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Q. No.
What holds the two strands of a DNA double helix?
1. ionic bonds.
2. hydrogen bonds.
3. nonpolar covalent bonds.
4. hydrophobic exclusions.
Subtopic:  The DNA |
 95%
Level 1: 80%+
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The two strands of polynucleotides in a DNA double helix:
I. are identical.
II. are complementary.
III. are parallel.
IV. are antiparallel.
 
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
Subtopic:  The DNA |
 93%
Level 1: 80%+
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Most hydrated and most stable form of DNA is known as:

1. A DNA 2. B DNA
3. C DNA 4. Z DNA
Subtopic:  The DNA |
 88%
Level 1: 80%+
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Identify the incorrect statement:
1. DNA demonstrates greater stability than RNA due to the absence of 2'-hydroxyl groups.
2. Base pairing through hydrogen bonding maintains the double helical structure of DNA.
3. All nucleic acids exist exclusively in single-stranded configurations without secondary structures.
4. Nucleotides consist of nitrogenous bases, pentose sugars, and phosphate groups.
Subtopic:  The DNA |
 88%
Level 1: 80%+
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Antiparallel strands of a DNA molecule means that

1. The phosphate groups of two DNA strands, at their ends, share the same position
2. The phosphate groups at the start of two DNA strands are in opposite position (pole)
3. One strand turns clockwise
4. One strand turns anti-clockwise 
Subtopic:  The DNA |
 87%
Level 1: 80%+
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Adenosine, Guanosine, thymidine, uridine, cytidine are all ________ but adenylic acid, guanylic acid, uridylic acid, cytidylic acid are ______:

1. Nucleotides, nucleosides              
2. Nucleosides, nucleotides
3. Nucleotides, nucleic acids            
4. Nucleotides, nucleases
Subtopic:  Nucleic Acid | The DNA |
 82%
Level 1: 80%+
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