Biology GCSE
colorimetric and indicator endpoints
What colorimetric and indicator endpoints means in Biology GCSE, as defined for OCR.
Definition of colorimetric and indicator endpoints
Check what you remember
Read the wording for your board, then hide it and explain colorimetric and indicator endpoints in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Timing a colour change until an end point, such as iodine no longer turning blue-black as amylase digests starch, or milk clearing with trypsin, where rate equals 1 divided by time.
Topics that use colorimetric and indicator endpoints
- Rates of enzyme-controlled reactions (OCR GCSE)
Related terms
- digital stopwatch
- gas collection apparatus
- graduated measuring syringes
- initial rate and tangent calculations
- parallax error
- pre-equilibration of biological reagents
- safe laboratory heating
- spotting tile sampling technique
Using colorimetric and indicator endpoints in the exam
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