The Structure of DNA

1. What does DNA stand for?

• Deoxynitrogenous Acid
• Deribo Nuclein Acid
• Deoxyribonucleic Acid
• Denatured Nucleic Acid

2. What shape is a DNA molecule?

• Triple Helix
• Single Helix
• Double Helix
• Quadruple Helix

3. There are four nitrogenous bases found in DNA. Three are cytosine, adenine and guanine. What is the fourth?

• Thymine
• Trimine
• Adenosyne
• Ribose

4. The bases form complimentary base pairs. Which pairs shown are correct?

• A - T and C - G
• A - C and T - G
• A - G and C - T

6. What is the name of the repeating units (monomers) that make up DNA?

• Nucleus
• Nucleotides
• Amino Acids
• Monosaccharides

7. Which type of bonds form between complementary base pairs?

• Oxygen
• Hydrogen
• Phosphodiester
• Covalent

8. In a double stranded DNA molecule, the percentage of cytosine is 18. What would be the percentage of thymine?

• 32%
• 16%
• 64%
• 18%

9. If a double stranded DNA has 20% of guanine, what will be the percentage of adenine in it?

• 30%
• 60%
• 15%
• 20%

10. A DNA strand has the following bases: A A G C C A. What are the bases on its complimentary strand?

• A A G C C A
• A C C G A A
• T T C G G T
• C C A T T C

11. Based on the image of the DNA molecule, what would letter Y be?

• Thymine
• Cytosine
• Adenine
• Deoxyribose