Thename of the aminoacyl-tRNA is usually abbre-viated to fMet-tRNA f .The initiator tRNA gains its modified aminoacid in a two-stage reaction. First, it is chargedwith the amino acid to generate Met-tRNA f ;and then the formylation reaction shown in FIGURE 8.12 blocks the free NH 2 group.
Here's how this might work with multiplication facts. You can make a multiplication table. Since 1 times any number is just that number, we can leave the 1's off. Multiplying a number on the left by a number on the top gives you the number (product) where the row (across) meets the column (down).
Rule of Sum. The rule of sum, like the rule of product, is a basic counting principle. It is the idea that if we have a ways of doing something and b ways of doing another thing and we cannot do both at the same time, then there are a + b ways to choose one of the actions. Consider a modification to the pizza example.