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Chapter 20: Problem 65

What are the three kinds of molecular subunits in DNA? Which two form the "backbone" of DNA strands?

Short Answer

Expert verified
Answer: The two molecular subunits that form the backbone of DNA strands are phosphate groups and deoxyribose sugar molecules.

Step by step solution

01

Identifying the three molecular subunits in DNA

In DNA, there are three main types of molecular subunits: 1. Deoxyribonucleic acids (or nucleotides) 2. Phosphate groups 3. Sugars (in the case of DNA, it is deoxyribose)
02

Understanding the structure of DNA

DNA is a double helix structure composed of two complementary strands. Each strand consists of a long chain of nucleotides. Every nucleotide is composed of: 1. A nitrogenous base (adenine, thymine, cytosine, or guanine) 2. A sugar molecule (deoxyribose) 3. A phosphate group These three parts are covalently bonded to each other, forming the building blocks of DNA.
03

Identifying the backbone of DNA

The "backbone" of each DNA strand is a continuous chain formed by alternating deoxyribose sugar molecules and phosphate groups. These two components are covalently bonded together, creating a strong and stable structure for the DNA strand. So, the two molecular subunits that form the backbone of DNA strands are: 1. Phosphate groups 2. Deoxyribose sugar molecules

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