100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached 4.2 TrustPilot
logo-home
Summary

Summary The entire AQA A-level biology specification for topic, 5 energy transfers

Rating
-
Sold
-
Pages
1
Uploaded on
12-07-2024
Written in
2023/2024

I meticulously created these AQA A-level Biology notes during my studies, and they helped me achieve an A*. Organised according to the 8-unit specification, each unit has its own dedicated A4 page with all relevant information, making your study sessions streamlined and efficient. Within each unit, sub-units further break down the content, ensuring comprehensive coverage. These notes aren't just thorough; they're also visually engaging, featuring colourful images and diagrams to enhance understanding. They even include extra specification points to help with the paper 3 essay. Perfect for anyone currently studying or about to start A-level Biology, these notes are a must-have if you aim for top grades. Get your copy now and set yourself up for success!

Show more Read less








Whoops! We can’t load your doc right now. Try again or contact support.

Document information

Uploaded on
July 12, 2024
Number of pages
1
Written in
2023/2024
Type
Summary

Subjects

Content preview

&




le ⑬
Energy Infer Organisms
S
SECTION
in
total
mass




uses light energy to make Alp that's used +guezerlorganic
PHOTOSYNTHESIS ENERGY + ECOSYSTEMS
measureinthemas a e




Damageaed
·
energy + 6C0, + GH CO (4 200 ,
+ 60c

Photosynmeipigmentsar mechaabsorb photons and
· can absorb a
range it




i
,



at
labsorb the least)
·
pigments are different colours
due to the
light they reflect , having a range of
pigments allows plants to absorb more 1 of light >
- more GPP : more .
energy is captured
cuTm you
production is me chemical also avalible

grossprimary
store in for plant
GPP energy plant biomasns e
photosynthetipigmentsanarrangedintophotosystems
=
a
funnel shaped s t u t e o
that
·
are
ureproducinasses
·




·
respirator
NPP = net
primary production is the chemical
energy stone in plant biomass after recalt respiratory
occurs on the
integranal membrane
Losses to environment factored i n UPP = GPP-R - N
losses
I (F + R)
(
= -




'chemical energyaesed
photophospayaof


opensee-ni
6 PSI e Nom ETC 4
+ food
?
ions fom chemiosmosis are used to how is
energy transferred through each trophic level
plants synmesize
reduce
NADD(Coenzyme) reduced NADP .

food chains as
organiccompounds

I -
S u n is
the the ultimate source of energy in most
<
aquaria 102
6
trap sun's energy in photosynmesis

chicropropyl
2 producers
light
-



lineor direction


·
-ATB energy transferred from producers > consumers in 1 -



recycled in nutrient &
-




S E carotenes a l energy cost is dissipated by heat (biomass)
+



-
NADP respiratory losses
-

energy lost in consumers from feacal +




NAD
I ETR to
swoma -
I
- no .trophic levels = Limited be not enough biomass/energy
, not enough

synmanChorophylalantrophyll
carotenes
S Sustain a viable population size
.

3
-
ze-

used
sugarssynmesebypantsar respiratorysubstrate
mas
i Biomass-most
10)

chain
Election
mass is used as wet mass varies too much
transport Chemiosmosis is
=
dry
the movement of many = chemical energy stored in dry biomass estimated by Calorimetry
.
(ETC)
HisHom ↓ burnti npur computecombustionown
mass
dry biosa s



mylanoiumen ④ ⑤
+
ADD + Pi -
a sing
ATP
·


·
calc
15 need
energy
to
in sample
raise 11g
15)
of 120 by 0 . 24 "c


120 24 + + 202 H
in farming practices
H
Productivity
+
- Ht
Chemiosmosis
Photolysis H+ herbicides + pesticides) to r energy losses to non-human food chains
Ht4 simply rying foodwebbs (usingmovement and neat loss) within a human food chain
--
* -




3 s chemiosmos is ↓ respiratory cosses (restricting .
lost in faces
2 redox reactions >
Nutritive foods that are easily digested. more energy absorbed
photolysis
-




spls Chlorophyll's e-release of M
+
ions via ATP
releases
high
(photons H
+
) energy in ETC synthase energy avaliable after wanster CST/m2
efficiency ,
m
=
to combine percentage =
100 q =
energy
energy avariable before transfer t
↳ energy -
pump ut ions from App + Di-ATP
shoma-tylavoid wmen
(non-cyclic
: proton gradient set up
Phosphorylation)
.



Y




it's known as Calvin C'Y ,
- the calvin cycle detected chemical steps
NUTRIENT CYCLES
as used
Co2 the radioactive .




