Question

name:
date:
period:
mp2 9 weeks review
dna structure
label all the part of the dna structure and add if it plays a role in structure or traits
function (for structure or traits)
a
b
c
d

Explanation:

To label DNA structure parts:

• A (Nitrogenous Base): E.g., Adenine (A), Thymine (T), Cytosine (C), Guanine (G). Forms base pairs (A - T, C - G) to encode genetic info.
• B (Sugar - Deoxyribose): 5 - carbon sugar, part of nucleotide backbone.
• C (Phosphate Group): Links deoxyribose sugars, forms DNA’s “backbone” with sugar.
• D (Nucleotide): Unit of DNA (base + sugar + phosphate), builds DNA strand.

Functions:

• A: Stores genetic code via base pairing.
• B: Provides structural support, bonds with phosphate and base.
• C: Stabilizes DNA structure, forms covalent bonds in backbone.
• D: Basic building block, carries genetic info in sequence.

Answer:

• A: Nitrogenous Base (e.g., Adenine); Function: Encodes genetic information via base pairing.
• B: Deoxyribose (Sugar); Function: Forms part of the nucleotide backbone, links to phosphate and base.
• C: Phosphate Group; Function: Stabilizes DNA structure, forms covalent bonds in the sugar - phosphate backbone.
• D: Nucleotide; Function: Basic building block of DNA, carries genetic information in its sequence.