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How did scientists come up with the term VIRUS?
In the 1890s, two scientists independently investigate the cause of the disease.
How did scientists come up with the term VIRUS?
The scientists extracted sap from unhealthy leaves and put it on the leaves of normal, healthy plants
How did scientists come up with the term VIRUS?
They filtered the sap to remove bacteria and then repeated the tests.
How did scientists come up with the term VIRUS?
Their conclusion was that something smaller than bacteria were causing the disease.
If viruses are smaller than bacteria, how big do you think they are?
PREFIX SYMBOL FACTORyotta Y 1024
zetta Z 1021
exa E 1018
peta P 1015
tera T 1012
giga G 109
mega M 106
kilo k 103
hecto h 102
deka da 101
deci d 10-1
centi c 10-2
milli m 10-3
micro µ 10-6
nano n 10-9
pico p 10-12
femto f 10-15
atto a 10-18
zepto z 10-21
yocto y 10-24
What are the main components of a virus?
Viruses are simple agents
Capsid – Protein Shell
Nucleic Acid Core
Envelope –Outer Membrane
Surface Receptors
Capsids
PROTEINS
IsoleucineIle, I
Asparagine, Asn, N
Serine, Ser, S
Proline, Pro, P
Glutamic acid, Glu, E
Threonine, Thr, T
Amino Acids
Capsid
Head
Tail sheath
DNA
T4 Bacteriophage Tobacco Mosaic Virus
Influenza Virus
RNA
Tail fiber
RNA
Capsid proteins
Surface proteins