36. The most abundant biomolecule on earth
a) proteins
b) lipids
c) nucleic acids
d) Carbohydrates
37. Carbohydrates are
a) polyhydroxy alkynes or aldehydes
b) polyhydroxy phenols or aldehydes
c) polyhydroxy ketones or aldehydes
d) polyhydroxy alkenes and aldehydes
38. Carbohydrates occur naturally in
a) L- form and D-form
b) L- form only
c) D- form only
d) Dependent on the pH
39. Which of the following polysaccharide has α-1-3 linkage
a) cellulose
b) dextran
c) starch
d) glycogen
40. The most important interaction that contribute to polysaccharide folding
a) Ionic bond
b) hydrophobic interaction
c) Vanderwalls interaction
d) hydrogen bond
41. All of the following are extracellular heteropolyscacharides except
a) dextran
b) chondroitin
c) hyaluronate
d) dermatan sulpahte
42. Functions of carbohydrates include
a) cell recognition
b) cell to cell interaction
c) imparting structure and store energy.
d) All of the above
43. 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
44. 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
45. 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
46. 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
47. 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
48. Glycosylation takes place in
a) SER and golgi
b) RER and golgi
c) SER, RER and golgi
d) RER, golgi and mitochondria
49. 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
50. 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
Answers
36. d) carbohydrates
37. c) polyhydroxy ketones or aldehydes
38. c) D- form only
39. b) dextran
40. d) hydrogen bond
41. a) dextran
42. d) All of the above
43. c) Gram negative bacteria
44. c) protection form degradation by liver
45. b) proteins that binds to carbohydrates with high affinity and specificity
46. a) Plasma membrane lectins involved in cell-cell recognition
47. a) more polar region of the carbohydrate residue
48. b) RER and golgi
49. b) OH group of serine or threonine
50. c) proline
Tags:
Biochemistry mcq
Carbohydrates mcq
carbohydrates multiple choice
mcq on carbohydrates
Multiple Choice on Carbohydrates