Scientific Theory

Foundations of the theory: a proposed explanation of a pattern

In nature to rise that explanation is usually in the sciences, is called a hypothesis. Has to be tested over and over 1665- Hooked cut cork In half, began looking at “cells” began looking at little packaged parts. 1673- Leuwenhoek 1838- Schlemiel, botanist all things are composed of cells 1839- Schuman, physiologist 1858- Overthrow, physician next big thing, came to the conclusion that cells didn’t appear but they came from previously existing cells The ‘Initial’ Cell Theory all organisms are composed of one or more cells The cell is the basic unit of life

All cells are produced by the division of preexisting cells Modern Cell theory cells are basically the same In chemical composition and metabolic activities. All basic chemical and physiological functions are carried out inside the cells. Cell functions depend on the activities of subculture structures within the cell The cell contains hereditary Information (DNA) that Is passed cell to cell during cell division.

Groups of Organisms Domains Kingdoms Bacteria+Archie moaner 0 prokaryote Eukaryote D Prosiest, Fungi, Plantar, Animal C] eukaryote Characteristics of Kingdoms Moaner prokaryote, bacteria + Archie Prosiest verse collection of groups If cell wall- carbohydrate cellulose Heterocyclic or atrophic atrophic refers to feeding, auto meaning self feeding, heterocyclic means, has to get Its own food. Nil- or multicultural Fungi all heterocyclic complete lack of flagella cell wall of chitin contains nitrogen, also In bugs plantar all atrophic 1 OFF all multicultural.

Animal no cell walls Heterocyclic prokaryote cells plasma membrane = cell membrane made of lipid and protein controls what enters and leaves site of enzyme activity cell wall protects cell little control over what enters carbohydrate DNA hereditary material intros cell functions bacterial chromosomes different form eukaryote chromosomes usually circular associated proteins not like eukaryote histories small circular “accessory’ chromosomes = plastics cytoplasm mostly water enzymes salts, sugars, nucleotides, amino acids ATOP- energy source ribosome protein and RNA RNA composed of protein and protein factory 70 S (Speeders units) Speeders units??

Measure of sedimentation (sinking) rate depends on size and density density- gradient centrifugation Cesium chloride (CLC) functions of cytoplasm solvent mixing cytoplasm streaming allows reactants to interact inflates cell legume motor embedded in plasma membrane whipping motion as motor turns many bacteria produces “run and tumble” movement.

Atrophic prokaryote features of heterodox and Ayatollahs concentric, peripheral membranes photosynthetic machinery embedded membrane surrounds a tube eukaryotic cell structure and functions major organelles plasma membrane made of pillowslips fluid of the cell excluding the bound items costly vacuoles membrane bound structures that serve different functions nucleus two layers of membrane nuclear cores nucleolus high concentration of RNA and small and large ribosome subunits,