CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 3 - MCQExams.com

The term vitamin was introduced by
  • Dr. Funk
  • Dr Edwards
  • Dr.Strepto
  • Dr Indira Hinduja
Which of the following is true about vitamins?
  • Vitamins in the humanbody are needed in large amounts.
  • Vitamins are secreted by ductless glands.
  • Vitamins are synthesized by an organisms.
  • Vitamins A,D,E and K are fat soluble whereas vitamins of the B group and vitamin C are water soluble
The vitamin which is water soluble and antioxidant is :
  • vitamin B$$_{6}$$.
  • vitamin B$$_{12}$$.
  • vitamin C.
  • vitamin E.
Which amino acid is achiral?
  • Alanine
  • Valine
  • Proline
  • Glycine

STATEMENT-1: Lysine, cysteine and threonine are highly soluble in water but serine and valine are slightly soluble.

STATEMENT-2: Additional polar groups, such as $$-OH, -NH_{2}$$ and $$COOH$$ increase the solubility in water appreciably.

Select the correct option regarding given statements:
  • STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
  • STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
  • STATEMENT-1 is True, STATEMENT-2 is False
  • STATEMENT-1 is False, STATEMENT-2 is True
Which of the following is not an amino acid?
  • Glycine
  • Alanine
  • Histidine
  • Benzidine
Which of the following enzymes hydrolyse proteins to $$\alpha$$- amino acids?
  • trypsin
  • pepsin
  • chymotrypsin
  • all of the above
N- Glycoside bond connects
  • Sugar , base
  • Sugar , Sugar
  • Base , base
  • Phosphate , ester
The chemical name of vitamin C is:
  • citric acid
  • acetic acid
  • ascorbic acid
  • oxalic acid
Which among the following are purine derivatives among the following bases? 
Adenine   Uracil     Guanine   Thymine
  • 1 & 4
  • 2 & 3 
  • 1 & 3
  • 1, 3 & 4
 Which of the following compound is not a vitamin?
  • niacin
  • riboflavin
  • thiamine
  • guanine
GC / AT ratio in E. coli is
  • 0.93 : 1
  • 1 : 0.93
  • 1 : 1.52
  • 1.52 : 1
6-amino purine is:
  • adenine
  • adenosine
  • cytidine
  • thymidine
Nucleic acids control heredity at:
  • atomic Level
  • ionic level
  • complex level
  • molecular level
Glycoside linkage is an
  • Amide linkage
  • Ether linkage
  • Ester linkage
  • None of these
Which of the following is not a disaccharide?
  • Cane sugar
  • Raffinose
  • Lactose
  • Maltose
Which of the following is least related to the other three?
  • Galactose
  • Glucose
  • Mannose
  • Arabinose
What is the minimum number of carbon atoms to be present in a carbohydrate?
  • 2 
  • 3 
  • 4 
  • 6
Glucose reacts with $$CH_{3}OH$$, in presence of dry $$HCl$$ gas, to form:
  • $$\alpha$$-methyl glucoside
  • $$\beta$$-methyl glucoside
  • both A and B
  • none of these
Which of the following group/linkage is absent in adenine but present in guanine?
  • $$C-N$$
  • $$-NH_{2}$$
  • $$C=O$$
  • $$-CONH_{2}$$
The sequence of bases in the nucleic acid strand is explained by:
  • 1$$^{0}$$ structures
  • 2$$^{0}$$ structures
  • Both 1$$^{0}$$ and 2$$^{0}$$
  • None
Relation between amino acids and proteins is similar to the one between:
  • nucleotides and nucleic acids
  • RNA and DNA
  • Glucose and Fructose
  • Glucose and Mannose
Starch is converted into disaccharide in
presence of
  • Diastase
  • Maltose
  • Zymose
  • Lactose
Starch is used to test even the small amounts of:
  • sucrose in aqueous solution
  • glucose in aqueous solution
  • $$I_{2}$$ in aqueous solution
  • maltose in aqueous solution
In which of following cases, both the compounds are examples of reducing sugars?
  • Glucose and Sucrose
  • Fructose and Maltose
  • Fructose and Sucrose
  • Sucrose and Lactose
Combination of proteins with nucleic acids give
  • enzymes
  • polypeptides
  • nucleo proteins
  • dipeptides
The prosthetic group present in nucleoproteins is
  • nucleic acids
  • lipids
  • carbohydrates
  • phosphoric acid
Select the correct one from the following order of bonds in $$ A, G, T, C$$ and $$U$$.
