CHEMISTRY Y12
Option – Biochemistry of Movement
CLOZE PASSAGE No 4b
Enzymes
Complete the following sentences using appropriate words or short phrases
a) Enzymes are called biological ………………..
catalysts
b) All enzymes are …………………..
proteins
c) Enzymes are very …………………….as they catalyse one type of reaction
specific
d) Name an enzyme found in the stomach
Protease
e) The approx pH of the stomach is
3 to 4
f) Name the enzyme that forms junket
Renin
g) Name 2 variables that we changed in investigating the production of junket
Temp and pH
h) All enzymes will lower the ………………………………………
Activation energy
i)
All enzymes or proteins, if they lose their tertiary or secondary structure are said to
have been……………………..
denatured
j)
The general name of the substance an enzyme acts upon ?
substrate
k) The name of the model associated with enzyme action
Lock and Key
l)
The enzyme
Identify the key in the model
m) 2 common conditions that will denature enzymes
High temp and
varying pH
n) The site or location where the enzyme fits to the substrate
Active site
o) The name of the enzyme that will break phosphate away from ATP to produce ADP
ATPase
p)
Denaturing proteins is both a …………….. and …………….. change causing a loss of
biological activity
Physical and
chemical
q) Changing pH has a marked effect on what type of bonds
Ionic or electrostatic
r) What structure of the enzyme is not affected by denaturing
Primary structure
s) Name the substrate in our junket experiment
Milk protein
t) The variable that we change or alter in an experiment is called the …………. variable
Independent
u) What we measure in an experiment is called the ………………. variable
dependent
v) A variable that was kept constant in our junket experiment
w) Name one condition under which junket did not form
x) The ideal temp to produce junket is
y) The folded structure of a protein or enzyme is stabilised by what 4 types of bonds
z) Enzymes are a special class of ………….. with a ………….site that is ………specific
Vol of milk, amount
of renin added
Cold temp and high
pH
370C
Electostatic forces.
H bonds, disulfide
and hydrophobic
bonding
Proteins,binding or
active , substrate