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AQA A-Level Biology Flashcards - Unit 1

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Study Level: A/AS Level
Examinator: AQA
Subject: A Level Biology
Unit: Unit 1 - Biological molecules

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Uploaded on: September 8, 2025
Number of pages: 50
Written in: 2023/2024
Type: Other
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biological molecules
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Unit 1 Flashcards

, What is the test for
reducing sugars?

QUESTION

Heat with Benedict's in
water bath for 5 minutes
Insoluble Cu2O red
precipitate
Turns orange-brown

ANSWER

, How is the Benedict's
test semi-quantitative?

QUESTION

Diﬀerence in colour
shows the approximate
concentration of
reducing sugar in the
sample
ANSWER

, What is the test for
non-reducing sugars?

QUESTION

Perform reducing sugars test given
negative result
Heat with dilute HCl in water bath for 5
minutes to hydrolyse the disaccharides
into monosaccharides
Neutralise with NaHCO3 as Benedict's
does not work in acidic conditions
Heat with Benedict's, if non reducing
sugars were initially present reducing
sugars will be now and will give orange-
brown colour

ANSWER

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