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Summary

Summary Biochemistry – Complete Study Notes (Amino Acids, Enzymes, Metabolism, Protein Structure) – Comprehensive Exam Material

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MCAT Biochemistry notes are designed to provide fast learning and long term retention for students. Whether you're just starting MCAT prep or brushing up before test day, these notes give you exactly what you need—clear explanations. These notes are crafted for premed students, by a premed student, focusing only on what the MCAT truly tests.

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Uploaded on
December 6, 2025
Number of pages
17
Written in
2024/2025
Type
Summary

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B branched sheet
Amino Acids : all are 2/(5) config.

Glycine G Valine V Isoleucine I
Anne
A ne -




TH3 TH3 TH3
⑪- - ⑰
- ⑭- -o
L



Proline P MethionineM NONDOLAR W Tyroprophan IP
-

TH3
TH3
TH- (HYDROPHOBIC)
Q-




-
C ⑪ --

-
, Leucine L ⑰
L
-




NH3




T
F Gamma
thenylalan
e
Branched



⑰ C-c-e
-




-
CAN FORMEDE BONDS
Sermine S
↑ C
Cysteine .
confi
TH3 Threonine Y -




TH3
-




⑰ -H TH3 Asparagine N
⑭- -SH
- ⑪- XoH THE N


GLN Glutamine Q
-




Ths o
-
O Tyrosine

TH3
Y

H -
-I
NH2 POLAR ⑪ -

-c
ko CHYDROPHILLIC) to
·

, (f)


I
D E
Aspartate o utamate
NH3

⑪ c - co ④- c c c
b
- - - -




" "
- -
d
↳sineK HRK

TH3 (t)
Q -

C-c-c-c-- B
- A
Arginine
-
R (HGHPI) S
TH3
I

- C


Histidine H
- >
-
phosphorylation
TH3


&
> Ketogenic
-

,site
arectedeness
f caster
1ry structure :



hydrolysistogether
Val / ASp1 Glu /HIS -PEPTIDEBOND
sub.cmsAt] ,
2ry structure :
[Nucleophilic cylEnergehcFavorable Stable : RESONANCE
Stabilization
CAMIDES)
208a-helix (Keratin) a partial double
- Hydrogen bond bond character
M Bpleated (fibroin) (blw AMIDE PROTONS +
CARBONYLOXYGEN)


zry structure "denaturation" :




ThyrophonyerpentropyspontaneS
n
care

Salt Bridges Con pair) -
> Vaw , hydrogen bond,
Disulfide S-S
louk bond




Si
ury structure :




↓↓ S . A
- > ** Stability
↓↓ amt of DNA coded

J
multmeric protein
.




↓ ↓ distance > ↑↑ speed -

faster
* cooperativity "multiple subunits


·
CONVALENT 2/ nucleophilic a d
occurs .
:

"Salman than can threat YOU"
serine , threonine , Cysteine , Tyrosine Lysine
,
S + C Yk

, cenzymatic reaction)
·
Entropic Penalty : unfavorable interacti .




denature : >
-
HYDROPHOBIC + HYDROPHILLIC
> Temp
-




- ↓ pH
eadd Concentrated chatropic
·
agent

Enzymes :




AFFECT GiBBs) -
> affect TEMP rxn9tEa
biological Catalyst (DON'T (a rate
ENZYMES : .
of


useofactors "transfer functional
1) Oxireductases >
- 2) Transferases -> Kinases group"
↳ Transaminatio
O
↓ =
Aminotransferases




I
cam of Loss of O
·
transfer of amino group- > Ketoad

Losso T GainOT
e- acceptor OXIDANT
= e-donor REDUCTANT
=
Glutamate
↳ minotransferases
-
keoglutation
NO 2 PRODUCTS
>
(Only 1)
-




3) Hydrolases 4) Lyases



- ·
· S
X +
H20ylases Rece upX
ind
-


breakdown
&
lipase , peptidase, nuclease, phosphatase
↳ ·
protease HYDROLYZE AMIDE
:



PROLASE
6) Ligases
BONDAme as
5) Isomerases
Addition (synthesis) reaction
x -X y -y
Constitutional somers DNALIgases ADNA
Steroomers




·
CONDENSATION :
LEAVE H20
·
HYDROLYSIS : CONSUME H2O
- -




i Endonuclease -> Cuts Within nucleic acid (entical for DNA repair)
I
Exonuclease -
> removes nucleotides (3-5)
D Ribonuclease -
>
degrades RNA (reverse transcription)

, rate limit t
vo-vo-m---man
chaels-Mentes



Step


Kmdating Umaxofenzymes turnover max
kat =
Etot
·
phosphorylated IS FASTER than Unphosphorylated


catalytic eff
= What binding affinity



Substrate affinity

#max
Keat &




Vmax[# of enzymes #induction
M
kmdanity #upregulat




enzymes
Uma
↑No
↑ Vmax


one
# activation
numb .
of
Potentiator!
&*
J HIGH Kat
CONTROL




-
affinity




i fo
S⑭ ↓↓ Vmax
High
] cow
Kcat
↓ ↓ numb. Of enzymes

repression
downregulation
desensitization
~
#
noncompetitive O
Vo Vmax
=
(ims)
low cat. effici .
Vo =

maxsa
&
[S]


Hill coeff .
>
-




Glysodic bond : Irrevesible ·
Of 1 NEGATIVE
* y Cooperativity
[convalent bond] ·
It POSITIVE
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