Biod 101 portage learning module 4 Exam – 2025 | Complete Verified Q&As

BIOD 101 Module 4 Exam – 2025 |
2026 Portage Learning | Complete
Verified Q&As




Question 1




Compare and contrast purines and pyrimidines and provide examples of each.
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Answer: Purines contain two carbon-
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nitrogen rings and four nitrogen atoms, while the pyrimidines contain one
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carbon-
nitrogen ring and two nitrogen atoms. Adenine and guanine are purines, a
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nd thymine and cytosine are pyrimidines (See section 4.1 in module).
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Question 2




Describe the structure and arrangement of DNA.
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Answer: DNA is a double helix, which means it is composed of two helical st
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rands. The two strands are held together by the ‘rungs’, which are made of
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, complementary pairs. The pairs are held together by weak hydrogen bond
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s.