1. The structural shape of DNA is, of course, the famous double helix. What is a "double helix"? Two Y-shaped strand Two loops, like a figure eight Two spirals, like a twisty ladder Two X-shaped strands

2. DNA is constructed of repeating units. What are these units called? Amino acids Nucleotides Monosaccharides Fatty acids

3. In DNA, to what base does adenine bond? Other adenines Guanine Thymine Cytosine

4. What bases are called purines? Thymine & cytosine Adenine & thymine Adenine & guanine Guanine & cytosine

5. To whom is the discovery of the structure of DNA credited? Gregor Mendel Charles Darwin Watson & Crick Alexander Fleming

6. What part of DNA is found at the centre of the molecule? Amino Acids Sugars Bases Phosphates

7. Weak hydrogen bonds are found between which molecules? Between amino acids Between bases Between sugars and phosphates Between purines

8. What process is used to copy DNA to produce another identical strand? Replication Translation Transcription Photocopying

9. To what molecule is the nitrogen base attached in a nucleotide? Sugar Helix Phosphate Lipid

10. What kind of sugar is found in DNA? Ribose Deoxyribose Galactose Glucose