GCSEStudent903
Badges: 13
Rep:
?
#1
Report Thread starter 1 year ago
#1
Decent paper! Here's my mark scheme - Rehaan

Q1 Osteoblast - Feedback
1.1
Positive feedback as more insulin produced
Which stimulates more osteoblasts (so deviates further from norm)
1.2
Acidic so more H+ which alter (polarity of) tertiarty structure
So active as complementary to receptors on membrane of Beta cells.

Q2 Rhiz B Cell Question
2.1
Spearman's Rank as looking for correlation.
2.2
The data shows conclusion as positive correlation.
But range for each point
Small sample/only 15
Unaware of effects overtime.
Unaware if healthy or cancer specifically killed.
2.3
1.8 x 10^8
2.4
Non functional NOCHAT1 so non-functional transcription factor
Mutated CD20/non-functional CD20 on membrane
So less Rhizo(?) binds so less death of B cells (as less destroyed)

Q3
CANT REMEMBER

Q4

Q5 (Was this the polar body one?)
a in both boxes.
33 mitochondria

Why is this treatement effective (removing nucleus and putting mitochondria disease cell body into egg).
Prevents inheritance as no nucleus
So when fertilised by sperm zygote will not have disease as no nucleus from mother's egg/may not even form successful zygote for that egg.

Q6 Ammonia
6.1
Microgram - small concentration of ammonia as bacteria
Per gram - allows for comparisons as per gram (so different initial masses accounted for)
6.2
4/5. something?

Graph shows more mRNA yet may not be equal to growth of bacteria. Why?
Not all mRNA translated
So not all secreted into soil as not all produced
So may not take up nitrates from soil
Nitrates used for growth. So cannot say that mRNA = growth.

Q7 Haemocytometer

5.8 something

Why bottom red blood cells counted?
Standardised readings
Bottom of one forms another square so accounted for.

ESSAY:

The importance of the control of movement in cells and organisms.

Calcium ions controlling muscle movement
Spindle fibres controlling chromosome movement
Carrier protein specificity controlling movement across membranes
Insulin controlling movement of glucose into cells
Muscle tissue in arteries controlling movement of blood in vessels
Control of movement of sodium and potassium ions in nerves by voltage gated channels
Enzymes in controlling cell cycle (off spec)
Regulation of gene expression and epigenetics
Control by tumour suppressor genes and protooncogene in tumour formation
IAA in controlling tropisms
Receptors and controlling heart rate as faster movement of blood etc

The importance of interactions
6
reply
_king_aj_23_
Badges: 8
Rep:
?
#2
Report 1 year ago
#2
Ugly Application questions as usual but in my opinion, beautiful essay questions.
4
reply
pploveash
Badges: 10
Rep:
?
#3
Report 1 year ago
#3
(Original post by GCSEStudent903)
Osteoblast - Feedback
1.1
Positive feedback as more insulin produced
Which stimulates more osteoblasts (so deviates further from norm)
1.2
pH alters
Omg i said that for 1.1 but for 1.2 i mentioned about H+ increasing so it activates it when it enters into the protein by active transport loll i was just waffling
0
reply
ari__minaj
Badges: 4
Rep:
?
#4
Report 1 year ago
#4
I didn't get to finish my essay 😭 Thanks to stupid application questions taking my time
5
reply
pploveash
Badges: 10
Rep:
?
#5
Report 1 year ago
#5
Is this enough for interaction in cells

*DIABETS (ALPHA CELLSS) (I INCLUDED THE IDEA OF PREGNANT WOMEN HAVING GLUCOSE IN URINE AND TEST FOR DIABETES)
* EPITELIAL CELLS (ABSORPTION AND I MENTIONED KIDNEYS)
* COURTSHIP BEHAVIOUR
* TAXONOMY
* XYLEM
*PHLOEM
* TCELLS AND BCELLS ( I MENTIONED ABOUT SCID)
i ran out of time 😭😭😭
1
reply
vinufailchem3
Badges: 0
Rep:
?
#6
Report 1 year ago
#6
What were the two essay titles?
0
reply
pploveash
Badges: 10
Rep:
?
#7
Report 1 year ago
#7
(Original post by pploveash)
Is this enough for interaction in cells

*DIABETS (ALPHA CELLSS) (I INCLUDED THE IDEA OF PREGNANT WOMEN HAVING GLUCOSE IN URINE AND TEST FOR DIABETES)
* EPITELIAL CELLS (ABSORPTION AND I MENTIONED KIDNEYS)
* COURTSHIP BEHAVIOUR
* TAXONOMY
* XYLEM
*PHLOEM
* TCELLS AND BCELLS ( I MENTIONED ABOUT SCID)
i ran out of time 😭😭😭
Sucession i mentioned
0
reply
AI212
Badges: 6
Rep:
?
#8
Report 1 year ago
#8
(Original post by pploveash)
Is this enough for interaction in cells

