The basic structure of two nucleotides is shown below - VCE - SSCE Biology - Question 2 - 2023 - Paper 1
Question 2
The basic structure of two nucleotides is shown below. Each nucleotide has three subunits.
A. subunit labelled X is a nitrogen base.
B. subunit labelled Y is a ribo... show full transcript
Worked Solution & Example Answer:The basic structure of two nucleotides is shown below - VCE - SSCE Biology - Question 2 - 2023 - Paper 1
Step 1
A. subunit labelled X is a nitrogen base.
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Answer
The subunit labelled X corresponds to uracil, which is a nitrogenous base found in RNA. Therefore, this statement is true.
Step 2
B. subunit labelled Y is a ribose sugar.
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Answer
The subunit labelled Y is attached to thymine. This suggests it is part of a nucleotide structure. Given that thymine is typically found in DNA, the sugar attached here would be deoxyribose, not ribose. Thus, this statement is false.
Step 3
C. nucleotide with the subunit labelled uracil can be found in DNA.
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Answer
Uracil is not present in DNA; it is exclusively found in RNA. Therefore, this statement is false.
Step 4
D. nucleotide with the subunit labelled thymine will have a pentose sugar subunit.
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Answer
Thymine, when part of a nucleotide, would indeed be connected to a pentose sugar (specifically deoxyribose in DNA). Consequently, this statement is true.
