dna structure questions
1. what base does adenine pair with in dna?
2. what base does cytosine pair with?
3. what do we call a single monomer of dna?
4. what are the 3 parts of a nucleotide?
i.
ii.
iii.
5. what is the role of the phosphate group and the sugar in dna?
6. if i change 1 base from an a to a g how would that change affect the complementary base strand?
7. what do you notice about the left strand of nucleotides vs the right strand?

Question

dna structure questions
1. what base does adenine pair with in dna?
2. what base does cytosine pair with?
3. what do we call a single monomer of dna?
4. what are the 3 parts of a nucleotide?
   i.
   ii.
   iii.
5. what is the role of the phosphate group and the sugar in dna?
6. if i change 1 base from an a to a g how would that change affect the complementary base strand?
7. what do you notice about the left strand of nucleotides vs the right strand?

Accepted Answer

### Question 1: What base does Adenine pair with in DNA?
# Brief Explanations:
In DNA, according to the base - pairing rules (Watson - Crick base pairing), Adenine (A) forms hydrogen bonds with Thymine (T). This is a fundamental concept in the structure of DNA, where the two strands of the double helix are held together by these specific base - pair interactions.
# Answer:
Thymine (T)

### Question 2: What base does Cytosine pair with?
# Brief Explanations:
Based on the Watson - Crick base - pairing rules in DNA, Cytosine (C) pairs with Guanine (G). These base pairs are crucial for maintaining the structure and function of DNA, including processes like DNA replication and transcription.
# Answer:
Guanine (G)

### Question 3: What do we call a single monomer of DNA?
# Brief Explanations:
The monomer (building block) of DNA is a nucleotide. A nucleotide is composed of three parts: a phosphate group, a deoxyribose sugar (in the case of DNA), and a nitrogen - containing base. Many nucleotides are linked together through phosphodiester bonds to form the DNA polymer.
# Answer:
Nucleotide

### Question 4: What are the 3 parts of a nucleotide?
# Brief Explanations:
A nucleotide, which is the basic unit of DNA (and RNA), consists of three components. The first is a phosphate group ($PO_4^{3 - }$), which is important for the formation of the sugar - phosphate backbone of the nucleic acid. The second is a pentose sugar; in DNA, this is deoxyribose, and in RNA, it is ribose. The third part is a nitrogen - containing base (such as adenine, thymine, cytosine, guanine in DNA or adenine, uracil, cytosine, guanine in RNA).
# Answer:
1. Phosphate group
2. Pentose sugar (deoxyribose in DNA, ribose in RNA)
3. Nitrogen - containing base

### Question 5: What is the role of the phosphate group and the sugar in DNA?
# Brief Explanations:
- **Phosphate group**: The phosphate groups in DNA are part of the sugar - phosphate backbone. They are involved in forming phosphodiester bonds between adjacent nucleotides, which helps in linking the nucleotides together to form the long DNA chain. Also, the negative charge of the phosphate group contributes to the overall negative charge of DNA and plays a role in interactions with other molecules (such as proteins involved in DNA packaging and replication).
- **Sugar (deoxyribose)**: The deoxyribose sugar is also a part of the sugar - phosphate backbone. It provides a stable and rigid structure for the DNA molecule. The carbon atoms of the deoxyribose sugar are involved in the formation of the phosphodiester bonds and also in the attachment of the nitrogen - containing base. The structure of the deoxyribose sugar (missing an oxygen atom at the 2' carbon compared to ribose) contributes to the stability of DNA, making it more suitable as a long - term genetic storage molecule.
# Answer:
- Phosphate group: Forms the sugar - phosphate backbone (via phosphodiester bonds), gives DNA a negative charge, and is involved in nucleotide linkage.
- Sugar (deoxyribose): Part of the sugar - phosphate backbone, provides structural stability, and is involved in base attachment.

### Question 6: If I change 1 base from an A to a G how would that change affect the complementary base strand?
# Brief Explanations:
In the normal base - pairing of DNA, Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C). If a base on one strand changes from A to G, then on the complementary strand, the base that was paired with A (which was T) will now have to pair with G. Since G pairs with C, the complementary base will change from T to C. This change can potentially affect the structure and function of the DNA, for example, if it occurs in a gene, it may lead to a change in the encoded protein (if the change is in a coding region).
# Answer:
The complementary base that was paired with A (Thymine, T) will now pair with G, so it will change from T to Cytosine (C).

### Question 7: What do you notice about the left strand of nucleotides vs the right strand?
# Brief Explanations:
The two strands of DNA (the left and right strands of nucleotides) are complementary and antiparallel. "Antiparallel" means that the direction of the two strands is opposite to each other. One strand runs in the 5' to 3' direction, while the other runs in the 3' to 5' direction. Also, the base sequence of one strand is complementary to the other strand (A pairs with T, G pairs with C). So, for every A on one strand, there is a T on the other; for every G on one strand, there is a C on the other. This complementary and antiparallel nature is essential for DNA replication (where each strand serves as a template for the synthesis of a new complementary strand) and for maintaining the stability of the DNA double helix.
# Answer:
The two strands are complementary (A - T, G - C base pairing) and antiparallel (opposite 5' - 3' orientations).

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QUESTION IMAGE

Question

Explanation:

Question 1: What base does Adenine pair with in DNA?

Answer:

Question 2: What base does Cytosine pair with?