Incorrect solution for Multiple Choice, VCAA Sample Exam 2013-2016

[huaxiadragon]

OK, So I happen to be going through the sample exam for the new study design.

http://www.vcaa.vic.edu.au/Documents/vce/chemistry/Chemistryexamsample.pdf

Question 9 of the Multiple choice.

Clearly
Bond A is a hydrogen bond (Secondary, also possibly tertiary. BUT NO WAY ITS PRIMARY)
Bond B is a disulphide bridge (Tertiary),
Bond C is a covalent Bond (Primary)

So either Im seriously wrong, or VCAA forgot to double check their solutions lol

I believe (strongly) that the answer should be B, however VCAA said it's D

P.S All other multiple choice solutions seems to be correct though

[REBORN]

I went D first glance on the basis of bond B (disulfide link) which is secondary and D is the only answer that contains that. Would have got lucky :p

EDIT: Just read your whole post. I didn't know S-S was tertiary...? But it's been a long time since u3 chem

[pi]

Disulfide bonds are secondary for sure. I don't think any of those options are correct imo.

edit: upon googling, disulfide bonds can be either secondary or tertiary, hence B is probably the most correct answer.

[Nobby]

Disulfide bonds are secondary for sure. I don't think any of those options are correct imo.

I think they're tertiary.

[pi]

Disulfide bonds are secondary for sure. I don't think any of those options are correct imo.

I think they're tertiary.

Edited my post, it seems they can be either depending on the protein.

[huaxiadragon]

Well even if we can have disulfide linkages in secondary structure as well. There's no way Bond A is in primary structure

[pi]

What I found most surprising was labelling C as anything but Primary haha