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check out this link:
http://www.madsci.org/posts/archives/2005-11/1132509463.Cb.r.html
what it basically says is that yeasts cannot use lactose becasue they cannot break it down into its components (galactose and glucose), so they can only use lactose when they are genetically engineered to produce lactase (an enzyme which breaks down lactose into its constituent sugars).
What else can I help you with?
Why salmonella typhimurium does not ferment lactose?
Salmonella typhimurium does not ferment lactose due to the absence of the necessary enzymes, specifically β-galactosidase, which is required to break down lactose into glucose and galactose. Instead, it primarily relies on other carbohydrates and proteins for energy. The inability to ferment lactose is a distinguishing feature used in laboratory identification and differentiation from other enteric bacteria, such as E. coli, which can ferment lactose.
What Disaccharide is produced by combining glucose and galactose?
Lactose is the disaccharide produced by combining glucose and galactose.
Why don't all disaccharides undergo fermentation with yeast?
Not all disaccharides undergo fermentation with yeast because yeast lacks the specific enzyme needed to break down certain disaccharides into fermentable sugars. For example, lactose, a disaccharide found in milk, requires the enzyme lactase to be broken down into glucose and galactose before yeast can ferment it.
Word equation for lactase hydrolyze lactose into glucose?
Lactase catalyzes the hydrolysis of lactose into glucose and galactose. This process can be represented by the following word equation: Lactose + Water → Glucose + Galactose.
Write the dehydration synthesis equation for lactose and melibiose in words?
The dehydration synthesis equation for lactose is: glucose + galactose -> lactose + water. The dehydration synthesis equation for melibiose is: glucose + galactose -> melibiose + water.
Does yeast ferment lactose?
Yes it does.
Is P vulgaris a lactose fermenter?
Yes, P. vulgaris is a lactose non-fermenter. It does not possess the enzyme beta-galactosidase needed to ferment lactose into glucose and galactose. Instead, it typically ferments sugars like glucose and sucrose.
What organisms can ferment lactose?
some prokaryotes mammalian muscle cells yeast
Does citrobacteria ferment lactose?
Yes, Citrobacter species are capable of fermenting lactose. They possess the necessary enzymes to break down lactose into glucose and galactose, allowing them to use lactose as a source of energy.
What monosaccharides are in milk?
lactose
What Disaccharide is produced by combining glucose and galactose?
Lactose is the disaccharide produced by combining glucose and galactose.
What will happen when yeast is added to a solution of lactose?
Since yeast will only have a reaction when it is able to break down an enzyme nothing will happen when it is added to lactose. Lactose does not contain the proper enzymes or glucose to cause a reaction.
What monosaccharides make up lactose?
Lactose is composed of two monosaccharides: glucose and galactose.
What is the difference between lactose and galactose?
Lactose is a disaccharide sugar made up of galactose and glucose molecules. Galactose is a monosaccharide sugar that is found in milk and dairy products. Lactose needs to be broken down into galactose and glucose in the body in order to be absorbed.
Why don't all disaccharides undergo fermentation with yeast?
Not all disaccharides undergo fermentation with yeast because yeast lacks the specific enzyme needed to break down certain disaccharides into fermentable sugars. For example, lactose, a disaccharide found in milk, requires the enzyme lactase to be broken down into glucose and galactose before yeast can ferment it.
What does galactose galactose and glucose make?
The monosaccharides galactose and glucose, when bonded together through a condensation reaction, form the disaccharide lactose.
Hydrolysis of lactose?
Glucose, galactose
