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Biology Chapter 2 : Topic 9
Structure of RNA
1 / 15
Which statement correctly describes the structure of RNA?
Reasoning: RNA consists of a single strand of nucleotides.
2 / 15
The basic building unit of RNA is:
Reasoning: RNA is composed of repeating nucleotide units.
3 / 15
Which component is present in every RNA nucleotide?
Reasoning: Each RNA nucleotide contains ribose sugar, phosphate, and a nitrogenous base.
4 / 15
Which nitrogenous base is present in RNA but absent in DNA?
Reasoning: RNA contains uracil (U) instead of thymine (T).
5 / 15
Which nitrogenous base is NOT found in RNA?
Reasoning: Thymine is found in DNA, while RNA contains uracil.
6 / 15
RNA is called a macromolecule because it:
Reasoning: RNA is a large molecule formed by numerous nucleotides joined together.
7 / 15
Which sugar is present in RNA?
Reasoning: RNA contains ribose sugar, while DNA contains deoxyribose.
8 / 15
Which feature best distinguishes RNA from DNA?
Reasoning: Both DNA and RNA contain nucleotides, phosphates, and bases, but RNA is generally single-stranded.
9 / 15
Which set contains only nitrogenous bases found in RNA?
Reasoning: RNA bases are adenine, uracil, cytosine, and guanine.
10 / 15
In RNA, nitrogenous bases project outward from the sugar-phosphate backbone. These projections are called:
Reasoning: The nitrogenous bases extend from the backbone as base overhangs.
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A scientist finds a nucleic acid containing ribose sugar and uracil. The molecule is most likely:
Reasoning: Ribose and uracil are characteristic components of RNA.
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Which statement correctly compares DNA and RNA?
Reasoning: One of the main differences between DNA and RNA is uracil replacing thymine in RNA.
13 / 15
If an RNA molecule contains adenine, which base may pair with it during protein synthesis?
Reasoning: In RNA base pairing, adenine pairs with uracil.
14 / 15
Which structure forms the backbone of an RNA strand?
Reasoning: The RNA backbone is made of alternating ribose sugars and phosphate groups.
15 / 15
A molecule is single-stranded, contains ribose sugar, and has nitrogenous base overhangs. This molecule is:
Reasoning: These are the defining structural characteristics of RNA.
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