1. Scientists are mimicking naturally-occurring mechanisms in nature (such as DNA) in order to develop better design plans for various manmade technologies.
2. If (1) is true, this assumes that these naturally occurring mechanisms are themselves designed, since they evince design plans superior to human design plans.
3. Therefore, these naturally-occurring mechanisms (such as DNA) are designed, otherwise they would not be candidates for imitation by technologies.
A high school student should be able to spot the trouble with this syllogism: premise number 2 is arbitrary, and leads to faulty conclusion (3).
Here's my own example of a faulty syllogism:
1. God designed everything.
2. Microchips are designed.
3. God designed microchips.
Easy, isn't it?