JEE Questions for Chemistry Biomolecules Quiz 7 - MCQExams.com

In both DNA and RNA, heterocylic base and phosphate ester linkages are at
  • C'5 and C'1 respectively of the sugar molecule
  • C'1 and C'5 respectively of the sugar molecule
  • C'2 and C'5 respectively of the sugar molecule
  • C'5 and C'2 respectively of the sugar molecule
How many hydrogen bonds are present between pair of thymine and adenine in DNA ?
  • 1-hydrogen bond
  • 2-hydrogen bonds
  • 3-hydrogen bonds
  • No bonds occur
RNA contains
  • ribose sugar and thymine
  • ribose sugar and uracil
  • deoxyribose sugar and uracil
  • deoxyribose sugar and thymine
Lipids are
  • nucleic acids occurring in plants
  • proteins occurring in animals
  • carbohydrates occurring in plants
  • fats of natural origin
Which one of the following statements is true?
  • Saponification of oil yields a diol
  • Drying of oil involves hydrolysis
  • Addition of antioxidant to oil minimises rancidity
  • Refining of oil involves hydrogenation
Match the following Columns.
Chemistry-Biomolecules-1041.png
  • A = 1, B = 2, C = 3, D = 4
  • A = 2, B = 3, C = 4, D = 1
  • A = 3, B = 4, C = 1, D = 2
  • A = 3, B = 4, C = 2, D = 1
Match the following Columns.
Chemistry-Biomolecules-1042.png
  • A = 3, B = 4, C = 5, D = 2, E = 1
  • A = 3, B = 4, C = 5, D = 1, E = 2
  • A = 4, B = 5, C = 1, D = 3, E = 2
  • A = 3, B = 5, C = 4, D = 2, E = 2
  • A = 4, B = 5, C = 3, D = 1, E = 2
Which lipid is not obtained by the hydrolysis of simple lipid and compound lipid from the following ?
  • Cholesterols
  • Neutral fats
  • Carotenoids
  • Terpenes
Waxes are esters of
  • glycerol
  • long chain alcohols
  • glycerol and fatty acid
  • long chain alcohols and long chain fatty acids
Which one of the following is a non-steroidal hormone?
  • Estradiol
  • Prostaglandin
  • Progesterone
  • Estrone
  • Testosterone
A distinctive and characteristic functional group of fats is
  • a peptide group
  • an ester group
  • an alcoholic group
  • a ketonic group
Phospholipids are esters of glycerol with
  • one carboxylic acid residue and two phosphate groups
  • three phosphate groups
  • three carboxylic acid residues
  • two carboxylic acid residues and one phosphate groups
Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories ?
  • a coenzyme
  • a hormone
  • an enzyme
  • an antibiotic
Cellulose upon acetylation with excess acetic anhydride/ H2SO4 (catalytic) gives cellulose triacetate whose structure is

  • Chemistry-Biomolecules-1043.png
  • 2)
    Chemistry-Biomolecules-1044.png

  • Chemistry-Biomolecules-1045.png

  • Chemistry-Biomolecules-1046.png
1.78 g of an optically active L-amino acid (A) is treated with NaNO2 /HCl at 0° C , 448 cm3 of nitrogen was at STP is evolved. A sample of protein has 0.25% of this amino acid by mass. The molar mass of the protein is
  • 36500 g mol-1
  • 34500 g mol-1
  • 35400 g mol-1
  • 35600 g mol-1
A tetrapeptide has —COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with —NH2 group attached to a chiral centre is
  • 7
  • 5
  • 4
  • 8
The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0?
Chemistry-Biomolecules-1048.png
  • 2
  • 4
  • 6
  • 8
Match the following Columns.
Chemistry-Biomolecules-1049.png
  • A = 4, B = 3, C = 1, D = 5, E = 2
  • A = 5, B = 3, C = 4, D = 1, E = 2
  • A = 3, B = 2, C = 1, D = 5, E = 4
  • A = 2, B = 4, C = 1, D = 3, E = 5
  • A = 1, B = 5, C = 4, D = 2, E = 3
Which of the following is not correct
  • Chlorophyll is responsible for the synthesis of carbohydrates in plants
  • The compound formed in the addition of oxygen to haemoglobin is called oxyhaemoglobin
  • Acetyl salicylic acid is known as aspirin
  • The metal ion present in vitamin B12 is Mg 2+
An electric current is passed through an aqueous solution of a mixture of alanine (isoelectric point 6.glutamic acid (3.and arginine (10.buffered at pH 6. What is the fate of the three acids?
  • Glutamic acid migrates to anode at pH 6. Arginine present as a cation and migrates to the cathode Alanine in a dipolar ion remains uniformly distributed in solution
  • Glutamic acid migrates to cathode and others remain uniformly distributed in solution
  • All three remain uniformly distributed in solution
  • All three move to cathode
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Chemistry Quiz Questions and Answers