CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 2 - MCQExams.com

Sulphur is required in plants, as a nutrient element for:
  • making hormones
  • absorption of water
  • making vitamins
  • absorption of fat
Which of the following is the correct statement?
  • Starch is a polymer of $$\alpha$$- glucose.
  • Amylose is not a component of starch.
  • Proteins are composed of only one type of amino acid.
  • In cyclic structure of fructose, there are five carbon and one oxygen atoms.
Which of the following is an acidic amino acid ?
  • Glycine
  • Valine
  • Leucine
  • Glumatic acid
Among the following essential amino acid is:
  • alanine
  • valine
  • proline
  • serine
Vitamin A is present in ?
  • fish liver oil
  • milk
  • butter
  • all of these
Which one of the following bases is not present in DNA?
  • Thymine
  • Quinoline
  • Adenine
  • Cytosine
Vegetable oils like wheat germ oil, sunflower oil, etc. are the good source of ?
  • vitamin K
  • vitamin E
  • vitamin D
  • vitamin A

The elimination of H' will take place at
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  • (a)
  • (b)
  • (c)
  • (d)
Which of the following is not produced by human body?
  • Enzymes
  • Vitamins
  • Proteins
  • Nucleic acid
Incorrect statement about given carbohydrate is
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  • Above compound is a reducing sugar
  • Above compound undergo mutaritation
  • Above compound is a non-reducing sugar
  • Above compound has a glycosidic linkage
Guanine is an example of:
  • a nitrogenous base
  • a nucleoside
  • a nucleotide
  • phosphate
The vitamin having metal atom is ?
  • Vitamin A
  • Vitamin K
  • Vitamin $${ B }_{ 12 }$$
  • Vitamin C
An example of a disaccharide is:
  • Glucose
  • Ribose

  • Cellulose
  • Lactose
Which of the following is a polysaccharide?
  • Cellulose
  • Sucrose
  • Galactose
  • Maltose
A disaccharide which gives only glucose on hydrolysis is :
  • lactose
  • fructose
  • sucrose
  • maltose
Carbohydrates containing more than $$10$$ simple units of sugar are called:
  • Monosaccharides
  • Disaccharides
  • Trisaccharides
  • Polysaccharides
The carbohydrates are classified on the basis of:
  • sugars and non-sugars
  • reducing character
  • optical activity
  • hydrolysis
Which of the following is not a monosaccharide?
  • Glucose
  • Fructose
  • Glyceraldehyde
  • Sucrose
Which carbohydrate is used in silvering of mirrors ?
  • Fructose
  • Glucose
  • Sucrose
  • Starch
Which disaccharide is present in milk?

  • Maltose
  • Galactose
  • Sucrose
  • Lactose
Glucose is a/an:
  • oxidising sugar
  • reducing sugar
  • both reducing and oxidising sugar
  • none of the above
Proteins are polyamides of:
  • $$\beta -$$ amino acids
  • $$\alpha -$$ amino acids
  • $$\alpha -$$ hydroxy acids
  • $$\beta -$$ keto acids
A mixture of  $$\alpha$$-amino acids is obtained when proteins are hydrolysed by:

  • acids
  • bases
  • enzymes
  • all of the above
The acidic amino acid is:
  • Aspartic acid
  • Alycine
  • Serine
  • Tyrosine
The simplest carbohydrate is:
  • dihydroxyacetone
  • formaldehyde
  • glucose
  • sucrose
Which one of the following is $$\alpha$$-amino acid?
  • $$NH_{2}C_{6}H_{5}-CH-CH_{2}-COOH$$
  • $$NH_{2}-CH_{2}-CH_{2}-CH_{2}-CH_{2}-COOH$$
  • $$NH_{2}-CH_{2}-COOH$$
  • $$NH_{2}C_{6}H_{5}-CH-CH_{2}-CH_{2}-COOH$$
Starch is converted into maltose by an enzyme:
  • maltase
  • zymase
  • diastase
  • invertage
In acidic medium, amino acid exists as:
  • $$R-CH(NH_{2})COOH$$
  • $$R-CH(NH_{3})^{+}COOH$$
  • $$R-CH(NH_{2})COO^{-}$$
  • $$R-CH(NH_{3})^{+}COO^{-}$$
Which of the following is a polysaccharide?

  • Maltose
  • Raffinose
  • Glycogen
  • Galactose
Relation between amino acids and proteins is similar to the one present between
  • nucleotides and nucleic acids
  • RNA and DNA
  • glucose and fructose
  • all of the above
Starch is composed of two polysaccharides namely:
  • amylopectin and glycogen
  • amylose and glycogen
  • amylose and amylopectin
  • amylose and amylopectin and glycogen
Which of the following is pyrimidine base ?

  • Adenine
  • Guanine
  • Uracil
  • All the above
Purine derivative among the bases is:
  • thymine
  • uracil
  • guanine
  • cytosine
Nucleic acids are constituents of:


  • haemoglobin
  • nucleoproteins
  • all proteins
  • only lipid proteins
In nucleic acids , the sequence is
  • Phosphate base sugar
  • Sugar phosphate base
  • Phosphate-sugar base
  • Base phosphate sugar
In the nucleic acids, the phosphate ions are bonded with sugar at:
  • 5, 3 locations
  • 5, 2 locations
  • 3, 1 locations
  • 5, 1 locations
Nucleic acids are polymers of:


  • Nucleotides
  • Nucleosides
  • Nuclei of heavy metals
  • Proteins
Each codon consists of how many nitrogen bases?
  • four
  • twenty
  • three
  • sixty four
Guanine is an example of:
  • Nucleotide
  • Nucleoside
  • Purine base
  • Pyrimidine base
Assertion ( A): Thymine pairs with adenine whereas cytosine pairs with Guanine in DNA molecule .
Reason ( R ):The hydrogen bonding between bases of two strands is Highly specific .
  • Both A and R are true and R is the correct explanation of A .
  • Both A and R are true but R is not a correct explanation of A
  • A is true but R is false
  • A is false but R is true
Nucleic acids are
  • small molecules
  • polymeric in nature
  • the compounds of C, H and O
  • essentially proteins
Vitamin B$$_{1}$$ is known as:
  • ascorbic acid
  • carotenoids
  • thiamine
  • pyridoxine
Vitamin D is also known as:
  • growth vitamin
  • sunshine vitamin
  • reproductive vitamin
  • ascorbic acid
Nucleic acids are called acids mainly because of the presence of__________
  • $$-COOH$$ group
  • $$-OH$$ group of sugar unit
  • $$-OH$$ group of the heterocyclic base
  • $$-OH$$ group of phosphate unit
Which of the following is a dicarboxylic acid with one double bond?

  • Ethylene `
  • Traumatic acid
  • Absicic acid
  • Auxins
For artificial ripening of fruit, which of the following is used?

  • Auxin 
  • Cytokinin 
  • Ethylene
  • Gibberellin 
Which of the following vitamins is oil soluble?
  • A
  • B$$_{6}$$
  • B$$_{12}$$
  • B$$_{1}$$
Which of the following vitamins is water soluble?
  • K
  • E
  • D
  • B$$_{1}$$
Which of the following substance acts as stimulator?
  • vitamins
  • enzymes
  • hormones
  • carbohydrates
Receptors of hormones are generally:
  • carbohydrates
  • vitamins
  • lipids
  • protiens
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