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).
For addition, the identity is zero, because adding zero to anything doesn't change anything. The inverse is the additive inverse: it's the same number, but with the opposite sign. For instance, suppose your number is â6, and you're adding. The identity is zero, and the inverse is 6, because â6 + 6 = 0. For multiplication, the identity is one, because multiplying by one doesn't change anything.