well, anytime you camp in a tent you run the risk, but tjust make sure you keep food and anything edible that they can smell far away from you or preferably locked away in a cooler or vehicle. but yea other than that you should be fine.

id pick a slighty bigger tent , just for the room, If a bear wants to come in and cuddle with you, it dont matter what tent you have.

keep your camp clean and no food left laying around, use a bearbag if you can ,, make sure its atleast 9 foot off the ground and not near the tree itself.

A Bear or moose could just walk right through any tent, big or small. Have you ever seen pictures of bears in Yosemite just ripping off a car door from top to bottom to get the food inside. On the TV show Alaskan experience, two people are living in a large canvas tent and constantly are on the lookout for the bears. There best defense besides a gun is a whistle, believe it or not.

Make sure to cook and store all food away from your tent. Tie up far from ur campsite.
http://www.backpackinglight.com/cgi-bin/backpackinglight/bear_bag_hanging_technique.html
Another preventive method is to get a bear proof container. This run about $70 but can be well worth it if u plan to do a lot of camping in bear country.
As previously mentioned loud noises scare away animals. Another rumered method is to urinate around your campsite.
Other than that no one man tent (or any tent for that matter) will keep you safe on it's own.
The biggest think to remember is if you dont bother they usually wont bother you if conflict is unavoidable try backing down or playing dead but DONT run. Stand still. Running will only encourage an attack.

tents are made of cloth or some similar material, they will not stand up to a bear, mountain lion claws and teeth, or a moose's holves and antlers.
Consider it like the wrapper on a candy bar, it keeps it dry and cozy, but doesn't stop you from eating it.