True or false: DNA structure

Exercise and reference answers

Questions

1. Statement is true

   No

   Statement

   The two DNA strands run in the same direction.

2. Statement is true

   Yes

   Statement

   Cytosine and guanine are joined by three hydrogen bonds.

3. Statement is true

   No

   Statement

   The helix diameter changes along its length.

4. Statement is true

   Yes

   Statement

   Griffith worked with Streptococcus pneumoniae.

5. Statement is true

   No

   Statement

   The R strain of pneumococcus causes disease.

6. Statement is true

   Yes

   Statement

   Phosphorus occurs in DNA but not in protein.

Instructions

Tap True or False for each statement.

Explanation