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B3 Biology Edexcel Exam

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Did anyone else put oxygen for the second question, I only put that because oxygen is used in fermenters most of the time?

Yeah, i put carbon dioxide and then crossed it out and put oxygen. Apparently the answer was carbon dioxide because it mentioned at the start of the question that the microalgae are photosynthetic

Reply 61

rochellerox

What did people put for the urea question? (about why concentration of urea increases)

Reply 62

J__

Original post by rochellerox

What did people put for the urea question? (about why concentration of urea increases)

It increases because the collecting duct is where all of the nephrons join, so all the urea from all the nephrons join together. Where as the one point was only one nephron.

Reply 63

jj.repinec

Original post by Heythere4567

I hope so too as I get paranoid that I made silly mistakes that may cost me the higher grades if the grade boundaries are high. They usually stay around 47-51 for an A*

The 2015 paper grade boundaries were 53 for an A* and I thought that was the hardest paper out of the three

Reply 64

TSR778899

Original post by rochellerox

What did people put for the urea question? (about why concentration of urea increases)

I put because the collecting duct connects many nephrons together so urea from many nephrons will be in the collecting duct. This increases the concentration of urea

Reply 65

a-mariaa28

Original post by tylmry

^Apparently I'm the only one who put Nitrogen on that question .-.

I put Nitrogen too

Reply 66

glowanti

Original post by albertquar

Man... I was shook that entire paper. What did you put for the monoclonal antibodies and blood clotting question? I think I messed up on that one.

Doctors put markers on monoclonal antibodies and inject them into the patient where they will bind with the antigen on the blood clots, because the doctors are tracking the markers on the antibodies they are able to locate the position of blood clots

Reply 67

XherdanXhaka

i got 53% for the the calculation, oxygen for the answer for algae but would 53 be right as i did get 52.94, but rounded to 1dp? And how about the 3 marker on Ice Age?

Reply 68

GeorgeBak

I talked about how they had to move across the frozen seas to other countries like Africa and Asia and adapt to the environment and make tools to hunt for food and prey.

Reply 69

GeorgeBak

Original post by XherdanXhaka

i got 53% for the the calculation, oxygen for the answer for algae but would 53 be right as i did get 52.94, but rounded to 1dp? And how about the 3 marker on Ice Age?

I put 53 also

Reply 70

emihod

I must have misread the question, but why was the answer to the punett square question 0% and not 50%?

Reply 71

hughw2304

the mum was XH XH
the dad was Xh Y
the possibilities would be {XH Xh} {XH Xh} {XH Y} {XH Y} it would have to be 2 h's in the female to be hemophilia. because if it is a male you will need the Y from the dad then you cant get the dads h so you cant have it making it 0%.

(edited 7 years ago)

Reply 72

JerryG

What stage of the menstrual cycle did the graph show at day 10?

Reply 73

SophFlorence

Original post by JerryG

What stage of the menstrual cycle did the graph show at day 10?

I said menstruation

Reply 74

Farrahjaber

Original post by SophFlorence

I said menstruation

I said the thickening of the lining

Reply 75

Laila1999

Did we have to put the words selective re absorption or could we just say and the convoluted tubules to the blood glucose is selectively reabsorbed at the against the concentration