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Edexcel A2 Biology SNAB 6BI04 ~ 6BIO5 June 2016

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How does the carrot produce CO2 at the start of the investigation? Do you discuss the Decarboxylation in the Kreb's Cycle?

(edited 7 years ago)

Reply 1101

_H_V

What was the answer to the 5 % co2 in air increasing heart rate, I wanted to write increased co2 in blood causing ventilation to increase blah blah but it said 'heart rate' increased, I just talked about lack of oxygen so heart pumps more blood to compensate?

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Reply 1102

username2221225

Original post by Larache

How does the carrot produce CO2 at the start of the investigation? Do you doscuss the Decarboxylation in the Kreb's Cycle?

Yup.

Reply 1103

Daniel9998

Original post by Larache

How does the carrot produce CO2 at the start of the investigation? Do you doscuss the Decarboxylation in the Kreb's Cycle?

yeh I just talked about respiration and how CO2 is lost during links reactions and in the krebs cycle etc

Reply 1104

_H_V

Original post by GrandMasti

0.056 au min-1 for the mean rate of uptake

I got the same answer, but forgot to add min-1 in units, will I loose a mark?

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Reply 1105

SeanXd

Original post by _H_V

Talked about chemo-receptors in carotid artery detecting decrease in ph and the stages after that

Reply 1106

Daniel9998

Original post by _H_V

wasnt about lack of oxygen, increasing CO2 levels in the atmosphere means more CO2 inhaled and into the bloodstream, decreases ph as its more acidic. This is detected by chemoreceptors in carotid bodies etc, sends impuleses to medulla. Medulla then sends impulses to SAN more frequently etc etc

Reply 1107

Daniel9998

Original post by _H_V

I got the same answer, but forgot to add min-1 in units, will I loose a mark?

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I doubt you get a mark for units

Reply 1108

_H_V

Also, what was the answer to the six marker in question 7 about bacteria being able to take in co2 from engineering.

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Reply 1109

Larache

Original post by _H_V

Also, what was the answer to the six marker in question 7 about bacteria being able to take in co2 from engineering.

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The usual probably; identify the gene for removing CO2, use a restriction (endonuclease) enzyme to cut out the gene, place into a vector (such as a plasmid) and so on?

Reply 1110

ta97

for the first multiple choice, what happens to the number of myosin heads - decrease/ increase/ stay the same??

Reply 1111

emfs

Original post by Fuego1

for the first multiple choice, what happens to the number of myosin heads - decrease/ increase/ stay the same??

i put stays the same

Reply 1112

Daniel9998

Original post by Fuego1

for the first multiple choice, what happens to the number of myosin heads - decrease/ increase/ stay the same??

pretty certain it stays the same

Reply 1113

ta97

what did u lots put for the metabolic process about converting nitrogen into ammonia? wasn't even sure - just talked about enzymes (catalysts and lower activation e) , bacteria respiring and nitrogen being converted to nitrogen compounds in the soil by n-fixing bacteria. had no clue

Reply 1114

jirapat121

Original post by WhatALad

And the question on the properties of the virus in Q7? :s-smilie:

I put
- does not cause disease/illness
- detects cancer cells

I think you're meant to put it has a protein coat contains with glycoprotein so virus can attach to the cancer cells and that it contains enzymes such as integrase which allows the DNA of the assassin cells to integrate into the cancer cells' DNA ?

Reply 1115

ta97

Am I the only one that found unit 4 somewhat easier than unit 5 lol

Reply 1116

emfs

Original post by Algeriandz

I put 3 and got told afterwards it was 1 so that's a mark lost for me
:frown:

oh no! dont worry it was only one mark

it reminded me of a past paper question where it asked for number of myofibrils, and the answer was three. so that was why i nearly put three as well.

Original post by WhatALad

And the question on the properties of the virus in Q7? :s-smilie:

I put
- does not cause disease/illness
- detects cancer cells

lol i put cell membrane and viral dna
i wrote about why it was it good for use. but then i thought features meant structure
darn

Original post by malutki27

0.056

i got 0.103
what was the correct way? i did [0.3+4+5]/90 = 0.103

Original post by TSR Mustafa

Pretty good paper much easier than that unit 4 trash.

Screwed up on Metabolic pathway and L dopa questions tho :L
Hope the mark scheme isnt too high

yes! for the metabolic pathway i wrote about nitrogen-fixing bacteria in the soil. but i couldnt remember the exact process. i just babbled about and wrote what i thought the definition of a metabolic pathway was
the l-dopa confused me. i put that its a precursor to dopamine. from the gut it enters the blood plasma and then the brain where it converts to dopamine. before 90min the l-dopa was entering the gut, after 90min the l-dopa was leaving the gut, entering the blood plasma.
but i feel i missed something crucial

Reply 1117

_H_V

Original post by emfs

oh no! dont worry it was only one mark

it reminded me of a past paper question where it asked for number of myofibrils, and the answer was three. so that was why i nearly put three as well.

lol i put cell membrane and viral dna
i wrote about why it was it good for use. but then i thought features meant structure
darn

i got 0.103
what was the correct way? i did [0.3+4+5]/90 = 0.103

yes! for the metabolic pathway i wrote about nitrogen-fixing bacteria in the soil. but i couldnt remember the exact process. i just babbled about and wrote what i thought the definition of a metabolic pathway was
the l-dopa confused me. i put that its a precursor to dopamine. from the gut it enters the blood plasma and then the brain where it converts to dopamine. before 90min the l-dopa was entering the gut, after 90min the l-dopa was leaving the gut, entering the blood plasma.
but i feel i missed something crucial

I wrote too much dopamine neurotransmitters present in synapse (l-dopa converts into dopamine) not enough receptors on post synaptic membrane for all for dopamine to bind to so dopamine levels decreases as high concentration not needed?

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Reply 1118

_H_V

Original post by Larache

The usual probably; identify the gene for removing CO2, use a restriction (endonuclease) enzyme to cut out the gene, place into a vector (such as a plasmid) and so on?