After Harry was accepted to Hogwarts in 1991, Hagrid was given the task of actually locating Harry, as Harry's uncle Vernon was doing everything in his power to prevent his nephew from receiving his Hogwarts acceptance letter.
Sucrose is a disaccharide that yeast cells convert to glucose for alcoholic fermentation. When the yeast cells produce CO 2, this gas is trapped in bubbles in a layer of foam. Your teacher will pass around a cup with a foam layer so you will know what it looks like.
Alcoholic fermentation is the magical biological process that turns grape juice into wine. While we commonly know that during fermentation yeast covert sugar into alcohol, not all types of fermentation will result in alcohol, like in the case of sauerkraut.