partially permeable or selectively permeable?

so I'm revising for my bio paper 1 tomorrow (a level ocr A), and bio membranes is on the list. For osmosis, is it selectively permeable or partially permeable membrane? One is not allowed but I can never seem to remember which one!

Reply 1

Shambhavi.mohare

its partially permeable

Reply 2

not_applicable

Original post by Shambhavi.mohare

its partially permeable

thanks!

Reply 3

Doraxx

i thought partially permeable and selectively permeable were both allowed. isnt it just semi permeable that is not allowed?

Original post by Shambhavi.mohare

its partially permeable

Reply 4

Shambhavi.mohare

Original post by Doraxx

i thought partially permeable and selectively permeable were both allowed. isnt it just semi permeable that is not allowed?

umm the spec says and I quote "Osmosis to be explained in terms of a water
potental gradient across a partally-permeable
membrane." I'm not sure if selectively permeable and partially permeable are the same things

Reply 5

overworked-sling

partialy permeable i the term used in GCSE and selectively permeable is the term used in A-level biology
Sometimes (e.g. at A-level the word selectively is used instead of partially. Both acceptable on mark scheme but NOT ‘semi’)

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