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Questions and Answers
Which base pairs bond together in the DNA double helix?
Which base pairs bond together in the DNA double helix?
What is the role of hydrogen bonds in the DNA double helix?
What is the role of hydrogen bonds in the DNA double helix?
How many hydrogen bonds occur between guanine and cytosine pairs in DNA?
How many hydrogen bonds occur between guanine and cytosine pairs in DNA?
Which of the following statements about the DNA double helix is true?
Which of the following statements about the DNA double helix is true?
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Which structural feature is NOT characteristic of the DNA double helix?
Which structural feature is NOT characteristic of the DNA double helix?
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Which of the following correctly describes the base pairing in DNA?
Which of the following correctly describes the base pairing in DNA?
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What is the characteristic structure of DNA?
What is the characteristic structure of DNA?
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How do the two strands of DNA relate in terms of directionality?
How do the two strands of DNA relate in terms of directionality?
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What type of bond connects the bases of opposite DNA strands?
What type of bond connects the bases of opposite DNA strands?
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Which of the following pairs correctly matches the base pairing rules in DNA?
Which of the following pairs correctly matches the base pairing rules in DNA?
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Study Notes
DNA Double Helix Structure
- The DNA double helix consists of two DNA strands twisted together around a common axis.
- The two strands are antiparallel, meaning they run in opposite directions (5′ to 3′ and 3′ to 5′).
- The strands are held together by hydrogen bonds between complementary base pairs: adenine (A) with thymine (T) and guanine (G) with cytosine (C).
- Three hydrogen bonds occur between G and C, while two occur between A and T.
- The AT/GC rule enables the prediction of one DNA strand's sequence if the opposing strand's sequence is known.
- The width of the double helix is relatively constant due to the pairing of purines (A and G) with pyrimidines (T and C).
- DNA with a higher G-C content forms more stable double-stranded structures.
- A complete turn of the helix spans ten base pairs, covering a linear distance of 3.4 nm.
- Each base pair occupies 0.34 nm along the DNA strand.
B DNA and Z DNA
- B DNA is the most common form of DNA, featuring a right-handed helix.
- Z DNA is a less common form of DNA with a left-handed helix.
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Description
Test your knowledge on the DNA double helix structure, including its antiparallel strands and base pairing rules. This quiz covers key concepts such as the stability differences between B DNA and Z DNA, along with the significance of GC content. Evaluate your understanding of one of the fundamental structures of molecular biology.