LIR/CALVIN CYCLE biochemical reaction series
- occurs in me stoma
>
-

6CO2 Con 200
using Light
- .
,




1 Co reacts with RuBp to form 2 molecules of JP in a
carboxylation reaction catalysed rubisco
recycled
:
, nutrients are within natural ecosystems as
they have a finite number , exemplifed by
.
2 ATP and reduced NADP from LDR are used to reduce > hiose
GP- phosphate
hirrogen
the and phosphorus .
cycle
some nicephosphate isuedregenerat Rupin Cavinuelguecore , amino-acids , lipis s
·

microrganisms play a viral role in
recycling chemical elements (P +
N2)
2 SAPROBIONTS
- · needed for ammonification
LIMITING FACTORS OF PHOTOSYNTHESIS THE NITROGEN CYCLE ⑤ BACTERIA discoves ↳> decompose N-containing molees
is
·

Light if t more chlorophyll e are excited in LDR - NADPH + ATP used in LR-guecose faster
intensity :
·




yayliving thingsneed
is
to prin ·
Nitrogen fixation =
N2 -NH
+ NHI inwine acssaprobin
inSoils/Symbioticpantrnou,a
to use a
growth more TP + GP However may cause chlorophyll to overheat. , . 18%.
Atmosphere NIN tree
·
secrete enzymes onto food source




in
·
Temperature : ↑ enzymes + substrates have KE -ESC's more RuBP-> GP-TP : faster
, gluecose at high ~
·
molecules digested extracularly
emperatures enzymes denaue manspiration rates ↑ : plants Wilt : Cloel Stomata bC too big
- .
Nirirication Lotidation N
. ·

·
somble products lal absorbed +



coconcentration:ittratboyaonRuBpTp
+ opt : guecost above o u e
Stomat e
digested amino group NHz reloved
· aerobic conditions bacteria thrives >
-



~



denimificationMauioNN S
T
MYCORRMI
increase
ploughing
Limiting factors
inshtesuptaminatoristenposysistara
:
- ·

symbiotic relationship between plant

&
mem ammonification" saprobionts in sail, in waterlogged soil
assymilation
roots fungi
and
in reads /hypheal ↓ sa roots
activeport Lungal
·




& plant
animatins consuming proteins L improves uptane of NOj by At
·




· Astemperaiwerespiration,pinwhee rateascompensationpointstation tungi gain glucese for R from plant. .



.

·
what rate
of photosynthesis exceeds respiration plant uses ATP faster than it's produced PHOSPHOROUS CYCLE EUTROPHICATION


Ferrisersarenighlysoublorganiciopprtviscanbenawai
a

or J




E :NAD
TOTAL :
·
posions
sedimentation
inredimentary
erosion +
rock

fertilisers 3-algoa l take up ions+ use them to e protein StDNA Divide .
rapidly >
-
algal bloom Populationa
dissolve light
block
4
algae X
submerged plants from photosynthesis
E

winan
by owe factors
2 FAB Po? ions in 4201 soils




I
x
food sources for saprobiotic bacteria in 120 multiply
·

S-ded plants are -

ATPInet) or X6 ATP (gross) absorption , assimilation bacteria respire anerobically > use up 02
x 4 O saprobiotic




·
· -
-


by ATP using micorrhizal
LIGHT INTENSITY
~ 7 -
water contains little O2 fish , other aerobic animals dis as they need
O, to respire fish
hil,




consumption +
digestion
I re-assimilarion

RESPIRATION isms
bowhichenegyis add
a
-me
~ rate
:
produces ATD -Pyruvate ononly be converted o editions to me
i n the form of biomass .




anerobic + areobic respiration starts
here , anerobic process
How do fertilisers ↑ productivity
& Fertilisers contain nutrients like nitrates +
FERTILISERS
·




GLUCOSE6 G LYCOLYSIS =
Cytoplasm , phosphates that are in short supply
carbon based it Manure , bone meal , slurry
-
·
natural fertilisers (organic) : .
i
·
fertilisers needed for DNA , aa , protein + ATP

2D i
·
Artificial fertilisers (inorganic :
produced in labs , mined from rocks + blended -
synmesis
2ATP 2ADP +
Phosphorylation
-
of guecose
- 1 mixture of nulrients (NPH) ·
fertilisers needed for cen division (6 , 5 . 62)

Glucose BISPHOSPHATEGC ·
plants that obtain more nutrients more grow




I
ORGANIC ↓ NORGANIC
- and grow quicker
Splitting





.
2 · .. plants photosynthesize at faster rate >




I I
-



is clean chemicals that lach
3C
nutrientstplantsconta
· ·
more chlorophyll
3
TRIOSEPHOSPHATE
TRIOSEPHOSPHATE
odour of organic compounds ·
so ↑ spp + NPP !!
· adds structure to soil (humus) ·
Nutrients released in
rapidly
pDN
NAD - > NADH
3. oxidation/denyroge
-

is acetate
nurientsnotreadily
a · the soil

2 ATP + 2Pi > >
-
2ATP 2 A+ ·
nurrients in concentrated form
↳ Substrate level phosphorylation provides usenu means of applied in overusing fertilisers
. ·

