Questions and answers for exam Preparation

MCQs

Total Questions : 301 | Page 7 of 31 pages

Question 61. Who deduced the double-helical structure of DNA?

Frederick Sanger
Mendel
Watson and Francis Crick
Anton van Leeuwenhoek

Discuss Question

Answer: Option C. -> Watson and Francis Crick
Answer: (c).Watson and Francis Crick

Question 62. Two chains of amino acids in an insulin molecule are held together by __________

Sulfide bridges
Disulfide bridges
Peptide bond
Covalent linkage

Discuss Question

Answer: Option B. -> Disulfide bridges
Answer: (b).Disulfide bridges

Question 63. Which of the following is false?

The two main types of secondary structure are the α helix and β pleet structures
α helix is a right handed coiled strand
The hydrogen bonding in a β-sheet is between strands rather than within strands
The hydrogen bonding in a β-sheet is within strands rather than between strands

Discuss Question

Answer: Option D. -> The hydrogen bonding in a β-sheet is within strands rather than between strands
Answer: (d).The hydrogen bonding in a β-sheet is within strands rather than between strands

Question 64. Hemoglobin is a __________

Monomer
Dimer
Trimer
Tetramer

Discuss Question

Answer: Option D. -> Tetramer
Answer: (d).Tetramer

Question 65. Tertiary conformation of proteins is maintained by 3 types of bonds namely ionic, hydrogen and __________

Sulfide
Disulfide
Covalent
Peptide

Discuss Question

Answer: Option B. -> Disulfide
Answer: (b).Disulfide

Question 66. Which of the following is the correct order of sequencing?

Cleaving, sequencing and ordering
Sequencing, ordering and cleaving
Ordering, cleaving and sequencing
Ordering, sequencing and cleaving

Discuss Question

Answer: Option A. -> Cleaving, sequencing and ordering
Answer: (a).Cleaving, sequencing and ordering

Question 67. What best summarizes the MALDI method by which gas phase ions are produced for mass spectrometry?

Sample is hit by a low energy xenon beam
Sample is forced through a narrow capillary tube and the solvent rapidly evaporates
Sample is embedded in a crystalline matrix and bombarded by laser beams
Sample is heated and then bombarded by electrons

Discuss Question

Answer: Option C. -> Sample is embedded in a crystalline matrix and bombarded by laser beams
Answer: (c).Sample is embedded in a crystalline matrix and bombarded by laser beams

Question 68. Which of the following is Edman reagent?