[badumdumtscht]

Ok, almost done. Took wayyy longer than I anticipated.

[cks123]

(Original post by TheRabbit)
1.a)i)Active transport is the process by which substances are moved in or out of the cell against a concentration gradient.
ii) Mitichondria for energy
iii) Microvilli for increased cell surface area
b) Transmembrane proteins
c)i) X is the matrix and is where the Kreb cycle occurs
Y is the cristae and is where electron transfer or terminal respiration occurs
ii) fewer folds in the wall as less ATP needs to be generated and the ATP is generated by electron transfer at the cristae

2.a) Humoral
b) i) B cell/lymphocyte
ii) I think it means recognise foreign antigen and mobilise cell response?
c) If there is reinfection memory cells can produce the antibody fast and in large quantities
d) Different viruses have different structures to their components, which are antigens, so an antibody which is able to interact with one virus can’t with another.
e)i) passive
ii) Allows a patient to be protected if their own immune system cannot mount enough of a immune reaction to deal with an infection; however the patient has no lasting immunity if there is reinfection

3. a) R Dd and S D (technically XDXd, XDY
ii)33%
iii) Son of T 0%, son of U 50%
3. b)i)mutation
ii) It may be missing a base or section, have an extra base or section or have a different order from normal
iii) Dystrophin is a protein made up of amino acids coded for in a particular order by the DNA bases in the gene if the gene is changed then the amino acids are in the wrong order or number so produced a different structure that will not work in the same way.
c)Family tree?

4.a)i) Trypsin breaks down the protein which is holding the colour to the films so the black is removed leaving a clear film
ii) temperature, size and type of photographic film, volume of trypsin solution
iii)repeat the experiment
v) There were more enzyme molecules available to break down the protein
vi) The maximum amount of substrate was being broken down at once – there was no more substrate for the extra enzyme to breakdown
b)i)duodenum
ii) Otherwise they would breakdown the cell that produces them
iii) cofactors or modulators

5.a)i) X is the sino-atrial node or SAN, Y is the atrio-ventricular node, AVN
ii) Atrial contraction
iii) Down the middle bit and up the sides
b)i) mitral or bicuspid
ii)ventricular contraction

10. a) 51 wks
b) all but 7
c) 1. Normal variation
2. Developmental abnormality
d)i) Maturation (I think)
ii) Myelination of the motor nerves to the muscles of the lower limbs

11. a) Randomisation of individuals to groups, going for 2 groups of similar individuals (age, gender, occupation)
b) Something to do with short term memory
c) To fill up short term memory so that the test words would be pushed out and longterm memory was tested
d) People remember fewer words correctly after a period of an hour and people are more likely to correctly remember related words after an hour (than unrelated words)

12. a)i) Birth rate is falling and an increasingly sharp rate during stage 2 and then flattens out to a fairly constant level in stage 3
ii) At the start of stage 2 death rates are falling more rapidly than birth rate so population is gwoing, this growth increases as the gap between the rate in fall of death rate increases compared to the rate of fall in birth rates. As we come to the end of stage 2 the gap between birth and death rates narrows as death rates decrease at a slower rate and birth rate decreases at a higher rate so that they are both at roughly the same number of people going into stage 3.
iii) Improved healthcare due to knowledge and technology, more food available and better diet, cleaner water
b)i) Pesticides can skew the food web by removing one organism from the web allowing the amount of its prey or food to rise and providing more food for any organism which shares the pesticide killed organisms food. SO you either get excess of the food/prey or excess of another organism which normally competes with it for food. [yeah I’m tired hence poor explanantion!]
ii) Crop rotation, monoculture?
c)i) A sudden rise in algal population in an aquatic environment
ii) The bloom may block the light from reaching below it, meaning other aquatic plants die (so less O2 from photosynthesis), and the algae doesn’t survive very long and with the other plants starts to rot and decay which uses up the O2. The O2 in the water decreases killing fish and other lifeforms.

I think you may have the conclusion question wrong, I could be wrong but the results show th people were able to remember unrelated words better than related ones after an hour. Is that right ?

This was posted from The Student Room's Android App on my GT-S5830

[TheRabbit]

(Original post by cks123)
I think you may have the conclusion question wrong, I could be wrong but the results show th people were able to remember unrelated words better than related ones after an hour. Is that right ?

This was posted from The Student Room's Android App on my GT-S5830

Yes that is right (what you are saying - 78% to 54%)

[nerd434]

(Original post by TheRabbit)
Yes that is right (what you are saying - 78% to 54%)

This is to everyone: Can I just ask, is the Human Biology teacher normally just a Biology teacher?

[TheRabbit]

(Original post by nerd434)
This is to everyone: Can I just ask, is the Human Biology teacher normally just a Biology teacher?

Yes, it is as its just got a slightly different focus from straight bio.

[cks123]

Can someone do question 7 please ? Thanks

This was posted from The Student Room's Android App on my GT-S5830

[TheRabbit]

(Original post by cks123)
Can someone do question 7 please ? Thanks

This was posted from The Student Room's Android App on my GT-S5830

Woops, totally didn't notice I'd missed half the paper - I'm a bit brain dead in the evenings. Not sure where Badumdumtsht has got to with those essays.

[David Young]

(Original post by TheRabbit)
Woops, totally didn't notice I'd missed half the paper - I'm a bit brain dead in the evenings. Not sure where Badumdumtsht has got to with those essays.

and 6,8,9 if possible thanks

[TheRabbit]

(Original post by David Young)
and 6,8,9 if possible thanks

Yeah I know someone should have said! I have an exam on Monday but when if I get a free minute I'll have a look.

[cks123]

(Original post by TheRabbit)
Woops, totally didn't notice I'd missed half the paper - I'm a bit brain dead in the evenings. Not sure where Badumdumtsht has got to with those essays.

Ano its strange

This was posted from The Student Room's Android App on my GT-S5830

[cks123]

For the variable question would the SQA accept concentration of gelatine ?

This was posted from The Student Room's Android App on my GT-S5830

[TheRabbit]

Right here is the bit a missed.

I haven't studied reproduction for 3 years so its all a bit rusty so my answers are incomplete

6.a) progesterone
b)i)Stimulate endometrial growth
Increase uterine growth?
ii) LH secretion
c) They stay high and do not dip? Sorry don't know
d)i)
ii)

7.a) no change in rate (14 breaths/min) but increase in volume (480 to 1220 cm³)
b) 18 breaths/min
c) 1000 x 14 = 14000cm³
d) 1800 cm³
ii) Lung is reaching full capacity so can hardly expand anymore than that however hard the muscles try
e) Respiration uses O₂ and produces CO₂

8.a) Hepatic portal vein and hepatic artery in, the hepatic vein away
b)i) Bile
ii) Emulsification of fats
This gives a greater surface area for the enzyme lipase to act on the fat
c) glycogen is probably the most obvious

9. a) The sucli and gyri (ridges and grooves) of the cerebral cortex increases the surface area available for making connections
b) Allow information to pass between the 2 hemispheres of the cerebrum
c)i) autonomic
b)ii) The sympathetic division increases the heart rate by epinephrine/adrenaline (same thing) and norepnephrine/adrenaline (same thing) and parasympathetic division decreases HR by acetylcholine