Number of N or O atoms in a nitrogen base

This type of question, asked 4 times: May 2022 S1, 3 May 2023 S2, 4 May 2023 S2, 16 May 2023 S1. All 4 questions below, oldest first.

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Question 1
May 2022 S1
79 $Which among following compounds possesses highest number of N atoms in it?$
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Question 2
3 May 2023 S2
58 $What is the number of moles of N atoms and number of moles of O atoms respectively present in one mole of uracil?$
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Question 3
4 May 2023 S2
77 $What is the number of moles of nitrogen atoms present in one mole cytosine?$
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Question 4
16 May 2023 S1
70 $What is the number of moles of oxygen and number of moles of N atoms respectively present in one mole thymine?$
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Question 1