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OCR A Level Biology 12,16,20 autumn resit

Reply 80

hn-19

4

Does someone have the 2019 papers?

Reply 81

lapinacolada

13

Original post by hn-19

I also wrote the exact same thing, but after reading other people's answers I think that we're probably wrong :frown:

No we’re right. I didn’t mention facilitated diffusion because I didn’t think it was relevant, it’s just diffusion but with a channel protein. If you google the graphs this is what comes up anyway.

Reply 82

rmzoo

13

Original post by lapinacolada

No we’re right. I didn’t mention facilitated diffusion because I didn’t think it was relevant, it’s just diffusion but with a channel protein. If you google the graphs this is what comes up anyway.

omggg thank God!! thanks for this

Reply 83

rmzoo

13

guys what did you write for the first 6 marker the glucose maltose yeast blabla one i literally had no clue what they wanted me to say for 6 marks i didnt even understand the student’s conclusions

Reply 84

hn-19

4

Original post by lapinacolada

No we’re right. I didn’t mention facilitated diffusion because I didn’t think it was relevant, it’s just diffusion but with a channel protein. If you google the graphs this is what comes up anyway.

thank you so much!!

Reply 85

lapinacolada

13

Original post by ramzinoo

omggg thank God!! thanks for this

Spoiler

Don’t thank me, just have a bit of faith in yourself. You guys worked hard, I’m sure you did a fab job

Reply 86

marvelm

10

Original post by lapinacolada

No we’re right. I didn’t mention facilitated diffusion because I didn’t think it was relevant, it’s just diffusion but with a channel protein. If you google the graphs this is what comes up anyway.

That’s great I flopped that then oops

Reply 87

eibmathsresit

OP

7

questions i can remember
adenine 1 mark
what reaction of atp to adp 1mark
atp mass 2 marks
active transport diffusion 4 marks
dnp inhibiting respiration 4 mark
tlc question (4 marks in total)
rf value 3 marks
predict colour
polar molecule (1 mark)
why can’t it cross cell membrane?2 marks
microscope
neurones 4 marks
respiration practical control variables
negative control question
describe how he can calculate the rate of respiration3 marks
describe his claims on respiration6 marks
gaseous tissue box tick question 3 marks
spirometer
tidal volume 1 mark
vital capacity2 marks
compare and contrast the graph6 marks
fill in the blanks 5 marks
have i left any out?

Reply 88

rmzoo

13

guys i wrote respirometer instead of spirometer LOL do u think it’s possible i’d get the mark

Reply 89

MegBeard30

8

What did u guys do for the graph question??? Cause I just drew a line for 3marks??

Reply 90

rmzoo

13

Original post by MegBeard30

What did u guys do for the graph question??? Cause I just drew a line for 3marks??

i plotted the points, took me a while though but i didnt know what else i could do for 3 marks

Reply 91

hn-19

4

Original post by MegBeard30

What did u guys do for the graph question??? Cause I just drew a line for 3marks??

mine was pretty much a straight line, I took so much time in calculating the logs though.

Reply 92

fthd1999

11

Original post by eibmathsresit

questions i can remember
adenine 1 mark
what reaction of atp to adp 1mark
atp mass 2 marks
active transport diffusion 4 marks
dnp inhibiting respiration 4 mark
tlc question (4 marks in total)
rf value 3 marks
predict colour
polar molecule (1 mark)
why can’t it cross cell membrane?2 marks
microscope
neurones 4 marks
respiration practical control variables
negative control question
describe how he can calculate the rate of respiration3 marks
describe his claims on respiration6 marks
gaseous tissue box tick question 3 marks
spirometer
tidal volume 1 mark
vital capacity2 marks
compare and contrast the graph6 marks
fill in the blanks 5 marks
have i left any out?

The decrease in CO2 concentration on RuGP and GP (3 marks )

Reply 93

fthd1999

11

Original post by hn-19

mine was pretty much a straight line, I took so much time in calculating the logs though.

It shouldn’t be just a straight line . It should be slightly exponential

Reply 94

cannedtuna

3

Original post by hn-19

mine was pretty much a straight line, I took so much time in calculating the logs though.

isnt the log setting on your calculator?

Reply 95

rmzoo

13

guys what did u write for the how can the student calculate rate of respiration for 3 marks one

Reply 96

MegBeard30

8

Original post by cannedtuna

isnt the log setting on your calculators

Umm where did you guys get the info for the log graph? Cause I missed that ...

Reply 97

eibmathsresit

OP

7

i

Original post by ramzinoo

guys what did u write for the how can the student calculate rate of respiration for 3 marks one

i just said volume of gas collected in a given time from the graph over the given time so y2-y1/x2-x1 and showed an example of the rate of respiration for glucose being 2.14 when 15cm3/7