Ch. 1 What is Biology?

In 1 : what is mology ?
ALIVE
S
key characteristics to be
Theory an explanation for
very general class
-

a


1
. cells~ must have membrane of phenomena or observations that are

.
2 Replication supported by a wide
body of evidence

.
3 Information 1) The Cell
Theory : what are
organisms made of
?
4 .


Energy
.
5 Evolution 1600's
Hooke -
discovered cells in cork tissue

Louis Fasteur Leeuwenhoek animacules
hypothesis
-




1 cells arise from cells

.
2 cells do not arise by spontaneous generation
· swan neck experiment




m =
meter No =
micrometer 1m = 108 am

cm = centimeter hm =
nanometer = 1, 000 mm


mm = millimeter = 1 000,000 Mm
,



1 000,000
,000 nm
-




,

1 cm = 10 Im =
01m
-
3
1 mm = 10 m = 001 m eX : 750 cm =
NM
1 Mm = 10. m = .
00000 im 750cm x 'm
x
1
,
000, 000 Nm

-
9
Inm = 10 m =
000000001 m 100 cm Im

.5
7 x 1, 000 000 =
7 500 000 NM
, , ,




Light Microscopy Electrom Microscopy
small as 200 beam of electrons rather than
light
·
can resolve structures as nm ·



·
requires stains or dyes to see clearly ·
can resolve smaller structure
,
down to . 2 nm


microscopy (SEM)
fluorescent markers Scanning Electron surface
· ·
-




Transmission Electron microscopy (TEML interior
· -




Micrograph-picture through a microscope