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Bacterial morphology deals Bacterial morphology deals primarily with how the primarily with how the bacteria are shaped and how bacteria are shaped and how they are grouped together.they are grouped together.

CocciCocci - round - round bacterial cells. bacterial cells.

BacilliBacilli - rod- - rod-shaped bacterial shaped bacterial cells. cells.

SpirilliSpirilli - spiral- - spiral-shaped bacterial shaped bacterial cells.cells.

diplodiplo - - a prefix used a prefix used with the shape name with the shape name to indicate pairing of to indicate pairing of cells.cells.

streptostrepto - a prefix - a prefix used with the shape used with the shape name to indicate name to indicate filaments. filaments.

staphylostaphylo - - a prefix a prefix used with the shape used with the shape name to indicate name to indicate clusters.clusters.

What are some other things that help you to identify a bacteria?

Cell WallCell Wall – gives the bacteria its shape;

FlagellaFlagella – allows bacteria to move from place to place (only in some);

EndosporeEndospore – think of it like a bacteria “seed” (only in some bacillus)

Viral Structure

•DNA or RNA core surrounded by protein shell called capsid

•Some form a lipid rich covering around the capsid called the envelope

•Envelope may have spikes to help chemically recognize & attach to the host cell

•Shape determined by the capsid

HelicalHelical Consist of nucleic Consist of nucleic acid surrounded acid surrounded by by a hollow protein a hollow protein cylinder or capsid cylinder or capsid and possessing a and possessing a helical (twisted) helical (twisted) structure.structure.

Tobacco mosaic Tobacco mosaic virusvirus

PolyhedralPolyhedral consist of nucleic consist of nucleic acid acid surrounded by a surrounded by a polyhedral polyhedral (many-sided) (many-sided) shell or capsid.shell or capsid.

AdenovirusAdenovirus

Respiratory Respiratory InfectionsInfections

EnvelopedEnveloped

consist of consist of nucleic nucleic acid surrounded acid surrounded by either by either a helical or a helical or polyhedral core polyhedral core and covered by and covered by an envelope.an envelope.

Influenza AInfluenza A

FluFlu

Binal (complex) have neither helical nor polyhedral forms, are irregular shaped, or have complex structures

T4 T4 BacteriophageBacteriophage

Infect bacteriaInfect bacteria