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Biology 1010 - UNIT 3

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Attached are notes from unit 3 of Biology 1010. These cover lectures 3A-3D. The topics include DNA replication, structure, and enzyme catalysis.

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UNIT 3
BIOLOGY 1O 1

, Trates
science .

reacean

T

HERMODYNAMICS + KINETICS -
LECTURE 3A verganic enderganis
needed
spontaneous merg
^




Tot o
^




thurmadynamics , (ex
=>
the direction chemical reaction OGLO
cancer
proceeds spontaneous
:
a
deached
.



,

but ,
NOT the
speed the reactions
proceeds *
·

G50-enegyrequired) ~

Lindenberg explosion german ship
(20
century) Cyagen agen-water
: FAST REACTION

&
+
BOTH SPONTANEOUS

↳ rust (slaw ractions unless to maisture)
irautenggen
=
,
exposed neededs
sen
engame
· clumical reactions must always proceed through an Carrier




~ange
energy

Marie
^



system must achieve higher mergy state to complete
简武리 '

ex
spark needed to ignite spantaneaus eplasion
.




gruric spontaneaus reaction ractants praducts
-




: > OG < C


reactants
hall
passes through through higher eergy
transition state
Stumporary in process of breaking-bending/stitching
·



pass
tanes
a


achie
to during state often readants
hand is strutted
·


_
a
ey , bent (BROKEN BOND
a
H) ar = -
*

reactions slawed
being trapped in metastable state
_




by
·




G &
difference in energy between reactants products
·
+

Ea -G unulated + >


Ea delemmes how reaction
fast (even when
_




Spontanans) accus
·




·


products are mast stable
·
reactants are mitastable >
partly/tmpararily


~
HETASTABILITY YOkg
ATP
eaily life metastable + its
clumistry is

↑ is




a
huelysbeing
↳ cawbeatlireh
life is metastable ; the
equilibrium state
of s
human/Undenburg =
ASHES
fiitically by enzymes
↳ ~
crample : ☆ chemical reaction that accus

peptic every
Sfaveable)
hand is unstable (mater breaks hands <DG -Skcal/mol
·


peptide =
in
bolagy needs to havs D G10 + needs

half-time far reaction 7
large
to be
catalyzed by
·



Ea
:

years s an
eyye
slaw under the meld conditions
* all reactions a re
of life
= we
provide vatalysts that speed up just the beneficial reactions (LOWERS Ea-
different reaction path)
Lind to molecules
>
-
enzymes specific
:
sped up ther reaction wo/ each other +




thousands
↳ each
myyma catalyzes just I specific radiois alls have
ofsymes
↳ be turned an/
can
off ~

independently controlled rate


Thumadynaniscentral if reaction w/
hydrolysis
* : OG>0 is needed , it to
enzyme couples ATP
knitic contral: slaw reaction must speed
*
if accor
quickly ,
eyyme
used to
it
up .




fres energy
-
more is released the
further a reaction is
from equilibrim
-
lawce Carrier but impact
enzymes energy
do NOT
equllum
-
rates concentration increases until saturation
mygmatic increase as




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Uploaded on
April 19, 2026
Number of pages
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Written in
2025/2026
Type
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Professor(s)
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