V . ↓ amounts more consequences of
V
3 3 disposing was te
PYRUVATE - effective
PYRUVATE O ↓ species diversity
whiches , only some plants
. -



harsh/hostile environments
survive

·
can


I
difficult to spread -
↑ rish of euriphication
Activetransportotpyruvattoex
·




is slow
that -
>>
competition
outcompete others -


mineral release
readily reached from Soil
·



& europhiciation
teaching when it rains , duenuhients
2 lost from -



a s ·
expensive to
buy /
manufacture to 120 solubility
3 3 Soil
LINK REACTION not
rishfertiliserspray sprad
pyRUVATE pyRUVATE nurients r u n into waters - eutrophication
·
>



NADEE NE
ADAM
decarboy o n i s !
fer tilisers
combination of both give the best long ter m
productivity
2
V .
2 oxidation/dehydrogenation
ACETATE

1 CO A > I CO A > .
3 w ansport i
added to
Coenzyme
- -
. .

-




W W
2)
ACETYL COENZYMEAACETYL COENZYME A -




· i remains in Mitochondrial manix
KREBBS CYCLE
ACEIYL COENZYMEA ACEIYL OENZYME A
↓ 1. addition , 41 Chain

reacts with Actery


coenzyme
↓ A
Coenzyme .


A A
Coenzyme
4C TC 4C TC .
2 decarboxylation
~ ~
x3NAD x3NAD . Oxidation
3
FA App; F
SNAD App
reacios that
, 3NADH
copScumaucion
Y


Substrate
FADH
5 .
reduce Coenzymes
level
FAD +



phosphorylation
NAD


ATP


occurs in the
-
inner membrane
OXIDATION PHOSPHORYLATION of mitochond in



⑪ ACTIVE TRNASPORT ⑤ CHEMIOSMOSIS
② SPLITTING from Eic used
ut ions diffuse
energy m+
back down
Mc atm spi to AT M + ions into IMS S
gradinthrouga
·


to > - 4+
gradient
INTERMEMBRANE SPACE 24
+ synthase
Int 24
+




S
mana wi
NNERANE -ATP Synchase
OCATIONPHOSPHRET R
synthase to rotate ->
energy
>
-
ATB
+
Mari 2u

& OXEGEN IS THE TERMINAL
ELECTION ACCEPTORS
①RELASE ADP + Pi "ATP +
2
&

NADH releases notions 2n Mz0
+ +
=02 +

③ REDOX/ETC
elections pass down

a
strela
reactions



EXQ's : Without 02 , leSS ATP is released by respiration . Explain
8. is the terminal proton acceptor , so ETC can no
longer function ( f ) so all 34138
ATP molecules aren't made As only glycolysis would occur
only 2 ATD are >
. -




· Explain O2 is needed for me
production of ATP in the cristal
o is the terminal proton acceptor mat receives &from t h e ETC to form water
,
It
made from
diffusing down to
and enough energy ETC
phosphorylate .
ATD



Respiration
Anerobic

Short term
·

ANIMAL + YEAST +
BACTERIA PLANTS -
lactate > Lactic acid -



and emanol = toxic
4 ATP(6) LATP (6)
ATP produced
-
Small
-

2 ATPIN) ZATDIN) ·
GLYCISIS can still
2 NAD INAD occur by using
to re-
2 lac tale ~
2 CH ,2004 pyruvate
Acidise NADH-NAD
2202 -

S
c
OBLAOneltblood
·
:
Hermentation




OTHER RESIRATORY SUBSTANCES

ATP phosphocreatine system
· very qui ATP + creatine
a
: Per
runsuati tesen
·
f Lac tate
anerobic


organic biomol mat
respiratory substrate :


has the potentical chemical energy for
ATP production I

·

carbohydrates (glucose
riglycrides (faty acids + glycol
·
proteins (amino acids (
>
-
that can enter Krebbs cycle


-
£3.99
Get access to the full document:

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

Get to know the seller
Seller avatar
ck-w

Also available in package deal

Thumbnail
Package deal
The entire specification for AQA A-level biology
-
8 2024
£ 32.92 More info

Get to know the seller

Seller avatar
ck-w Newcastle University
View profile
Follow You need to be logged in order to follow users or courses
Sold
0
Member since
1 year
Number of followers
0
Documents
8
Last sold
-
A:A* A-level notes

0.0

0 reviews

5
0
4
0
3
0
2
0
1
0

Recently viewed by you

Why students choose Stuvia

Created by fellow students, verified by reviews

Quality you can trust: written by students who passed their exams and reviewed by others who've used these revision notes.

Didn't get what you expected? Choose another document

No problem! You can straightaway pick a different document that better suits what you're after.

Pay as you like, start learning straight away

No subscription, no commitments. Pay the way you're used to via credit card and download your PDF document instantly.

Student with book image

“Bought, downloaded, and smashed it. It really can be that simple.”

Alisha Student

Frequently asked questions