Not really, they aren't necessarily far on either side. They arexamples of uniformed opinions, one of which is predominant on the left and one on the right (though with a sizable left component), but lots of the people with those opinions are otherwise moderate members of the right or left. Extremism and ignorance may correlate (or not), but at a minimum they are distinct issues.
I see both of those issues on both sides of the fence personally, just for different reasons.
I live in Southern USA and there's a lot of agriculture here, a lot of the farmers I know are conservative and anti-GMO. But I think they're mostly against it because of all the food patents and monopolies. Most of the left-leaning people I know are more against it because "we need more research/we have a poor understanding of nutrition".