a. What three basic components make up a nucleotide of DNA?

Verified step by step guidance

1. Understand that a nucleotide is the basic building block of DNA, and each nucleotide consists of three fundamental components.
2. Identify the first component: a nitrogenous base, which can be one of four types in DNA—adenine (A), thymine (T), cytosine (C), or guanine (G).
3. Identify the second component: a five-carbon sugar called deoxyribose, which forms the backbone of the DNA strand.
4. Identify the third component: a phosphate group, which links the sugar of one nucleotide to the sugar of the next nucleotide, creating the sugar-phosphate backbone.
5. Summarize that these three components—nitrogenous base, deoxyribose sugar, and phosphate group—together form a nucleotide in DNA.

Key Concepts

Nucleotide Structure

A nucleotide is the basic building block of DNA, composed of three main parts: a nitrogenous base, a five-carbon sugar, and a phosphate group. These components combine to form the repeating units of the DNA strand.

Nitrogenous Bases

Nitrogenous bases are molecules that contain nitrogen and act as the information carriers in DNA. The four types in DNA are adenine, thymine, cytosine, and guanine, which pair specifically to encode genetic information.

Deoxyribose Sugar

Deoxyribose is the five-carbon sugar in DNA nucleotides that connects the nitrogenous base to the phosphate group. It differs from ribose by lacking one oxygen atom, which is crucial for the stability and structure of DNA.