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Summary Unit One: Biological Molecules

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This covers the whole of Unit One: Biological Molecules within the Biology AQA A-Level. If you have any questions, just message :)

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¥
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water molecules ; CARD HYDRATE 's
Draw a
displayed water molecule
diagram monomers which make up carbohydrates are called monosaccharides



covalent bonds
s
They are formed from Carbon ,
Hydrogen and
Oxygen
s
-





O
S
example =

glucose
> CGHIZOG
-



St
o
H



H H
- St
St -
-

7 alpha
'


glucose
H


bon§
- .



St


You
Hydrogen need to be able to draw this from
memory

As oxygen has free electrons , It pushes the
hydrogen molecules GCHZOH


H 5C O
Closer
together , due to the free electrons
repelling strongly . H




POLAR MOLECULE =
One side of the molecule has a higher positive charge 4C OH H 1C



HYDROGEN BONDS =
The bonds are weak but keep the H2O as a
liquid .
HO 3C 2C OH




H HO




drivers mobsters bet
glucose
m o n o m e rs t
,
2 .
a




MONOMERS =
Small units of On beta CI
which
larger molecules are formed from
glucose ,
the
hydrogen and
hydroxide are reversed on




DIMERS =
TWO monomers
conveniently bonded H HO

/




' SOMER
POLYMERS 7C
Many
=
7C
monomers joined
together

OH H



A condensation reaction Joins monomber with the addition
together


Of a water molecule produced .




Ho - -

OH Ho - -

oh
-

Ee # Aa Ppk Ee DdkAa§BAa ;
n




s -


IDO monomer


a.
t
HO - -
O - -
O - -
O - -

OH
-
dimer
p
-
A
hydrolysis reaction is the opposite ,
it breaks the chemical bond
polymer


between the molecules and
requires H2O instead of
producing H2O

, r.ee#EhEon.*i*EEhEn*o.o*uEa *
qq.io#qggs**e**h.k.aae*hEeess
DISACCHARIDES
"


polysaccharides


Joined by a
glycosidic bond Polysaccharides are
polymers made of carbohydrates

formed from a condensation reaction



7. GLYCOGEN

OUEST ION i What disaccharide will be formed ? Stored of alpha glucose in animal cells




GCHZOH GCHZOH Glucose can then be released for respiration
l l
H 5C O H H 5C O H

✓ / Very branched =
Compact , a lot can fit in a small space

4C OHH 7C t 4C OHH 7C

/ /
Insoluble =
Doesn't affect water potential
HO 3C 27 OH HO 3C 27 OH



As
HOH HOH it is
very branched ,
lots of room for enzyme activity

condensation reaction Made of unstructured alpha glucose




(
" " 20 " " "" ° "
Glucose cos 'D "
J
-

a


H 5C O H H 5C O H T BONDS


/ r
4C OH H 7C 4C OH H 7C

\ \ OH
O
HO 3C 2C 3C 2C




(
(
l l
H Ho H Ho 2 .
STARCH
-
mm




HIe@yrezmooIeqf.p
-


there not much difference between starch and
is
glucose

Glycosidic bond ALWAYS forms bet we , Hellcat =
Compact , a lot can
fit in a small space




Insoluble =
Doesn't affect water potential


Maltose >
The
Large big
=
a. alpha glucose t alpha glucose molecule is too to leave the cell



b Sucrose >
alpha glucose fructose
\
. t




C .
Lactose >
glucose tgiactose
Both also 3 . CELLULOSE
-
Debate overt which
type monosaccharides Cellulose is made of beta glucose with
every other one
flipped


Composed of
long straight
,
chains



Linked
Hydrolysis of disaccharides can also occur .
by hydrogen bonds to form fibrils

The Provides
enzymes maltase , lactase and sucrase must be present
strength
HYDROGEN
BONDS
to the
hydrolysis disaccharides above
during digestion
-
occurs ~




iii.it
'

'

[
Mlcrotibril
glycosidic
→ → cellulose
fibril
bonds

, A Ml n 0 a CI d s i sheetmetal ;


The monomers of proteins are cimmino acids A protein is a
polypeptide chain of amino acids



They will
always contain
Hydrogen , carbon ,
oxygen and
Nitrogen

There are around 20
naturally occurring amino acids .
I .
① ⑦ OLD

H O




)
N H C




(
V

H C OH
carboxyl A
primary structure is a
sequence chain of amino acids


v group
A- MIME R GROUP '
found
group on ribosomes



This is the
section that will
change
>
folded in the
rough endoplasmic reti Clum




example =
The R
group for LYSINE is CHzCHzCH2CHzNHz


Whereas the R
group for SY STEINE is CHZSH


H o
2 .
808000000
it
N c



Sulphur Once the structure formed structure can be
H c at
primary
is , a
secondary

g¥ # formed in the shape of A Helix or I
} pleated sheets




i
is :

! ! !!
,

7.7 MONOMER =
One acid I boris
ndrogen
amino


i
x
µ , g

/
2 . DIPEPTIDE =
Two amino acids 1 I '
,
)
! , ↳ Peptide bonds
i

'
3. POLYPEPTIDE =

Multiple amino acids -




Amino acids are Joined via a
peptide bond in a condensation reaction



H o H o 3 .
080080000
N H c N H c After secondary ,
the structure can fold for a third time .




l l

H C C OH -
-




( §µzogy
y - - - - - --
T

! L!
R R Peptide THE ADDITIONAL BONDS

\
, ,
y
µ, gonna, page,

v i i


µ
PEPTIDE BOND i
off of THE R GROUP
-
.
.
, .
.




v
/
hydrogen
-
-

, ypaaohhe.EE#r
Y U Iv ( I / IN
"

:
As stated chains of
previously proteins are
polypeptides long amino
-




There
acids .

They can have multiple structures
by continuing to fold on the are
many different proteins in the
body , all with different shapes



REF >
for
Secondary Tertiary Quaternary
> and Jobs the
.
example ;
Primary
>
.
, top four are




QUATERNARY =
Multiple polypeptide chains bonded a .
Enzymes

to protein b Antibodies
together form a .




c. Transport proteins

bonds present j d . Structural proteins


Once have
the
polypeptides folded to form a
tertiary structure ,



bonds formed based off the R To most be divided into two separate categories
new are amino acids
group .
simplty , proteins can ;


fibrous and globular .




7 . I O n I C



The formation of bonds based off of attractions between
fibrous globulous
negative and positive charges on the R
groups .
Long and narrow Round spherical

Structural purpose functional purpose


2 d l S U l f I Cl e b r i d e s Less sensitive to
changes More sensitive to
changes
g
.




Disulfide bridges are formed when two molecules of the amino in pH and temperature in pH and temperature


acid
cysteine come within close contact -
The sulfur present Insoluble Soluble


in the R
group causes the bonds to be formed .
EXAMPLES =
( on egan EXAMPLES =

Enzymes
and
mycosis and
haemoglobin

3 .

hydrophobic interactions


These bonds are formed between the polar and non -

polar


sections of the molecule .




POLAR distribution of
charge
"
=
molecules with an uneven




NONPOLAR =
WITHOUT dipole dipole interactions
Symetrical molecule -
A




for the stop
malority of proteins , they folding at a
tertiary structure



but a few molecules such as
haemoglobin continue onwards

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Uploaded on
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File latest updated on
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Number of pages
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Written in
2020/2021
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