3.4 Mastery Check

What are the three parts of a nucleotide?

• 5 carbon sugar
• A purine
• A nitrogen base
• A phosphate group
• An oxygen group

Which of the following is NOT a nitrogen base?

• Adenine
• Guanine
• Celinine
• Thymine
• Cytosine

Adenine and guanine are examples of ___________.

• Purines
• Pyrimidines

If there is 15% adenine in a DNA strand, what percent of thymine is there?

• 10%
• 15%
• 20%
• 25%

Which is the correct complementary base pair?

• adenine and cytosine
• guanine and thymine
• adenine and thymine
• guanine and adenine