*DIABETS (ALPHA CELLSS) (I INCLUDED THE IDEA OF PREGNANT WOMEN HAVING GLUCOSE IN URINE AND TEST FOR DIABETES)
* EPITELIAL CELLS (ABSORPTION AND I MENTIONED KIDNEYS)
* COURTSHIP BEHAVIOUR
* TAXONOMY
* XYLEM
*PHLOEM
* TCELLS AND BCELLS ( I MENTIONED ABOUT SCID)
i ran out of time 😭😭😭
4 developed topics is all you need. I talked about diabetes, courtship behavior, succession, T cells and B cells, mycorrizhae
3
reply
pploveash
Badges: 10
Rep:
?
#9
Report 1 year ago
#9
(Original post by pploveash)
Is this enough for interaction in cells

*DIABETS (ALPHA CELLSS) (I INCLUDED THE IDEA OF PREGNANT WOMEN HAVING GLUCOSE IN URINE AND TEST FOR DIABETES)
* EPITELIAL CELLS (ABSORPTION AND I MENTIONED KIDNEYS)
* COURTSHIP BEHAVIOUR
* TAXONOMY
* XYLEM
*PHLOEM
* TCELLS AND BCELLS ( I MENTIONED ABOUT SCID)
i ran out of time 😭😭😭
I also mentioned sucession
0
reply
ppjk
Badges: 14
Rep:
?
#10
Report 1 year ago
#10
I got 33 for number of mitochondria in calculation
11
reply
ppjk
Badges: 14
Rep:
?
#11
Report 1 year ago
#11
Did you just multiply by 200 (or whatever the dilution was) for that calculation
3
reply
ppjk
Badges: 14
Rep:
?
#12
Report 1 year ago
#12
Why use micrometers and g-1?
1
reply
ha33an99
Badges: 7
Rep:
?
#13
Report 1 year ago
#13
I did the movement essay, linked movement of oxygen to cells with aerobic respiration to produce ATP for loads of other processes (muscle contraction, glucose co-transport etc). Anyone else take that approach/ a similar one?

I thought the paper was OK overall
7
reply
L.Adriannaxxxx
Badges: 4
Rep:
?
#14
Report 1 year ago
#14
Oh my gosh I think I messed the hell up - for the control one the first one I talked about :
-siRNA binding to mRNA and controlling it by not allowing it to do translation
-Control of the movement of phagocytosis on pathogens
-Movement of H+ in respiration
-movement of Calcium in presyanpic neurone
—and something else that I’ll add if I can remember
Someone please help
0
reply
Quantum18
Badges: 6
Rep:
?
#15
Report 1 year ago
#15
(Original post by ppjk)
I got 33 for number of mitochondria in calculation
I got 5112
28
reply
ha33an99
Badges: 7
Rep:
?
#16
Report 1 year ago
#16
(Original post by ppjk)
Why use micrometers and g-1?
I put micrometres to make it easier to read off the graph, and g-1 for comparison between different masses of soil
4
reply
abdised
Badges: 0
Rep:
?
#17
Report 1 year ago
#17
(Original post by vinufailchem3)
What were the two essay titles?
the importance of control of movement in cells and organisms q2 : the importance of interactions between cells and between organisms
0
reply
Ravi6312
Badges: 4
Rep:
?
#18
Report 1 year ago
#18
What did you guys get for the question about the haemoglobin and why the right and bottom are not counted???
0
reply
sharlot
Badges: 4
Rep:
?
#19
Report 1 year ago
#19
(Original post by Quantum18)
I got 5112
me too!
7
reply
username3694440
Badges: 15
Rep:
?
#20
Report 1 year ago
#20
control of movement:

calcium ions controlling muscle movement
spindle fibres controlling chromosome movement
carrier protein specificity controlling movement across membranes
insulin controlling movement of glucose into cells
muscle tissue in arteries controlling movement of blood in vessels
control of movement of sodium and potassium ions in nerves by voltage gated channels

do these sound okay?
3
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

If you do not get the A-level grades you want this summer, what is your likely next step?

Take autumn exams (240)
47.24%
Take exams next summer (68)
13.39%
Change uni choice through clearing (110)
21.65%
Apply to uni next year instead (53)
10.43%
I'm not applying to university (37)
7.28%

Watched Threads

View All