Cell Bio Unit 1 topic 1-B
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Scientist who used a simple microscope to examine a peice of cork and named the chambers "cells" even though they were cell walls left by the dead plants
Scientist who published paper that led to the birth of cellular biology in 1838 saying that plant and tissues were made of cells and that they came from pre-existing cells.
Scientist who published paper that led to the birth of cellular biology in 1839 saying that and animal tissues were made of cells and that they came from pre-existing cells.
1860s scientist that disproved spontaneous generation through experiments. Showed that life came from pre-existing life through the bent bottle neck experiment
Founder of the Theory of Evolution stateing that random variation and natural selection can drive the production fo organisms with novel features, adapted to new ways of life.
Theory of Evolution
Explains how diversity has arisen amoung organims that share a common anscetry.
a dense material often made of protein fibers embedded in a polysaccharide gel
can begin to distinguish and classify specific components in the cytoplams. structures smaller than .2 micrometers (about half the wavelength of light) can't be seen
Can't look at living specimens. Can see down to a few nm. Lots of preperation. Separates mess into organells (5nm) Some large molecules
transmission electron microscope
type of electron microscope that transmits a beam of electrons through the thinly scliced sample. (2nm)
Scanning electron microscope
Type of electron microscope that scatters electrons off the surface of the sample and so it is used to look at the surface details of cells and other structures (between 3 and 20 nm)
Uses florencent light to see 3D images
organisms whose cells have a nucleus
organisms whose cells don't have a nucleus
Characteristics of Procaryotes
Sherical, rodlike, or corkscrew in shape/ a few micrometers long/ tough protective coat(cell wall), surrounding the plasma membrane, which enloses the compartment containing the cytoplasm and DNA.
mitochondria / bacteria
organelle that generates engery in cell are thought to be evolved from aerobic(oxygen) bateria that took to living inside the anaearobic(no oxygen) ancestors of today's eucaryotic cells
organelle in plant cells that perform the photosynthesis are thought to be evolved from photosythetic bacteria that found homes inside the plant cell's cytoplasm
2 domains of procaryotes
archaea and bacteria
Domain Bacteria or Eubacteria
- the domain that most of the everyday bacteria are in
- cell walls, ell membrane, DNA w/o introns, ribosomes
- bacteria that in hostile enviroments like hot acid volcanic springs, and airless depths of mearine sediments
- Cell walls and membranes, DNA w/ introns, ribosomes
- Abundant in all habitats
- more closely related to eukaryotes than to bacteria
moving in a forward direction and asking questions based on what we learn
looking back on what we know and asking new questions to further science. As we learn we know enough to ask new questions
1660's cell discoveries
- Robert Hooke Discovered Cells
- 1670's Leeuwenhoek discovered freee living cells in pond water
1800's Cell Discoveries
- 1831 Robert Brown discovered the nucleus
- 1858 Ruldof Virchow aregued there is no spontaneous generation
- 1862 Louis Pasteur experimentally proved no spontaneous generation
Who was the first person to describe bateria
claims that life can originate from non-living matter
States that living cells come from pre-existing cells
Advantages to the small size of bacteria
- increased surface to volume ratio
- increased transport of materails
- faster growth rate
- faster reporduction
Prokaryote cell anatomy
- Cell membrane
- Cell wall has 2 arangements
- cell membrane w/ single cell wall - Gram Positive
- cell membrane w/ small of large or small cell wall and then a second wall called Gram Negative
What type of Prok. cell anatomy can our immune system detect?
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