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Yes. It really should have been refrigerated before opening, too.
Yes. Homemade marinade should be refrigerated, and purchased marinade should be refrigerated after opening.
Yes. Homemade marinade should be refrigerated, and purchased marinade should be refrigerated after opening.
No - unless the label states "keep refrigerated" which should mean that it was in the refrigerated case when you purchased it.
UHT milk should be stored in a fridge (<5°C) after opening.
No, you do not need to refrigerate preserves after opening, but some brands recommend it. However, the high amounts of sugar act as preservatives to help the food last.
Yes. Any minimally processed vegetable should be refrigerated.
Yes, since there are no natural preservatives in pesto, it should be refrigerated.
It depends on the recipe and what the intended outcome needs to be. Glycerin (vegetable for food use) provides more elasticity and helps the food substance to retain moisture so that it does not begin to crackle and/or flake. For example, if you are making an icing for a cake, and the recipe requires glycerin (vegetable, of course), then you should not substitute corn syrup, otherwise you could end up with a icing that looks like a dried mud flat out in some desert. Corn syrup is a glucose based concoction and is high in caloric content as well. Glycerin is low in caloric content, provides elasticity, and retains moisture.
No, they should not be refrigerated.
Yes, Hawaiian Punch should be refrigerated after opening to prevent bacteria from growing.
If kept refrigerated, they'll hold up for a year. They should be discarded after that. If they discolor under refrigeration after a while, they should be discarded then.