21. Fig. 2-6
TECHNIQUE
Compounds including Incubators
radioactive tracer 1 2 3
(bright blue)
10 C 15 C 20 C
Human cells 4 5 6
25 C 30 C 35 C
1 Human
cells are 7 8 9
incubated 40 C 45 C 50 C
with compounds used to
make DNA. One compound is
labeled with 3H.
2 The cells are DNA (old and new)
placed in test
tubes; their DNA is
isolated; and
unused labeled
compounds are
removed.
3 The test tubes are placed in a scintillation counter.
RESULTS
Optimum
Counts per minute
30 temperature
for DNA
( 1,000)
20 synthesis
10
0
10 20 30 40 50
Temperature (ºC)
22. Fig. 2-6a
TECHNIQUE
Compounds including Incubators
radioactive tracer 1 2 3
(bright blue) 10ºC 15ºC 20ºC
Human 4 5 6
cells
25ºC 30ºC 35ºC
1 Human
cells are 7 8 9
incubated 40ºC 45ºC 50ºC
with compounds used to
make DNA. One compound is
labeled with 3H.
2 The cells are DNA (old and new)
placed in test
tubes; their DNA is
isolated; and
unused labeled
compounds are
removed.
23. Fig. 2-6b
TECHNIQUE
3 The test tubes are placed in a scintillation counter.
24. Fig. 2-6c
RESULTS
Counts per minute
Optimum
30 temperature
( 1,000)
for DNA
20 synthesis
10
0
10 20 30 40 50
Temperature (ºC)
27. Fig. 2-8
(a) A ball bouncing down a flight
of stairs provides an analogy
for energy levels of electrons
Third shell (highest energy
level)
Second shell (higher Energy
energy level) absorbed
First shell (lowest energy
level)
Energy
lost
Atomic
nucleus
(b)
36. Fig. 2-12a
Name and Electron- Lewis Dot Space-
Molecular distribution Structure and filling
Formula Diagram Structural Model
Formula
(a) Hydrogen (H2)
37. Fig. 2-12b
Name and Electron- Lewis Dot Space-
Molecular distribution Structure and filling
Formula Diagram Structural Model
Formula
(b) Oxygen (O2)
38. Fig. 2-12c
Name and Electron- Lewis Dot Space-
Molecular distribution Structure and filling
Formula Diagram Structural Model
Formula
(c) Water (H2O)
39. Fig. 2-12d
Name and Electron- Lewis Dot Space-
Molecular distribution Structure and filling
Formula Diagram Structural Model
Formula
(d) Methane
(CH4)