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Biomolecules MCQs | Biomolecules Objective Type Questions with Answers

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Free download in PDF Biomolecules Objective Type Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) PDI is an enzyme involve in
[A] Protein synthesis
[B] Protein degradation
[C] Protein folding
[D] Protein quaternery structure formation
Answer: Protein folding
(2) The most abundant biomolecule on earth
[A] proteins
[B] lipids
[C] nucleic acids
[D] carbohydrates
Answer: carbohydrates
(3) Carbohydrates are
[A] polyhydroxy alkynes or aldehydes
[B] polyhydroxy phenols or aldehydes
[C] polyhydroxy ketones or aldehydes
[D] polyhydroxy alkenes and aldehydes
Answer: polyhydroxy ketones or aldehydes
(4) Carbohydrates occur naturally in
[A] L- form and D-form
[B] L- form only
[C] D- form only
[D] Dependent on the pH
Answer: D- form only
(5) Which of the following polysaccharide has α-1-3 linkage

[A] cellulose
[B] dextran
[C] starch
[D] glycogen
Answer: dextran
(6) The most important interaction that contribute to polysaccharide folding
[A] Ionic bond
[B] hydrophobic interaction
[C] Vanderwalls interaction
[D] hydrogen bond
Answer: hydrogen bond
(7) All of the following are extracellular heteropolyscacharides except
[A] dextran
[B] chondroitin
[C] hyaluronate
[D] dermatan sulpahte
Answer: dextran
(8) Functions of carbohydrates include
[A] cell recognition
[B] cell to cell interaction
[C] imparting structure and store energy
[D] All of the above
Answer: All of the above
(9) Lipopolysaccharide in the outer membrane is responsible for the antigenic property in
[A] Gram positive bacteria
[B] Gram positive and gram negative bacteria
[C] Gram negative bacteria
[D] Actinomycetes
Answer: Gram negative bacteria
(10) Many plasma glycoproteins has a terminal sialic acid residue that helps in
[A] cell to cell recognition
[B] cells interaction with extracellular matrix
[C] protection form degradation by liver
[D] generating signals that favours degradation by liver
Answer: protection form degradation by liver
(11) Lectins are
[A] Carbohydrate degrading proteins
[B] proteins that binds to carbohydrates with high affinity and specificity
[C] are glycoproteins that binds to carbohydrates
[D] are glycoproteins present in bacteria
Answer: proteins that binds to carbohydrates with high affinity and specificity
(12) Selectins are
[A] Plasma membrane lectins involved in cell-cell recognition
[B] cytosolic lectins involved in intracellular signalling
[C] Plasma membrane glycoproteins involved in cell to cell interaction
[D] Plasma membrane glycoproteins that functions as second messengers
Answer: Plasma membrane lectins involved in cell-cell recognition
(13) Lectins binds preferentially to
[A] more polar region of the carbohydrate residue
[B] less polar region of the carbohydrate residue
[C] both polar and non-polar region of the carbohydrate residue
[D] All of the above
Answer: more polar region of the carbohydrate residue
(14) Glycosylation takes place in
[A] SER and golgi
[B] RER and golgi
[C] SER, RER and golgi
[D] RER, golgi and mitochondria
Answer: RER and golgi
(15) O- linked oligosaccharides are attached to the protein via
[A] OH group of serine or tyrosine
[B] OH group of serine or threonine
[C] OH group of tyrosine or threonine
[D] OH group of threonine only
Answer: OH group of serine or threonine
(16) N-linked oligosaccharides are linked to protein via NH2 groups of Asparagine. The sequence containing asparagine is usually asp-X-ser/thr. X can be any amino acid except
[A] glycine
[B] histidine
[C] proline
[D] serine
Answer: proline
(17) The pentoses in nucleotides are
[A] in β-furanose form
[B] in α-furanose form
[C] Both
[D] none of the above
Answer: in β-furanose form
(18) To identify self DNA from non-self DNA, the self DNA may be
[A] glycosylated
[B] carboxylated
[C] phosphorylated
[D] methylated
Answer: methylated
(19) Functions of nucleotide includes

[A] information storage and transmission
[B] storage of chemical energy
[C] cell signalling
[D] All of the above
Answer: All of the above
(20) Choose the best option
[A] proteins has catalytic activity
[B] Proteins and RNA have catalytic activity
[C] Proteins, RNA and antibodies have catalytic activity
[D] Proteins, RNA, antibodies and phospholipids have catalytic activity
Answer: Proteins, RNA and antibodies have catalytic activity

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