Biology Teaching

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Mitosis at a glance

T2 Bacteriophage-
The T2 phage is a classic example of a complex virus. It is relatively large for a virus and possesses the iconic "lunar lander" shape:
Head (Capsid): An elongated icosahedral head made entirely of protein. Packed tightly inside this head is a single molecule of linear, double-stranded DNA (dsDNA).
Tail: A hollow cylinder surrounded by a contractile sheath. When the virus infects a cell, this sheath contracts like a piston to punch through the bacterial cell wall.
Baseplate and Tail Fibers: Located at the bottom of the tail. The 6 long tail fibers act as sensors, recognizing specific lipopolysaccharide receptors on the surface of E. coli.

Endoparasite and exoparasite

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Biological Classification (Summary)
This chapter deals with how living organisms are classified based on their characteristics and evolutionary relationships.
1. Five Kingdom Classification (R.H. Whittaker):
Organisms are divided into five kingdoms:
Monera – Prokaryotic, unicellular (e.g., bacteria, cyanobacteria)
Protista – Unicellular eukaryotes (e.g., Amoeba, Euglena)
Fungi – Heterotrophic, decomposers (e.g., yeast, mushrooms)
Plantae – Autotrophic, photosynthetic (e.g., plants)
Animalia – Multicellular, heterotrophic (e.g., humans, animals)
2. Basis of Classification:
Cell structure (prokaryotic/eukaryotic)
Body organization (unicellular/multicellular)
Mode of nutrition (autotrophic/heterotrophic)
Reproduction
Phylogenetic relationships
3. Kingdom Monera:
Includes bacteria and cyanobacteria
Can be autotrophic or heterotrophic
Reproduce mainly by binary fission
4. Kingdom Protista:
Mostly aquatic
Includes protozoans, algae, and slime molds
Some are photosynthetic, others are heterotrophic
5. Kingdom Fungi:
Heterotrophic (saprophytic/parasitic)
Cell wall made of chitin
Reproduce by spores
6. Viruses, Viroids, Lichens:
Viruses – Non-cellular, require host for reproduction
Viroids – Infectious RNA particles
Lichens – Symbiotic association of algae and fungi
Conclusion:
Biological classification helps in understanding diversity, relationships, and evolution of organisms.

Phylum protozoa