AS BIOLOGY CAMBRIDGE may/june variant 1 2023 I 9700/11/M/J/23 SOLVED PAPER 1 + FREE NOTES!

[@ScamSulek-l3i]

thanks alot miss :)))))))

[@salmanayma3830]

For question no.29 .It’s epithelium also present in animals

[@mahmudakhatun8632]

Thanks

[@ada-raineferguson4565]

Please can you do 9700/12/m/j/2023 and 9700/13/m/j/2023 for preparation of the oct/nov exams!🙏

[@biologybel3araby799]

Please find the video for V2 on our channel

[@bunnyheart9979]

Does sucrose move into companion cell by facilitated diffusion or active transport

[@biologybel3araby799]

H+ are pumped out of companion cell into cell wall by proton pump using ATP (active). This creates a gradient. H+ then passes down concentration gradient along with sucorose through a carrier protein (sucrose against concentration gradient and H down concentration gradient). So in overall sucrose moves in by facilitated diffusion due to the gradient primary created by the active pumping of H+. Once inside companion cells, sucrose moves into seive tube through plasmodesmata by passive diffusion.

[@cappybaraeats]

@@biologybel3araby799 then why is the answer actively through cotransporter proteins? shouldnt it be passively cause no energy is being used as sucrose is just following down the H+ concentration gradient

[@cappybaraeats]

pls solve 9700 w2023 23

[@r4yy4n87]

plzz do variant 2 and 3 aswell

[@biologybel3araby799]

Please find the video for V2 on our channel

[@Taliban-f7]

Very bad

[@Osamabenladennochristians]

Agree