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Questions and Answers
The correct structure of DNA components can be presented as:
The correct structure of DNA components can be presented as:
- Base-sugar-phosphate-base
- Phosphate-base-sugar
- Base-phosphate-sugar
- Phosphate-sugar-base (correct)
- Phosphate-sugar-phosphate-base
Which of the following is a characteristic of double-stranded DNA?
Which of the following is a characteristic of double-stranded DNA?
- 2 nanometers in width
- A and B
- 0.34 nanometers per base pair
- 10 base pairs per turn
- A, B and C (correct)
Which of the following DNA molecules is the most stable?
Which of the following DNA molecules is the most stable?
- AGTCGAAT TCAGCTTA
- GCGTGCAC CGCACGTG (correct)
- CTGCATAC GACGTATG
- GGATCCTG CCTAGGAC
- GAAATTTC CTTTAAAG
Doubled-stranded DNA consists of two antiparallel strands, meaning that one strand is oriented in the 5' to 3' direction, while the other is oriented in the 3' to 5' direction.
Doubled-stranded DNA consists of two antiparallel strands, meaning that one strand is oriented in the 5' to 3' direction, while the other is oriented in the 3' to 5' direction.
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Asymmetrical spacing of the backbones of the DNA double helix generates major and minor grooves.
Asymmetrical spacing of the backbones of the DNA double helix generates major and minor grooves.
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Study Notes
DNA Structure Fundamentals
- DNA components are structured in the order phosphate-sugar-base, which is critical for its formation and function.
- The correct sequencing of components impacts the overall properties and stability of DNA.
Characteristics of Double-Stranded DNA
- Double-stranded DNA has a consistent width of 2 nanometers.
- The helix structure features 10 base pairs per turn, contributing to its stability.
- Each base pair measures 0.34 nanometers, which is essential for the consistent structure of the helix.
Stability of DNA Molecules
- Among the provided DNA molecules, the GCGTGCAC/CACGTGC sequence is the most stable due to its composition and pairing.
- Stability can depend on base pair interactions, influencing DNA's structural integrity.
Antiparallel Strands
- DNA consists of two antiparallel strands; one runs in the 5' to 3' direction while the other runs in the 3' to 5' direction, essential for replication and transcription processes.
Groove Formation in DNA
- The asymmetrical arrangement of the DNA double helix backbones gives rise to major and minor grooves, which play crucial roles in protein binding and interactions with other molecules.
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