and trypsin? 
a) These are all proteins
b) These are proteolytic enzymes
c) These are produced in stomach
d) These act at a pH lower than 7
 
Question : Cofactor (coenzyme) is a part of holoenzyme it is 
a) loosely attached inorganic part
b) accessory non-protein substance attached firmly
c) loosely attached organic part
d) None of the above
 
Question : Genes are packaged into a bacterial chromosome by 
a) histones
b) basic proteins
c) acidic proteins
d) actin
 
Question : The RNA that picks up specific amino acids from the amino acid pool in the cytoplasm to ribosome during protein synthesis is called
a) mRNA
b) tRNA
c) rRNA
d) carrier RNA
 
Question : Protein synthesis in an animal cell takes place 
a) only in the cytoplasm
b) in the nucleolus as well as in cytoplasm
c) in cytoplasm as well as in mitochondria
d) only on ribosomes attached to the nuclear envelope
 
Question : DNA synthesis can be specifically measured by estimating the incorporation of radio labelled 
a) uraci
b) adenine
c) thymidine
d) deoxyribose sugar
 
Question : Lactose is composed of
a) glucose + glucose
b) glucose + fructose
c) fructose + galactose
d) glucose + galactose
 
Question : Radioactive thymidine when added to the medium surrounding living mammalian cells gets incorporated into the newly synthesized DNA. Which of the following types of chromatin is expected to become radioactive if cells are exposed radioactive thymidine as soon as they enter the S-phase?
a) Heterochromatin
b) Euchromatin
c) Both a) and b)
d) Neither heterochromatin nor euchromatin but only the nucleolus
 
Question : Cellulose, the most important constituent of plant cell wall is made of
a) unbranched chain of glucose molecules linked by α 1, 4 glycosidic bond
b) branched chain of glucose molecules linked by β 1, 4 glycosidic bond in straight chain and α 1,6 glycosidic bond at the site of branching
c) unbranched chain of glucose molecules linked by β 1, 4 glycosidic bond
d) branched chain of glucose molecules  linked by  α 1, 6 glycosidic bond at the site of branching
 
Question : Which one of the following statements about cytochrome 450 is wrong? 
a) It contains iron
b) It is a coloured cell
c) It has an important role in metabolism
d) It is an enzyme involved in oxidation reactions
 
Question : Which is an essential amino acid? 
a) Serine
b) Aspartic acid
c) Glycine
d) Phenylalanine
 
Question : ATP is a 
a) nucleotide
b) nucleosome
c) nucleoside
d) purine
 
Question : Conjugated proteins containing carbohydrates as prosthetic group are known as
a) chromoproteins
b) glycoproteins
c) lipoproteins
d) nucleoproteins
 
Question : Enzymes are absent in 
a) algae b) fungi
c) cyanobacteria
d) viruses
 
Question : Enzymes enhance the rate of reaction by 
a) forming a reactant-product complex
b) changing the equilibrium point of the reaction
c) combining with the product as soon as it is formed
d) lowering the activation energy of the reaction
 
Question : Feedback inhibition of an enzymatic reaction is caused by
a) end product
b) substrate
c) enzyme
d) rise in temperature
 
Question : Length of one turn of the helix in a B-form DNA is approximately 
a) 3.4 nm
b) 2nm
c) 0.34 nm
d) 20 nm
 
Question : The transfer RNA molecule in 3D appears 
a) L-shaped
b) E-shaped
c) Y-shaped
d) S-shaped
 
Question : One of the similarities between DNA and RNA is that both 
a) are polymers of nucleotides
b) are capable of replicating
c) have similar sugars
d) have similar pyrimidine bases
 
Question : Due to discovery of which of the following in 1980 the evolution was termed as RNA world? 
a) mRNA, tRNA, rRNA synthesize proteins
b) In some virus RNA is genetic material
c) RNA have enzymatic property
d) RNA is not found in all cells
 
Question : Cytochrome is 
a) metallo flavoprotein
b) Fe containing porphyrin pigment
c) glycoprotein
d) lipid
 
Question : Types of RNA polymerase required in nucleus for RNA synthesis 
a) 1
b) 2
c) 3
d) 4
 
Question : Spoilage of oil can be detected by which fatty acid? 
a) Oleic acid
b) Linolenic acid
c) Linoleic acid
d) Erucic acid
 
Question : In plants, inulin and pectin are 
a) reserve materials
b) wastes
c) excretory material
d) insect-attracting material
 
Question : Enzyme first used for nitrogen fixation is 
a) nitrogenase
b) nitroreductase
c) transferase
d) transaminase
 
Question : Most abundant organic compound on earth is 
a) protein
b) cellulose
c) lipids
d) steroids
 

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Where can I access latest CBSE Class 11 Biology Biomolecules MCQs Set 02?

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Are Assertion-Reasoning and Case-Study MCQs included in the Biology Class 11 material?

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