Question

1. use the structure of the dna and identify the following
2. identify in the structure of the dna the following:

• both purines:
• both pyrimidines:
• hydrogen bonds:
• phosphodiester bond:
• the adenine base is a complementary base for
• cytosine is a complementary base for
• adenine forms (2 or 3) hydrogen bonds with
• guanine forms (2 or 3) hydrogen bonds with

1. the backbone of the dna is formed by and
2. the shape of the dna is a
3. purines have ring(s) in their structure and pyrimidines have ring(s) in their structure.

beside each carbohydrate molecule, write whether it is monosaccharide, disaccharide, or polysaccharide.if you can write the name of the carbohydrate. circle the glycosidic bond

Explanation:

In DNA, purines are double - ringed structures (A and G) and pyrimidines are single - ringed (T and C). Complementary base pairing occurs with A - T having 2 hydrogen bonds and G - C having 3 hydrogen bonds. The DNA backbone consists of alternating sugar and phosphate. Its shape is a double - helix. Carbohydrates are classified as monosaccharides (single sugar units), disaccharides (two sugar units joined) and polysaccharides (multiple sugar units joined).

Answer:

1.

• Both purines: Adenine (A), Guanine (G)
• Both pyrimidines: Thymine (T), Cytosine (C)
• Hydrogen bonds: Bonds between complementary bases
• Phosphodiester bond: Bond between nucleotides in DNA strand
• The adenine base is a complementary base for Thymine (T)
• Cytosine is a complementary base for Guanine (G)
• Adenine forms 2 hydrogen bonds with Thymine (T)
• Guanine forms 3 hydrogen bonds with Cytosine (C)

1. The backbone of the DNA is formed by deoxyribose sugar and phosphate groups.
2. The shape of the DNA is a double - helix.
3. Purines have 2 rings in their structure and pyrimidines have 1 ring in their structure.

For carbohydrates:

• First structure (single hexose ring): Monosaccharide, Glucose
• Second structure (two hexose rings joined): Disaccharide, Sucrose (glucose - fructose)
• Third structure (multiple hexose rings): Polysaccharide