Podcast
Questions and Answers
What type of bond forms between A and T in the double helix?
What type of bond forms between A and T in the double helix?
- Ionic bond
- Hydrogen bond (correct)
- Van der Waals bond
- Covalent bond
Which nucleotide combination is held together by three hydrogen bonds in the double helix?
Which nucleotide combination is held together by three hydrogen bonds in the double helix?
- T - C
- G - C (correct)
- A - G
- A - T
What is the polarity of the left-hand strand in the double helix?
What is the polarity of the left-hand strand in the double helix?
- 5'5'
- 3'3'
- 3'5'
- 5'3' (correct)
Which statement best describes the structural arrangement of the double helix?
Which statement best describes the structural arrangement of the double helix?
What is the significance of the hydrogen bonding between nucleotides in the double helix?
What is the significance of the hydrogen bonding between nucleotides in the double helix?
What determines the polarity of the two strands in a DNA double helix?
What determines the polarity of the two strands in a DNA double helix?
In bioenergetics, what is the classification of an organism that obtains energy from the sun?
In bioenergetics, what is the classification of an organism that obtains energy from the sun?
What is the primary energy source for most of Earth’s life forms?
What is the primary energy source for most of Earth’s life forms?
Which type of organisms are classified as autotrophs?
Which type of organisms are classified as autotrophs?
What is the classification of an organism that obtains energy from chemical compounds?
What is the classification of an organism that obtains energy from chemical compounds?
Which type of organisms are classified as heterotrophs?
Which type of organisms are classified as heterotrophs?
Flashcards
Hydrogen bond in DNA
Hydrogen bond in DNA
A weak chemical bond that forms between complementary nitrogenous bases (A-T or C-G) in DNA, holding the two strands together.
A-T pairing
A-T pairing
The specific pairing of adenine (A) with thymine (T) in DNA, held together by two hydrogen bonds.
G-C pairing
G-C pairing
The specific pairing of guanine (G) with cytosine (C) in DNA, held together by three hydrogen bonds.
DNA strand polarity
DNA strand polarity
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Antiparallel DNA strands
Antiparallel DNA strands
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DNA double helix
DNA double helix
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Phototroph
Phototroph
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Photosynthesis
Photosynthesis
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Chemotroph
Chemotroph
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Autotroph
Autotroph
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Heterotroph
Heterotroph
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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
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Description
Test your knowledge about the formation of a DNA double helix, including the base pairing, hydrogen bonds, and the directionality of the strands.
