Biology A-Level
Known standards
What Known standards means in Biology A-Level, as defined for OCR.
Definition of Known standards
Check what you remember
Read the wording for your board, then hide it and explain Known standards in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
Substances run on the same chromatogram under identical conditions, with which the sample's Rf values are compared to identify it.
Topics that use Known standards
- Biological molecules (OCR A-Level)
Related terms
- amylose and amylopectin
- Benedict's test for reducing and non-reducing sugars
- Biuret test for proteins
- Bonding and R-group interactions
- Carbon, hydrogen and oxygen
- Cellulose and microfibrils
- Cholesterol
- Cohesion and surface tension
Using Known standards in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Biology questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Biology A-Level termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge