Textbook Question
A particular triplet of bases in the coding sequence of DNA is TGA. The anticodon on the tRNA that binds to the mRNA codon is ________.
a. TGA
b. UGA
c. UCU
d. ACU
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15. Gene Expression
Introduction to Types of RNA
Multiple Choice
Which structural characteristic is seen in RNA but not in DNA?
A
The presence of deoxyribose sugar
B
The presence of a double helix structure
C
The presence of thymine instead of uracil
D
The presence of uracil instead of thymine
Verified step by step guidance1
Understand the basic structural differences between DNA and RNA. DNA is typically double-stranded and forms a double helix, while RNA is usually single-stranded.
Identify the sugar component in the nucleotides of DNA and RNA. DNA contains deoxyribose sugar, whereas RNA contains ribose sugar.
Examine the nitrogenous bases present in DNA and RNA. DNA includes adenine, guanine, cytosine, and thymine, while RNA includes adenine, guanine, cytosine, and uracil.
Recognize that the presence of uracil in RNA is a key structural characteristic that differentiates it from DNA, which contains thymine instead.
Conclude that the presence of uracil instead of thymine is a structural characteristic seen in RNA but not in DNA.
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