Looking Inside

I put on the full beekeeper's outfit and even used the smoker for the first time. I wanted to get a better look inside which I haven't done so far except for the ends. This photo is the left side (from the back). The hive is 4 ft long and there is comb almost to both ends. The end bar is shown - which is plexiglass so you can see through it. I pulled that bar out so you could see that the bees are applying propolis to it as well and built comb on the one on the other side.

When I moved a few bars, part of the comb fell to the bottom. Some of the cells are sealed. Are these drone cells?