Trademarks and bullet-points.

I have two questions today. One may have already been answered in the past, but I couldn't find it.

The first question deals with adding a period at the end of a bullet-point topic. In Test 1 and 2, we were supposed to add a period after the subject of each topic, such as Anthologies or Litblogs. Why do we add a period after the topics? A lot of teachers in various departments always discouraged one-word sentences, or two-word sentences. Wouldn't a colon, or semi-colon be more effective in these cases since the author is trying to describe or define the topic?

My second question deals with trademarks. When do we, as copyeditors, put in the trademark logo when we come across a brand-name that's being used in the manuscript? Do we have to wait for certain copyrights to be handed over, or are we allowed to leave it as it is?