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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-phosphate-sugar
- phosphate-sugar-phosphate-base
- phosphate-sugar-base (correct)
- phosphate-base-sugar
- base-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?
- 0.34 nanometers per base pair
- A, B and C (correct)
- 10 base pairs per turn
- 2 nanometers in width
- A and B
Which of the following DNA molecules is the most stable?
Which of the following DNA molecules is the most stable?
- CTGCATAC GACGTATG
- GCGTGCAC CGCACGTG (correct)
- GAAATTTC CTTTAAAG
- AGTCGAAT TCAGCTTA
- GGATCCTG CCTAGGAC
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 organized in the order: phosphate-sugar-base, making option B the correct structure format.
- Double-stranded DNA exhibits several characteristics, including a width of 2 nanometers, 10 base pairs per turn, and a distance of 0.34 nanometers per base pair; all are included in option E.
Stability of DNA Molecules
- The most stable DNA molecule listed is GCGTGCAC paired with CGCACGTG, making option D the correct choice.
Antiparallel Orientation
- Double-stranded DNA features two antiparallel strands; one strand runs from 5' to 3', while the complementary strand runs from 3' to 5'. This statement is true.
Grooves in the Double Helix
- The asymmetrical spacing of the sugar-phosphate backbones in the DNA double helix creates major and minor grooves. This statement is also true.
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