GCSE OCR 21st Century B7 C7 P7 - W/C - Monday 20th June 2016 Watch

Protostar
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#141
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#141
(Original post by realsmilee)
This is really random..

But why is a virus a vector?

I understand a plasmid is a vector because - they are small rings of DNA, easy to modify - and - they are small and can move in and out of bacterial cells easily.

But, why a virus?..
My guess would be because viruses seek out cells to penetrate into to reproduce, as this is the only way they can - therefore they can easily pass the new genes into cells I guess? Also they're really small? I'm not sure
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nurfgunlou
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#142
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#142
Does anyone have the mark scheme for the 2015 paper?
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realsmilee
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#143
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(Original post by NiamhM1801)
My guess would be because viruses seek out cells to penetrate into to reproduce, as this is the only way they can - therefore they can easily pass the new genes into cells I guess? Also they're really small? I'm not sure
Ahhh thank you!

Do you have any predictions or resources?
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Protostar
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#144
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(Original post by realsmilee)
Ahhh thank you!

Do you have any predictions or resources?
You're welcome
And I don't have any predictions, however there's a YouTube channel that I think is called Frances Dowle or something, which has videos where they basically make a huge mind map for each sub-topic within a unit - they can be quite helpful
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rebbarn29
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#145
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#145
This playlist of Youtube videos is good! https://www.youtube.com/watch?v=B5kT...QlfeTuokxDscHW


(Original post by realsmilee)
Ahhh thank you!

Do you have any predictions or resources?
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realsmilee
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#146
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(Original post by rebbarn29)
This playlist of Youtube videos is good! https://www.youtube.com/watch?v=B5kT...QlfeTuokxDscHW
Thank you!
And Niamh too

You guys will do great tomorrow!
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rebbarn29
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#147
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#147
Can someone please explain how genetic modification is used for making crops herbicide resistant.
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rebbarn29
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#148
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#148
Thank you! Good Luck tomorrow

(Original post by realsmilee)
Thank you!
And Niamh too

You guys will do great tomorrow!
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Protostar
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#149
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#149
(Original post by rebbarn29)
Can someone please explain how genetic modification is used for making crops herbicide resistant.
-some plants have natural herbicide resistance
-you can cut out the gene responsible for this and transfer it to a useful plant
-this gene will then be reproduced in all of the plants cells
-the new plant will then be herbicide resistant

In incredibly basic terms
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Protostar
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#150
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(Original post by realsmilee)
Thank you!
And Niamh too

You guys will do great tomorrow!
Thank you, you will too
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Alexandra00
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#151
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#151
(Original post by nurfgunlou)
Does anyone have the mark scheme for the 2015 paper?
https://smhw-production.s3.amazonaws..._MS_June15.pdf
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Mr. Flibble
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#152
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#152
I teach P7 and have made a nuch of videos here here if anyone's interested. Most of P7 covered with more bits and pieces coming this week

https://www.youtube.com/playlist?lis...XHC7Gz1ZblMMyu
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Protostar
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#153
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#153
Do you have the paper too?
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Jakir
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#154
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#154
Sorry for being so late
Attached files
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rebbarn29
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#155
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#155
Thanks

(Original post by NiamhM1801)
-some plants have natural herbicide resistance
-you can cut out the gene responsible for this and transfer it to a useful plant
-this gene will then be reproduced in all of the plants cells
-the new plant will then be herbicide resistant

In incredibly basic terms
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KomradeKorbyn
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#156
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#156
I've just created an OCR 21st Century Science Biology B7 Unnoficial Mark Scheme, feel free to come and suggest and discuss answers. http://www.thestudentroom.co.uk/show...8#post65942928
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rebbarn29
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#157
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#157
When was most of B7 in that B7 exam?!
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Speedbird129
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#158
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#158
(Original post by rebbarn29)
When was most of B7 in that B7 exam?!
I know, there was a lot of questions on ideas about science.
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MR.ANONYMOUS 786
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#159
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#159
I found it lemon de squeezy.


⚔🛡⚔~Nothing happens to anyone that he is not fitted by nature to bear - Maximus Decimus Meridius~⚔🛡⚔
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bonnie_x
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(Original post by Mr. Flibble)
I teach P7 and have made a nuch of videos here here if anyone's interested. Most of P7 covered with more bits and pieces coming this week

https://www.youtube.com/playlist?lis...XHC7Gz1ZblMMyu
Thank you so much!!
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