FMB - Lecture 2 Flashcards
CELL THEORY
- All organisms are made up of one or more cells.
- Cells are the basic unit of structure and organization that perform life functions.
- All cells derived from pre-existing cells.
The ___________ grew out of the work of many scientists and improvements in the microscope. Many scientist contributed to this.
Cell Theory
First to see cells (corks cells) in a microscope.
Robert Hooke
First to see organisms moving in pond water he place under microscope (animalcules).
Anton Van Leeuwenhoek
1838 - Concluded all plants were made of cells.
Matthias Schleiden
1839 - Concluded all animals are made up of cells.
Theodor Schwann
1855 - New cells can only be produced from the division of existing cells. This completed the 3rd statement of the new “Cell Theory” of life.
Rudolf Virchow
________ small unit which exhibits all the characteristics of life.
Cell
Basic structural, functional, and biological unit of all known organism.
Cell
Functions of Cell
- Basic unit of life.
- Synthesis molecules.
- Communication.
- Cell metabolism and energy use.
- Reproduction and inheritance of (DNA).
French Biologist that first distinguish prokaryote and eukaryote 1937.
Edouard Chatton
Prenucleus
Prokaryote
True nucleus
Eukaryote
Three Domains of Life by Carl Woese
Archaea, Bacteria, Eukarya
SIZE
Average size.
- 0.2 - 2.0 micrometer in diameter.
- 2 - 8 micrometer in length.
SHAPE
Basic shape.
- Spherical coccus
- Rod-shaped bacillus
- Spiral shaped
- Vibrio - comma shaped
- Sprillum - wavy shaped
- Spirochetes - cork screw shaped
_____ are much smaller that eukaryortic cells.
Bacteria
Shape of the bacterium is determined by _______.
Heredity
ARRANGEMENTS
Pairs
- Diplococci
- Diplobacilli
ARRANGEMENTS
Chains
- Streptococci
- Streptobacilli
ARRANGEMENTS
Clusters
- Tedrad
- Sarcinae
- Staphylococci
The substances that surrounds the cell. It is viscous and gelatinous polymer that contains polysaccharides and polypeptide.
Glycocalix
It is outside the cell wall and can protect cell against dehydration. It’s viscosity may inhibit the movement of nutrients out of the cell.
Glycocalix
If the substances is organized and firmly attached to the cell wall and can be seen through negative staining.
Capsule
Unorganized and unattached. The source of nutrition and is also a biofilm.
Slime layer
Degree of a pathogen that cause disease.
Bacterial Virulence
Capsule also prevent phagocytosis.
glycocalix
Protect, facilitate, and enables the cell to survive.
Extracellular polymeric substance.
This is located outside the cell wall. Half of the know bacteria are motile and capable of movement because of this.
Flagella
Three basic parts of Flagella.
- Filament
- Hook
- Basal body
Constant in diameter. Contains flagellin (protein) arranged in several chains that intertwined and form a helix around a hollow core.
Filament
Support the filament and the basal body.
Hook
Anchor flagella in the cell wall and plasma membrane.
Basal Body
Contains single flagella.
Monotrichous
Both side of the bacteria have flagella
Amphitrichous
Tough of flagella from one pole.
Lophotrichous
Flagella is distributed on the entire cell.
Peritrichous
Bacteria that lacks flagella and no projections.
Atrichous
The ability of an organism to move by or by itself.
Motility
One direction or smooth movement of bacteria.
Swim or run
Interrupted change of direction.
Tumble
Advantage of motility.
It enables the bacteria to move towards a favorable environment or away from an adverse one.
Function of motility.
Rotate flagella to run or tumble.
The movement of a bacterium towards or away a particular stimulus.
Taxis
Four types of taxis.
- Chemicals
- Light
- Attractant / +
- Repellent / -
Stimuli taxis of chemicals.
Chemotaxis
Stimuli taxis of light.
Phototaxis
Flagellar proteins.
H-antigens
Useful for distinguishing among serovars within a species of gram-negative bacteria.
H-antigens
This chemotactic signal will go towards the stimulus.
Attractant
This chemotactic signal will tumble away from the stimulus.
Repellent
Motility structure of and archaean.
Archaella
Consist of glycoproteins
Archaellins
These are bacteria that have unique structure and motility because the move through axial filament.
Spirochetes
Other term for axial filament.
Endoflagella
Bundles of fibrils that arise at the ends of a cells beneath an outer sheet and spiral around the cell. (Anchored at one end of the cell.)
Endoflagella
Rotation causes cell to move. The type of movement is similar to the way a cork screw moves through a cork.
Axial filament
Use for attachment. Tiny hollow projections as they are used to attached bacteria to surfaces. It also does not involve movements.
Pili
Pili is composed of _____ that is subunit of proteins.
Pilin
Two kinds of Pili.
- Conjugation Pili or Sex Pili or F Pili
- Attachment Pili or Fimbriae
Can be found only in certain groups of bacteria. It attached two cells and responsible for the transfer of genetic materials.
Conjugation Pili
This help bacteria adhere to surface like cell surface. Could also contribute to the pathogenecity of certain bacteria.
Fimbriae