Given 21 molecules of protein A, we find the corresponding number of protein B molecules.
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- Thus, the total number of nucleons is \(\boxed{12}\).
- A virologist studying viral capsid proteins observes that the ratio of capsid protein A to capsid protein B is $7:5$. If there are 21 molecules of protein A, how many total molecules of both proteins are present?
- The ratio of capsid protein A to capsid protein B is \(7:5\). This means for every 7 molecules of protein A, there are 5 molecules of protein B.
- Let the number of protein B molecules be \(x\). Then:
- \frac{7}{5} = \frac{21}{x}
- 7x = 21 \times 5 = 105
