Biology CLEP Prep Practice Exam

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DNA and RNA differ in:

  1. Number of strands in the molecule

  2. Genetic code

  3. Composition of building blocks

  4. All of the above

The correct answer is: All of the above

DNA and RNA both have a different number of strands in their molecule. DNA has two strands while RNA has only one. Additionally, DNA and RNA also have different genetic codes. The genetic code is essentially the instructions for making proteins and can vary between DNA and RNA. Lastly, DNA and RNA differ in the composition of their building blocks. DNA is composed of deoxyribonucleic acid while RNA is composed of ribonucleic acid. While it may seem that only one of these options is incorrect, the important thing to note is that all three options provided are actually correct in their differences. Therefore, D is the best answer as it encompasses all of the differences between DNA and RNA.

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