  • $$A > G > T > C > U $$
  • $$C = G > T = A = U$$
  • $$G = A = T < C = U $$
  • $$A < G < T < C < U$$
Which of the following is/are pyrimidine derivatives?
1.Cytosine  Adenine  Uracil  Thymine
  • 1 and 4 only
  • 2 and 3 only
  • 1 and 3 only
  • 1, 3 and 4 only
Raffinose on hydrolysis forms_________
  • Glucose
  • Fructose
  • Galactose
  • All of these
The commonest disaccharide has the molecular formula______
  • $$C_{10}H_{18}O_{19}$$
  • $$C_{10}H_{20}O_{10}$$
  • $$C_{11}H_{22}O_{11}$$
  • $$C _{12}H_{22}O_{11}$$
Match the following.
List-I List-II   (Monomer)
A) Sucrosei) $$\beta$$-D-Galactose and  $$\beta$$-D-Glucose
B) Cellulose ii) $$\alpha$$-D-Glucose and  $$\beta$$-D-Fructose
C) Starch iii) $$\beta$$-D-Glucose
D) Lactoseiv) $$\alpha$$-D-Glucose
  • A-i; B-ii; C-iii; D-iv
  • A-ii; B-i; C-iii; D-iv
  • A-ii; B-iii; C-iv; D-i
  • A-iv; B-iii; C-i; D-ii
Which of the following is not optically active?
  • Glycine
  • Lysine
  • Aspartic acid
  • Isoleucine
Which of the following amino acids does not correspond to the general formula: $$R - CH(NH_{2}) - COOH$$?
  • Cysteine
  • Proline
  • Argenine
  • Glutamic acid
A sulfur containing amino acid is
  • Glycine
  • Cysteine
  • Alanine
  • Leucine
IUPAC name of glycine is:
  • 2-Aminopropanoic acid
  • 2-Aminobutanoic acid
  • 2-Aminoethanoic acid
  • 2-Aminopent-1,5-dioic acid
The most common reagent for qualitative and quantitative analysis of amino acids is:
  • Ninhydrin reagent
  • Millon's reagent
  • Sangars reagent
  • Edmanns reagent
Starch undergoes hydrolysis in presence of mineral acids to form:
  • glucose
  • fructose
  • maltose
  • sucrose
Which one of the following statements about starch is correct?
  • It occurs in the cell walls of plants
  • It is a disaccharide
  • It is present in roots and seeds of plants
  • It gives a red orange precipitate on boiling with Fehlings solution
Number of $$C=O$$ groups in thymine and X are equal. Now, X is
  • cytosine
  • uracil
  • adenine
  • guanine
On hydrolysis of starch, we finally get:
  • glucose and fructose
  • glucose
  • fructose
  • sucrose
The functional group which is found in amino acid is
  • $$COOH$$
  • $$NH_{3}$$
  • $$CH_{3}$$
  • both A & B
Match the following
Set ASet B
Adeninea. $$C_5N_5H_5O$$
Guanineb. $$C_4N_2H_4O_2$$
Uracilc. $$C_5N_5H_5$$
Thymined. $$C_5N_2H_6O_2$$
  • 1-c; 2- a; 3-d; 4-b
  • 1-c; 2-b; 3-d; 4-e
  • 1-b; 2-c; 3-d; 4-a
  • 1-c; 2- a; 3- b; 4-d
If the amino group of glycine and carboxylic acid group of alanine undergo elimination of water molecule, the name of the compound thus formed is
  • alanylglycide (dipeptide)
  • glycylalanide (tripeptide)
  • glycylalanine (dipeptide)
  • alanylglycine (dipeptide)
The functional groups present in cytosine are:
  • Keto and amino
  • Keto only
  • Amino only
  • methyl
Which of the following statements is not correct?
  • Proteins are poly amides formed from aminoacids
  • Except glycine, all other amino acids show optical activity
  • Natural proteins are made up of L isomers of amino acids
  • In amino acids NH$$_{2}$$and COOH groups are attached to different carbon atoms
The non-proteinaceous substance, which certain enzymes require for their activity are called
  • catalysts
  • inhibitors
  • co-enzymes
  • epimers
The number of tripeptides possible from three different amino acids is:
  • 81
  • 27
  • 9
  • 6
Among Valine, Leucine, Isoleucine, Lysine and Phenyl alanine, odd member is:
  • Leucine, since others are acidic
  • Valine, since others are basic
  • Isoleucine, since others are optically active
  • Leucine, since others are neutral
Assertion:  $$\alpha $$ -amino acids are the building blocks of proteins.
Reason:  Natural amino acids are mostly  $$\alpha $$ -amino acids.
  • Both A and R are true and R is the correct explanation of A
  • Both A and R are true but R is not correct explanation of A
  • A is true but R is false
  • A is false but R is true
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