CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 10 - MCQExams.com

Which one of the following statement is correct?
  • All amino acids except lysine are optically active
  • All amino acids are optically active
  • All amino acids except glycine are optically active
  • All amino acids except glutamic acid are optically active.
Which enzyme is responsible for the fermentation of sugar or molasses? 
  • Sucrose
  • Zymase
  • Lactase
  • Selulose
L-alanine and D-alanine 
  • Are present in virtually all products
  • Are superimposable of each other
  • Are enantiomers
  • lack and R group
Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
  • Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperatures $$80^o$$-$$90^o$$C
  • Enzymes are highly specific
  • Most enzymes are proteins but some are lipids
  • Enzymes require optimum pH for maximal activity
Which of the following have carbohydrate as prosthetic group?
  • Glycoprotein
  • Chromoprotein
  • Lipoprotein
  • Nucleoprotein
The most abundant enzyme of the world is related to all, except ______________.
  • Heat sensitivity
  • Photorespiration
  • Have much greater affinity for $$O_2$$ than $$CO_2$$ when $$CO_2:O_2$$ is nearly equal.
  • Have $$Mg^{2+}$$ as its activator.
Which of the following vitamins are water soluble?
  • $$A$$
  • $$E$$
  • $$C$$
  • $$D$$
Fructose is
  • a simple carbohydrate which follows empirical formula
  • a complex carbohydrate which follows empirical formula
  • a simple carbohydrate which does not follow empirical formula
  • a complex carbohydrate which does not follows empirical formula
Which of the following is correct for Lactose
  • It is nonreducing sugar
  • Glycosidic bond $$[1,4]$$ between glucose and galactose
  • Glycosidic bond $$[1,4]$$ between glucose and fructose
  • Glycosidic bond $$[1,2]$$ between glucose and galactose
A carbohydrates consists of:
  • carbon and oxygen
  • carbon, hydrogen and oxygen
  • carbon, hydrogen and nitrogen
  • carbon and hydrogen
Which sugar does not increases the calorific value?
  • Sucrose
  • Glucose
  • Aspartame
  • Fructose
People who take satin drugs to control their blood cholesterol may also take 'coenzyme $$Q_{10}$$'. The diagram shows a simplified structure of one form of this coenzyme.
Which row describes this structure correctly?

the coenzyme isnumber of $$\pi$$ bonds in one molecule
Aan aldehyde$$n+2$$
Ban aldehyde$$n+4$$
Ca ketone$$n+2$$
Da ketone$$n+4$$

1648973_c24e3cbc99c442f2aba22f6ef640db8f.png
  • A
  • B
  • C
  • D
Structure of Guanine is
  • None
What affect does Ph have on enzyme?
  • Change Shape
  • Change Charge Properties
  • Let Undergo Catalysis
  • Both A and B
Rice does not contain: 
  • alanine
  • glycine
  • gluten
  • leucine
Starch  is polymer of
  • fructose
  • Glucose
  • both (a) and (b)
  • none of these
In a chemical test, a biomolecule gives purple ring on treatment with a-naphthol and conc. $$H_{2}SO_{4}$$, The chemical test and biomolecule respectively are: 
  • molisch test, protein
  • molisch test, carbohydrate
  • ninhydrin test, carbohydrate
  • ninhydrin test, protein
Which of the following carbohydrates most abundant in nature
  • Glucose
  • Fructose
  • Starch
  • Cellulose
Which among the following is the monomer of starch? 
  • Glucose
  • Sucrose
  • Fructose
  • Lactose
Sucrose on hydolysis gives
  • glucose only
  • glucose and galactose
  • glucose and fructose
  • glucose and lactose
the disaccharides A,B and C respectively are:
1720661_140d6039e4d342918ae04df5120849cf.JPG
  • lactose, sucrose, maltose
  • sucrose, maltose, lactose
  • sucrose, lactose, maltose
  • maltose, sucrose, lactose
starch undergose hydrolysis is presence of mineral acids to
  • glucose
  • fructose
  • maltose
  • sucrose
Which of the following monosaccharide is pentose? 
  • Glucose
  • Fructose
  • Arabinose
  • mannose
Ascorbic acid is
  • a vitamin
  • an enzyme
  • a protein
  • an amino acid
The human body does not produce
  • vitamins
  • enzymes
  • proteins
  • hormones
Vitamin C is:
  • alcohol
  • amide
  • amine
  • lactone
One of the essential alpha amino acid is:
  • lysine
  • glycine
  • serine
  • proline
The organic compounds of high physiological importance which are essential in small amounts for the well being of all human begins are
  • Proteins
  • Vitamins
  • mineral salts
  • enzymes
Starch is used to test even the small amount of
  • urea in blood
  • iodine in aqueous solution
  • protein in blood
  • glucose in aqueous solution
Which of the following is provitamin A?
  • Ascorbic acid
  • $$\beta -$$ Carotene
  • Calciferol
  • Ergosterol
Vitamin D is also known as:
  • ascorbic acid
  • growth vitamin
  • reproductive vitamin
  • sunshine vitamin
The amino acid which has a non-polar side chain is:
  • lysine
  • serine
  • aspartic acid
  • alanine
The vitamin which is water soluble and antioxidant is:
  • vitamin C
  • vitamin B
  • vitamin E
  • vitamin D
Which of the following is not found in DNA?
  • Uracil
  • Cytosine
  • Adenine
  • Thymine
Carbohydrates are used by body mainly:
  • for obtaining vitamins
  • as a source of energy
  • for building muscles
  • for all its development needs
The examples of nucleotide are:
  • adenylic acid
  • guanylic acid
  • uridylic acid
  • all of these
Starch on hydrolysis by a dilute inorganic mineral acid gives:
  • glucose
  • fructose
  • sucrose
  • maltose
In nucleic acids, the sequence is:
  • base-phosphate-sugar
  • base-sugar-phosphate
  • sugar-base-phosphate
  • phosphate-base-sugar
Nucleic acids are:
  • polymers of nucleosides
  • polymers of nucleotide
  • polymers of purine bases
  • polymers of pyrimidine bases
Which of the following is a disaccharide?
  • Glucose
  • Fructose
  • Sucrose
  • Starch
Which is not a pyrimidine base?
  • Uracil
  • Thymine
  • Cytosine
  • Guanine
A 'base-sugar-phosphate' unit in nucleic acid is called:
  • base phosphate
  • phosphotide
  • nucleotide
  • nucleoside
Vitamin D is:
  • calciferol
  • ergosterol
  • tocoferol
  • pyridoxin
The best source of vitamin A is :
  • beans
  • pulses
  • orange
  • carrot
 Iodine test is shown by: 
  • polypeptide
  • glycogen
  • starch
  • glucose
Charring of sugar is due to:
  • oxidation
  • reduction
  • dehydration
  • reduction and hydration
Starch is converted into maltose in about half an hour's time by:
  • zymase
  • invertase
  • maltase
  • diastase
Which of the following amino acids is optically inactive?
  • Phenyl alanine
  • Glycine
  • Glutamic acid
  • Asparagine
Raffinose on hydrolysis forms:
  • glucose
  • fructose
  • galactose
  • all of these
Which substance chars when heated with conc. $$H_2SO_4$$ ?
  • Carbohydrate
  • Hydrocarbon
  • Fat
  • Protein
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