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Beta glucose - AS AQA Biology

Screen Shot 2015-05-29 at 14.09.27.png

So the question above, for my answer I circled the OH group on the right side of the first beta glucose and then a Hydrogen for the left side of the beta glucose of the right, but judging by the mark scheme this isn't correct. Could someone explain why to me? thanksssss
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coloott
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not sure but i think it would be the OH group on the top right of the first glucose, and just the H from the OH group on the top left of the second glucose.
I believe you're correct. What does the mark scheme say?
It shouldn't matter which side the OH and H was from. I'm almost certain that you're correct.
It must be a mark-scheme error.
After checking the Mark Scheme for that question, I can confirm that either way is accepted as it states:
"Two marks for box round two hydrogens and one of the oxygens from OH group on carbons 1 and 4"
it's a ß1:4 link, so you need to count the C atoms from the O to get to the right ones!

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