1. How many base pairs are in a full turn or twist of a DNA molecule?
2. Name the complementary base pairs on DNA.
A-T; G-C are the pairs, you name them.
there are 10 1/2 base pairs for a full twist in DNA
How does the nucleotide sequence in one chain of DNA compare with the other chain of DNA?
How many base pairs are in a full turn or twist of a DNA molecule?
Hello
10 1/2
12. The model of DNA is known as a ____________________________ because it is composed of two ___________________ chains wrapped around each other.
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the model of dna is known as a_________because it is composed of two_____________chains wrapped around each other
1. To determine the number of base pairs in a full turn or twist of a DNA molecule, we need to know the pitch of the DNA helix. The pitch is the distance traveled along the helix axis for a complete 360-degree turn. In the B-DNA form, the most common and well-known conformation, the pitch is approximately 34 angstroms (or 3.4 nanometers).
To calculate the number of base pairs in a full turn or twist, we divide the pitch by the height of a single base pair, which is roughly 3.4 angstroms. Therefore, 34 angstroms (pitch) divided by 3.4 angstroms (height of a base pair) equals 10 base pairs.
So, there are approximately 10 base pairs in a full turn or twist of a DNA molecule.
2. The complementary base pairs in DNA are:
- Adenine (A) pairs with Thymine (T)
- Guanine (G) pairs with Cytosine (C)
These base pairs form the building blocks of the DNA double helix structure. The A-T and G-C base pairs undergo hydrogen bonding between their nitrogenous bases, ensuring the stability and complementary nature of DNA strands.
The nucleotide sequence in one chain of DNA is complementary to the sequence in the other chain. This means that for every A on one chain, there will be a T on the other, and for every G on one chain, there will be a C on the other.
12. The model of DNA is known as a double helix because it is composed of two intertwined chains, called DNA strands or DNA chains, wrapped around each other. The term "double" signifies the presence of two strands, and "helix" refers to the spiral structure formed by these strands. The double helix structure of DNA was proposed by James Watson and Francis Crick in 1953.