11 Questions
What type of bond forms between A and T in the double helix?
Hydrogen bond
Which nucleotide combination is held together by three hydrogen bonds in the double helix?
G - C
What is the polarity of the left-hand strand in the double helix?
5'3'
Which statement best describes the structural arrangement of the double helix?
The two strands run in antiparallel directions, with the left-hand strand having 3'5' polarity and the right-hand strand having 5'3' polarity.
What is the significance of the hydrogen bonding between nucleotides in the double helix?
Hydrogen bonding helps to stabilize the double helix structure and ensures specific base pairing between complementary nucleotides.
What determines the polarity of the two strands in a DNA double helix?
The orientation of the sugar-phosphate backbone and the direction of phosphodiester linkages
In bioenergetics, what is the classification of an organism that obtains energy from the sun?
Phototroph
What is the primary energy source for most of Earth’s life forms?
Sunlight
Which type of organisms are classified as autotrophs?
Plants
What is the classification of an organism that obtains energy from chemical compounds?
Chemotroph
Which type of organisms are classified as heterotrophs?
Animals
Study Notes
Double Helix Structure
- A-T bond forms a weak hydrogen bond in the double helix
- A-T bond is held together by two hydrogen bonds
- G-C bond is held together by three hydrogen bonds
Polarity of DNA Strands
- The left-hand strand in the double helix has 5' polarity
- The right-hand strand in the double helix has 3' polarity
- The polarity of the two strands is determined by the 5' and 3' ends
Hydrogen Bonding in DNA
- Hydrogen bonding between nucleotides holds the double helix structure together
- Hydrogen bonding is essential for the stability of the DNA molecule
Energy and Organisms
- An organism that obtains energy from the sun is classified as a phototroph
- Most of Earth's life forms obtain energy from the sun through photosynthesis
- Autotrophs are organisms that produce their own food using light energy
- Heterotrophs are organisms that obtain energy by consuming other organisms
- Chemotrophs are organisms that obtain energy from chemical compounds
Test your knowledge about the formation of a DNA double helix, including the base pairing, hydrogen bonds, and the directionality of the strands.
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