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A molecule of transfer RNA could include the nucleotide sequence A - VCE - SSCE Biology - Question 4 - 2011 - Paper 1
Question 4
A molecule of transfer RNA could include the nucleotide sequence A. CTGCGAUTAC B. GGCUUUAAA C. CCUUTUGAG D. AAAATACCG
Worked Solution & Example Answer:A molecule of transfer RNA could include the nucleotide sequence A - VCE - SSCE Biology - Question 4 - 2011 - Paper 1
Step 1
Identify the correct nucleotide sequence
Answer
To determine which of the given options could be a valid nucleotide sequence for a molecule of transfer RNA (tRNA), we need to focus on what constitutes a tRNA sequence. Transfer RNA is made up of sequences of nucleotides that typically include adenine (A), uracil (U), cytosine (C), and guanine (G).
Evaluating each of the options:
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A. CTGCGAUTAC: This sequence includes 'T', which is not present in RNA as RNA uses 'U' instead of 'T'. Therefore, this sequence is invalid for tRNA.
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B. GGCUUUAAA: This sequence contains only A, U, C, and G. Since it consists solely of valid RNA nucleotides, this sequence is a candidate for a tRNA molecule.
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C. CCUUTUGAG: Similar to option A, this option includes 'T', rendering it invalid as tRNA.
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D. AAAATACCG: This sequence ends with 'T' and has an 'A' in the middle, which also makes it invalid for tRNA.
Based on the evaluation, the only valid nucleotide sequence for a tRNA molecule is option B.