Effect of changing pH and temperature on the digestion of lactose in milk

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username2441075
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I need help with this exam question!! Thanks.

https://www.thestudentroom.co.uk/att...hmentid=599014
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Dusky Mauve
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What do you know about the pH of the stomach of mammals?
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hxrl3yB00
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Omg, is this Eduqas/WJEC by any chance?. Okay, so with this you need to know that the stomach is a fairly acidic place due to HCL. Now, look at the table? What's the pattern you see? With what I stated.... does it look like the stomach has the right conditions to produce lactase
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(Original post by Dusky Mauve)
What do you know about the pH of the stomach of mammals?
It is acidic... XD That's all, lol.
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(Original post by hxrl3yB00)
Omg, is this Eduqas/WJEC by any chance?. Okay, so with this you need to know that the stomach is a fairly acidic place due to HCL. Now, look at the table? What's the pattern you see? With what I stated.... does it look like the stomach has the right conditions to produce lactase
The acidic pHs digested slower and alkaline pHs took faster to digest the lactose.
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z33
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well what digests lactose? and what is that thing made up of? and how do those things react to extreme pH?
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hxrl3yB00
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(Original post by sweetstars)
The acidic pHs digested slower and alkaline pHs took faster to digest the lactose.
Yup, I believe to get full marks you need to state the conditions of the mammal stomach (acidic). Use figures from the table to prove why the statement is incorrect and use figures from the table to deduce a correct statement.
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(Original post by hxrl3yB00)
Yup, I believe to get full marks you need to state the conditions of the mammal stomach (acidic). Use figures from the table to prove why the statement is incorrect and use figures from the table to deduce a correct statement.
This statement is false as the stomach of mammals are in acidic conditions, therefore the lactose would not be able to digest quickly, because pH 4 - an acid -digested the lactose in 20 minutes, whereas pH 9 - an alkaline - digested it in 6 minutes.

Would that be good? The marks are out of 2, how excellent is this paragraph and how should I improve? Thanks.
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username2441075
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(Original post by z33)
well what digests lactose? and what is that thing made up of? and how do those things react to extreme pH?
The lactose digests the lipids in the lactose. Is lactose made of lipids and glucose? I dont know how to answer the last one tho...
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z33
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(Original post by sweetstars)
The lactose digests the lipids in the lactose. Is lactose made of lipids and glucose? I dont know how to answer the last one tho...
lactase digests lactose
what is lactase?
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(Original post by z33)
lactase digests lactose
what is lactase?
whoops I mean lactase...
Lactase is an enzyme that digests lipids - produced by the pancreas.
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hxrl3yB00
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(Original post by sweetstars)
This statement is false as the stomach of mammals are in acidic conditions, therefore the lactose would not be able to digest quickly, because pH 4 - an acid -digested the lactose in 20 minutes, whereas pH 9 - an alkaline - digested it in 6 minutes.

Would that be good? The marks are out of 2, how excellent is this paragraph and how should I improve? Thanks.
It's 2 marks? I thought it was 3.... and that should be perfectly fine !
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username2441075
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#13
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Thanks hopefully I do get two marks. It is my homework that my teacher gave me ^_^

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