Multiple Choice
Which type of RNA molecule delivers amino acids to the ribosomes during protein synthesis?
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15. Gene Expression
Introduction to Types of RNA
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Which of the following is found in RNA but not in DNA?
A
Double helix structure
B
Thymine
C
Deoxyribose
D
Uracil
Verified step by step guidance1
Step 1: Understand the structural differences between RNA and DNA. RNA is single-stranded, while DNA is double-stranded and forms a double helix structure.
Step 2: Compare the nitrogenous bases in RNA and DNA. DNA contains adenine (A), thymine (T), cytosine (C), and guanine (G), while RNA contains adenine (A), uracil (U), cytosine (C), and guanine (G). Note that thymine is replaced by uracil in RNA.
Step 3: Examine the sugar molecules in RNA and DNA. DNA contains deoxyribose, while RNA contains ribose. The presence of ribose in RNA makes it structurally different from DNA.
Step 4: Identify the unique component found in RNA but not in DNA. Based on the comparison, uracil is the nitrogenous base present in RNA but absent in DNA.
Step 5: Conclude that uracil is the correct answer to the question, as it is specific to RNA and not found in DNA.
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