16) (二)簡答題 55% ※注意:請於試卷内之「非退择题作答區」標明題號依序作答。答題時回答要點,再開述要點細節。可用簡與簡明敘述輔助作答以中文或英文作答皆可 When you designing a pair of primers for a PCR reaction, how many nucleotides are typically included in each primer and why? (How many nucleotides = 5%； Why = 5%)