Given the background description of some cooking related query, summarize the question into a title

[EX Q]: I've been looking for a soda bread recipe to try and I notice that most of them contain buttermilk. Buttermilk is not a standard part of my pantry. Part of the appeal of soda bread is that it's quick to throw together, so having to go shopping for a specific ingredient interferes with the spontaneous aspect. I know there are lots of substitutions for buttermilk (using a bit of lemon juice in regular milk is the one I usually use), but I'm wondering what it is about buttermilk specifically that seems to be a standard part of soda bread. Is it just traditional? Or will it add a particularly noticeable flavour/texture?Edited to add: I know that its functional purpose is to provide an acid to react with the soda for rising; so is it just that it used to be the most convenient acid?
[EX A]: Why does soda bread call for buttermilk?

[EX Q]: Many a recipe or package instructs: 'cook uncovered' without stating a reason. As a general matter, is this to protect me from boilover, or does it have some more subtle purpose?
[EX A]: When a recipe says, 'simmer uncovered', what's the issue?

[EX Q]: Recently my cousin started to make yogurt. She told me that she puts diced, fresh fruit (strawberries, peaches) into the inoculated milk (pasteurized or sterilized, I don't know. 1) and then let this set in the oven at ~50°C for some hours. After this, she puts the yogurt into the fridge. She makes enough yogurt for ten days; on the tenth day she takes the last yogurt portion and makes some new. At the first thought I couldn't imagine that fresh fruits stay safe for ten days (I wouldn't eat cut fruits that stayed for ten days in the fridge!). But after some pondering I wondered if it's safe after all because the milk and the fruits are going to be cultured and undesired bacteria are going to be eliminated. I think freshly diced fruit only contain bacteria on the surface. 1 I saw a really big jug of milk. She lives in Georgia, US. I don't know what's the common treatment of milk there.
[EX A]:
Soon-to-be cultured milk with fresh fruit safe for consumption?