rna, like dna, is a nucleic acid made of a long chain of nucleotides. but there are three important differences between rna and dna: • the 5-carbon sugar in rna is ribose instead of deoxyribose. • rna has a nitrogenous base called uracil instead of thymine. • rna is usually single-stranded, not double-stranded. select all the nucleotides that can be found in rna, but not dna.

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# Brief Explanations:
1. Recall the differences between RNA and DNA: RNA has ribose (sugar), uracil (nitrogenous base), and is single - stranded. DNA has deoxyribose, thymine, and is double - stranded.
2. Analyze each nucleotide:
   - The first nucleotide (top - left) has deoxyribose (sugar) and guanine (base). DNA has deoxyribose and guanine, so this is not unique to RNA.
   - The second nucleotide (top - right) has ribose (sugar) and cytosine (base). But cytosine is present in both DNA and RNA, and the sugar here is ribose, but the base is not unique. However, the sugar ribose is part of RNA's structure. But we need nucleotides unique to RNA (not in DNA).
   - The third nucleotide (bottom - left) has deoxyribose (sugar) and adenine (base). DNA has deoxyribose and adenine, so not unique to RNA.
   - The fourth nucleotide (bottom - right) has ribose (sugar) and uracil (base). Uracil is only in RNA, and ribose is the sugar of RNA. So this nucleotide (with ribose and uracil) is unique to RNA. Also, the second nucleotide (top - right) has ribose as sugar (RNA's sugar) and cytosine, but cytosine is in DNA too. Wait, no: the key is nucleotides in RNA but not DNA. A nucleotide is composed of sugar, phosphate, and nitrogenous base. So for a nucleotide to be in RNA but not DNA, it should have either ribose (instead of deoxyribose) and/or uracil (instead of thymine), and the combination should not be in DNA.
   - DNA nucleotides have deoxyribose, phosphate, and A/T/C/G. RNA nucleotides have ribose, phosphate, and A/U/C/G. So the nucleotides with ribose (sugar) and uracil (base) (bottom - right) and also the nucleotide with ribose and cytosine? Wait no, cytosine is in both. Wait, the bottom - right has ribose and uracil: uracil is not in DNA, and ribose is not in DNA's nucleotides. The top - right has ribose and cytosine: cytosine is in DNA (with deoxyribose). So the bottom - right (uracil + ribose + phosphate) and the top - right? Wait no, let's re - examine:
     - Top - left: sugar is deoxyribose (DNA's sugar), base guanine (in both) → DNA nucleotide.
     - Top - right: sugar is ribose (RNA's sugar), base cytosine (in both) → RNA nucleotide, but cytosine is in DNA (with deoxyribose). So this nucleotide (ribose + cytosine + phosphate) is in RNA but not DNA? Wait, DNA's cytosine is with deoxyribose, RNA's cytosine is with ribose. So the nucleotide (sugar - ribose, base - cytosine, phosphate) is in RNA but not DNA (since DNA's cytosine - containing nucleotide has deoxyribose). Similarly, the bottom - right: sugar - ribose, base - uracil (not in DNA), phosphate → in RNA but not DNA.
     - Bottom - left: sugar - deoxyribose, base - adenine (in both) → DNA nucleotide.
     - So the top - right (ribose, cytosine, phosphate) and bottom - right (ribose, uracil, phosphate) are nucleotides in RNA but not DNA? Wait, but let's check the problem statement: "Select all the nucleotides that can be found in RNA, but not DNA."
     - Let's break down each nucleotide:
       - Nucleotide 1 (top - left): Sugar = deoxyribose (DNA sugar), Base = guanine (in both) → present in DNA, so not selected.
       - Nucleotide 2 (top - right): Sugar = ribose (RNA sugar), Base = cytosine (in both, but in DNA with deoxyribose). So this nucleotide (ribose - cytosine - phosphate) is in RNA (since RNA has ribose and cytosine) and not in DNA (DNA has deoxyribose - cytosine - phosphate). So this is a nucleotide in RNA but not DNA.
       - Nucleotide 3 (bottom - left): Sugar = deoxyribose (DNA sugar), Base = adenine (in both) → present in DNA, not selected.
       - Nucleotide 4 (bottom - right): Sugar = ribose (RNA sugar), Base = uracil (only in RNA) → present in RNA, not in DNA (DNA has thymine instead of uracil, and deoxyribose instead of ribose). So this is a nucleotide in RNA but not DNA.
     - Wait, but maybe the question is about the nitrogenous base - sugar - phosphate combination. So the nucleotides with ribose (sugar) and either cytosine or uracil (but uracil is unique) and also, the ribose - cytosine - phosphate is in RNA but not DNA (since DNA's cytosine is with deoxyribose). But let's check the structures:
       - The top - right has ribose (the sugar has two OH groups on the 2' and 3' carbons, while deoxyribose has one OH on 3' and H on 2'). The bottom - right also has ribose. The top - left and bottom - left have deoxyribose (one OH on 3', H on 2').
