Daily Practice Problems
Class 12 Chemistry
Biomolecules
Class 12 Chemistry
Biomolecules
Question1.
Structure of disaccharide is formed by glucose and fructose is given below. Identify anomeric carbon atoms in monosaccharide units.
(a) ‘a’ carbon of glucose and ‘a’ carbon of fructose
(b) ‘a’ carbon of glucose and ‘e’ carbon of fructose
(c) ‘a’ carbon of glucose and ‘b’ carbon of fructose
(d)‘f’ carbon of glucose and ‘f’ carbon of fructose
Question2.
Name of the cyclic ring present in fructose.
(a)Pyridine
(b) Pyrole
(c) Furan
(d) Indole
Question3.
What do you understand by anomeric carbon? Explain by giving one example.
Question4.
Name two aldose sugars present in nucleic acid.
Question5.
All amino acid are optically active except –
(a) valine
(b) arginine
(c) glycine
(d) isoleucine
Question6.
Carbohydrate have a general formula of Cx(H2O)y
Both Acetic acid and Rhamnose are belongs to carbohydrate category.
(a) Acetic acid is carbohydrate and Rhamnose is not
(b) Both are carbohydrate
(c) Rhamnose is a carbohydate and Acetic acid is not
(d) Both are not Carbohydrate
Question7.
Lactose is a milk sugar in which glucose and galactose is linked with –
(a) C-1 of Glucose and C-4 of galactose
(b) C-1 of galactose and C-4 of glucose
(c) C-3 fructose and C-2 of Glucose
(d) C-1 of Glucose and C-4 of glucose
Question8.
Protein can be classified into two types in the basis of their molecular shape, i.e. fibrous and globular protein. Example of globular protein –
(a) myosin
(b) insulin
(c) cellulose
(d) amylopectin
Question9.
What do you understand by isoelectric PH?
Question10.
Give name of two conformation test for aldehydic group of Glucose with one reaction?
Question11.
Which of the following reaction of glucose can be explained only by its cyclic structure?
(a) Glucose form 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 form gluconic acid.
Question12.
Which of the following is a purine base?
(a) Guanine
(b) Thymine
(c) Thyroxine
(d) Uracil
Question13.
In fibrous protein, polypeptide chains are held together by:
(a) van der waal’s forces
(b) disulphide linkage
(c) electrostatic Forces of attraction
(d) hydrogen bonds
Question14.
Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage.
etween which carbon atoms of pentose sugar of nucleotide are these linkage present
(a) 5’ and 3’
(b) 1’ and 5’
(c) 5’ and 5
(d) 3’ and 3’
Assertion and reasons
(a) If (A) and (R) are correct statement and (R) is the correct explanation of the (A).
(b) If both (A) and (R) are not correct.
(c) If (A) is incorrect statement but (R) is correct statement
(d) If (A) is correct statement but (R) is incorrect statement
(e) If both (A) and (R) are correct statement but (R) is not the correct explanations of
(A)
Question15.
A. Vitamin D can be stored in our body.
B. Vitamin D is fat soluble vitamin.
Question16.
The major groves and minor groves in DNA is –
(a) 22 Å and 12 Å wider Respectively
(b) 12 Å and 22 Å wider Respectively
(c) 30 Å and 5 Å wider Respectively
(d) 15 Å and 15 Å wider Respectively
Question17.
The 3-D model of DNA is given by –
(a) Watson and Crick
(b) Friedrich Miescher
(c) Leslie Orgel
(d) Gerardus Johannes Mulder
Question18.
Vitamin containing cobalt metal is
(a) Vitamin D
(b) Vitamin B6
(c) Vitamin B12
(d) Vitamin C
Question19.
What do you understand by first and second class protein?
Question20.
Match the following enzymes with the reaction they catalyse.
(a) Invertase – Decomposition of urea into NH3 and CO2
(b) Maltase – Conversion of glucose into ethyl alcohol
(c) Pepsin – Hydrolysis of maltose into glucose
(d) Urease – Hydrolysis of cane sugar
(e) Zymase – Hydrolysis of protein into peptides.
- - Reduction of malic acid
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