Entrance Test For Biotechnology Page 15
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2391.
C
h as
a
h alf-‐life
o f
5 730
y ears
h ow
m any
g rams
o f
a
4 .0
g
s ample
w ould
b e
l eft
a fter
14
3 .5
h alf-‐lives?
a) 1
g
b) 0.50
g
c) 0.38
g
d) 0.35
g
92.
I n
w hich
o ne
o f
t he
f ollowing
t ypes
o f
m icroscopy
i s
t he
s pecimen
s hadowed
w ith
h eavy
m etal?
a) atomic
f orce
m icroscopy
b) SEM
c) TEM
d) X-‐ray
d iffraction
93.
A ll
o f
t he
f ollowing
a re
t rue
o f
s upercoiling
i n
c hromosomal
D NA
E XCEPT:
a) DNA
d oubles
b ack
a nd
t wists
u pon
i tself.
b) In
b acteria
a nd
e ukaryotic
c ells,
t here
i s
p ositive
s upercoiling.
c) It
i s
m aintained
b y
D NA-‐binding
p roteins
a nd
r esults
i n
c ompaction
d) It
i s
g enerated
b y
g yrase.
94.
W hich
o f
t he
f ollowing
s tatements
i s
f alse
a bout
t he
E .
c oli
p hosphotransferase
s ystem
( PTS)?
a) The
E nzI
c omplex
i n
t he
c ytoplasm
i s
s hared
b etween
a ll
P TS
t ransporters.
b) The
E nzII
c omplex
i s
s pecific
t o
t he
s ugar
b eing
t ransported.
c) The
p hosphate
g roup
t ransferred
t o
t he
s ugar
c omes
f rom
phosphoenolpyruvate.
d) The
P TS
t ransport
r equires
e nergy
i n
t he
f orm
o f
A TP.
95.
A
c afeteria
w orker
w ho
f ails
t o
w ash
h is
h ands
t horoughly
a nd
f ails
t o
w ear
g loves
inoculates
a
q uiche
w ith
4
E .
c oli
w hen
h e
u ses
h is
f inger
t o
t est
w hether
i t
i s
d one.
By
t he
t ime
y ou
p urchase
t he
q uiche,
t here
a re
1 28
E .
c oli
c ells
i n
i t.
H ow
m any
generations
d id
t he
c ells
g o
t hrough?
a) 4
b) 5
c) 8
d) 32
96.
A
n ull
e vent
i s
a) a
r esult
o f
m ore
t han
t wo
s ample
p oints
b) a
r esult
w ith
e ither
y es
o r
n o
s ample
p oint
c) a
r esult
w ith
o nly
o ne
s ample
p oint
d) a
r esult
w ith
n o
s ample
p oint
97.
A
D NA
s egment
h as
1 0
b ase
p airs.
H ow
m any
d ifferent
s equences
a re
p ossible?
a) 4,000
b) 40,000
c) 4,00,000
d) More
t han
a
m illion
15
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