       - So the top - right (ribose, cytosine, phosphate) and bottom - right (ribose, uracil, phosphate) are the nucleotides in RNA but not DNA. But wait, cytosine is present in both DNA and RNA, but the nucleotide (sugar - ribose, base - cytosine, phosphate) is only in RNA (since DNA's cytosine - containing nucleotide has deoxyribose). And uracil - containing nucleotide (with ribose) is only in RNA.
     - But maybe the intended answer is the bottom - right (uracil + ribose + phosphate) and the top - right (cytosine + ribose + phosphate)? Wait, no, let's re - read the problem: "Select all the nucleotides that can be found in RNA, but not DNA."
     - Let's list the components:
       - DNA nucleotides: deoxyribose, phosphate, A, T, C, G.
       - RNA nucleotides: ribose, phosphate, A, U, C, G.
       - So a nucleotide is in RNA but not DNA if its sugar is ribose (not deoxyribose) and/or its base is U (not T), and the combination (sugar - base - phosphate) is not in DNA.
       - So the nucleotide with ribose, cytosine, phosphate: DNA has deoxyribose, cytosine, phosphate. So this ribose - cytosine - phosphate is in RNA but not DNA.
       - The nucleotide with ribose, uracil, phosphate: DNA has no uracil and no ribose - uracil - phosphate, so this is in RNA but not DNA.
       - The other two have deoxyribose, so they are in DNA (and maybe RNA? No, RNA has ribose). Wait, RNA's nucleotides have ribose, so the ones with deoxyribose are DNA nucleotides.
     - So the top - right (ribose, cytosine, phosphate) and bottom - right (ribose, uracil, phosphate) are the nucleotides in RNA but not DNA. But maybe the question is considering that cytosine is in both, but the sugar is different. However, the key difference in bases is uracil (instead of thymine) and sugar is ribose (instead of deoxyribose). So the nucleotide with uracil (bottom - right) and the nucleotide with ribose and cytosine (top - right) are both in RNA but not DNA? Wait, no, cytosine is in both, but the nucleotide (sugar - ribose, base - cytosine) is only in RNA. But maybe the intended answer is the bottom - right (uracil - ribose - phosphate) and the top - right (cytosine - ribose - phosphate)? Wait, let's check the structures again:
       - Top - right: sugar is ribose (two OH on 2' and 3'), base is cytosine.
       - Bottom - right: sugar is ribose, base is uracil.
       - Top - left: sugar is deoxyribose (H on 2', OH on 3'), base is guanine.
       - Bottom - left: sugar is deoxyribose, base is adenine.
     - So the nucleotides with ribose (top - right and bottom - right) are in RNA. The ones with deoxyribose (top - left and bottom - left) are in DNA. Now, among the ribose - containing nucleotides:
       - Top - right: base is cytosine (also in DNA, but with deoxyribose). So this nucleotide (ribose - cytosine - phosphate) is in RNA but not DNA (since DNA's cytosine - nucleotide has deoxyribose).
       - Bottom - right: base is uracil (not in DNA), sugar is ribose (not in DNA's nucleotides). So this is in RNA but not DNA.
     - So both top - right and bottom - right should be selected? Wait, but maybe the question is simpler: RNA has uracil (instead of thymine) and ribose (instead of deoxyribose). So the nucleotide with uracil (bottom - right) and the nucleotide with ribose (top - right, since its sugar is ribose) are the ones. But let's confirm:
       - The problem says "nucleotides that can be found in RNA, but not DNA". A nucleotide is a combination of sugar, phosphate, and base. So:
         - DNA nucleotides: deoxyribose + phosphate + (A, T, C, G)
         - RNA nucleotides: ribose + phosphate + (A, U, C, G)
         - So the nucleotides with ribose + phosphate + C (top - right) and ribose + phosphate + U (bottom - right) are in RNA but not DNA (because DNA has deoxyribose + phosphate + C and deoxyribose + phosphate + T (instead of U)).
         - The nucleotides with deoxyribose + phosphate + G (top - left) and deoxyribose + phosphate + A (bottom - left) are in DNA (and not unique to RNA).
     - So the correct nucleotides are the top - right (ribose, cytosine, phosphate) and bottom - right (ribose, uracil, phosphate). But maybe the question is considering that cytosine is in both, but the sugar is different. However, the key is that the nucleotide (sugar - ribose, base - uracil) is unique, and (sugar - ribose, base - cytosine) is also in RNA but not DNA (since DNA's cytosine - nucleotide has deoxyribose).
# Answer:
The nucleotides are the one with ribose (sugar), cytosine (base), and phosphate group (top - right) and the one with ribose (sugar), uracil (base), and phosphate group (bottom - right). If we consider the labels (assuming the four are labeled as 1 (top - left), 2 (top - right), 3 (bottom - left), 4 (bottom - right)), the answers are 2 and 4.

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