QQuestionBiology
QuestionBiology
What shape is DNA?
A. Straight ladder
B. Double helix (twisted ladder)
C. DNA has no shape
D. Single strand
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Answer
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Step 1:I'll solve this problem step by step:
Step 2:: Understand the Structure of DNA
DNA (Deoxyribonucleic Acid) is a complex molecule with a very specific three-dimensional structure. To determine its shape, we need to consider its molecular arrangement.
Step 3:: Recall the Key Characteristics of DNA
- DNA is composed of two strands - These strands are twisted around each other - The overall shape resembles a twisted ladder or spiral staircase
Step 4:: Analyze the Possible Shapes
Let's evaluate each option: - A. Straight ladder: Incorrect - DNA is not flat or straight - B. Double helix (twisted ladder): Correct - This describes the actual shape of DNA - C. DNA has no shape: Incorrect - DNA has a very specific shape - D. Single strand: Incorrect - DNA is composed of two strands, not one
Step 5:: Scientific Confirmation
The double helix structure was first discovered by James Watson and Francis Crick in 1953, using X-ray crystallography data from Rosalind Franklin. The two strands are held together by hydrogen bonds between complementary base pairs.
Final Answer
Double helix (twisted ladder) The double helix shape is crucial to DNA's function, allowing it to: - Compact genetic information - Facilitate DNA replication - Enable genetic information storage and transmission
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