Multiple Choice
Which of the following best describes the principle of independent assortment in genetics?
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3. Extensions to Mendelian Inheritance
Understanding Independent Assortment
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Which of the following best describes a structural difference between DNA and RNA?
A
DNA is usually single-stranded, while RNA is usually double-stranded.
B
RNA contains the base cytosine, while DNA does not.
C
DNA contains deoxyribose sugar, while RNA contains ribose sugar.
D
Both DNA and RNA contain the base thymine.
Verified step by step guidance1
Identify the key structural components of DNA and RNA to compare them: sugar type, strand structure, and nitrogenous bases.
Recall that DNA contains deoxyribose sugar, which lacks one oxygen atom compared to ribose sugar found in RNA.
Understand that DNA is typically double-stranded forming a double helix, whereas RNA is usually single-stranded.
Review the nitrogenous bases: DNA contains adenine, thymine, cytosine, and guanine; RNA contains adenine, uracil, cytosine, and guanine (not thymine).
Use these distinctions to evaluate each statement and determine which one correctly describes a structural difference between DNA and RNA.
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