Biomolecules MCQs | Biomolecules Objective Type Questions with Answers

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Questions
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

polysaccharide

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

nucleotide

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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